Gas Manifold Pressure Adjustment - Vulcan-Hart GRC35 Service Manual

GR SERIES GAS FRYERS - SERVICE PROCEDURES AND ADJUSTMENTS
B. If gas pilot lights but does not maintain an
adequate flame during the trial for ignition (90
sec.), check pilot orifice for clogging.
CAUTION: If orifice is clogged with debris, clean
with air or liquid only.
C. If spark from ignitor is present but does not ignite
pilot gas before the ignition control module locks
out, there may not be enough gas in the line for
ignition.
Turn the power switch off to re-set the module.
Wait 5 minutes between ignition tries for unburned
gas to vent. Turn the power switch on and
sparking should resume to ignite pilot. The module
may need re-set several times before ignition
takes place.
D. If ignitor is still not sparking, turn the power switch
off, disconnect power and turn the gas supply off.
7. Install a replacement ignition control module and
check for proper operation.
GAS MANIFOLD PRESSURE
ADJUSTMENT
WARNING: DISCONNECT THE
ELECTRICAL POWER TO THE
MACHINE AND FOLLOW LOCKOUT /
TAGOUT PROCEDURES. THERE MAY
BE MULTIPLE CIRCUITS. BE SURE ALL
CIRCUITS ARE DISCONNECTED.
WARNING: SHUT OFF THE GAS SUPPLY BEFORE
SERVICING THE UNIT.
1. Open the doors and turn the gas combination valve
off.
2. To measure the manifold pressure, remove the 1/8
inch NPT plug (pressure tap) on the outlet side of the
valve and attach a manometer.
NOTE: Gas manifold pressure can also be measured at
the pressure tap in the manifold. However, the fryer
drain pipe may need removed for access.
3. Turn the gas supply, gas combination valve and the
main power switch to on.
A. Verify burners light.
4. Observe the manometer pressure reading and
compare to the pressure chart near the end of this
procedure.
A. If other appliances are connected to the same gas
line, turn them all on and check manometer
pressure reading again. If a pressure drop of 1/2
inch water column or more is observed, then the
gas supply needs to be checked by the gas line
installer or the local gas company for adequate
sizing.
B. If adjustment is necessary, proceed to step 5.
F-25114 Rev.A (07-03)
5. Remove the adjustment screw cap to access the
pressure adjustment screw.
A. To increase pressure, turn the screw clockwise.
To decrease pressure, turn the screw
counterclockwise.
GAS COMBINATION VALVE FOR ELECTRONIC
NOTE: Accurate gas pressure adjustments can only be
made with the gas on and the burner lit.
6. Set the pressure as outlined below:
PRESSURE READINGS (INCHES W.C.)
GAS
MANIFOLD
TYPE
Natural 4
Propane 10
NOTE: If the incoming line pressure is less than the
minimum stated, then the manifold pressure can not be
set correctly.
7. Once the correct pressure has been set, turn the
power switch off, replace the adjustment screw cap
and 1/8 inch NPT plug (pressure tap) on the outlet
side of the valve.
8. Check for proper operation.
– 22 –
IGNITION SHOWN
LINE
RECOMMENDED MIN MAX
7
11
5
14
11