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SERVICE AND MAINTENANCE SUGGESTIONS
Call Serviceman
GENERAL: All furnaces have been fire-tested to check for proper
operation. This includes, main burner flame, pilot flame, fan operation,
fan control, limit control and valve operation. If the furnace fails to
function on initial installation, it is advisable to re-check the following:
1.
115 volts to the junction box.
2.
Inlet gas pressure.
3.
The 24 volt system.
4.
Type of gas being used and that shown on the rating label.
STANDING PILOT MODEL
Servicing the Pilot and Main Burners, Pilot Orifice, Thermo-
couple, and Main Burner Orifices: Disconnect the gas supply at
the inlet to the control valve. Then remove the burner door to gain
access to the above listed components.
IF ELECTRODE DOES NOT PRODUCE SPARK:
1. Check wire connections.
2. Check gap for pilot burner to the electrode tip. Should be between
1/8" (3mm) and 3/16" (5mm). Electrode wire and tip must be
more than 1/4" (6mm) away from all other metal components.
IF PILOT DOES NOT LIGHT BY ANY MEANS:
1. Check valve knob for being in the "Pilot" position.
2. Check pilot adjustment for being full open (counterclockwise
to open).
3. If gas is available in the supply tubing, the pilot orifice and/or
pilot burner is probably restricted by a spider web. Clean pilot
assembly and relight.
IF PILOT DOES NOT REMAIN ON AFTER RELEASING KNOB:
1.
Follow instructions and hold button down longer and harder.
2. Determine if pilot flame extends past thermocouple; if not, adjust
input or clean pilot burner.
3.
Replace thermocouple if millivolts read less than 15 millivolts.
MAIN GAS VALVE DOES NOT OPEN WHEN GAS CONTROL IS
TURNED TO ON:
1. Check for 24 volts to valve by removing one wire and touching
to the SAME TERMINAL it was on. Terminal should have a
light spark. DO NOT SHORT ACROSS TERMINALS, AS IT
WILL BURN OUT THE GAS CONTROL.
2. To check for line voltage to furnace, remove front panel and
short across two-terminal fan control to allow fan to operate
Figure 14.
Label all wires prior to disconnection when servicing controls.
Wiring errors can cause improper and dangerous operation.
Verify proper operation after servicing.
IP-MODEL PILOT
This heater is using a Honeywell "Smart Valve" system for intermittent
pilot ignition.
On a call for heat by the control turns on a 24 volt mini hot surface
ignitor which lights a pilot that in turn lights the main burner. The gas
valve used in this system is a step opening which opens at a lower
pressure for ignition and then steps to a full inlet pressure of 4" H
pressure on Natural Gas and 10" H
PILOT FLAME ADJUSTMENT
The pilot flame should envelop 3/8 to 1/2 inch (10 to 13mm) of the
tip of the flame rod. See Figure 10.
37134-6-0520
CAUTION
0 pressure on Propane Gas.
2
TO ADJUST:
1.
Remove the pilot adjustment cover screw.
2. Turn the inner adjustment screw clockwise
or counterclockwise
justment is shipped at full flow rate. Turn the inner adjustment
screw clockwise
3.
Replace the cover screw after the adjustment to prevent gas
leakage.
PRESSURE REGULATOR
ADJUSTMENT-UNDER CAP
SCREW
INLET PRESSURE TAP
TO 24 V."HOT" ON TRANSFORMER
L2 NEUTRAL
VALVE CONTROL
CONNECTOR
HONEYWELL IP
SMART VALVE
LADDER WIRING DIAGRAM-IP VALVE
O
2
to increase pilot flame. Pilot ad-
if the inlet pressure is too high.
OUTLET PRESSURE TAP
PILOT ADJUSTMENT-
UNDER CAP SCREW
GAS FLOW
IGNITOR
PILOT OUTLET
OFF
ON
CONTROL
IGNITOR-PILOT ASSY.
WIRING
IGNITOR
TO 24 V. THERMOSTAT
CONTROL
TO 24 V. COMMON ON TRANSFORMER
I P-MODEL GAS VALVE AND WIRING
L1 "HOT"
120 VAC
FAN
SWITCH
MOTOR
120VAC
40 VA TRANSFORMER
24 VAC
LIMIT
CONTROL
THERMOSTAT
VENT SAFETY
LIMIT
Figure 15
to decrease
Page 11
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