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Descript .
Oregon Energy Efficiency Specialty Code
The following list provides more detailed descriptions of the requirements in Section 4 of the Mechanical Compliance
Certificate.
Requirements Specific To: RTU 1,2,3: .
1. [503.2.3] The specified heating and /or cooling equipment must meet the following minimum efficiency: Central Furnace (Gas): 80.00
% Et (or 78% AFUE)
2. [503.2.3] The specified heating and /or cooling equipment must meet the following minimum efficiency: Rooftop Package Unit: 11.00
EER (11.2 IEER)
3. [503.2.6] Energy recovery ventilation systems. Individual fan systems that have both a design supply air capacity of 5,000 cfm (2.36
m3 /s) or greater and a minimum outside air supply of 70 percent or greater of the design supply air quantity shall have an energy
recovery system that provides a change in the enthalpy of the outdoor air supply of 50 percent or more of the difference between the
outdoor air and return air at design conditions. Provision shall be made to bypass or control the energy recovery system to permit
cooling with outdoor air where cooling with outdoor air is required. Where a single room or space is supplied by multiple units, the
aggregate supply (cfm) of those units shall be used in applying this requirement.
Exception(s):
- Where energy recovery systems are prohibited by the International Mechanical Code.
- Systems serving spaces that are not cooled and are heated to less than 60 °F (15.5 °C).
- Where more than 60 percent of the outdoor heating energy is provided from site - recovered or site solar energy.
- Type 1 kitchen exhaust hoods.
- Cooling systems in climates with a 1- percent cooling design wet -bulb temperature less than 64F (18C).
- Systems requiring dehumidification that employ series -style energy recovery coils wrapped around the cooling coil when the
evaporative coil is located upstream of the exhaust air stream.
- Systems exhausting toxic, flammable, paint exhaust, corrosive fumes, or dust.
- Laboratory fume hood systems that include at least one of the following features:
1) Variable- air - volume hood exhaust and room supply systems that reduce exhaust and makeup air volume to 50 percent or less
of design values during periods of reduced occupancy or system demand
or
2) Variable- air - volume hood exhaust and room supply systems that reduce exhaust and makeup air volume and /or incorporate a
heat recovery system to precondition makeup air from laboratory exhaust shall meet the following:
A +B °(E/M) =50%
Where:
A = Percentage that the exhaust and makeup air flow rates will be reduced from design conditions.
B = Percentage sensible heat recovery effectiveness.
E = Exhaust airflow rate through the heat recovery device at design conditions
• M = Makeup air flow rate of the system at design conditions,
or
3) Direct makeup (auxiliary) air supply equal to at least 75 percent of the exhaust rate, heated no warmer than 2 °F (1.1°C) below
room setpoint, cooled to no cooler than 3 °F (1.7 °C) above room setpoint, no humidification added, and no simultaneous heating and
cooling used for dehumidification control.
4. [503.3.1] Supply air economizers shall be provided on each cooling system and shall be capable of providing 100 - percent outdoor air,
even if additional mechanical cooling is required to meet the cooling load of the building. Systems shall provide a means to relieve
excess outdoor air during economizer operation to prevent overpressurizing the building. The relief air outlet shall be located to avoid
recirculation into the building. Where a single room or space is supplied by multiple air systems, the aggregate capacity of those
systems shall be used in applying this requirement.
Exception(s): .
- Cooling equipment less than 54,000 Btu/hr. (15,827 W) total cooling capacity.
- Economizer cooling is not required for new cooling systems serving an existing dedicated computer server room, electronic
equipment room or telecom switch room in existing buildings up to a total of 600,000 Btu/hr (17,586 W) of new cooling equipment.
- Economizer cooling is not required for new cooling systems serving a new dedicated computer server room, electronic equipment
room or telecom switch room in existing buildings up to a total of 240,000 Btu /hr (70,344W) of new cooling equipment.
•
Project Title: Petco - Tigard, OR Report date: 12/15/11
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•
Requirements Specific To: RTU 4 :
•
1. [503.2.3] The specified heating and /or cooling equipment must meet the following minimum efficiency: Central Furnace (Gas): 80.00
% Et (or 78% AFUE)
2. [503.2.3] The specified heating and /or cooling equipment must meet the following minimum efficiency: Rooftop Package Unit: 11.00
EER (11.2 IEER)
3. [503.2.6] Energy recovery ventilation systems. Individual fan systems that have both a design supply air capacity of 5,000 cfm (2.36
m3 /s) or greater and a minimum outside air supply of 70 percent or greater of the design supply air quantity shall have an energy
recovery system that provides a change in the enthalpy of the outdoor air supply of 50 percent or more of the difference between the
outdoor air and return air at design conditions. Provision shall be made to bypass or control the energy recovery system to permit
cooling with outdoor air where cooling with outdoor air is required. Where a single room or space is supplied by multiple units, the
aggregate supply (cfm) of those units shall be used in applying this requirement.
Exception(s):
- Where energy recovery systems are prohibited by the International Mechanical Code.
- Systems serving spaces that are not cooled and are heated to less than 60 °F (15.5 °C).
- Where more than 60 percent of the outdoor heating energy is provided from site - recovered or site solar energy.
- Type 1 kitchen exhaust hoods.
- Cooling systems in climates with a 1- percent cooling design wet -bulb temperature less than 64F (18C).
. - Systems requiring dehumidification that employ series -style energy recovery coils wrapped around the cooling coil when the
evaporative coil is located upstream of the exhaust air stream.
- Systems exhausting toxic, flammable, paint exhaust, corrosive fumes, or dust.
- Laboratory fume hood systems that include at least one of the following features:
1) Variable- air - volume hood exhaust and room supply systems that reduce exhaust and makeup air volume to 50 percent or less
of design values during periods of reduced occupancy or system demand
or
2) Variable- air - volume hood exhaust and room supply systems that reduce exhaust and makeup air volume and /or incorporate a
heat recovery system to precondition makeup air from laboratory exhaust shall meet the following:
A + B °(E/M) = 50%
Where:
A = Percentage that the exhaust and makeup air flow rates will be reduced from design conditions.
B = Percentage sensible heat recovery effectiveness.
•
E = Exhaust airflow rate through the heat recovery device at design conditions
M = Makeup air flow rate of the system at design conditions,
or
3) Direct makeup (auxiliary) air supply equal to at least 75 percent of the exhaust rate, heated no warmer than 2 °F (1.1 °C) below
room setpoint, cooled to no cooler than 3 °F (1.7 °C) above room setpoint, no humidification added, and no simultaneous heating and
cooling used for dehumidification control.
4. [503.3.1] Supply air economizers shall be provided on each cooling system and shall be capable of providing 100 - percent outdoor air,
even if additional mechanical cooling is required to meet the cooling load of the building. Systems shall provide a means to relieve
excess outdoor air during economizer operation to prevent overpressurizing the building. The relief air outlet shall be located to avoid
recirculation into the building. Where a single room or space is supplied by multiple air systems, the aggregate capacity of those
systems shall be used in applying this requirement.
Exception(s):
- Cooling equipment less than 54,000 Btu/hr. (15,827 W) total cooling capacity.
- Economizer cooling is not required for new cooling systems serving an existing dedicated computer server room, electronic
equipment room or telecom switch room in existing buildings up to a total of 600,000 Btu/hr (17,586 W) of new cooling equipment.
- Economizer cooling is not required for new cooling systems serving a new dedicated computer server room, electronic equipment
room or telecom switch room in existing buildings up to a total of 240,000 Btu/hr (70,344W) of new cooling equipment.
Requirements Specific To: ACC /AHU -1 :
1. [503.2.3] The specified heating and /or cooling equipment must meet the following minimum efficiency: Split System: 13.00 SEER
2. [503.2.6] Energy recovery ventilation systems. Individual fan systems that have both a design supply air capacity of 5,000 cfm (2.36
m3 /s) or greater and a minimum outside air supply of 70 percent or greater of the design supply air quantity shall have an energy
recovery system that provides a change in the enthalpy of the outdoor air supply of 50 percent or more of the difference between the
outdoor air and return air at design conditions. Provision shall be made to bypass or control the energy recovery system to permit
cooling with outdoor air where cooling with outdoor air is required. Where a single room or space is supplied by multiple units, the
aggregate supply (cfm) of those units shall be used in applying this requirement.
Exception(s):
- Where energy recovery systems are prohibited by the International Mechanical Code.
- Systems serving spaces that are not cooled and are heated to less than 60 °F (15.5 °C).
Project Title: Petco - Tigard, OR Report date: 12/15/11
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•
- Where more than 60 percent of the outdoor heating energy is provided from site - recovered or site solar energy.
Type 1 kitchen exhaust hoods.
- Cooling systems in climates with a 1- percent cooling design wet -bulb temperature less than 64F (18C).
- Systems requiring dehumidification that employ series -style energy recovery coils wrapped around the cooling coil when the
evaporative coil is located upstream of the exhaust air stream.
- Systems exhausting toxic, flammable, paint exhaust, corrosive fumes, or dust.
- Laboratory fume hood systems that include at least one of the following features:
1) Variable- air - volume hood exhaust and room supply systems that reduce exhaust and makeup air volume to 50 percent or less
of design values during periods of reduced occupancy or system demand
or
2) Variable- air - volume hood exhaust and room supply systems that reduce exhaust and makeup air volume and /or incorporate a
heat recovery system to precondition makeup air from laboratory exhaust shall meet the following:
A + B•(E/M) = 50%
Where:
A = Percentage that the exhaust and makeup air flow rates will be reduced from design conditions.
B = Percentage sensible heat recovery effectiveness.
E = Exhaust airflow rate through the heat recovery device at design conditions
M = Makeup air flow rate of the system at design conditions,
or
3) Direct makeup (auxiliary) air supply equal to at least 75 percent of the exhaust rate, heated no warmer than 2 °F (1.1 °C) below
room setpoint, cooled to no cooler than 3 °F (1.7 °C) above room setpoint, no humidification added, and no simultaneous heating and
cooling used for dehumidification control.
Requirements Specific To: CUH -1 :
1. [503.2.6] Energy recovery ventilation systems. Individual fan systems that have both a design supply air capacity of 5,000 cfm (2.36
m3 /s) or greater and a minimum outside air supply of 70 percent or greater of the design supply air quantity shall have an energy
recovery system that provides a change in the enthalpy of the outdoor air supply of 50 percent or more of the difference between the
outdoor air and return air at design conditions. Provision shall be made to bypass or control the energy recovery system to permit
cooling with outdoor air where cooling with outdoor air is required. Where a single room or space is supplied by multiple units, the
aggregate supply (cfm) of those units shall be used in applying this requirement.
Exception(s):
• - Where energy recovery systems are prohibited by the International Mechanical Code.
- Systems serving spaces that are not cooled and are heated to less than 60 °F (15.5 °C).
- Where more than 60 percent of the outdoor heating energy is provided from site - recovered or site solar energy.
- Type 1 kitchen exhaust hoods.
- Cooling systems in climates with a 1- percent cooling design wet -bulb temperature less than 64F (18C).
- Systems requiring dehumidification that employ series -style energy recovery coils wrapped around the cooling coil when the
• evaporative coil is located upstream of the exhaust air stream.
- Systems exhausting toxic, flammable, paint exhaust, corrosive fumes, or dust.
- Laboratory fume hood systems that include at least one of the following features:
1) Variable -air- volume hood exhaust and room supply systems that reduce exhaust and makeup air volume to 50 percent or less
of design values during periods of reduced occupancy or system demand
or
2) Variable- air - volume hood exhaust and room supply systems that reduce exhaust and makeup air volume and /or incorporate a
heat recovery system to precondition makeup air from laboratory exhaust shall meet the following:
A + B'(E/M) = 50%
-Where:
A = Percentage that the exhaust and makeup air flow rates will be reduced from design conditions.
B = Percentage sensible heat recovery effectiveness.
E = Exhaust airflow rate through the heat recovery device at design conditions
M = Makeup air flow rate of the system at design conditions,
or
3) Direct makeup (auxiliary) air supply equal to at least 75 percent of the exhaust rate, heated no warmer than 2 °F (1.1°C) below
room setpoint, cooled to no cooler than 3 °F (1.7 °C) above room setpoint, no humidification added, and no simultaneous heating and
cooling used for dehumidification control.
Requirements Specific To: CUH -2 :
1. [503.2.6] Energy recovery ventilation systems. Individual fan systems that have' both a design supply air capacity of 5,000 cfm (2.36
m3 /s) or greater and a minimum outside air supply of 70 percent or greater of the design supply air quantity shall have an energy
recovery system that provides a change in the enthalpy of the outdoor air supply of 50 percent or more of the difference between the
Project Title: Petco - Tigard, OR Report date: 12/15/11
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outdoor air and return air at design conditions. Provision shall be made to bypass or control the energy recovery system to permit
cooling with outdoor air where cooling with outdoor air is required. Where a single room or space is supplied by multiple units, the
aggregate supply (cfm) of those units shall be used in applying this requirement.
Exception(s):
- Where energy recovery systems are prohibited by the International Mechanical Code.
- Systems serving spaces that are not cooled and are heated to less than 60 °F (15.5 °C).
- Where more than 60 percent of the outdoor heating energy is provided from site - recovered or site solar energy.
- Type 1 kitchen exhaust hoods.
- Cooling systems in climates with a 1- percent cooling design wet -bulb temperature less than 64F (18C).
- Systems requiring dehumidification that employ series -style energy recovery coils wrapped around the cooling coil when the
evaporative coil is located upstream of the exhaust air stream.
- Systems exhausting toxic, flammable, paint exhaust, corrosive fumes, or dust.
- Laboratory fume hood systems that include at least one of the following features:
1) Variable- air - volume hood exhaust and room supply systems that reduce exhaust and makeup air volume to 50 percent or less
of design values during periods of reduced occupancy or system demand
or
2) Variable- air - volume hood exhaust and room supply systems that reduce exhaust and makeup air volume and /or incorporate a
heat recovery system to precondition makeup air from laboratory exhaust shall meet the following:
A + B°(EN) = 50%
Where:
A = Percentage that the exhaust and makeup air flow rates will be reduced from design conditions.
B = Percentage sensible heat recovery effectiveness.
E = Exhaust airflow rate through the heat recovery device at design conditions
M = Makeup air flow rate of the system at design conditions,
or •
3) Direct makeup (auxiliary) air supply equal to at least 75 percent of the exhaust rate, heated no warmer than 2 °F (1.1°C) below
room setpoint, cooled to no cooler than 3 °F (1.7 °C) above room setpoint, no humidification added, and no simultaneous heating and
cooling used for dehumidification control.
Requirements Specific To: GUH -1 :
1. [503.2.3] The specified heating and /or cooling equipment must meet the following minimum efficiency: Unit Heater (Gas): 80.00 %
Ec
2. [503.2.6] Energy recovery ventilation systems. Individual fan systems that have both a design supply air capacity of 5,000 cfm (2.36
m3 /s) or greater and a minimum outside air supply of 70 percent or greater of the design supply air quantity shall have an energy
recovery system that provides a change in the enthalpy of the outdoor air supply of 50 percent or more of the difference between the •
outdoor air and return air at design conditions. Provision shall be made to bypass or control the energy recovery system to permit
cooling with outdoor air where cooling with outdoor air is required. Where a single room or space is supplied by multiple units, the
aggregate supply (cfm) of those units shall be used in applying this requirement.
Exception(s):
- Where energy recovery systems are prohibited by the International Mechanical Code.
- Systems serving spaces that are not cooled and are heated to less than 60 °F (15.5 °C).
- Where more than 60 percent of the outdoor heating energy is provided from site - recovered or site solar energy.
- Type 1 kitchen exhaust hoods.
- Cooling systems in climates with a 1- percent cooling design wet -bulb temperature less than 64F (18C).
- Systems requiring dehumidification that employ series -style energy recovery coils wrapped around the cooling coil when the
evaporative coil is located upstream of the exhaust air stream.
- Systems exhausting toxic, flammable, paint exhaust, corrosive fumes, or dust.
- Laboratory fume hood systems that include at least one of the following features:
1) Variable- air - volume hood exhaust and room supply systems that reduce exhaust and makeup air volume to 50 percent or less
of design values during periods of reduced occupancy or system demand
or
2) Variable- air - volume hood exhaust and room supply systems that reduce exhaust and makeup air volume and /or incorporate a
heat recovery system to precondition makeup air from laboratory exhaust shall meet the following:
A + B *(E/M) = 50%
Where:
A = Percentage that the exhaust and makeup air flow rates will be reduced from design conditions.
B = Percentage sensible heat recovery effectiveness.
E = Exhaust airflow rate through the heat recovery device at design conditions -
M = Makeup air flow rate of the system at design conditions,
or
•
Project Title: Petco - Tigard, OR - Report date: 12/15/11
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3) Direct makeup (auxiliary) air supply equal to at least 75 percent of the exhaust rate, heated no warmer than 2 °F (1.1°C) below
room setpoint, cooled to no cooler than 3 °F (1.7 °C) above room setpoint, no humidification added, and no simultaneous heating and
cooling used for dehumidification control.
•
Requirements Specific To: Water Heater 1 :
1. [504.2] Service water heating equipment meets minimum efficiency requirements. Gas Storage Water Heater efficiency: 0.56 EF
2. [504.2] Service water- heating equipment performance efficiency. Water heating equipment efficiency shall be verified through data
furnished by the manufacturer or through certification under an approved certification program.
3. [504.3] Temperature controls. Service water - heating equipment shall be provided with controls to allow a setpoint of 110 °F (43 °C) for
equipment serving dwelling units and 90 °F (32 °C) for equipment serving other occupancies. The outlet temperature of lavatories in
public facility rest rooms shall be limited to 110 °F (43 ° C).
4. [504.4] Heat traps. Water- heating equipment not supplied with integral heat traps and serving noncirculating systems shall be provided
with heat traps on the supply and discharge piping associated with the equipment.
5. [504.5] Pipe Insulation. For automatic - circulating hot water and externally heated (such as heat trace or impedance heating) systems,
piping shall be insulated with 1 inch (25 mm) of insulation having a conductivity not exceeding 0.27 Btu per inch/h ft2 x °F (1.53 W per
25 mm/m2 x K). The first 8 feet (2438 mm) of piping in noncirculating systems served by equipment without integral heat traps shall be
insulated with 0.5 inch (12.7 mm) of material having a conductivity not exceeding 0.27 Btu per inch/h x ft2 x °F (1.53 W per 25 mm/m2
x K). -
6. [504.6] Hot Water System Controls. Systems designed to maintain usage temperatures in hot water pipes such as hot water
recirculating systems or heat trace, shall be turned off automatically when the hot water system is not in operational and shall have
demand sensing controls (flow switch in cold water make -up pipe, retum water aquastat temperature sensor) that turn off the system
when there is no demand when the system is operational. A check valve or similar device shall be located between the circulator pump
and the water heating equipment to prevent water from flowing backwards though the recirculation loop.
Exception(s):
- Where public health. standards require 24 hours per day operation of pumps for uses such as swimming pools, spas and hospitals.
- Service water heating systems used to provide multiple functions (e.g., space heating and DHW) as part of an integrated system.
- Where coupled with water heating capacity less than 100 kBtu /h (29 kW).
Generic Requirements: Must be met by all systems to which the requirement is applicable:
1. [503.2.1] Calculation of heating and cooling loads. Design loads shall be determined in accordance with the procedures described in
the ASHRAE/ACCA Standard 183. Heating and cooling loads shall be adjusted to account for load reductions that are achieved when
energy recovery systems are utilized in the HVAC system in accordance with the ASHRAE HVAC Systems and Equipment Handbook.
Alternatively, design loads shall be determined by an approved equivalent computation procedure.
2. 1503.2.1.1] Packaged Electric Equipment. Forced air unit or packaged electric equipment with a total heating capacity greater than
20,000 Btu/h has a heat pump as the primary heating source.
Exception(s):
•
- Unstaffed equipment shelters or cabinets used solely for personal wireless service facilities.
- Requirement is not applicable.
3. [503.3.1] Cooling equipment economizers: The total capacity of all units without economizers shall not exceed 240 kBtu/hr per building
area served by one utility meter or service, or 10 percent of its total installed cooling capacity, whichever is greater. For this project the
total capacity of all cooling equipment without economizers must be less than 240 kBtu/h. This project lists 9 kBtu/h capacity without
economizers. That portion of the equipment serving dwelling units and guest rooms is not included in determining the total capacity of
units without economizers.
4. [503.2.2] Equipment and system sizing. Heating and cooling equipment and systems capacity shall not exceed the loads calculated
in accordance with Section 503.2.1. A single piece of equipment providing both heating and cooling must satisfy this provision for one
function with the capacity for the other function as small as possible, within available equipment options.
• Exception(s):
- Required standby equipment and systems provided with controls and devices that allow such systems or equipment to operate
automatically only when the primary equipment is not operating.
- Multiple units of the same equipment type with combined capacities exceeding the design load and provided with controls that have
the capability to sequence the operation of each unit based on load.
5. [503.2.3] HVAC Equipment Performance Requirements. Reported efficiencies must be tested and rated in accordance with the
applicable test procedure. The efficiency shall be verified through certification under an approved certification program or, if no
•
Project Title: Petco - Tigard, OR Report date: 12/15/11
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° certification program exists, the equipment efficiency ratings shall be supported by data furnished by the manufacturer. Where multiple
rating conditions or performance requirements are provided, the equipment shall satisfy all stated requirements. Where components,
such as indoor or outdoor coils, from different manufacturers are used, calculations and supporting data shall be furnished by the
• designer that demonstrates that the combined efficiency of the specified components meets the requirements herein.
6. [503.2.4.1] Thermostatic Controls. The supply of heating and 'cooling energy to each zone shall be controlled by individual. thermostatic
controls that respond to temperature within the zone.
7. [503.2.4.1.1] Heat pump supplementary heat. Heat pumps having supplementary electric resistance heat shall have controls that,
except during defrost, prevent supplementary heat operation when the heat pump can meet the heating load.
8. [503.2.4.2] Set point overlap restriction. Where used to control both heating and cooling, zone thermostatic controls shall provide a
temperature range or deadband of at least 5 °F (2.8 °C) within which the supply of heating and cooling energy to the zone is capable of
• being shut off or reduced to a minimum.
Exception(s):
- Thermostats requiring manual change over between heating and cooling modes.
9. [503.2.4.3] Optimum Start Controls. Each HVAC system shall have controls that vary the start-up time of the system to just meet the
temperature set point at time of occupancy.
10. [503.2.4.4] Off -hour controls. Each zone shall be provided with thermostatic setback controls that are controlled by either an automatic
time clock or programmable control system. Thermostatic setback controls shall have the capability to set back or temporarily operate
the system to maintain zone temperatures down to 55 °F (13 °C) or up to 85 °F (29 °C). Automatic time clock or programmable controls
shall be capable of starting and stopping the system for seven different daily schedules per week and retaining their programming and
time setting during a loss of power for at least 10 hours. Additionally, the controls shall have a manual override that allows temporary
operation of the system for up to 2 hours; a manually operated timer capable of being adjusted to operate the system for up to 2 hours;
or an occupancy sensor.
Exception(s):
- Zones that will be operated continuously.
- Zones with a full HVAC load demand not exceeding 6,800 Btu/h (2 kW) and having a readily accessible manual shutoff switch.
11. [503.2.4.5] Shutoff damper controls. Both outdoor air supply and exhaust shall be equipped with not less than Class I motorized
dampers with a maximum leakage rate of 4 cfm per square foot (6.8 Us - C m2) at 1.0 inch water gauge (w.g.) (1250 Pa) when tested
in accordance with AMCA 500D, that will automatically shut when the systems or spaces served are not in use.
Exception(s):
- Gravity dampers shall be permitted for outside air intake or exhaust airflows of 300 cfm (0.14 m3 /s) or less.
12. [503.2.4.6] Freeze Protection and Snow melt system controls. Freeze protection systems, such as heat tracing of outdoor piping and
heat exchangers, including self - regulating heat tracing, shall include automatic controls capable of shutting off the systems when
outdoor air temperatures are above 40F or when the conditions of the protected fluid will prevent freezing. Snow- and Ice- melting
systems, supplied through energy service to the building, shall include automatic controls capable of shutting off the system when the
pavement temperature is above 50F (10C) and no precipitation is falling and an automatic or manual control that will allow shutoff when
. the outdoor temperature is above 40F (4C) so that the potential for snow or ice accumulation is negligible.
13. [503.2.4.8] Separate air distribution systems. Zones with special process temperature requirements and /or humidity requirements
shall be served by separate air distribution systems from those serving zones requiring only comfort conditions; or shall include
supplementary control provisions so that the primary systems may be specifically controlled for comfort purposes only.
Exception(s):
- Zones requiring only comfort heating or comfort cooling that are served by a system primarily used for process temperature and
humidity control provided that:
• 1) The total supply air to those comfort zones is no more than 25 percent of the total system supply air,
or
2) The total conditioned floor area.of the zones is less than 1,000 square feet (90 m2)
14. [503.2.4.9] Humidity control. If a system is equipped with a means to add or remove moisture to maintain specific humidity levels in a
zone or zones, a humidity control device shall be provided.
15. [503.2.4.9.1] Humidity control. Where a humidity control device exists it shall be set to prevent the use of fossil fuel or electricity to
produce relative humidity in excess of 30 percent. Where a humidity control device is used for dehumidification, it shall be set to
prevent the use of fossil fuel or electricity to reduce relative humidity below 60 percent.
Exception(s):
- Hospitals, process needs, archives, museums, critical equipment, and other non - comfort situations with specific humidity
requirements outside this range.
Project Title: Petco - Tigard, OR Report date: 12/15/11
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16. [503.2.4.9.2] Humidity control. Where a humidity control device exists it shall be set to maintain a deadband of at least 10% relative
humidity where no active humidification or dehumidification takes place.
Exception(s):
•
- Heating for dehumidification is provided with heat recovery or heat pumping and the mechanical.cooling system efficiency is 10
• percent higher than required in section 503.2.3, HVAC equipment performance requirements.
17. [503.2.5] Ventilation. Ventilation, either natural or mechanical, shall be provided in accordance with Chapter 4 of the International
Mechanical Code. Where mechanical ventilation is provided, the system shall provide the capability to reduce the outdoor air supply to
the minimum required by Chapter 4 of the International Mechanical Code.
18. [503.2.5.1] Demand controlled ventilation (DCV). DCV is required for spaces larger than 500 ft2 for simple systems and spaces
larger than 150 ft2 for multiple zone systems and with an average occupant load of 25 people or more per 1000 ft2 of floor area (as
established in Table 403.3 of the International Mechanical Code) and served by systems with one or more of the following:
1. An air -side economizer;
2. Automatic modulating control of the outdoor air damper; or
3. A design outdoor airflow greater than 3,000 cfm.
Exception(s):
- Systems with energy recovery complying with Section 503.2.6
. - Spaces less than 750 ft2 (69.7 m2) where an occupancy sensor turns the fan off, closes the ventilation damper, or closes the zone
damper when the space is unoccupied.
19. [503.2.5.2] Kitchen hoods. Kitchen makeup air shall be provided as required by the Oregon Mechanical Specialty Code. For each
kitchen with a total exhaust capacity greater than 5,000 cfm (2360 Us), 50 percent of the required makeup air shall be (a) unheated or
heated to no more than 60 °F (15.55 °C); and (b) uncooled or evaporatively cooled. Each kitchen with a total exhaust capacity greater
than 5,000 cfm shall be equipped with a demand ventilation system on at least 75 percent of the exhaust and makeup air. Such
systems shall be equipped with automatic controls that reduce airflow in response to cooking appliance operation.
Exception(s):
- Where hoods are used to exhaust ventilation air that would otherwise be exhausted by other fan systems. Air transferred from
spaces served by other fan systems may not be used if those systems are required to meet either Sections 503.2.5.1 or 503.2.6.
Occupancy schedule of HVAC system supplying transfer air shall be similar to kitchen exhaust hood operating schedule.
- Kitchen exhaust systems that include exhaust air energy recovery complying with section 503.2.6.
20. [503.2.5.3] Enclosed parking garage ventilation controls. In Group S -2, enclosed parking garages used for storing or handling
automobiles operating under their own power having ventilation exhaust rates 30,000 cfm and greater shall employ automatic carbon
monoxide sensing devices. These devices shall modulate the ventilation system to maintain a maximum average concentration of
carbon monoxide of 50 parts per million during any 8 -hour period, with a maximum concentration not greater than 200 parts per million
for a period not exceeding 1 hour. The.system shall be capable of producing a ventilation rate of 1.5 cfm per square foot (0.0076 m3 /s -
m2) of floor area. Failure of such devices shall cause the exhaust fans to operate in the ON position.
21. [503.2.7] Duct and plenum insulation and sealing. All supply and return air ducts and plenums shall be insulated with a minimum of R -5
insulation when located in unconditioned spaces and a minimum of R -8 insulation when located outside the building. When located
within a building envelope assembly, the duct or plenum shall be separated from the building exterior or unconditioned or exempt
spaces by a minimum of R-8 insulation. All ducts, air handlers and filter boxes shall be sealed. Joints and seams shall comply with
Section 603.9 of the International Mechanical Code.
Exception(s):
- When located within equipment.
• - When the design temperature difference between the interior and exterior of the duct or plenum does not exceed 15 °F (8 °C).
22. [503.2.7.1.1] Low - pressure duct systems. All longitudinal and transverse joints, seams and connections of supply and return ducts
operating at a static pressure less than or equal to 2 inches w.g. (500 Pa) shall be securely fastened and sealed with welds, gaskets,
mastics (adhesives), mastic -plus- embedded -fabric systems or tapes installed in accordance with the manufacturer's installation
instructions. Pressure classifications specific to the duct system shall be clearly indicated on the construction documents in accordance
with the International Mechanical Code. Documentation shall be furnished by the designer demonstrating that representative sections
totaling at least 25 percent of the duct area have been tested and that all tested sections meet the requirements of this section.
Exception(s):
- Continuously welded and locking -type longitudinal joints and seams on ducts operating at static pressures less than 2 inches w.g.
(500 Pa) pressure classification.
23. [503.2.7.1.2] Medium - pressure duct systems. All ducts and plenums designed to operate at a static pressure greater than 2 inches
w.g. (500 Pa) but less than 3 inches w.g. (750 Pa) shall be insulated and sealed in accordance with Section 503.2.7. Pressure
classifications specific to the duct system shall be clearly indicated on the construction documents in accordance with the International
Mechanical Code. Documentation shall be furnished by the designer demonstrating that representative sections totaling at least 25
percent of the duct area have been tested and that all tested sections meet the requirements of this section.
Project Title: Petco - Tigard, OR Report date: 12/15/11
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• 24. 503.2.7.1.3 High-pressure duct systems. Ducts designed to operate at static pressures in excess of 3 inches w. (746 Pa
[ 1 h 9� Y 9 P P 9•( Pa) shall be
insulated and sealed in accordance with Section 503.2.7. In addition, ducts and plenums shall be leak- tested in accordance with the -
SMACNA HVAC Air Duct Leakage Test Manual with the rate of air leakage (CL) less than or equal to 6.0 as determined in accordance
•
with Equation 5-2. Documentation shall be furnished by the designer demonstrating that representative sections totaling at least 25
percent of the duct area have been tested and that all tested sections meet the requirements of this section.
CL = F x P ^(0.65) (Equation 5-2)
where:
F = The measured leakage rate in cfm per 100 square feet of duct surface.
P = The static pressure of the test.
25. [503.2.8] Piping Insulation. All pipes serving space - conditioning systems must be insulated as follows:
Hot water piping for heating systems:
1.5 in. for pipes <= 1.5 in. nominal diameter,
2 in. for pipes > 1.5 in. nominal diameter.
Chilled water, refrigerant, and brine piping systems:
1.5 in. insulation for pipes <= 1.5 in. nominal diameter,
1.5 in. insulation for pipes > 1.5 in. nominal diameter.
Steam piping:
1.5 in. insulation for pipes <= 1.5 in. nominal diameter,
3 in. insulation for pipes > 1.5 in. nominal diameter.
Exception(s):
- Pipe insulation is not required for factory- installed piping within HVAC equipment.
- Pipe insulation is not required for piping that conveys fluids having a design operating temperature range between 60 °F and 105 °F.
- Pipe insulation is not required for runout piping not exceeding 4 ft in length and 1 in. in diameter between the control valve and HVAC
coil.
26. [503.2.9.1] Air system balancing. Each supply air outlet and zone terminal device shall be equipped with means for air balancing in
accordance with the requirements of Chapter 6 of the International Mechanical Code (IMC 603.17). Discharge dampers intended to
modulate airflow are prohibited on constant volume fans and variable volume fans with motors 10 horsepower (hp) (7.5 kW) and larger.
27. [503.2.9.2] Hydronic system balancing. Individual hydronic heating and cooling coils shall be equipped with means for balancing and
pressure test connections.
28. [503.2.9.3] Manuals. The construction documents shall require that an operating and maintenance manual be provided to the building
owner by the mechanical contractor. The manual shall include, at least, the following:
1. Equipment capacity (input and output) and required maintenance actions.
2. Equipment operation and maintenance manuals.
3. HVAC system control maintenance and calibration information, including wiring diagrams, schematics, and control sequence
descriptions. Desired or field - determined setpoints shall be permanently recorded on control drawings, at control devices or, for digital
control systems, in programming comments.
4. A complete written narrative of how each system is intended to operate.
29. [503.2.10] Air System Design and Control. Each HVAC system having a total fan system motor nameplate horsepower (hp) exceeding
5 horsepower (hp) (3.7 kW) shall meet the provisions of Sections 503.2.10.1 through 503.2.10.2.
30. [503.2.10.1] Allowable fan floor horsepower. Each HVAC system at fan system design conditions shall not exceed the allowable fan
system motor nameplate hp (Option 1) or fan system bhp (Option 2) as shown in Table 503.2.10.1(1). This includes supply fans, retum/
relief fans, and fan - powered terminal units associated with systems providing heating or cooling capability.
Table 503.2.10.1(1)
Fan Power Limitation LIMIT CONSTANT VOLUME VARIABLE VOLUME
Option 1: Fan system motor nameplate hp Allowable nameplate motor hp hp < CFMS '110011 hp < CFMS *0.0015
Option 2: Fan system bhp Allowable fan system bhp bhp < CFMS *0.00094 + A bhp < CFMS *0.0013 +
A
where:
CFMS = The maximum design supply airflow rate to conditioned spaces served by the system in cubic feet per minute.
hp = The maximum combined motor nameplate horsepower.
Bhp = The maximum combined fan brake horsepower.
A= Sum of [PD x CFMD 14131].
where:
PD = Each applicable pressure drop adjustment from Table 503.2.10.1(2) in. w.c.
Project Title: Petco - Tigard, OR Report date: 12/15/11
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• Table 503.2.10.1(2)
Fan Power Limitation Pressure Drop Adjustment Credits:
Fully ducted return and /or exhaust air systems = 0.5 in w.c.
Return and /or exhaust airflow control devices = 0.5 in w.c
Exhaust filters, scrubbers or other exhaust treatment = pressure drop of device calculated at fan system design condition.
Particulate filtration credit: MERV 9 thru 12 = 0.5 in w.c.
Particulate filtration credit: MERV 13 thru 15 = 0.9 in w.c.
Particulate filtration credit: MERV 16 and greater and electronically
Enhanced filters = Pressure drop calculated at 2x clean filter pressure drop at fan system design condition.
Carbon and other gas -phase air cleaners = Clean filter pressure drop at fan system design condition.
• Heat recovery device = Pressure drop of device at fan system design condition.
Evaporative humidifier /cooler in series with another cooling coil = Pressure drop of device at fan system design conditions
Sound attenuation section = 0.15 in w.c.
Exhaust system serving fume hoods = 0.35 in. w.c.
Laboratory and vivarium exhaust systems in high -rise buildings = 0.25 in. w.c. /100 ft of vertical duct exceeding 75 feet
Exception(s):
- Hospital and laboratory systems that utilize flow control devices on exhaust and /or return to maintain space pressure relationships
necessary for occupant health and safety or environmental control shall be permitted to use variable volume fan power limitation.
- Individual exhaust fans with motor nameplate horsepower of 1 hp (0.7 kW) or less.
31. [503.2.10.2] Motor nameplate horsepower. For each fan, the selected fan motor shall be no larger than the first available motor size
greater than the brake horsepower (bhp). The fan brake horsepower (bhp) shall be indicated on the design documents to allow for
compliance verification by the code official.
Exception(s):
- For fans less than 6 bhp, where the first available motor larger than the brake horsepower has a nameplate rating within 50 percent
of the bhp, selection of the next larger nameplate motor size is allowed.
- For fans 6 bhp and larger, where the first available motor larger than the bhp has a nameplate rating within 30 percent of the bhp,
selection of the next larger nameplate motor size is allowed.
32. [503.2.10.3.1] Large Volume Fan Systems. Fan systems over 8,000 (7 m3 /s) cfm without direct expansion cooling coils that serve
single zones are required to reduce airflow based on space thermostat heating and cooling demand. A two -speed motor or variable
frequency drive shall reduce airflow to a maximum 60 percent of peak airflow or minimum ventilation air requirement as required by
Chapter 4 of the International Mechanical Code, whichever is greater.
Exception(s):
- Systems where the function of the supply air is for purposes other than temperature control, such as maintaining specific humidity
levels or supplying an exhaust system
33. [503.2.10.4] Series fan - powered terminal unit fan motors. Fan motors for series fan - powered terminal units shall be
electronically- commutated motors and have a minimum motor efficiency of 70 percent when rated in accordance with NEMA Standard
MG 1 -2006 at full load rating conditions. •
34. [503.2.11] Heating outside a building. Systems installed to provide heat outside a building shall be radiant systems. Such heating
systems shall be controlled by an occupancy sensing device or a timer switch, so that the system is automatically deenergized when
no occupants are present.
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35. [503.2.12] Hot Gas Bypass Limitation. For cooling systems <= 240 kBtu/h, maximum hot gas bypass capacity must be no more than
50% total cooling capacity.
36. All service water heating requirements are listed in requirements section specific to the system. •
Project Title: Petco - Tigard, OR Report date: 12/15/11
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