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IV. FIELD CONNECTIONS A. External Trap Condensate Drain 3 The unit’s ⁄4-in. condensate drain connections are located at the bottom and side of the unit. Unit discharge connec- tions do not determine the use of drain connections; either drain connection can be used with vertical or horizontal applications. When using the standard side drain connection, make sure the plug in the alternate bottom connection is tight before installing the unit. To use the bottom drain connection for a roof curb inst
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Table 2 — Maximum Gas Flow Capacity of Pipe in Cubic Ft of Gas Per Hour for Gas Pressures of 0.5 Psig or Less and a Pressure Drop of 0.5 in. wg (Based on a 0.60 Specific Gravity Gas) NOMINAL LENGTH OF PIPE, FT* INTERNAL IRON PIPE DIAMETER SIZE (in.) 10 20 30 40 50 60 70 80 90 100 125 150 175 200 (in.) 1 ⁄2 .622 175 120 97 82 73 66 61 57 53 50 44 40 — — 3 ⁄4 .824 360 250 200 170 151 138 125 118 110 103 93 84 77 72 1 1.049 680 465 375 320 285 260 240 220 205 195 175 160 145 135 1 1 ⁄4 1.380 1400 95
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Liquid Propane CAUTION: Whentheductsystemfasteningholesare Unitsareshippedforusewithnaturalgas,butmaybefield- being drilled into the side of the unit for duct flanges, convertedforusewithliquidpropanewithaccessoryLP(liq- be careful not to puncture the coil or coil tubes. See uid propane) kit. Fig. 12. All LP gas equipment must conform to NFPA safety 3. Useflexibletransitionbetweenrigidductworkandunit standards. topreventtransmissionofvibration.Thetransitionmay LPgaspressureattheunitmustnotbelesstha
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3. Voltagetocompressorterminalsduringoperationmust 4. Insulate low-voltage wires for highest voltage con- bewithinvoltagerangeindicatedonunitnameplate(also tainedwithinconduitwhenlow-voltagecontrolwiresare see Tables 3A and 3B). On 3-phase units, voltages be- run in same conduit as high-voltage wires. tweenphasesmustbebalancedwithin2%andthecur- 5. Donotdamageinternalcomponentswhendrillingthrough rent within 10%. Use the formula shown in Tables 3A any panel to mount electrical hardware, conduit,
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High-Voltage Connections (Fig. 13) Laboratories) approved copper connector. Install con- duit connectors in side panel power supply knockout Theunitmusthaveaseparateelectricalservicewithafield- openingsindicatedinFig.2.Routepowerlinesthrough supplied,waterproof,fuseddisconnectswitchmountedat,or connector to unit control box. within sight from the unit. Refer to the unit rating plate for maximumfuse/circuitbreakersizeandminimumcircuitamps Special Procedures for 208-V Operation (ampacity) for wire
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Table 3B — Electrical Data (Units with Electrical Convenience Outlet) MINIMUM UNIT VOLTAGE COMBUSTION POWER SUPPLY NOMINAL COMPRESSOR OFM IFM DISCONNECT UNIT RANGE FAN MOTOR WITH OUTLET VOLTAGE SIZE* 581B (V-Ph-Hz) Min Max RLA LRA FLA FLA FLA MCA MOCP† FLA LRA 208/230-1-60 187 254 16.0 88.0 0.7 4.9 .57 31.6/31.66 40/40 30/30 106/106 208/230-3-60 187 254 10.3 77.0 0.7 4.9 .57 24.5/24.5 30/30 24/24 95/ 95 036 (3 Tons) 460-3-60 414 508 5.1 39.0 0.4 2.2 .30 14.6 20 14 59 575-3-60 518 632 4.2 31.0 0.
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HeatAnticipator Setting The room thermostat heat anticipator must be properly ad- justed to ensure proper heating performance. Set the heat anticipator, using an ammeter to determine the exact re- quired setting. NOTE: For thermostat selection purposes, use .14 amp for the approximate required setting. Set heat anticipator stage 1 and 2 at .14 amp. Failure to make a proper heat anticipator adjustment may result in improper operation, discomfort to the occupants of theconditionedspace,andineffici
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ECONOMIZER CONTROL BOARD BAROMETRIC RELIEF DAMPER ECONOMIZER PLUG ECONOMIZER MOTOR Fig. 19 — Horizontal Varislide™ Economizer Installation EXAMPLE: Given: (90 Degree Rotation) Negative Pressure ...........................0.2in.wg OutdoorAir .................................900cfm Determine — Setting—5in. Fig. 22 — Varislide Economizer Minimum Position Setting 8. Remove tape from outdoor-air thermostat (OAT). Fas- tenOATtoinsideofhoodusingscrewsandspeedclips provided. See Fig. 23. Make sure OAT t
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3 75 80 198818A TR1 1 ENTHALPY CONTROL 2 85 60 65 70 50 CONTACTS SHOWN IN HIGH ENTHALPY OR UNPOWERED STATE CONTACT RATINGS: 1.5A RUN, 3.5A IN RUSH AT 24VAC 3 mA MIN. AT 11 VDC CW–SETPOINTS–CCW DAMPER CLOSED DAMPER OPEN OUTDOOR TEMP. °F TR 55 24VAC REV. B TR B C SO D S 5 1 2 MINIMUM 3 4 POSITION T T1 OPEN P P1 D C B A % H 90 U 70 M I D 60 I 30 T Y 10 LEGEND OAT — Outdoor-Air Thermostat NOTE: See unit wiring diagram for details. Fig. 24 — Wiring Connections for Outdoor-Air Thermostat Fig. 25 — V
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d. After installation is complete, calculate the mini- Use this equation to determine cfm , which is the 1 mumairflowacrosstheeconomizer.Tocalculatethe minimum airflow across the economizer. minimum airflow, the following data is needed: (T −T ) cfm 3 2 3 cfm = total cfm (cfm ), temperature of the total cfm (T ), 1 3 3 (T −T) 1 2 temperature of the return air (T ), and tempera- 2 If cfm does not match the desired minimum air- ture of the entering outside air (T ). Cfm is the 1 1 1 flow from Step 1,
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refrigerant leak. Leak-test all refrigerant tubing connectionsusingelectronicleakdetector,halidetorch, or liquid-soap solution. If refrigerant leak is de- tected, see Refrigerant Leaks section on page 30. c. Inspect all field- and factory-wiring connections. Be sure that connections are completed and tight. d. Inspectcoilfins.Ifdamagedduringshippingandhan- dling, carefully straighten fins with a fin comb. 4. Verify the following conditions: DANGER: Do not purge gas supply into the com- bustionchambe
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II. HEATING SECTION START-UPAND ADJUSTMENTS The evaporator-fan OFF delay can also be modified. Once the call for heating has ended, there is a 10 minute period during which the modification can occur. If the limit switch CAUTION: Complete the required procedures given trips during this period, the evaporator-fan OFF delay will inthePre-Start-Upsectiononthispagebeforestarting increase by 15 seconds.Amaximum of 9 trips can occur, ex- unit. tending the evaporator-fan OFF delay to 180 seconds. To rest
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Table 5 — Rated Gas Inputs at Indicated Manifold Pressures GAS SUPPLY PRESSURE MANIFOLD NATURAL GAS PROPANE* NUMBER (in. wg) PRESSURE UNIT OF (in. wg) 581B Natural Propane Orifice Heating Input Orifice Heating Input ORIFICES Drill Size (Btuh)† Drill Size (Btuh)† Min Max Min Max Natural Propane 2 4.0 13.6 5.0 13.0 3.5 3.5 33 72,000 43 72,000 036-072** 3 4.0 13.6 5.0 13.0 3.5†† 3.5†† 33 115,000†† 43 115,000†† 3 5.0 13.6 5.0 13.0 3.5\ 3.5\ 30 150,000\ 38 150,000\ *When a 581B unit is converted to liq
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NOTE: Thegasmanifoldisequippedwithapluglocatedap- H. Safety Check of Limit Control proximately5in.downfromthegasvalvewhichmayalsobe Limit control is located on the deck next to the evaporator used to connect the manometer. fan. The control shuts off the gas supply and energizes 4. Turn on gas to unit. the evaporator-fan motor and inducer motor if the unit overheats. 5. Remove cover screw over regulator adjustment screw on gas valve. See Fig. 31. Therecommendedmethodofcheckingthislimitcontrolisto
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installation, start-up
581B
and service instructions
Sizes 036-072
3to6Tons
SINGLE PACKAGE ROOFTOP
GASHEATING/ELECTRICCOOLINGUNITS
Cancels: II 581B-36-1 II 581B-36-2
9/15/98
IMPORTANT — READ BEFORE INSTALLING
1. Read and become familiar with these installation in-
structions before installing this unit (Fig. 1).
2. Be sure the installation conforms to all applicable local
and national codes.
3. Theseinstructionscontainimportantinformationforthe
proper maintenance and repair of this equipment. Re
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STANDARD VARISLIDE™ CORNER CORNER CORNER CORNER CONNECTION SIZES UNIT ECONOMIZER WEIGHT WEIGHT WEIGHT WEIGHT UNIT 3 A 1 ⁄89 Dia. [35] Field Power Supply Hole WEIGHT WEIGHT ‘‘A’’ ‘‘B’’ ‘‘C’’ ‘‘D’’ 581B B 29 Dia. [51] Power Supply Knock-Out Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg 3 C 1 ⁄49 Dia. [44] Charging Port Hole 036 530 240 34 15.4 127 57.6 122 55.3 138 62.6 143 64.9 7 D ⁄89 Dia. [22] Field Control Wiring Hole 048 540 245 34 15.4 129 58.5 124 56.2 141 64.0 146 66.2 3 E ⁄49-14 NPT Condensate Drai
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INSTALLATION Minimum clearance of condenser coil is 36 in. on one side, 12 in. the other. Side getting greater clearance is optional. Unit is shipped in the vertical airflow configuration. See Fig. 1. To convert to horizontal discharge, remove horizontal Minimum distance overhead is 60 inches. duct opening covers. Using the same screws, install covers Locatetheunitwheretheventcapwillbeaminimumof4ft withinsulation-sidedown(facingoutside)ontheunitonver- from openable windows and doors. ticalductopen
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NOTES: ROOF CURB ‘‘A’’ UNIT SIZE 1. Roof curb accessory is shipped ACCESSORY disassembled. 149 2. Insulated panels. CRRFCURB001A00 [356] 3. Dimensions in [ ] are in millimeters. 581B036-072 4. Roof curb: galvanized steel. 249 CRRFCURB002A00 5. Attachductworktocurb(flangesofduct [610] rest on curb). 6. Service clearance 4 ft on each side. 7. Direction of airflow. SERVICE PLATE SIZES CONNECTOR UNIT ‘‘D’’Alt PACKAGE ‘‘E’’ ‘‘F’’ ‘‘G’’ 581B ‘‘B’’ ‘‘C’’ Drain ACCESSORY Gas Power Control Hole 314213-204
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NOTE: Connection must be made to roof curb before unit is set in place. III. RIG AND PLACE UNIT Inspect unit for transportation damage. File any claim with transportation agency. Keep unit upright and do not drop. MAXIMUMALLOWABLE Spreader bars are not required if top crating is left on unit. DIFFERENCE (in.) Rollers may be used to move unit across a roof. Level by us- A-B B-C A-C ing unit frame as a reference. See Table 1 and Fig. 6 for ad- 0.5 1.0 1.0 ditional information. Operating weight is
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Table 1 — Specifications BASE UNIT 581B 036 048 060 072 NOMINAL CAPACITY (tons) 3 456 OPERATING WEIGHT (lb) Unit 530 540 560 615 With Economizer 564 574 594 649 Roof Curb 115 115 115 115 COMPRESSOR Scroll Quantity 1 111 Oil (oz) 42 53 50 60 REFRIGERANT TYPE R-22 Operating Charge (lb-oz) 5-8 8-6 10.0 9-10 CONDENSER FAN Propeller Quantity...Diameter (in.) 1...22 1...22 1...22 1...22 Nominal Cfm 3000 3000 4000 4000 1 1 1 1 Motor Hp...Rpm ⁄8...825 ⁄8...825 ⁄4...1100 ⁄4...1100 Watts Input (Total) 180
