Gas Manifold Pressure Adjustment - Vulcan-Hart 1GR45A Service Manual

GRA SERIES GAS FRYERS - SERVICE PROCEDURES AND ADJUSTMENTS
GAS MANIFOLD PRESSURE
ADJUSTMENT
1. Open the door(s) and remove drain pipe.
2. To measure the manifold pressure, remove plug
and attach manometer to pressure tap in
manifold.
NOTE: Gas manifold pressure can also be
measured by removing the 1/8 inch NPT plug
(pressure tap) on the outlet side of the gas
combination valve and attaching a manometer.
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
F25377 (March 2010)
adequate sizing.
B. If adjustment is necessary, continue with
procedure.
5. Remove burners as necessary.
6. Remove the adjustment screw cap to access
the pressure adjustment screw on gas
combination valve.
A. To increase pressure, turn the screw
clockwise. To decrease pressure, turn the
screw counterclockwise.
NOTE: Accurate gas pressure adjustments can only
be made with the gas on and the burner lit.
7. Set the pressure as outlined below:
GAS
TYPE
MANIFOLD
Natural
Propane
NOTE: If the incoming line pressure is less than the
minimum stated, then the manifold pressure can not
be set correctly.
8. Once the correct pressure has been set, turn
the power switch off, replace the adjustment
screw cap and manifold plug.
9. Install drain pipe and burners.
10. Check for proper operation.
Page 18 of 36
PRESSURE READINGS
(INCHES W.C.)
LINE
RECOMMENDED
4 7
10 11
MIN MAX
5
14
11