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59TP5A!CAUTIONFURNACE OVERHEATING HAZARDFailure to follow this caution may result in shortenedfurnace life.Set air temperature rise within limits specified on the ratingplate to prevent reduced life of furnace components.!CAUTIONFURNACE DAMAGE HAZARDFailure to follow this caution may result in overheating theheat exchangers or condensing flue gases in heat exchangerareas not designed for condensate.Temperature rise must be within limits specified on unitrating plate.!CAUTIONUNIT DAMAGE HAZARDFailure to follow this caution may result in componentdamage.Temperature rise must be within limits specified on furnacerating plate. Recommended operation is at midpoint of riserange or slightly above.Place SW -1 (LHT) in ON position. Jumper R to W/W1 and W2 tocheck high -gas -heat temperature rise. To check low -gas -heattemperature rise, remove jumper to W2. Determine air temperaturerise for both high and low gas heat. Do not exceed temperature riseranges specified on unit rating plate for high and low gas heat.This furnace must operate within the temperature rise rangesspecified on the furnace rating plate. Determine the air temperatureas follows:a. Placeduct thermometersin return and supply ducts ascloseto furnace as possible. Be sure thermometers do not “see”heat exchangers so that radiant heat does not affectthermometer readings. This is particularly important withstraight run ducts.b. When thermometer readings stabilize, subtract return -airtemperature from supply -air temperature to determinetemperature rise.If the temperature rise is outside this range, check the following:a. Gas input for low -and high gas heat operation.b. Derate for altitude if applicable.c. Return and supply ducts for excessive restrictions causingstatic pressures greater than 0.50 -in. w.c.d. Adjust temperature rise by adjusting blower speed.S Increase blower speed to reduce temperature rise.S Decrease blower speed to increase temperature rise.! WARNINGELECTRICAL OPERATION HAZARDFailure to follow this warning could result in personal injuryor death.Disconnect 115v electrical power before changing speed tap.Table 16 – Blower Speed TapsFACTORY ATTACHEDCOLOR SPEEDTO:Gray 5 CoolYellow 4 SpareBlue 3 HI HTOrange 2 SpareRed 1 LO HT/Cont FanFor low -heat, the following connections can be made at LO -HTon control:a. Speed 2 (Orange)b. Speed 1 (Red) - Factory Setting(Read following caution before changing taps).!CAUTIONUNIT DAMAGE HAZARDTo avoid operating outside the rise range and avoidcomponent damage:1. NEVER connect Speed Tap 1 (Red) wire to “HI HT.”2. NEVER connect Speed Tap 2 (Orange) wire to “HI HT” onall models.To change blower motor speed selections for heating mode,remove blower motor lead from control HI-HT terminal. (See Fig.35.) Select desired blower motor speed lead from one of the othermotor leads and relocate it to HI -HT terminal. (See Table 16 forlead color identification.) Reconnect original lead on SPAREterminal. Follow this same procedure for proper selection ofLO -HT and COOL speed selection.Adjust Blower Off Delay (Heat Mode)If desired, the main blower off time delay period may belengthened or shortened when operating in the heating mode toprovide greater comfort. For position of switches see Fig. 35 andFig.63 for location of switches on control center.a. Remove blower door if installed.b. Turn Setup switch SW-2 and SW-3 ON or OFF fordesired blower off delay. See Table 18 and Fig. 35 andFig 63.Adjust Cooling AirflowThe cooling airflow can be set from the remaining blower speedtaps. Refer to the Air Delivery Tables in these instructions.If a two stage air conditioning or heat pump is installed, the LowCooling Speed is the same speed tap as the Lo Heat speed.Adjust Continuous Fan AirflowThe Continuous Fan airflow can be set from the remaining blowerspeed taps. Refer to the Air Delivery Tables in these instructions.The Continuous Fan speed can be changed to any other speed tapby toggling the Fan switch at the thermostat. See the Sequence ofOperation for details.! WARNINGFIRE HAZARDFailure to follow this warning could result in personalinjury, death, and/or property damage.Reinstall manifold pressure tap plug in gas valve to preventgas leak.60
!CAUTIONFURNACE OVERHEATING HAZARDFailure to follow this caution may result in reduced furnacelife.Recheck temperature rise. It must be within limits specifiedon the rating plate. Recommended operation is at themid -point of rise range or slightly above.c. Proceed to “Set Blower Off Delay” before installingblower door.Adjust Thermostat Heat Anticipatora. Mechanical thermostat. Set thermostat heat anticipator tomatch the amp. draw of the electrical components in theR -W/W1 circuit. Accurate amp. draw readings can be obtainedat the wires normally connected to thermostat subbaseterminals, R and W. The thermostat anticipator shouldNOT be in the circuit while measuring current.(1.) Set SW-1 (LHT) switch on furnace control boardto ON.(2.) Remove thermostat from subbase or from wall.Check Safety ControlsThe flame sensor, gas valve, and pressure switch were all checkedin the Start-up procedure section as part of normal operation.1. Check Main Limit SwitchThis control shuts off combustion system and energizes aircirculatingblower motor, if furnace overheats. By using thismethod to check limit control, it can be established that limitis functioning properly and will operate if there is a restrictedreturn -air supply or motor failure. If limit controldoes not function during this test, cause must be determinedand corrected.a. Run furnace for at least 5 minutes.b. Gradually block off return air with a piece of cardboard orsheet metal until the limit trips.c. Unblock return air to permit normal circulation.d. Burners will re-light when furnace cools down.2. Check Pressure Switch(es)This control proves operation of the draft inducer blower.a. Turn off 115 -v power to furnace.b. Disconnect inducer motor lead wires from wire harness.c. Turn on 115 -v power to furnace.d. Set thermostat to “call for heat” and wait 1 minute. Whenpressure switch is functioning properly, hot surface ignitershould NOT glow and control diagnostic light flashes astatus code 32. If hot surface igniter glows when inducermotor is disconnected, shut down furnace immediately.e. Determine reason pressure switch did not function properlyand correct condition.f. Turn off 115 -v power to furnace.g. Reconnect inducer motor wires, replace outer door, andturn on 115 -v power.h. Blower will run for 90 seconds before beginning the callfor heat again.i. Furnace should ignite normally.Checklist1. Put away tools and instruments. Clean up debris.2. Verify that the jumper is removed from the TEST/TWINterminal. Verify that there is nothing plugged into the PLTconnector. (Note: If there is a jumper connector pluggedinto PLT, remove it and discard.) See Figure (insert circuitboard layout figure number).3. Verify that Heating Operating Mode switch SW-1 is setproperly. See Figure (insert circuit board layout figurenumber).4. Verify that the Blower/Heat Off Delay SW-2 and SW-3switches are set as desired. See Figure (insert circuit boardlayout figure number).5. Verify that the blower and control (“Main”) doors areproperly installed.1/2” NPT Inlet1/8” NPT InletPressure TapON/OFF SwitchTWO-STAGEFig. 51 - Gas ValveRegulator Seal CapRegulator AdjustmentRegulator Seal Cap under Cap1/8” NPT ManifoldPressure Tap1/2” NPT OutletA1115259TP5A61
Page 3 and 4:
SAFETY CONSIDERATIONS! WARNINGFIRE,
Page 5 and 6:
6. Before removing a new control fr
Page 7 and 8:
!LOCATIONCAUTIONPERSONAL INJURY AND
Page 9 and 10: Fig. 4 - Prohibited InstallationsA1
Page 11: FURNACEINPUT(BTUH)Table 3 - Minimum
Page 14 and 15: Remove pressure switch tube fromfro
Page 16 and 17: 5If alternate vent positionis requi
Page 18 and 19: INSTALL CLAMPS ON DRAIN TUBEATTACH
Page 20 and 21: 59TP5AINSTALLATIONUpflow Installati
Page 22 and 23: FURNACE CASING WIDTH14---3/16 (360)
Page 24 and 25: FURNACE(OR COIL CASINGWHEN USED)FUR
Page 26 and 27: 59TP5AANY COMBINATION OF 1, 2, OR 3
Page 28 and 29: 59TP5AAIR DUCTSGeneral Requirements
Page 30 and 31: NOMINALIRON PIPESIZEIN. (MM)Table 8
Page 32 and 33: 59TP5A8. Attach furnace J-Box cover
Page 34 and 35: 1To Humidifier LeadsTo HUM Terminal
Page 36: NOTES FOR THERMOSTAT WIRING DIAGRAM
Page 39 and 40: Allowable vent and combustion air t
Page 41 and 42: 6. Tighten the clamp around the out
Page 43 and 44: Table 12 - Maximum Allowable Expose
Page 45 and 46: Table 15 - Maximum Equivalent Vent
Page 47 and 48: 76Any other unusedknockout may be u
Page 49 and 50: Rotate vent elbow torequired positi
Page 51 and 52: HORIZONTAL RIGHT -VERTICAL VENT CON
Page 53 and 54: VV59TP5AItem Clearance Description
Page 55 and 56: Roof T e rm ination (Pref erred)At
Page 57 and 58: Ventilated CombustionAir intake pip
Page 59: In Canada, the input rating must be
Page 63 and 64: 59TP5AFig. 54 - Service Label Infor
Page 65 and 66: U.S.A. and CanadaU.S.A. Only U.S.A.
Page 67 and 68: SERVICE AND MAINTENANCEPROCEDURES!
Page 69 and 70: !CAUTIONCUT HAZARDFailure to follow
Page 71 and 72: fully seated forward in the burner
Page 73 and 74: NOTE: No thermostat signals may be
Page 75 and 76: 59TP5AFig. 60 - Blower AssemblyA113
Page 77 and 78: the high -heat pressure switch HPS
Page 79 and 80: memory to be automatically used fol
Page 81 and 82: 11 NO PREVIOUS CODE - Stored codes
Page 83 and 84: PARTS REPLACEMENT INFORMATION GUIDE
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