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VL BOILER BASE SERIES CONVECTION STEAMERS - SERVICE PROCEDURES AND ADJUSTMENTS
GAS MANIFOLD PRESSURE
ADJUSTMENT
CERTAIN PROCEDURES IN THIS
SECTION REQUIRES ELECTRICAL
TEST OR MEASUREMENTS WHILE
POWER IS APPLIED TO THE
MACHINE. EXERCISE EXTREME
CAUTION AT ALL TIMES. IF TEST
POINTS ARE NOT EASILY
ACCESSIBLE, DISCONNECT
POWER, ATTACH TEST
EQUIPMENT AND REAPPLY
POWER TO TEST.
DISCONNECT THE ELECTRICAL
POWER TO THE MACHINE AT THE
MAIN CIRCUIT BOX. PLACE A TAG
ON THE CIRCUIT BOX INDICATING
THE CIRCUIT IS BEING SERVICED.
SHUT OFF THE GAS SUPPLY BEFORE
SERVICING THE UNIT.
1.
Open the front cabinet doors and turn the gas
combination control 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.
3.
Turn the gas combination control valve and the
main power switch to ON.
4.
After the burner lights, compare the manometer
pressure reading 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 the
pressure drops ½ inch water column or
more, then the incoming pressure should be
checked. Then the gas supply needs to be
checked by the gas line installer or the local
gas company for adequate sizing.
B.
If no other gas appliances are connected to
the gas line or the pressure does not drop
as described above but the manifold
pressure still requires adjustment, proceed
to step 5.
5.
Remove the adjustment screw cap to access the
pressure adjustment screw.
6.
After the burner lights, set the pressure as
outlined below.
A.
To increase pressure, turn the screw
clockwise.
B.
To decrease pressure, turn the screw
counterclockwise.
NOTE: Accurate gas pressure adjustments can only
be made with the gas ON and the burner lit.
PRESSURE READINGS (INCHES W.C.)
GAS
MANIFOLD
TYPE
Nat.
4.0
Prop.
10.0
NOTE: Nat. = Natural Gas, Prop. = Propane
NOTE: If the incoming line pressure is less than the
minimum stated, then the manifold pressure cannot
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.
Page 37 of 93
Fig. 16
LINE
RECOMMENDED MIN MAX
7.0
5.0
11.0
11.0
F24650 Rev. A (1017)
14
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