Service manual

SERVICING
46
PSI IN
OFF
ON
2
OUTLET PRESSURE TAP
1/8 N.P.T., PLUGGED
(STEEL)
PRESSURE REGULATOR
ADJUSTMENT (UNDER
CAP SCREW)
MATES WITH
HONEYWELL
Q3450* PILOT
HARNESS
MATES WITH
SOCKET HOUSING
CONTROL MODULE
IGNITOR
CONT ROL
A-A
VIEW A-A
MATES WITH
HONEYWELL
Q3450* PILOT
HARNESS
HONEYWELL MODEL SV9500
IGNITER
CONTROL
HONEYWELL
MATES WITH
SOCKET HOUSING
MOLEX 39-01-0240
TO CONTROL
OFF
ON
IN
1/2PSI
MATES WITH
HONEYWELL
Q3450* PILOT
HARNESS
HONEYWELL MODEL SV9501
10. Ignitor warn up is 5 Seconds. Amp draw to ignitor is 1
to 1.5 amps at 24 VAC. Use an Amprobe to verify cur-
rent.
11. Using a microamp meter verify flame sense. Microamp
readings should be 0.3 microamps or greater.
12. Smart Valve will not allow main burner operation until
pilot is proven. NOTE: pilot positioning will affect pilot
operation and flame sensing characteristics. See S-
314 for proper pilot positioning.
13. If pilot looses flame sense, valve will shut off main burn-
ers and attempt relight. The "Smart Valve" system will
not lock out from no flame sense, it will continue to at-
tempt relight.
Direct Spark Ignition (DSI) Systems
A combination redundant operator type gas valve which
provides all manual and automatic control functions required
for gas fired heating equipment is used.
The valve provides control of main burner gas flow, pres-
sure regulation, and 100 percent safety shut-off.
WARNING
Disconnect Electrical Power Supply:
1. Remove wire connections from gas valve terminals.
2. Using an ohmmeter, test across the gas valve coil ter-
minals, both the redundant and the main valve.
M
P
1
3
2
C
O
F
F
ON
Outlet (Manifold)
Pressure Tap
(Side of Valve)
Pressure Regulator
Adjustment
(Under Cap Screw)
OUTLET
INLET
Inlet Pressure Tap
(Side of Valve)
Gas Valve
On/Off
Selector
Switch
WHITE ROGERS MODEL 36E GAS VALVE
3. Should read approximately 130 Ohms for the Robert-
shaw main valve operator coils. The redundant coil will
vary somewhat as well.
4. Reverse leads. Some redundant coils have (dividers)
diodes.
If not as above, replace the entire valve.
S-305 CHECKING MAIN BURNERS
The main burners are used to provide complete combus-
tion of various fuels in a limited space, and transfer this
heat of the burning process to the heat exchanger.