Gas Manifold Pressure Adjustment - Vulcan-Hart GR Series Service Manual

GR Series Gas Fryers with NCC Controls (formerly Tridelta / Built after 3/05) - SERVICE PROCEDURES AND
Fig. 46
D. Check the ignitor cable connection for
tightness and damaged insulation. If the
ignitor cable appears to be damaged, install
a replacement ignitor cable.
6. With gas pilot installed and the ignitor cable
connected, reconnect power and turn on the gas
supply.
7. Turn on power switch, and observe spark from
ignitor.
A. If spark from ignitor is present and ignites
the gas for the pilot, and the burners light,
the system is working properly.
B. If gas pilot lights but does not maintain an
adequate flame during the trial for ignition
(90 seconds), 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 off the power switch to reset the
module. Wait 5 minutes between
ignition tries for unburned gas to vent.
Turn on the power switch. Sparking
should resume to ignite pilot. The
module may need to be reset several
times before ignition takes place.
F35660 Rev. A (0717)
ADJUSTMENTS
D. If ignitor is still not sparking, turn off the
power switch, disconnect power, and turn
off the gas supply.
8. Install a replacement ignition control module, and
check for proper operation.
GAS MANIFOLD PRESSURE
1. Open the door(s), and turn off the gas
combination valve.
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.
3. Turn on the gas supply, the gas combination
valve, and the power switch.
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 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, continue with
procedure.
5. Remove the adjustment screw cap to access the
pressure adjustment screw.
Page 26 of 56
ADJUSTMENT
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
Shut off the gas
before servicing the unit and follow
lockout / tagout procedures.