37
Gas Valve
All unit sizes are equipped with 2-stage gas valves. See Fig. 48 for
locations of adjustment screws and features on the gas valves.
Fig. 48 — Gas Valve
ADJUSTING GAS VALVE PRESSURE SETTINGS
CHECK UNIT OPERATION AND MAKE NECESSARY
ADJUSTMENTS
NOTE: Gas supply pressure at gas valve inlet must be within
specified ranges for fuel type and unit size. See Tables 9-12.
1. Shut off electrical power supplies to unit and install lock-
out tag.
2. Shut off manual gas shut off valve located on gas supply
line.
3. Remove manifold pressure tap plug from manifold and
connect pressure gage or manometer. See Fig. 46.
4. Turn on electrical supply.
5. Open manual shut off valve, then turn on unit main gas
valve.
6. Set room thermostat to call for heat. Verify high-stage heat
operation before attempting to adjust manifold pressure.
7. When main burners ignite, check all fittings, manifold,
and orifices for leaks.
8. Adjust high-stage pressure to specified setting by turning
the plastic adjustment screw clockwise to increase pres-
sure, counter-clockwise to decrease pressure.
9. Set room thermostat to call for low-stage heat. Adjust low-
stage pressure to specified setting.
10. Replace regulator cover screw(s) when finished.
11. With burner access panel removed, observe unit heating
operation in both high stage and low stage operation.
Observe burner flames to see if they are blue in appear-
ance, and that the flames are approximately the same for
each burner.
12. Turn off unit, close manual gas shut off valve, remove
pressure manometer and replace the
1
/
8
-in. pipe fitting on
the gas manifold. See Fig. 46.
BURNER IGNITION
Unit is equipped with a direct spark ignition 100% lockout system.
Integrated Gas Unit Controller (IGC) is located in the control box.
See Fig. 47. The IGC contains a self-diagnostic LED (light-emit-
ting diode). A single LED (see Fig. 50) on the IGC provides a vi-
sual display of operational or sequential problems when the power
supply is uninterrupted. When a break in power occurs, the IGC
will be reset, resulting in a loss of fault history, and the indoor
evaporator fan ON/OFF times will be reset. The LED error code
can be observed through the viewport. During servicing, refer to
the label on the control box cover or Table 13 for an explanation of
LED error code descriptions.
* A 3 second pa
u
se exists between LED error code flashes. If more
than one error code exists, all applicable codes will be displayed in
n
u
merical se
qu
ence.
If lockout occurs, unit can be reset by interrupting power supply to
unit for at least 5 seconds.
ORIFICE REPLACEMENT
This unit uses orifice type LH32RFnnn (where nnn indicates ori-
fice reference size). When replacing unit orifices, order the neces-
sary parts through the Replacement Components Division (RCD).
See Table 14 for available orifice sizes. See Table 15 and Fig. 50
and 51 for IGC wiring and connections. See Tables 16 and 17 for
orifice sizes for Natural Gas and LP fuel usage at various eleva-
tions above sea level. Never drill or plug orifices for operation.
Check that each replacement orifice is tight at its threads into the
manifold pipe and that orifice projection does not exceed maxi-
mum value. See Fig. 44.
IMPORTANT: Leak check (using a mixture of soapy water
or leak detection fluid) all gas connections including the
main service connection, gas valve, gas spuds, and mani-
fold pipe plug. All leaks must be repaired before firing unit.
PLASTIC ADJUST
SCREW (2)
REGULATOR SPRING (2)
(PROPANE - WHITE
NATURAL - SILVER)
LOW STAGE
GAS PRESSURE
REGULATOR
ADJUSTMENT
MANIFOLD
PRESSURE TAP
INLET
PRESSURE TAP
ON/OFF
SWITCH
REGULATOR
COVER SCREW (2)
NPT INLET
NPT OUTLET
IMPORTANT: Refer to Troubleshooting Tables 18 and 19
for additional information.
Table 13 — LED Error Code Description*
LED INDICATION
ERROR CODE
DESCRIPTION
ON
Normal Operation
OFF
Hardware Failure
2 Flashes
Limit Switch Fault
3 Flashes
Flame Sense Fault
4 Flashes
4 Consecutive Limit Switch Faults
5 Flashes
Ignition Lockout Fault
6 Flashes
Induced-Draft Motor Fault
7 Flashes
Rollout Switch Fault
8 Flashes
Internal Control Fault
9 Flashes
Software Lockout
LEGEND
LED
— Light Emitting Diode
Содержание 581J 17-28 Series
Страница 18: ...18 COOLING CHARGING CHARTS Fig 21 Cooling Charging Chart 15 Ton ...
Страница 19: ...19 Fig 22 Cooling Charging Chart 17 5 Ton ...
Страница 20: ...20 Fig 23 Cooling Charging Chart 20 Ton ...
Страница 21: ...21 Fig 24 Cooling Charging Chart 25 Ton ...
Страница 36: ...36 Fig 47 Unit Control Box IGC Location IGC Board IGC Board Side view Front view ...
Страница 39: ...39 Fig 50 Integrated Gas Control IGC Board RED LED STATUS ...
Страница 45: ...45 Fig 56 RTU Open Overlay for Economizer Wiring ...
Страница 46: ...46 Fig 57 VFD Overlay for W2770 Controller Wiring ...
Страница 84: ...84 Fig B 581J 17 28 Control Diagram 208 230 3 60 460 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 85: ...85 Fig C 581J 17 28 Power Diagram 208 230 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 86: ...86 Fig D 581J 17 28 Power Diagram 460 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 87: ...87 Fig E 581J 17 28 Power Diagram 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 88: ...88 Fig F 581J 17 28 Control Diagram with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 89: ...89 Fig G 581J 17 28 Power Diagram 208 230 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 90: ...90 Fig H 581J 17 28 Power Diagram 460 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 91: ...91 Fig I 581J 17 28 Power Diagram 575 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 92: ...92 Fig J RTU OPEN Wiring Diagram APPENDIX D WIRING DIAGRAMS ...
Страница 93: ...93 Fig K RTU OPEN Wiring Diagram with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...