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Specifications
ic I .0 ( /f -© a 7 45 s t4✓ HA-A PM/V Sr pia - -- .— > ''- t � � SM P R O DUC T (3 5 T UNIT ,ip%k s , s� : HORIZONTAL & ECONOMIZE�2 ACCESSORY; — o i � = "�%u I i INCLUDING 3 TON 14 SEER HP AND I DUAL F MODELS Installation Instructions ECH -SDLGS and ECH-SDLGB Read these instructions completely before attempting install to instal the ' ' "' v 1 €CAYT�'I�N ' Horizontal Economizer Accessory'` �� CONTENTS t NIE PERFORM&NCEAND COMPOyEN'I HA Failure to follow this caution may result in unit damage. SAFETY CONSIDERATIONS 1 GENERAL 1,2 For cooling operation, the recommended airflow is 350 to 450 cfm ACCESSORIES LIST ') for each 12,000 Btuli of rated cooling capacity. For heating opera- tion. the airflow must produce a temperature rise that falls within the INSTALLATION 2-6 range stamped on the unit rating plate. CONFIGURATION 6 -10 GENERAL ECONOMIZER CONTROL MODES 6 Economizers are recommended for use with only commercial packaged OPERATION 10 products that have X13 high static motors. The Economizer system SEQUENCE OF OPERATION 10 utilizes the latest technology available for integrating the use of free cooling with mechanical cooling for rooftop units. The solid state control PERFORMANCE DATA 11 system optimizes energy consumption zone comfort. and equipment TROUBLESHOOTING 11 -12 cycling by operating the compressors when the outdoor -air temperature WIRING DIAGRAMS 1 3 -14 is too warm. integrating the compressor with outdoor air when free cooling is available, and locking out the compressor when outdoor -air temperature is too cold. Demand ventilation is supported. SAFETY CONSIDERATIONS Installation and servicing of air- conditioning equipment can be The Economizer system utilizes gear -drive technology with a direct - hazardous due to system pressure and electrical components. Only mount spring return actuator that will close upon loss of power. The trained and qualified service personnel should install, repair. or service Economizer system with controls comes standard with an outdoor air air - conditioning equipment. sensor, a supply air temperature sensor, and low temperature compressor lockout. switch. Return -air temperature, indoor enthalpy. and outdoor Untrained personnel can perform the basic maintenance functions of enthalpy sensors are available for field installation. Field - installed CO- replacing filters. All other operations should be performed by trained sensors are available. service personnel. When working on air - conditioning equipment. observe See Table 1 for package contents. See Table 2 for sensor usage. precautions in the literature. tags. and labels attached to the unit, and other safety precautions that may apply. Table 1 - Filter Sizes Economizer PN Filter OTY and Sizes Recognize safety inforrmation. 1 his is the safety-alert symbol ,' t `. (1) 14 x 24 (355.6 x 609.6mm) E CH -SDLGB When you see this symbol on the unit and in instructions or manuals. be 1) 16 x 24 (406.4 x 609.6mm) alert to the potential for personal injuryt Understand these signal words; (1) 16 x 24 (406.4 x 609.6mm) ECH -SDLGB (1) 18 x 24 (457.2 x 609.6mm) DANGER, WARNING and CAUTION. These words are used with the safety -alert symbol. DANGER identifies the most serious hazards which Package Contents will result in severe personal injury or death. WARNING signifies haz ppRT NUMBER QTY DESCRIPTIONS ards which could result in personal injury or death. CAUTION is used to identify• unsafe practices which may result in minor personal injury or 1 Hood Top and Sides product and property damage. NOTE is used to highlight suggestions I Aluminum Filter which will result in enhanced installation, reliability. operation. 11 #10 Self - Drilling Screw and Washers 4 #10 x 112" Blunt End Screws Folk \,. all safety codes. Wear safety glasses and work gloves. Have a 2 #10 x 1" Self- Drilling Screws fire extinguisher available. 1 Economizer Assembly 1 Supply Air Temperature Sensor with Bracket SDLGB ECH - �T m) Throw Away Filters �'r .. n 5, � .. IN .': � » g 2 1" (25. J.. 't s. a; ECH-SDLGB -, 1 Top Filter Rack ELECtRICAL SHOCK HAZARD Bottom Filter Rack Failure to follow this warning could result in personal injure' or death. Replacement Return Chamber Panel 1 Compressor Cover Panel Disconnect power supply and install lockout tag before attempting to Extension Harness w; Plug install accessory. 2 Wiring Diagram Labels 1 Installation Instruction NOT SAI sensor. harness. actuator wiring labels not included with economizer with no controls: CC D- SDLCG * -NC -CD S Top filter rack Table 2 - Economizer Sensor Usage ECONOMIZER WITH OUTDOOR AIR APPLICATION �' Evaporator Coil DRY BULB SENSOR Outdoor Air Included in ECH - SDLG "- ADB -CD Dry Bulb Iv` Ma Differential Dry Bulb 9901 -0251 Required Single Included in ECH- SDLG*- ENT -CD "`C Enthalpy �= Differential 9901 -0018 Required Enthalpy Bottom filter rack ACCESSORIES LIST Fig. IA- Filter Rack Installation (Bent Coil): The economizer has several field - installed accessories available to ECI{ -SDLGB optimize performance. Refer to fable 3 for authorized parts. Table 3 - Economizer Field - Installed Accessories Top filter rack DESCRIPTION PART NUMBER Return Air Temperature Sensor 9901 - 0251 °\ Indoor Air Enthalpy Sensor 9901 -0018 Evaporator Heat Pump Relay Package CPRLYKIT001A00 • /Coil NOTE: CPRLYkiT001 A00 is available from I -1VAC manufacturer i INSTALLATION Economizer - See Fig. 2 for Economizer component locations. To install the horizontal Economizer pertbrm the following procedure: Bottom filter rack i . Turn off unit power supply and install lockout tag. /ry Fig. 1B - Filter Ra 4JC Installation (Straight Coil): WiA�RNT � ,. CA1y�DI✓'V ELECTRICAL. SHOCK HAZARD L Failure to follow this warning could result in personal injury or death. Before installing or servicing system, always turn off main power to system and tag. "There may be more than one disconnect switch. 6. Most new Phase NVAC units will have an economizer plug in the Turn off accessory heater power switch if applicable. return air chamber, which runs back to the control box. If the unit has the economizer harness i plug_ first remove the juniper plug from the end of the harness to allow the plug from the economizer 2. Remove the compressor access panel and unit side panel. to be connected. See Fig. 3. NOTE: The jumper plug should he saved for future use in the event that the economizer is removed from the unit. The jumper 3. Remove the return air duct cover to aid in the installation. plug is not needed as long as the economizer is installed. In the event that your I -1VAC unit does not have a factory installed 4. Install the top filter rack in the I1VAC unit next to the indoor coil. harness for the economizer, the extension harness shipped with Lift rack to the very top of the chamber. and screw into both the the economizer must. be installed in the unit. Route the extension left and right side of the coil FRAME, using #1(1 x 1i2" Blunt harness through the 1-1VAC unit as shown in Fig. 9. The plug end End screws. Be careful not to insert screws where coil damage of the harness extension will connect to the economizer plug in the could occur. If using 2" (50.8mm) filters. the filter spacer must he return chamber and the other end will he routed to and connect in removed. See Fie. 1. the control box. 5. Install the bottom filter in the ITTAC unit next to the indoor coil. Filter rack will rest on the .1 -1VAC base and screw into both the left and right sides of coil FRAME. using #10 x 1/2" Blunt End screws. Be careful not to insert screws where coil damage could occur. 2 it Economizer Plug Hood Top / Filter Clip Outside Air Controller � I .I' jf� /x /_ Economizer a � `�J Outside Air Actuator �� I ' 111111111 '.+ i Low ambient nunm Compressor 1 Lockout switch ION 1 4 , 1 i ,/ Cleanable ' i Aluminum Filter Outside Air Sensor i ( I , a '' Fig. 5 - Filter Installation Fig. 2 - Component Locations �- Replacement �, Panel Shipped ;\ with Economizer Compressor -�� Compa tment ,/, r , �� * _ -•— - /"111 . 1 �`�� I A (1 n 11 i' %'� Economizer J I r,'� ` I Cover Panel C \ i d 2/ J �� � ') 1 ~I.›...,,, i , 21 9116 111111114 \ ` , ` n' � i , l- / "�I ,:547 NI �I) I f> Divide In �, L HVAG nrt Ip 1 1 1 � � II 1 r IIIIIIII V p i . " f� 1 1i2 in. above the'', " ,. V ,9 21 9x16° � top of the left side I I l of the return duct ' (547mm j r ill - ; j i oH � Lggg �' 1 drilling to screw �` � J ": "Filter a i I • thru unit back pan Gasketing '' i Door / • 1 and into the top 3 Sides w { � Sc rear corner of `!fi 22 1!2 _ / L i Caulk these corners into base 5i2mm? Side Panel shipped with HVAC / econom after economizer unit. Remove and Units with base rails will f NOTE //� as sembly is installed '. base rails 1 am have a 2 piece panel. Discard the Fig. 6 - Economizer Installation panel covering the return air chamber and reuse the panel Indoor covering the compressor section. Blower Fig. 3 - Panel Removal Panel I /AC Uni -- \Compressor , Tiii Re iacement ( 498mm i71 Smm) FIts. (A ' II IIIIIII Panel j �� � A\ � � - ! I -,_ Economizer �� N \ I I I I'l �IIIIII Panel /\ ilter \, // \. / ®I Panel • / jj j i / /j / / 22 / / � / // / �� / /� . �" Atuminurn - (5 . 59 m) / / Filter Remove Screw from base pan. Install \ Y economizer then re -insert screw through /�\ slot in economizer into basepan. /-:;-- Fig. 4 - Hood Assembly 3 Fig. 7 - Economizer Installed in H Unit Economizer Harness from Economizer Actuator and controller Self-Drilling Economizer — Screw vSplice Box • SAT Sensor \ Rainhood . 1 , \ , - 1 \ , i on Bracket \ 1 Indoo . , • \ \ , \ \ I-7 H Blower 1 1 r , , „ , \ i : Economizer • / , I \ 1 i Harness i Indoor Indoor .. i :, Blower , ,..__ _-- - 7 I w \ 1 t Blower— L. Panel s., \ • / Compressor Supply Air Temperature (See Fig. 8A) ...,_. Fig. 8 - Routing Harness Extension and Mounting SAT Sensor Fig. 8A - SAT Mounting for Units with Upper Block Off Panel Economizer Supply Air Temperature Sensor (SAT) i Economizer a i Hood i MIIIEDIIIIMINIIIN i 1 i Indoor Blower J. Filter 4 MI■111MNM Economizer -----,.._ Plug I t / i x Indoor Fan i. • i / Harness "— • Control 1 / 1 i Box i Ni .. n---_______-1 t-- i I _._.__,--,, Compressor ,,,_ _.,,- ,. To SAT Sensor Economizer Harness 1111111111111 Fig. 9 - Routing Harness (Top View) Fig. 8B SAT Location for Units without Block Off Panel a,, ,,.„ . , l '°- • . Alp,,,, , 1 ,! , Ain•i 3 ' .. ' "?, 1 " 41-:;Z:::::__,41 1 ■'', ft 4: Indoor '41.--,_, 0 ..-=' Blower Panel ' ..T.Z.,,," . '''..• Fig. 10 - Indoor Blower Panel 4 7. Remove the panel on the HVAC unit covering the indoor blower. See Fig. 11. The (provided) Supply Air Temperature (SAi) sensor which looks like and eyelet terminal, must be installed in the blower section. Attach the 121 pink wires from the economizer harness for extension har- ness) to the SAT. Upper Block -off The SAT sensor is shipped attached to a small bracket. lithe HVAC unit panel (some units) has an upper block off panel. attach the sensor / bracket as shown in Fig. I 81 using a 410 z 5/8 self-drilling screw. I f the unit does not have all up- per block off panel, remove the bracket From the SAT and screw the SAT to the side of the indoor blower, using a :10 x 5/8 "sell- drilling screw, as shown in Fig. 8B. it 8. Replace the panel covering the indoor blower. NOTE: For heat pump units, an additional relay package. Factory kit part � SE` NOTE number CPRLYKiT001100. or field provided relays must be installed in the blower section. Sec heat pump diagram thr details. I CONTROL Installation of Heat Pump Relays ° SECTION INDOOR r, (Available from HVAC unit manufacturer) BLOWER When this economizer is used on heat pump IfVAC units, relays must be added for proper operation. o The relays, which are shown on the attached diagrams, can he field sup- � El El I plied or relay kit CPRLYKTT001 A00 can be ordered. Field provided relays must be: •SPOT, one pole normally open and one normally closed. Same polarity. •Minimum 124 VA inrush. NOTE 1: Field provided Location for heat Acceptable relays include: relays can be mounted pump relay package Hone well: RS2Z2B117 on upper block off number •panel, if applicable 'CPRLYKIT001A00 •Honeywell: R422B1124 •White Rodgers: 91- 103001 -13002 *CPRLY1KlT001A00 is available from HVAC unit manufacturer •White Rodgers: 91- 102006 -13302 Fig. 11 - Relay Package Location Relay Installation: A. If the optional relay kit CPRLYKIT001100 is used, it will mount underneath the indoor blower as shoran in Fig. I t & 12. Follow instructions sent with the package. B. If relays are field provided and installed, they can be mounted above the tipper block off panel, as shown in Fig. 11. Use caution to ensure INDOOR screws do not interfere with blower operation, Blunt end screws are BLOWER recommended. C. If no upper block off panel is present mount relays on compressor partition below indoor blower on left as shown in Fig. 11. . f). Wire the relays per diagram in this instruction. IIME11■11113.111. 9. This step applies to units without base rails only. If the unit does not have a wrap around compressor access panel install the supplied. Screw -� —\ 10. install the 5r'8" easketine on the duct side flanges of the economizer, CPRLYKIT001A00 see Fig. 6. Turn the economizer on its side (Fig. 6.) Slide economizer relay kit into cabinet and as far to the left as possible. The economizer will set against the left side of the unit and will cover the horizontal return stir opening. Caulk as required. 11. Install the replacement return chamber panel over the economizer assembly and underneath the drip flange on the HVAC: unit. Line up the Fig. 12 - Relay Package Installation bottom left hole on the panel with the hole in the bottom of the economizer and the mating hole in the base of the HVAC unit. insert screw, which will hold all parts in place. Insert screws on bottom and right of panel as well. See Fig. 6. 12. At a location 1 112 in. above the top of the left side of the return duct opening use 1" self drilling to screw thro unit back panel and into the toll rear corner of economizer assembly (Fie. 6). 5 13. Caulk or gasket the back side of the hood mating . 1lainges. Install Table 4 - Supply Air Sensor Temperature I assembled hood over the economizer opening in the replacement return Resistance Values chamber panel. Screw in place through pre - punched holes. Make sure all seams are watertight. TEMPERATURE (F) CELSIUS (C) RESISTANCE (ohms) -22 -30 53,010 14. Open the filter clips on the inside of the hood top. Insert the aluminum 4 -20 29,091 filter into the hood and close the clips to hold in place. See Fig. 5. 14 - 10 16,590 15. Remove the filter access (IMPORTANT: On the CPECOMZR012A00 32 0 9,795 filter rack. the 18 x 24 (457.2rmn x 609.6mm) filter must he installed 50 10 5,970 through the filter access door first. Then install the 16 x 24 (406.4mm N 609.6mm) filter and install disposable filters in filter rack. 68 20 3,747 77 25 3,000 16. Through the filter access door (horizontal return panel), adjust 86 30 2,416 the settings on the economizer controller. Review the settings in the Operation section: 104 40 1,597 1. 'Hie standard economizer controller has a factory setting of 122 50 1.080 "C" for the outdoor air temperature changeover and 55° F 140 60 746 (13 "C) for the supply air (mixed air) temperature sensor. The outdoor air temperature sensor setting can be adjusted 158 70 525 at the controller. 2. The low ambient compressor lockout switch setting Economizer Control Modes — Determine the Economizer control is fixed at 42" F (6" C). mode before set up of the control. Some modes of operation may require (or the outdoor air damper can be different sensors. Refer to Table 3. The Economizer is supplied from 3. The minimum position configured at the controller. the factory with a supply air temperature sensor. a low temperature 4. Settings for the optional return air ternperah e sensor compressor lockout switch. and an outdoor air temperature sensor. outdoor enthalpy sensor, indoor enthalpy sensor, and CO, This allows for operation of the Economizer with outdoor air dry bulb sensor can also be configured at the controller. changeover control. Additional accessories can be added to allow for different types of changeover control and operation of the Economizer 17. Replace the filter access panel. Screw in place. and unit. OUTDOOR DRY BULB CHANGEOVER — The standard controller 18. Install all economizer accessories then power 1iVAC unit and test is shipped from the factory configured for outdoor dry bulb changeover cycle economizer. control. The outdoor air and supply air temperature sensors are included as standard. For this control mode, the outdoor temperature is compared to an CONFIGURATION adjustable set point selected on the control. If the outdoor -air temperature is above the set point, the Economizer will adjust the outdoor air dampers Economizer Standard Sensors, to minimum position. If the outdoor -air temperature is below the set point. OUTDOOR AIR TEMPERATURE. (OAT) SENSOR— The outdoor air the position of die outdoor -air dampers will be controlled to provide free temperature sensor is a 10 to 20mA device used to measure the outdoor- cooling using outdoor air. When in this mode. the LED next to the free air temperature. The outdoor -air temperature is used to determine when ce>ohna, set point potentiometer will be on. The changeover temperature the Economizer can be used for free cooling. The operating range of et point is controlled by the free cooling net point potentiometer located temperature measurement is 40" to 100" F (4.4" to 38° C). on the control. See Fig. 13. The scale on the potentiometer is A. B. C. and SUPPLY AIR TEMPERATURE (SAT) SENSOR —The supply air D. See Fig. 14 for the coresponding temperature changeover values. temperature sensor is a 3 K thermistor located at the inlet of the indoor DIFFERENTIAL DRY BULB CONTROL — For differential dry bulb fan. See Fig. 8 and 9. This sensor is field installed. The operating range control the standard outdoor dry bulb sensor is used in conjunction with of temperature measurement is 0 °( -18" C) to 158" F (70° C). See Table 4 an additional accessory return air sensor. The accessory sensor must he for sensor temperature /resistance values. mounted in the retool airstream. See Fig. 15. The temperature sensor looks like an eyelet terminal with wires running In t hi s mo o f operation, the outdoor -air temperature is compared to to it. The sensor is located in the "crimp end" the return-air temperature and the lower temperature .airstream is used and is sealed from moisture. for cooling. When using this mode of changeover control, turn the free LOW TEMPERATURE COMPRESSOR LOCKOUT cooling /enthalpy set point potentiometer fully clockwise to the D setting. SWITCH—The Economizer is equipped with a low ambient temperature S Fie, 14. lockout switch located in the outdoor airstream which is used to lock out OUTDOOR ENTHALPY CHANGEOVER —For enthalpy control. the compressors below a 42° F (6" C) ambient temperature. accessory enthalpy sensor is required. Replace the standard outdoor dry bulb temperature sensor with the accessory enthalpy sensor in the saute mounting location. 6 Exhaust Fan Setpoint LED Lights When Exhaust smade m , _ a << IIIIIl91111111111111111 / Minimum Damper ,;_ - 1111111111111111111111411111111 Position Setting ;,�;± \ Fl ' I� ` ✓✓i 1 t Maximum Damper Demand o == Control Ventilation �,,o, l p , Setpoint ' LED Light when Demand m a; , � ;�� 1 Y. ECONOMIZER j i Control Ventilation Input is : 1 )-„i - i ' Above Setpoint � ) ' "�' I Demand Control F EE / �� I I Ventilation Setpoint , %,. LED Light when Outdoor Air is Suitable for Free Cooling I Enthalpy Changeover Setpoint RETURN AIR, Fig. 13 - Economizer Controller Potentiometer SENSOR LED Location 19 RETURN DUCT 18 LED ON (FIELD- PROVIDED) - 17 `_,, Fig. 15 - Return Air Temperature or Enthalpy 16 LED OFF ` , _ LED ON Sensor Mounting Location C 15 LED OFF _ LED ON 14 ME iNDOOR. QUALITY (TAQ) SENSOR INPUT The TAQ input can 13 © ■�■■ he used for demand control ventilation control based on the level of CO_ 1111111111 LED OFF LED ON III measured in the space or return air duct. 12 ��M�II��� 4 sensor according to manufacturers specifications. Mount the accessory IAA P 11 the lA(? sensor should be wired to the .4Q and AQI terminal, of the 19 11111.1111111.1.11 LED OFF controller Adjust the DCV potentiometers to correspond to the DCV 1 ) voltace output of the indoor air quality sensor at the user - determined set 9 _ 40 45 50 55 60 65 70 75 80 85 90 95 100 point See f 15. ( ( ( 10 ) ( 13 ) ( 16 ) ( 18 ) ( 21 ) ( 24 ) (27) (29) (32) (35) (38) Degrees in. Fahrenheit (Celsius) - Fig. 14 - Outdoor Air Temperature Changeover Set Points When the outdoor airenthalpvrises above the outdoor enthalpy changeover set point, the outdoor -air dumper moves to its minimum position. The outdoor enthalpy changeover set point is set with the outdoor enthalpy set point potentiometer on the Economizer controller. The set points arc A, B, C. and D. See Fig. 14. The factori-installed (i20-ohm jumper must be in place across terminals SR and SR= on the Economizer controller. See Wiring Diagram Page 13 & 14. DIFFERENTIAL ENTHALPY CONTROL — For differential enthalpy control, the Economizer controller uses two enthalpy sensors. one in the outside air and one in the return airstream. The Economizer controller compares the outdoor air enthalpy to the return air enthalpy to determine Economizer use. The controller selects the lower enthalpy air (returns or outdoor) for cooling. For example, when the outdoor air has a lower enthalpy than the return air and is below the sei point the Economizer opens to bring in outdoor air for free cooling. Replace the standard outside air dry bulb temperature sensor with the accessory enthalpy sensor in the same mounting location. Mount the return air enthalpy sensor in the return air duct. See Fig. 15. When using this mode of chamgeover control, turn the enthalpy set point potentiometer fully clockwise to the D setting. 7 f 85 90 95 100 105 110 (29) (32) (35) (38) (41) (43) e� �1 111 i CONTROL CONTROL F(C) ,,x‘ pt CURVE APA 50 %RH °F (°Cy r AT50 a` ti 80 27)A 70 (21) O � C 67 70 (21) P r ;41•,4 C (19) IP % ' 0 63 (17) -i 4 S ( /AP g A 4 #4 pri PO P *A Q 't 0; ,, Q h v 65 Quo- (18 �, out 401P0 , , ry 60 , ti i d ►� 55 /�� � ..'-° \\NN 501 <4.4111K I , 10 IAPII 4 41141111 $ 45 D -.wf �P' ■ 4 (:) 4 ? 40. ( 3 2 , 40 0. 4 . Aft,445iliv il*, ., willimpr. 1 0 0P 44fpriirg NJiiik■Ng IP. 16 .407040010 ■ A 1. -�,_ o � __04 _.5806 35 40 45 50 55 80 65 70 75 80 85 90 95 100 105 110 (21 (4) (7) (t0) (131 (16) (18) (21) (24) (27) (29) (32) (35) (38) (411 (43) APPROXIMATE DRY BULB TEMPERATURE - ° F ( °C) Fig. 16 - Enthaipy Change over Setpoints / ti , 1 t �E(N j .`.. ... ..... ,` IH J TRI i , - (( �� I l CO MAX RANGE SETTING Y I 1 1 1 6000 1 E q —Fh ir�s) j' I P7 r ��,, t V c O it z � vac rom L o - 5000 i u P ( ) ,,,,, I Ho X' z �l P j r- � ' 4000 \ T O' Q \� -- 800 ppm 1 j i- - 900 ppm /7\ C` ' \ i I — o ! 3000 \ � * - 1000 ppm Max t 1100 ppm S Z 2000 A G , ' DCVO) I j Z `� � �_ IN n AOL � :;CV ( 1 Lt1 1000 2V‘ V' )1' ,, z so I1 _ Q 0 SR � F n�i 1 c F f EF1 ,' I I CC 2 3 4 5 6 7 8 l SR 'ewe DAMPER VOLTAGE FOR MAX VENT{LAT40N RATE \ — �: Fig. 17 - Economizer Controller Fig. 18 - CO, Sensor Maximum Range Setting 8 EXHAUST SET POINT ADJUSTMENT —'The exhaust set point will DAMPER MOVEMENT — Damper movement from full open to full determine when the exhaust fan runs based on damper position (if power closed (or vice versa) takes 2 lit minutes. exhaust is installed). The set point is modified with the Exhaust Fan Set THERMOSTATS — The Economizer control works with conventional Point (ENH SET) potentiometer. See Page 13 & 14 Wiring, Diagram. thermostats that have a Y I (cool stage I ). Y2 (cool stage 2). W I (heat The set point represents the damper position above which the exhaust stage I). W2 (heat stage 2). and G (fan), The Economizer control does fans will he turned on. When there is a call for exhaust,. the Economizer not support space temperature sensors. Connections are made at the controller provides a 45 + 15 second delay before exhaust fan activation thermostat terminal connection hoard located in the main control box. to allow the dampers to open. this delay allows the damper to reach the OCCUPANCY CONTROL — the factory default configuration for the appropriate position to avoid unnecessary tan overload. Economizer control is occupied mode. Occupied status is provided by the MINIMUM POSITION CONTROL. — There is a minimum damper black jumper from terminal TR to terminal N. When unoccupied mode is position potentiometer on the F.conotnizer controller. See Fig. 13 and desired, install a field supplied timeclock function in place of the juniper Wiring Diagrams Page 13 & 14. The minimum damper position maintains between TR and N. See Page 13 & 14 Wiring Diagram. When the the minimum airflow into the building during the occupied period. timeclock contacts are closed, the Economizer control will be in occupied When using demand ventilation, the minimum damper position represents mode. When the timeclock contacts are open (removing the 24 -v signal the minimum ventilation position for VOC (volatile organic compound) from terminal N), the Economizer iV will be in unoccupied mode. ventilation requirements. The maximum demand ventilation position is DEMAND CONTROLLED VENTTT_ATION (DCV) —AVhen using the used for fully occupied ventilation. Economizer for demand controlled ventilation. there are some equipment When demand ventilation control is not being used, the minimum position selection criteria which should he considered. When selecting the heat potentiometer should he used to set the occupied ventilation position. The capacity and cool capacity: of the equipment_ the maximum ventilation maximums demand ventilation-position should he turned fully clockwise. rate must he evaluated for design conditions. The maximum damper Adjust the minimum position potentiometer to allow the minimum amount position must be calculated to provide the desired fresh air. of outdoor air, as required by local codes, to enter the building. Make Typically the maximum ventilation rate will he about 5 to 10% more minimum position adjustments with at least 10" F (12.2" C) temperature than the typical elfin required per person, using normal outside air design difference between the outdoor and return -air temperatures. criteria. To determine the minimum position setting. pert cm the following. An exponential anticipatory strategy should be taken with the following procedure: conditions: a zone with a large area, varied occupancy, and equipment that cannot exceed the required ventilation rate at design conditions. Exceeding 1. Calculate the appropriate mixed air temperature using the the required ventilation rate means the equipment can condition air at a following formula: maximum ventilation rate that is greater than the required ventilation rate for maximum occupancy. An exponential - anticipatory strategy will cause (To x OA! 100) + (TR x RAI l 00) = TM the fresh air supplied to increase as the room CO. level increases even = Outdoor-Air Temperature though the CO, set point has not been reached. By the time the CO, OA = Percent of Outdoor Air level reaches the set point, the damper will be at maximum ventilation T = Return -Air Temperature and should maintain the set point. RA = Percent of Return Air In order to have the CO, sensor control the economizer damper in h n = Mixed -Air Temperature this manner_ first determine the damper voltage output for minimum or base ventilation. Base ventilation is the ventilation required to remove As an example, if local codes require 10% outdoor air during contaminants during unoccupied periods. The following equation may occupied conditions, outdoor-air temperature is 60'' F be used to determine the percent of outside -air entering the building fir (15.6 "C). and return-air temperature is 75" F (23.9' C). a given damper position. For best results there should he at least a 10" F (60 x .10) + (75 x .90) = 73.5" F (23.1u C) (12.2" C) difference in outside and return -air temperatures. 2. Disconnect the supply air sensor from terminals l' and T1. (To x OA /100) 4- (T x RA/1001= „, 3. Ensure that the factory - installed jumper is in place across T Outdoor -Air Temperature terminals P and P 1.,ifremote damper positioning is being OA = Percent of Outdoor Air used, make sure that the terminals are wired according to Fig. T = Return -Air Temperature 9 and that the minimum position potentiometer is turned fully RA = Percent of Return Air clockwise. h' = Mixed -Air Temperature 4. Connect 24 vac across terminals TR and TR I. Once base ventilation has been determined, set the minimum damper 5. Carefully adjust the minimum position potentiometer until position potentiometer to the correct position. the measured mixed -air temperature. matches the calculated The same equation can be used to determine the occupied or maximum value. ventilation rate to the building. For example, an output of 3.6 volts to the 6. Reconnect the supply air sensor to terminals T and T 1. actuator provides a base ventilation rate of 5% and an output of 6.7 volts provides the maximum ventilation rate of 20`ib (or base plus 15 cfnn per Remote control of the Economizer damper is desirable when requiring person). Use Fig. 18 to determine the maximum setting of the CO, sensor. additional temporary ventilation. ifatield- supplied remote potentiometer For example, a 1100 ppm set point relates to a 15 ctin per person design. (Honeywell part number S963B 1 128) is wired to the Economizer Use the 1100 ppm curve on Fig. 17 to find the point when the CO, sensor controller. the minimum position of the damper can be controlled from output will be 6.7 volts. Line tip the point on the graph with the left side a remote location. of the chart to determine that the range configuration for the CO_ sensor To control the minimum damper position remotely, remove the factory- should be 1800 ppm. The Economizer controller will output the 6.7 volts installed jumper on the P and PI terminals on the Economizer controller. from the CO_ sensor to the actuator when the CO, concentration in the Wire the field - supplied potentiometer to the P and P I terminals on the space is at 1100 ppm. Economizer controller. See Wiring Diagram Page 13 & 14. • 9 • The DCV set point may be left at 2 volts since the CO, sensor voltage OPERATION 'i11 be ignored by the Economizer controller until it rises above the 3.6 Sequence of Operation — When free cooling is not available. the volt setting of the minimum position potentiometer. compressor will he controlled by the thermostat. When free cooling is Once the fully occupied damper position has been determined, set the available, the outdoor -air damper is modulated by the Economizer control maximum damper demand control ventilation potentiometer to this to provide a 50" to 55" F (10' to 12.8" C) supply -air temperature into the position. Do not set to the maximum position as this can result in over- zone. As the supply -air temperature fluctuates above 55" F ventilation to the space and potential high- humidity levels. (12.8" C) or below 50' F (10" C), the dampers will be modulated (open or CO, SENSOR CONFIGURATION — The CO, sensor has preset close) to bring the supply -air temperature hack within the set points. standard voltage settings that can he selected anytime after the sensor is For Economize)' operation, there must he a thermostat call for the fan (G). powered up. See Table 5. This will move the damper to its minimum position during the occupied Use setting 1 or 2 for equipment. See Table 5. mode. 1. Press Clear and Mode buttons. Hold at least 5 seconds until Above 50" F (I0 C) supply -air temperature, the dampers will modulate the sensor enters the Edit mode. from 100% open to the minimum open position. From 50" F (10" C) 2. Press Mode twice. The STDSET Menu will appear. to 45" F (7.2" C) supply -air temperature. the dampers will maintain at 3. Use the Up /Down button to select the preset number. See the minimum open position. Below 45" F (7.2" C), the dampers will be Table 5. completely shut. As the supply -air temperature rises, the dampers will 4. Press Enter to lock in the selection. conic back open to the minimum open position once the supply -air 5. Press Mode to exit and resume normal operation. temperature rises to 48" F (8.9" C). The custom settings of the CO, sensor can be changed anytime after the ) f power exhaust is installed, as the outdoor -air damper opens and closes, sensor is energized. Follow the steps below to change the non - standard the power exhaust fans will be energized and deenergized. settings: If field - installed accessory CO, sensors are connected to the Economizer 1. Press Clear and Mode buttons. Hold at least 5 seconds until control, a demand controlled ventilation strategy will begin to operate.. As the sensor enters the Edit mode. the CO, level in the zone increases above the CO, set point, the minimum 2. Press Mode twice. The STDSET Menu will appear. position of the damper will he increased proportionally. As the CO, level 3. Use the Up /Down button to toggle to the NONSTD menu decreases because of the increase in fresh air. the outdoor -air damper will and press Enter_ he proportionally closed. Damper position will follow the higher demand 4. Use the Up /Down button to toggle through each of the nine condition from DCV mode or free cooling mode. variables, starting with Altitude, until the desired setting is Damper movement from full closed to full open (or vice versa) will take reached. between 1 I/2 and 2 1/2 minutes. 5. Press Mode to move through the variables. If free cooling can he used as determined from the appropriate changeover 6. Press Enter to lock in the selection, then press Mode to command (switch. dry bulb, enthalpy curve, differential dry bulb, or continue to the next variable. differential enthalpy). a call for cooling (VI closes at the thermostat) will DEHUMIDIFICATION OF FRESH AIR WITH DCV CONTROL.— cause the control to modulate the dampers open to maintain the supply air Information from ASHRAE indicates that the largest humidity load on temperature set point at 50" to 55" F (10" to any zone is the fresh air introduced. For some applications, an energy 12.8 C). recovery unit can he added to reduce the moisture content of the fresh As the supply air temperature drops below the set point range of 50" to air being brought into the building when the enthalpy is high. In most 55" F (I (J" to 12.8" C) the control will modulate the o utd o o - air d aun pers cases, the normal heating and cooling processes are more than adequate closed to maintain the proper supply - air temperature. to remove the humidity loads for most commercial applications. If normal rooftop heating and cooling operation is not adequate for the outdoor humidity level, an energy recovery unit and /or a deh WTI l CI lication option should be considered. .Table 5 - CO Sensor Standard Settings VENTILATION CO. OPTIONAL RELAY SETTING EQUIPMENT OUTPUT RATE ANALOG CONTROL RANGE RELAY SETPOINT HYSTERESIS (cfm /Person) OUTPUT (ppm) (ppm) (ppm) 0 -10V 1 Proportional Any 4 -20mA 0 -2000 1000 50 Interface w/ Standard 2 -10V 2 Building Control System Proportional Any 7 -20mA 0 -2000 1000 50 0 -10y . 3 Exponential Any 4 -20mA 0 -2000 1100 50 0 -10V 4 Proportional 15 4 -20mA 0 -1100 1100 50 0 -10V 5 - Proportional 20 4 -20mA 0 -900 900 50 Economizer 0 -10V 6 Exponential 15 4 -20mA 0 -1100 1100 50 0 -10V 7 Exponential 20 4 -20mA 0 -900 900 50 0 -10V 8 Health & Safety Proportional -- 4 -20mA 0 -9999 5000 500 Parking/ Air Intakes/ 0 -10V 9 Loading Docks Proportional -- 4 - 20mA 0 -2000 700 50 10 TROUBLESHOOTING 6. Turn the DCV and Exhaust potentiometers CCW until the Exhaust LED aims on. 1-he exhaust contacts will close 30 to See Table 6 for Economizer logic. 120 seconds after the Exhaust LED turns on. An Economizer simulator program is available to help with Economizer 7. Return Economizer IV settings and wiring to normal after training and troubleshooting. completing troubleshooting. Economizer Preparation -This procedure is used to prepare the DCV Minimum and Maximum Position -To check the DCV minimum • Economizer for troubleshooting. No troubleshooting or testing is clone and maximum position . by performing the following procedure. I. Make sure Economizer preparation procedure has been • NOTE: This procedure requires a 9 -v battery. 1.2 kilo -ohm resistor. and it • performed. 5.6 kilo -ohm resistor which are not supplied with the Economizer. 2. Connect a 9 -v battery to AQ (positive node) and AQI I. Disconnect power at ER and TRI. All LEDs should be off. (negative node). The DCV LED should turn on. The actuator Exhaust fan contacts should be open. should drive to between 90 and 95% open. 2. Disconnect device at? and Pl. 3. Turn the DCV Maximum Position potentiometer to 3. Jumper P to P 1. midpoint. The actuator should drive to between 20 and 80% 4 . Disconnect wires at T and T 1 . Place 5.6 kilo -ohm resistor open. across T and T1. 4. Turn the DCV Maximum Position potentiometer to fully 5. Jumper TR to I. CCW. The actuator should drive fully closed. 6..lumper TR to N. 5. Turn the Minimum Position potentiometer to midpoint. 7. if connected remove sensor from terminals SO and +. The actuator should drive to between 20 and 80% open. Connect 1.2 kilo -ohm 4074E J VI checkout resistor across 6. Turn the Minimum Position Potentiometer Fully CW. The terminals SO and +. actuator should drive fully open. 8. Put 620 -ohm resistor across terminals SR and +_ 7. Remove the jumper from TR and N. The actuator should 9. Set minimum position. DCV set point, and exhaust drive fully closed. potentiometers fully CCW (counterclockwise). 8. Return Economizer settings and wiring to normal after 10. Set DCV maximum position potentiometer fully CW completing troubleshooting. (clockwise). Supply - Air Input - To check supply -air input: I I . Set enthalpy potentiometer to D. I. Make sure Economizer preparation procedure has been 12. Apply power (24 vac) to terminals TR and TRI . performed. Differential Enthalpy - To check differential enthalpy: 2. Set the Enthalpy potentiometer to A. The Free Cool LED I. Make sure Economizer preparation procedure has been turns on. The actuator should drive to between 20 and 80% performed. open. 2. Place 620 -ohm resistor across S„ and +. 3. Remove the 5.6 kilo -ohm resistor and jumper T to T I . The 3. Place 1.2 kilo -ohm resistor across S and +. The Free Cool actuator should drive filly open. LED should he lit. 4. Remove the jumper across T and TI . The actuator should 4. Remove 620 -ohm resistor across S and +. The Free Cool drive fully closed. LED should turn off 5. Return Economizer settings and wiring to normal after 5. Return Economizer settings and wiring to normal after completing troubleshooting. completing troubleshooting Economizer Troubleshooting Completion - Single Enthalpy - To check single enthalpy: This procedure is used to return the Economizer to operation. No I. Make sure Economizer preparation procedure has been troubleshooting or testing is done by performing the following • performed. procedure. 2. Set the enthalpy potentiometer to A (Fully CCW). The Free I. Disconnect power at TR and'1RI. Cool LED should be lit. 2. Set enthalpy potentiometer to previous setting. 3. Set the enthalpy potentiometer to D (fully CW). The Free 3, Set DCV maximum position potentiometer to previous Cool LED should turn off. - setting. 4. Return Economizer settings and wiring to normal after 4. Set minimum position. DCV set point, and e..haust completing troubleshooting potentiometers to previous settings. DCV (Demand Controlled Ventilation) and Power Exhaust 5. Remove 620 ohm resistor from terminals SR and- . To check DCV and Power Exhaust 6. Remove 1.2 kilo -ohm checkout resistor from terminals SO I. Make sure Economizer preparation procedure has and +. If used, reconnect sensor front terminals SO and +. been performed. 7. Remove jumper front TR to N. 2. Ensure terminals AQ and AQ I are open. The LED for both 8. Remove juniper from TR to 1. DCV and Exhaust should be off. The actuator should be fully 9. Remove 5.6 kilo -ohm resistor from T and Ti. Reconnect closed. wires at T and T 1. 3. Connect a 9-v battery to AQ (positive node) and AQ I 10. Remove jumper from P to P I . Reconnect device at P and (negative node). The LED for both DCV and Exhaust should Pl turn on. 11. Apply power (24 vac) to terminals TR and TR 1. The actuator should drive to between 90 and 95% open. 4. Toni the Exhaust potentiometer CAV until the Exhaust LED turns off. The LEL) should turn tiff when the potentiometer is approximately 90 %. The actuator should remain in position. 5. Turn the DCV set point potentiometer CW until the DCV LED turns off. The DCV LED should turn off when the potentiometer is approximately 9 -v. The actuator should drive fully closed. 11