Empire Comfort Systems DVC-35IP Installation instructions and owner's manual - page 10
Page 10
R-3122
CAUTION: Label all wires prior to disconnection when
servicing controls. Wiring errors can cause improper and
dangeros 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 thermostat this 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
2
O pressure on Natural gas and 10" H
2
0
pressure on LP gas.
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 9.
To adjust:
1. Remove the pilot adjustment cover screw.
2. Turn the inner adjustment screw clockwise
to de-
crease or counterclockwise
to increase pilot flame.
Pilot adjustment is shipped at full flow rate. Turn the inner
adjustment screw clockwise
if the inlet pressure is
too high.
3. Replace the cover screw after the adjustment to prevent gas
leakage.
ON
OFF
IGNITOR
C
ONTROL
INLET PRESSURE TAP
OUTLET PRESSURE TAP
PILOT ADJUSTMENT-
UNDER CAP SCREW
PILOT OUTLET
PRESSURE REGULATOR
ADJUSTMENT-UNDER CAP
SCREW
GAS FLOW
IGNITOR
C
ONTROL
TO 24 V. THERMOSTAT
TO 24 V. COMMON ON TRANSFORMER
TO 24 V."HOT" ON TRANSFORMER
WIRING
I P-MODEL GAS VALVE AND WIRING
IGNITOR-PILOT ASSY.
FAN
SWITCH
MOTOR
HONEYWELL IP
SMART VALVE
120 VAC
LIMIT
CONTROL
VENT SAFETY
LIMIT
THERMOSTAT
40 VA TRANSFORMER
24 VAC
120VAC
VALVE CONTROL
CONNECTOR
L1 "HOT"
L2 NEUTRAL
LADDER WIRING DIAGRAM-IP VALVE
Figure 13
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 automatic 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.
The Service Department at Empire Comfort Systems, Inc. may be
contacted to assist in servicing furnace.
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.
Spark Igniter Does Not Light Pilot: With air in the gas line, such
as when the furnace is first installed or was off all summer, the
pilot flame may be too lean to ignite on the first few trials. Turn
the control valve knob to pilot position and depress the red reset
button. Holding the button down continually to bleed the line;
1.
Use lighter rod to light pilot with a match.
2.
Use the piezo ignitor at 30 second intervals until it lights.
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" (4.8mm). Electrode wire
and tip must be more than 1/4" (6.3mm) 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 (counterclock-
wise 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 mil-
livolts.
Pilot Outage During Normal Operation:
1.
Check air inlet tube for a good tight fit at both ends (6"
diameter tube).
2.
Check burner door and pilot hole cover for tight seal.
3.
Check input by manifold pressure gauge or gas meter.
Main Gas Valve Does Not Open When Thermostat 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 WALL
THERMOSTAT.
2.
Thermostat wires at the wall may be shorted, so check for
a faulty thermostat.
3.
To check for line voltage to furnace, remove front panel
and short across two-terminal fan control to allow fan to
operate. (Figure 12)