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Specifications RECEIVED JAN 3 0 2013 CITY OF TIGARD • BUILDING DIVISION STRUCTURAL CALCULATIONS FOR PIONEER WATERPROOFING 14830 SW 72nd AVE TIGARD, OR 97224 -- ROOF MECHANICAL UNIT -- CITY OF TIGARD �D PROF Approved.j1 J. . ��� PROF" Approved....[ ] Ntt• 12,1s�e� / See Letter to:Follow..„..... [ Atta hed.... ........... 1 Permit benEG 'r MA. • Ad. • .rd .o _' r OR' ON By: Date:imam. •—•1111•—•1111 ti \ N p�- F. NOR Approved plans shall be on job si5. vtl' EXPIRES:12/31/14 ` � 6(0----tc/ l� U OFFICE COPY Contents Details A-B D1 -D2 Lateral Calculations L1 -L2 Contact Person: John E Nordling,PE Enclosures El -E5 NORDLING Proj. No.: 13-033 STRUCTURAL GOODIES BLATE EAVER ON ENGINEERS, LLC OREGON HEATING&AIR CONDITIONING 6775 SW 111th,Suite 200 Beaverton OR,97008 Date: JAN 2013 By: JEN Sheet No.: COVER , dmneuUuunuuumninnuuuu� :1 A n u ssimii • -� x o - emr. 0 , . i • il ..:. ,, e ems_ i. ► • C sem—I w_._�r G .II � 6e IA CZ 11 ; (4) STEEL BRACKETS W/ (4) "10 x 1/2' ` TEK SCREWS TO CURB d (4) "10 x '/z' TEK SCREWS TO UNIT BASE RAIL Ill'IIII:0 ❑1 MECHANICAL UNIT —UNIT BASE RAIL C4) "10 SCREWS �r ,. —(4) "10 SCREWS Q STEEL BRACKET / 1 _" "12 WOOD SCREWS EA. RAFTER CURB------..., FLASHING 4 ROOFING BY OTHERS LEVELING CURB (AS REQ'D) 1 — — — 1 �(E) 2x RAFTERS - n VERIFICATION OF ROOF SUPPORT MEMBER BY OTHERS. ,c,0 PROFF /o 12,1: 1 iri OREGON 10;;) 1 AIL410 ✓L�- 75, A9g 011 OyN E.. NOR)v EXPIRES: 12/31/14 tt--5—t NORDLING Proj. No.: 13-033 STRUCTURAL GOODIES HCLATE BEOVER ON ENGINEERS, LLC OREGON HEATING&AIR CONDITIONING 6775 SW 111th,Suite 200•Beaverton OR,97008 Date: JAN 2013 By: JEN Sheet No.: D2 , Earthquake Hazards Program 2005 ASCE 7 Standard Location 45°24'46.63"N Ss and S1=Mapped Spectral Acceleration Values 122°44'56.54" W 14830 SW 72nd Ave,Tigard,OR Ground Motion Ss 0.940 Si 0337 Occupancy Category II Site Coefficients Fa 1.12 Site Class D Fv 1.73 Importance Factor 1.00 Height of Structure 20.0 ft SMS Fa* Ss 1.057 SMI Fv * Si 0.582 Design Category(SDC) D SDs (2/3)SMS 0.704 SDI (2/3)SMI 0.388 Air Side HVAC Eq= 0.279W+ 0.2 SDS W ap 2.50 Rp 6.00 W :Weight of Unit •S 0.4 ( I z ,� DS a n Fp= 1+2•— •Wp Rp h z= 20.0 ft ASD FP= 0.35 WP->* 0.7 0.247 z= 24.0 ft FP= 0.40 WP->* 0.7 0.279 Fp MIN= 0.3 SDS IP WP = 0.211 WP->* 0.7 0.148 FP MAX= 1.6SDS IPWP = 1.13 WP->* 0.7 0.789 NORDLING Proj. No.: 13-033 5 ' GOODIES CHOCOLATE STRUCTURAL BEAVERTON :' „� ENGINEERS, LLC OREGON HEATING&AIR CONDITIONING 6775 SW 111th,Suite 200 Beaverton OR,97008 Date: JAN 2013 By: JEN Sheet No.: L 1 <0 vEa 141 lbs c9S. W. 1,000 lbs . Height 47" Weight 1,000 lbs Length 88" ,-N- . Width 53" Curb 14" Itigim‘ VEQ= 0.279* 1,000 lbs+0.2* 0.704* 1,000 lbs = 279 lbs+141 lbs vEa T= 279 lbs * (14" +47"/2)/53" 21E9 Ibs + 141 lbs/2 ttl - 0.6* 1,0001bs/2 _ -32 lbs [O Net Uplift] C: 32 lbs V= 2791bs (4) 'MH-PRC-HOLD' 16 Ga GALVANIZED STEEL BRACKET W/ (4) "10 x 1/2' TEK - SCREWS TO ROOF CURB 4 (4) *10 x 1/2" TEK SCREWS TO UNIT BASE RAIL -ok- "12 612' o/c SCREWS TO EA. EXISTING 2x RAFTER BELOW. -ok- ~ NORDLING Proj. No.: 13-033 115 Cr GOODIES CHOCOLATE STRUCTURAL BEAVERTON ENGINEERS, LLC OREGON HEATING&AIR CONDITIONING 6775 SW 111th,Suite 200 Beaverton OR,97008 Date: JAN 2013 By:JEN Sheet No.: L.L I c A.d ‘ 3 '\J MODCEI7dliadd-0189ACGl .L�E b \ ..66 LL: 4 Q 0 NRJO31bD 11111111111 3DHb'IO bL-JAE Nln1 4.‘41,%.% , Na ., \ `� .\ \ 'i \\ `� �. • \. - ` \ \ -�\ �V �\ -�--..,, -.....„ ,,• �,. • . , --,., z Aad 2S ENM 3NOSN3W13 ..tel ES ZdJ ELD-79/970 CBDOC7 d .SSL .. 8S 99 1 - srs S • b!L b ..9/L E— +-.C£91+ .9/E 6 ..tnM1 61 ��� I .as S � a .blEb 00 1 1 C`) 0 I “EIS 6 r�— • { f .UL tZ7 • /vt�L�2�M f .17/1 EC Alii ZS 81LEZ - Jj'ozEcH It LL bek _l_ 1MbaJ01\019NaiY10 1d -o- .95El x..11. .21L6�Z1LLL ___i___ T irrigi . 1-- --J L- --J y TDLLV1-MISJI3Dd;B S.U'WCCCCIeafT VISNI HIM SNO SN3A10-fWA612 'Z ' SLMTR/NOQAC1W1SICH SI-1 Zl 1aMba-a-u.-(L-HL'L 1".-.95 LZ .Sl1` D1V D03ar9 M310t 31413ACSI 3-11I-erTh1-11 B'Vd SS<PDO dACO a • 0- .. �B+V06L'8 H91�ODZ I B��f L) NOLLOaNNCO So01cN.t£ O-G01`Z 4- O9) hDLLDa•hDO So' d'J.UL a il,A HV�Od1 /►� k, .8/G Lb a-CH'VID.Ii&Isga2Ds/.1k d3DnaDapW?BS�,�/,1I e ' \ a-CH VD..9/L a?1M-CEL11W L w` .8&LC 1 . 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CHK BY DATE 7650 S.W.Beveland St,Suite 100 JOB NO Tigard, Oregon 97223 lit-1 Phone(503)443 3900 ' t-k) /_9-�L/i- 1r SHEET 6.1g"/of ' RECEIVED JAN 3 0 2013 0 E CITY OFTIGARD • BUILDING DIVISION Model Number YSC092F3EMA**D00000000000**** Customer: Oregon Heating & A/C Project: Pioneer Water Li p ` Name : 3-10 Ton R410A PKGD Unitary Gas/Electric Rooftop General Unit function DX cooling,gas heat Unit efficiency Standard efficiency Airflow Convertible configuration Airflow Application Downflow Design Airflow 3000dm Fresh air selection Econ-dry bulb 0-100%w/ bar relief 3ph Tonnage 7.5 Ton Dual compressor Cooling Entering DB 80.00F Cooling Entering WB 67.00F Ent Air Relative Humidity 51.08% Ambient Temp 95.00F Heating capacity Medium gas heat 3ph Heating EAT 70.00F Voltage 208-230/60/3 Design ESP 0.500in H2O Major design sequence F-R-410A With Microchannel Evaporator rows 3.00Each Evaporator fin spacing 192Per Foot Evaporator face area 12.36sq ft Evaporator face velocity 243ft/min 'Min. unit operating weight 847.OIb Max. unit operating weight 1012.Olb 'ASHRAE 90.1 Yes Rated capacity(AHRI) 89.3 CDQ IPLV @ AHRI 13.OIPLV Main Cooling IPLV @ AHRI 13.OIPLV Evap Coil Leaving Air Temp(DB) 58.11F Evap Coil Leaving Air Temp (WB) 56.86F Cooling Leaving Unit DB 59.29F Cooling Leaving Unit WB 57.32F Gross Total Capacity 94.00MBh Gross Sensible Capacity 70.93MBh Gross Latent Capacity 23.07MBh Net Total Capacity 91.30MBh Net Sensible Capacity 68.23MBh Net Sensible Heat Ratio 0.75Number Fan motor heat 2.70MBh Dew Point 56.05F Refrig charge (HFC-410A) -ckt 1 3.9Ib Refrig charge (1-IFC-410A) - ckt 2 3.6Ib Saturated Discharge Temp Circuit 117.36F 1 Saturated Suction Temp Circuit 1 50.97F Saturated Discharge Temp Circuit 117.84F 2 ISaturated Suction Temp Circuit 2 52.67F CDQ Performance IPLV©AHRI 13.0IPLV Dehumidification IPLV©AHRI 13.0IPLV P...P l 1 TRANS' Main Heating IPLV @ AHRI 13.OIPLV Input Heating Capacity 150.00MBh Output Heating Capacity 121.50MBh Output Heating Cap. w/Fan 124.20MBh Heating LAT 107.80F Heating Delta T 37.80F Motor/Electrical ' IPLV @ AHRI 13.OIPLV Component SP 0.140in H2O Total Static Pressure 0.639999985694885 Field supplied drive kit required None Indoor mtr operating power 1.10bhp Indoor RPM 744rpm Indoor Motor Power 0.82kW Outdoor Motor Power 0.70kW Compressor Power 6.60kW System Power 8.12kW EER @ AHRI Conditions 11.2EER MCA 39.30A MOP 50.00A Compressor 1 RLA 14.50A Compressor 2 RLA 13.60A Condenser fan FLA 4.00A Evaporator fan FLA 3.60A Exhaust fan power 0.65kW IEER 13.00 Acoustics IPLV @ AHRI 13.OIPLV OX Cooling, Gas Heat 3-10 Ton Unit controls Electro mechanical controls 3 ph Field installed accessories Roof curb Roof curb • II � Pa?e 2 s 0 TRAIN' • TOP PANEL • EV: ;;;: ORATOR SEION ACCEL CONDENSER FAN CONNSATE T) i . _14 , �l���h1 :�:��11111,.........._..., ,. ONDENSER COIL.:. ,„ ,..„... �I 4 1/4' 27 518" \`t , '" NIT CONTROL WIRE 7/8"DIA.HOLE '4\ i ,/ ERVICE GAUGE PORT ACCESS 1 3/8"DIA.HOLE 47 718" � i/t � NIT POWER WIRE r=% 1/2"NPT GAS CONNECTION r2�/ (80MBH&120MBH) 3/4"NPT GAS CONNECTION (150MBH,200MBH&250MBH) ONTROL AND COMPRESSOR ACCESS PANEL PACKAGED GAS I ELECTRICAL THROUGH THE ISOMETRIC VIEW BASE CONDENSATE_____„.........,,i1/8"118 27 5/8"� /l NOTES: 1.THRU-THE-BASE ELECTRICAL IS NOT STANDARD ON ALL UNITS. 1— 2.VERIFY ALL DIMENSIONS WITH INSTALLER DOCUMENTS BEFORE INSTALLATION. - OS4 I33" I 32 1/8" SUPPLY II RETURN I I A \ I� X17 12" 9 7/8" o-17 112" I 3 5/8" PLAN VIEW UNIT DIMENSION DRAWING a 46 7/8" RETURN HA R NTAL FOL W 32 1/4" 23 718" SUPPLY 2414 2"9 IIIIIII I o o = r I o o I 4 314"F 9 �8" 5¢6„ MIIl���>_II-19 1/4" 93/8" 16 3/4"--.- �7/8" 4 1/4" - CONDENSATE 5 518" - I 88 5/8" 7 5/8" - - PACKAGED GAS/ELECTRICAL - 53 1/4" DIMENSION DRAWING s • TRANE • 00IIIRETURN '',„,, 40007 3/4"-14 DIA HOLE CONDENSATE DRAIN 8 ft I 27 5/8" \ 43/4" it ISOMETRIC-PACKAGED COOLING PaRr 4 9 TRANS ELECTRICAL/GENERAL DATA • GENERAL(2)(4X6) HEATING PERFORMANCE Model: YSC092F Oversized Motor HEATING-GENERAL DATA Unit Operating Voltage: 187-253 MCA: N/A m Mediu Model:Unit Primary Voltage: 208 MFS: N/A Heating Heating Mput l: Mediu 150,000/105,000 Unit Secondary Voltage 230 MCB: N/A Heating Output(Btu): 120,00084,000 Unit Hertz: 60 No.Burners: 3 Unit Phase: 3 No.Stages 2 EER 11.2 Standard Motor Field Installed Oversized Motor Gas inlet Pressure MCA: 393 MCAN/A Natural Gas(Min/Mix): 4.5/14 MFS: 50.0 MFS: N/A LP(Min/Max) 11.0/14.0 MCB: 50.0 MCB: N/A Gas Pipe Connection Size: 3/4" INDOOR MOTOR Sandard Motor Oversized Motor Field Installed Oversized Motor Number: 1 Number: N/A Number: N/A Horsepower 1.0 Horsepower: N/A Horsepower N/A Motor Speed(RPM): — Motor Speed(RPM): N/A Motor Speed(RPM): N/A Phase 3 Phase N/A Phase N/A Full Load Amps: 3.6-3.5 Full Load Amps: N/A Full Load Amps: N/A Locked Rotor Amps: 12.5 LockedRotorAmps: N/A Locked Rotor Amps: N/A COMPRESSOR Circuit 112 OUTDOOR MOTOR Number: 2 Number: 1 Horsepower: 3.7/3.1 Horsepower: 0.7 Phase: 3 Motor Speed(RRM): 1100 Rated Load Amps: 14.5/13.6 Phase: 1 Locked Rotor Amps: 98.0/83.0 Full Load Amps: 4.0 Locked Rotor Amps: 9.4 POWER EXHAUST ACCESSORY (3) FILTERS REFRIGERANT (2) (Field Installed Power Exhaust) Type P410 Phase: N/A Type: Throwaway Horsepower: N/A Furnished: Yes Factory Charge Motor Speed(RPM): N/A Number 4 Ciruit#1 3.5 lb Full Load Amps: N/A Recommended 20"x25"x2" Ciruit#2 3.3 lb Locked Rotor Amps: N/A NOTES: 1.Maximum(HACR)Circuit Breaker sizing is for installations in the United States only. 2.Refrigerant charge is an approximate value.For a m ore precise value,see unit nameplate and service instructions. 3.Value does not include Power Exhaust Accessory. 4.Value includes oversized motor. 5.Value does not include Power Exhaust Accessory. 6.EER is rated atAHRI conditions and in accordance with DOE test procedures. r $ • TRANE s, . 0 INSTALLED ACCESSORIES NET WEIGHT DATA ACCESSORY WEIGHTS ECONOMIZER 36.0 lb MOTORIZED OUTSIDE AIR DAMPER O MANUAL OUTSIDE AIR DAMPER ,________, BAROMETRIC RELIEF 10.0 Ib OVERSIZED MOTOR • a �� BELT DRIVE MOTOR a Liffe. �1 POWER EXHAUST 74::. �Jl/�� THROUGHT THE BASE ELECTRICAL(FIOPS) r . ._._. . -..m__- .. _ a UNIT MOUNTED CIRCUIT BREAKER(FIOPS) � UNIT MOUNTED DISCONNECT(FIOPS) POWERED CONVENIENCE OUTLET(FIOPS) . HINGED DOORS(FIOPS) eif O HAIL GUARD SMOKE DETECTOR,SUPPLY!RETURN PACKAGED GAS!ELECTRICAL NovAR CONTROL CORNER WEIGHT STAINLESS STEEL HEAT EXCHANGER REHEAT ROOF CURB 78.0 lb BASIC UNIT WEIGHTS CORNER WEIGHTS CENTER OF GRAVITIY SHIPPING NET AO 265.0 lb © 173.0 lb (E)LENGHT (F)WIDTH 990.0 lb 847.0 b BO 249.0 lb O 160.0 lb 46" 21" NOTE: 1.CORNER WEIGHTS ARE GIVEN FOR INFORMATION ONLY. 2.TO ESTIMATE SHIPPING WEIGHT ADD 5 LBS TO NET WEIGHT. t- 3.BASIC UNIT WEIGHT DOES NOT INCLUDE ACCESSORY WEIGHT.TO OBTAIN TOTAL WEIGHT,ADD ACCESSORY NET WEIGHT TO BASIC UNR WEIGHT i ''''-'2'...%' 4..WEIGHTS FOR OPTIONS NOT LISTED ARE>5 LBS. ''''''''''''' ''' ''''''17.:111I''' - 4.- ,----- ,,,.,..',. 1040� EF ;: �`a�/ .„ PACKAGED GAS!ELECTRICAL II 1 RIGGING AND CENTER OF GRAVITY • . . . 0 TRAM' CLEARANCE FROM TOP OF UNIT 72" • CLEARANCE 36" • CLEARANCE 48" --' ;:.----...------ ----) 1 44))) ' 7' NIL ,1 till RETURN DOWN FLOW CLEARANCE 36' HORIZONTAL CLEARANCE 18" - CLEARANCE 36" PACKAGED GAS/ELECTRIC CLEARANCE ROOF OPENING I ' I 7 UNIT OUTLINE�°I I 46' 53 1/4" 1 I I 1 1 L:L--- 46" ------el 1 88 5/8" PACKAGED GAS/ELECTRIC DOWNFLOW TYPICAL ROOF OPENING • 0 . • Downflow Duct Connections-Field Fabricated All Flanges- 1 1/4" • /.17 3/4" 333/4" <- 40111111111 / 17 3/4" I I 33 3/4" I I I I I I I I I I I I do.00071...:10,11,0 I 411111141440,•. 0. • • ACCESSORY-DUCT CONNECTIONS • • TRANE 4444%44>%°,44.4%*%‘'' -f I CONOMIZER HOOD BAROMETRIC RELIEF HOOD BAROMETRIC RELIEF HOOD 7 3/4" 12" ACCESSORY-BAROMETRIC RELIEF DAMPER HOOD 'None IIW . 0 MANE' . 11%%"'illits, i......N ''''\-,,, ... \ . • ' CONOMIZER HOOD CONOMIZER HOOD 6 7B" II 00 1111111.1 MOM 00 ¢ • 16 314" ACCESSORY-ECONOMIZER HOOD Page 11 • TRANE • General The units shall be convertible airflow. The operating range shall be between 115°F and 0°F incooling as standard from the factory for units with microprocessor controls. Operating range for units with electromechanical controls shall be between 115°F and 40°F. Cooling performance shall be rated in accordance with ARI testing procedures. All units shall be factory assembled, internally wired, fully charged with R-410A, and 100 'percent run tested to check cooling operation,fan and blower rotation, and control sequence before leaving the factory. Wiring internal to the unit shall be colored and numbered for simplified identification. Units shall be cULus listed and labeled,classified in accordance for Central Cooling Air Conditioners. Casing Unit casing shall be constructed of zinc coated, heavy gauge, galvanized steel. Exterior surfaces shall be cleaned, phosphatized, and finished with a weather-resistant baked enamel finish. Unit's surface shall be tested 672 hours in a salt spray test in compliance with ASTM B117. Cabinet construction shall allow for all maintenance on one side of the unit. Service panels shall have lifting handles and be removed and reinstalled by removing two fasteners while providing a water and air tight seal. All exposed vertical panels and top covers in the indoor air section shall be insulated with a cleanable foil-faced, fire-retardant permanent, odorless glass fiber material. The base of the unit shall be insulated with 1/8 inch, foil-faced, closed-cell insulation. All insulation edges shall be either captured or sealed. The unit's base pan shall have no penetrations within the perimeter of the curb other than the raised 1 1/8 inch high downflow supply/return openings to provide an added water integrity precaution, if the condensate drain backs up. The base of the unit shall have provisions for forklift and crane lifting, with forklift capabilities on three sides of the unit. Unit Top The top cover shall be one piece construction or, where seams exist, it shall be double-hemmed and gasket-sealed. The ribbed top adds extra strength and enhances water removal from unit top. Filters Throwaway filters shall be standard on all units. Optional 2-inch MERV 7 and MERV 13 filters shall also be available. Compressors All units shall have direct-drive, hermetic, scroll type compressors with centrifugal type oil pumps. Motor shall be suction gas-cooled and shall have a voltage utilization range of plus or minus 10 percent of unit nameplate voltage. Internal overloads shall be provided with the scroll compressors. Crankcase heaters shall be included on 6-10 ton units. Dual compressors are outstanding for humidity control, light load cooling conditions and system back-up applications. Dual compressors are available on 71/2-10 ton models and allow for efficient cooling utilizing 3-stages of compressor operation for all high efficiency models. Indoor Fan The following units shall be equipped with a direct drive plenum fan design (T/YSC120E,T/YHC092,102, 120E). Plenum fan design shall include a backward-curved fan wheel along with an externalrotor direct drive variable speed indoor motor. All plenum fan designs will have a variable speed ' adjustment potentiometer located in the control box. 3-5 ton units (standard efficiency 3-phase or high efficiency 3-phase with optional motor) are belt driven, FC centrifugal fans with adjustable motor sheaves. 3-5 ton units (1-phase or high efficiency 3-phase) have multispeed, direct drive motors. All 6-81/2 ton units (standard efficiency) shall have belt drive motors with an adjustable idler-arm assembly for quick-adjustment to fan belts and motor sheaves. All motors shall be thermally protected. All 10 tons and 71/2-81/ (high efficiency) have variable speed direct drive motors. All indoor fan motors meet the U.S. Energy Policy Act of 1992 (EPACT). Outdoor Fans The outdoor fan shall be direct-drive,statically and dynamically balanced, draw-through in the vertical discharge position. The fan motor shall be permanently lubricated and shall have built-in thermal overload protection. Evaporator and Condenser Coils Internally finned, 5/16"copper tubes mechanically bonded to a configured aluminum plate fin shall be standard.The microchannel type condenser coil is standard for the T/YSC 10 ton models and 71/2 ton high efficiency models. The microchannel type condenser coil is not offered on the 71 ton dehumidification model. Due to flat streamlined tubes with small ports, and metallurgical tube-tofin bond, microchannel coil has better heat transfer performance. Microchannel condenser coil can reduce system refrigerant charge by up to 50% because of smaller internal volume, which leads to better compressor reliability. Compact all-aluminum microchannel coils also help to reduce the unit weight. All-aluminum construction improves re-cyclability. Galvanic corrosion is also minimized due to allaluminum construction. Strong aluminum brazed structure provides better fin protection. In addition, flat streamlined tubes also make microchannel coils more dust resistant and easier to clean. Coils shall be leak tested at the factory to ensure the pressure integrity. The evaporator coil and condenser coil shall be leak tested to 600si . The assembled 9 unit shall Timm be leak tested to 465 psig. The condenser coil shall have a patent pending 1+1+1 hybrid coil designed with slight gaps for ease of cleaning. A removable, reversible, double-sloped condensate drain pan with through the base condensate drain is standard. Controls • Unit shall be completely factory-wired with necessary controls and contactor pressure lugs or terminal block for power wiring. Unit shall provide an external location for mounting a fused disconnect device. A choice of microprocessor or electromechanical controls shall be available. Microprocessor controls provide for all 24V control functions. The resident control algorithms shall make all heating, cooling, and/or ventilating decisions in response to electronic signals from sensors measuring indoor and outdoor temperatures. The control algorithm maintains accurate temperature control, minimizes drift from set point, and provides better building comfort. A centralized microprocessor shall provide anti-short cycle timing and time delay between compressors to provide a higher level of machine protection. 24-volt electromechanical control circuit shall include control transformer and contactor High Pressure Control All units include High Pressure Cutout as standard. Phase monitor Phase monitor shall provide 100% protection for motors and compressors against problems caused by phase loss, phase Imbalance, and phase reversal. Phase monitor is equipped with an LED that provides an ON or FAULT indicator. There are no field adjustments. The module will automatically reset from a fault condition. Refrigerant Circuits Each refrigerant circuit offer thermal expansion valve as standard. Service pressure ports, and refrigerant line filter driers are factory-installed as standard. An area shall be provided for replacement suction line driers. Gas Heating Section The heating section shall have a progressive tubular heat exchanger design using stainless steel burners and corrosion resistant steel throughout. An induced draft combustion blower shall be used to pull the combustion products through the firing tubes. The heater shall use a direct spark ignition (DSI)system. On initial call for heat,the combustion blower shall purge the heat exchanger for 20 seconds before ignition After three unsuccessful ignition attempts, the entire heating system shall be locked out until manually reset at the thermostat/zone sensor. Units shall be suitable for use with natural gas or propane (field-installed kit) and also comply with the California requirement for low NOx emissions (Gas/Electric Only). Economizer This accessory shall be available with or without barometric relief. The assembly includes fully modulating 0-100 percent motor and dampers, minimum position setting, preset linkage, wiring harness with plug, spring return actuator and fixed dry bulb control. The barometric relief shall provide a pressure operated damper that shall be gravity closingand shall prohibit entrance of outside air during the equipment off cycle. Optional solid state or differential enthalpy control shall be available for either factory or field installation.The economizer arrives in the shipping position and shall be moved to the operating position by the installing contractor. Accessory-Roof Curb The roof curb shall be designed to mate with the unit's downflow supply and return and provide support and a water tight installation when installed properly.The roof curb design shall allow field fabricated rectangular supply/return ductwork to be connected directly to the curb. Curb design shall comply with NRCA requirements. Curb shall be shipped knocked down for field assembly and shall include wood nailer strips. n... ,o