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38
Gas Valve
All unit sizes are equipped with 2-stage gas valves. See Fig. 49
for locations of adjustment screws and features on the gas
valves.
Fig. 49 — 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. 47.
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
appearance, 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. 47.
BURNER IGNITION
Unit is equipped with a direct spark ignition 100% lockout sys-
tem. Integrated Gas Unit Controller (IGC) is located in the con-
trol box. See Fig. 48. The IGC contains a self-diagnostic LED
(light-emitting diode). A single LED (see Fig. 52) on the IGC
provides a visual 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 pause exists between LED error code flashes. If more
than one error code exists, all applicable codes will be displayed in
numerical se
q
uence.
If lockout occurs, unit can be reset by interrupting power sup-
ply to unit for at least 5 seconds.
ORIFICE REPLACEMENT
This unit uses orifice type LH32RFnnn (where nnn indicates
orifice reference size). When replacing unit orifices, order the
necessary parts through the Carrier Replacement Components
Division (RCD). See Table 14 for available orifice sizes. See
Table 15 and Fig. 51 and 52 for IGC wiring and connections. See
Tables 16 and 17 for orifice sizes for Natural Gas and LP fuel us-
age at various elevations above sea level. Never drill or plug ori-
fices for operation.
Check that each replacement orifice is tight at its threads into
the manifold pipe and that orifice projection does not exceed
maximum value. See Fig. 45.
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
Summary of Contents for WeatherMaster Puron 48HC D17
Page 18: ...18 COOLING CHARGING CHARTS Fig 22 Cooling Charging Chart 15 Ton ...
Page 19: ...19 Fig 23 Cooling Charging Chart 17 5 Ton ...
Page 20: ...20 Fig 24 Cooling Charging Chart 20 Ton ...
Page 21: ...21 Fig 25 Cooling Charging Chart 25 Ton ...
Page 37: ...37 Fig 48 Unit Control Box IGC Location IGC Board IGC Board Side view Front view ...
Page 40: ...40 Fig 51 Typical IGC Wiring Diagram ...
Page 46: ...46 Fig 57 RTU Open Overlay for Economizer Wiring ...
Page 47: ...47 Fig 58 VFD Overlay for W2770 Controller Wiring ...
Page 84: ...84 Fig B 48HC D17 D28 Control Diagram 208 230 3 60 460 575 3 60 ...
Page 85: ...85 Fig C 48HC D17 D28 Power Diagram 208 230 3 60 ...
Page 86: ...86 Fig D 48HC D17 D28 Power Diagram 460 3 60 ...
Page 87: ...87 Fig E 48HC D17 D28 Power Diagram 575 3 60 ...
Page 88: ...88 Fig F 48HC D17 D28 Control Diagram with Humidi MiZer System ...
Page 89: ...89 Fig G 48HC D17 D28 Power Diagram 208 230 3 60 with Humidi MiZer System ...
Page 90: ...90 Fig H 48HC D17 D28 Power Diagram 460 3 60 with Humidi MiZer System ...
Page 91: ...91 Fig I 48HC D17 D28 Power Diagram 575 3 60 with Humidi MiZer System ...
Page 92: ...92 Fig J PremierLink System Control Wiring Diagram 50HE500891 F ...
Page 93: ...93 Fig K PremierLink System Control Wiring Diagram with Humidi MiZer System ...
Page 94: ...94 Fig L RTU OPEN Wiring Diagram ...
Page 95: ...95 Fig M RTU OPEN Wiring Diagram with Humidi MiZer System ...
Page 97: ......