41
MINIMUM HEATING ENTERING AIR TEMPERATURE
When operating on first stage heating, the minimum tempera-
ture of air entering the dimpled heat exchanger is 50°F continu-
ous and 45°F intermittent for standard heat exchangers and
40°F continuous and 35°F intermittent for stainless steel heat
exchangers. To operate at lower mixed-air temperatures, a
field-supplied outdoor-air thermostat must be used to initiate
both stages of heat when the temperature is below the mini-
mum required temperature to ensure full fire operation. Wire
the outdoor-air thermostat OALT (part no. HH22AG106) in se-
ries with the second stage gas valve. See Fig. 61. Set the out-
door-air thermostat at 35°F for stainless steel heat exchangers
or 45°F for standard heat exchangers. This temperature setting
will bring on the second stage of heat whenever the ambient
temperature is below the thermostat set point. Indoor comfort
may be compromised when heating is initiated using low enter-
ing air temperatures with insufficient heating temperature rise.
Fig. 61 — OATL Connections
Troubleshooting Heating System
Refer to Tables 19 and 20 for additional troubleshooting topics.
CTB
W2
Thermo
s
t
a
t
TH1
TH2
W1
W1
W2
OALT
Table 19 — Heating Service Troubleshooting
PROBLEM
CAUSE
REMEDY
Burners Will Not Ignite.
Misaligned spark electrodes.
Check flame ignition and sensor electrode positioning. Adjust as needed.
No gas at main burners.
Check gas line for air, purge as necessary. After purging gas line of air,
allow gas to dissipate for at least 5 minutes before attempting to relight
unit.
Check gas valve.
Water in gas line.
Drain water and install drip leg to trap water.
No power to furnace.
Check power supply, fuses, wiring, and circuit breaker.
No 24-v power supply to control circuit.
Check transformer. Transformers with internal overcurrent protection
require a cool down period before resetting.
Miswired or loose connections.
Check all wiring and wire nut connections.
Burned-out heat anticipator in thermostat.
Replace thermostat.
Broken thermostat wires.
Run continuity check. Replace wires, if necessary.
Inadequate Heating.
Dirty air filter.
Clean or replace filter as necessary.
Gas input to unit too low.
Check gas pressure at manifold. Clock gas meter for input. If too low,
increase manifold pressure, or replace with correct orifices.
Unit undersized for application.
Replace with proper unit or add additional unit.
Restricted airflow.
Clean filter, replace filter, or remove any restrictions.
Blower speed too low.
Use high speed tap, increase fan speed, or install optional blower, as
suitable for individual units.
Limit switch cycles main burners.
Check rotation of blower, thermostat heat anticipator settings, and
temperature rise of unit. Adjust as needed.
Too much outdoor air.
Adjust minimum position.
Check economizer operation.
Poor Flame
Characteristics.
Incomplete combustion (lack of combustion
air) results in: Aldehyde odors, CO, sooting
flame, or floating flame.
Check all screws around flue outlets and burner compartment. Tighten as
necessary.
Cracked heat exchanger.
Overfired unit — reduce input, change orifices, or adjust gas line or
manifold pressure.
Check vent for restriction. Clean as necessary.
Check orifice to burner alignment.
Burners Will Not Turn Off.
Unit is locked into Heating mode for a one
minute minimum.
Wait until mandatory one-minute time period has elapsed or reset power
to unit.
Содержание Preferred 581J04-14
Страница 36: ...36 Fig 60 Integrated Gas Control IGC Board RED LED STATUS ...
Страница 44: ...44 Fig 65 RTU Open Overlay for Economizer Wiring ...
Страница 45: ...45 Fig 66 VFD Overlay for W2770 Controller Wiring ...
Страница 96: ...96 Fig B 581J 04 06 YAC Control Diagram 208 1 60 208 230 3 60 460 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 99: ...99 Fig E 581J 07A B C YAC Control Diagram 208 230 3 60 460 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 100: ...100 Fig F 581J 08 09 YAC Control Diagram 208 230 3 60 460 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 101: ...101 Fig G 581J 11YAC Control Diagram 208 230 3 60 460 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 102: ...102 Fig H 581J 12 YAC Control Diagram 208 230 3 60 460 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 103: ...103 Fig I 581J 04 06 YAC Power Diagram 208 230 1 60 APPENDIX D WIRING DIAGRAMS ...
Страница 104: ...104 Fig J 581J 04 06 YAC Power Diagram 208 230 3 60 460 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 105: ...105 Fig K 581J 04 06 YAC Power Diagram 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 106: ...106 Fig L 581J 07 12D F YAC Power Diagram 208 230 3 60 460 3 60 6 Ton 2 Stage with Cooling APPENDIX D WIRING DIAGRAMS ...
Страница 108: ...108 Fig N 581J 07 12A B C YAC Power Diagram 208 230 3 60 460 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 109: ...109 Fig O 581J 07 12A B C YAC Power Diagram 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 110: ...110 Fig P 581J 08 09 YAC Power Diagram 230 460 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 111: ...111 Fig Q 581J 08 09 YAC Power Diagram 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 112: ...112 Fig R 581J 11 YAC Power Diagram 208 230 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 113: ...113 Fig S 581J 11 YAC Power Diagram 460 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 114: ...114 Fig T 581J 11 YAC Power Diagram 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 115: ...115 Fig U 581J 12 YAC Power Diagram 230 460 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 116: ...116 Fig V 581J 12 YAC Power Diagram 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 117: ...117 Fig W 581J 14 YAC Control Diagram 208 230 3 60 460 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 118: ...118 Fig X 581J 14 YAC Power Diagram 208 230 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 119: ...119 Fig Y 581J 14 YAC Power Diagram 460 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 120: ...120 Fig Z 581J 14 YAC Power Diagram 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 121: ...121 Fig AA 581J 04 06 YAC Control Diagram 230 1 60 230 460 575 3 60 with Dehumidification APPENDIX D WIRING DIAGRAMS ...
Страница 122: ...122 Fig AB 581J 07A B C YAC Control Diagram 230 1 60 230 460 575 3 60 with Dehumidification APPENDIX D WIRING DIAGRAMS ...
Страница 123: ...123 Fig AC 581J 08 09 YAC Control Diagram 230 460 575 3 60 with Dehumidification APPENDIX D WIRING DIAGRAMS ...
Страница 124: ...124 Fig AD 581J 11 YAC Control Diagram 230 1 60 230 460 575 3 60 with Dehumidification APPENDIX D WIRING DIAGRAMS ...
Страница 125: ...125 Fig AE 581J 12 YAC Control Diagram 230 460 575 3 60 with Dehumidification APPENDIX D WIRING DIAGRAMS ...
Страница 126: ...126 Fig AF 581J 04 06 YAC Power Diagram 208 230 1 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 127: ...127 Fig AG 581J 04 06 YAC Power Diagram 230 460 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 128: ...128 Fig AH 581J 04 06 YAC Power Diagram 575 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 129: ...129 Fig AI 581J 07A B C YAC Power Diagram 230 460 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 130: ...130 Fig AJ 581J 07A B C YAC Power Diagram 575 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 131: ...131 Fig AK 581J 08 09 YAC Power Diagram 230 460 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 132: ...132 Fig AL 581J 08 09 YAC Power Diagram 575 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 133: ...133 Fig AM 581J 11 YAC Power Diagram 208 230 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 134: ...134 Fig AN 581J 11 YAC Power Diagram 460 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 135: ...135 Fig AO 581J 11 YAC Power Diagram 575 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 136: ...136 Fig AP 581J 12 YAC Power Diagram 230 460 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 137: ...137 Fig AQ 581J 12 YAC Power Diagram 575 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 138: ...138 Fig AR 581J 14 YAC Control Diagram 230 460 575 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 139: ...139 Fig AS 581J 14 YAC Power Diagram 208 230 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 140: ...140 Fig AT 581J 14 YAC Power Diagram 460 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 141: ...141 Fig AU 581J 14 YAC Power Diagram 575 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 142: ...142 Fig AV YAC Direct Digital System Control Wiring Diagram System 50HE500891 F APPENDIX D WIRING DIAGRAMS ...
Страница 143: ...143 Fig AW RTU Open Wiring Diagram APPENDIX D WIRING DIAGRAMS ...