Vulcan VG30 User Manual download pdf (Page 20)

GAS BRAISING PANS - SERVICE PROCEDURES AND ADJUSTMENTS

F25121 (February 2003) Page 20 of 32

2. Ignition control module is energized and trial

for ignition starts (90 seconds).

A. Verify 24VAC between terminals 5 & 6.

1) If voltage is not present, see

schematic diagram.

3. Pilot valve (PV) contacts close to energize the

pilot valve coil, allowing gas flow to the pilot

burner.

A. Verify 24VAC between terminals 2 & 3.

1) If voltage is not present, replace

ignition control module and check for

proper operation.

4. At the same time, spark voltage is sent from

terminal 9 to the ignitor/flame sense electrode

and sparking begins.

The pilot burner lights, pilot flame is sensed,

spark voltage from terminal 9 is removed and

sparking stops. Main valve (MV) contacts close

to energize main valve coil, allowing gas flow

to the runner tube and main burners.

A. Verify 24VAC between terminals 1 and 2.

1) If voltage is not present, replace

ignition control module and check for

proper operation.

5. With pilot burner lit, the runner tube lights and

main burners light.

6. As long as the temperature controller is calling

for heat and the ignition control module is

sensing a sufficient flame sense current, the

pilot valve (PV) and main valve (MV) contacts

will remain closed.

NOTE: If pilot burner does not immediately light, the

ignition control module continues sparking for 90

seconds, then locks out power to the gas

combination valve (pilot valve and main valve

remain closed). The module remains locked out

until the on/off switch is cycled to reset the system

re-start the ignition trial cycle.

GAS MANIFOLD PRESSURE

ADJUSTMENT

WARNING: SHUT OFF THE GAS SUPPLY

BEFORE SERVICING THE UNIT.

GAS PRESSURE (INCHES W.C.)

Gas

Type

Manifold

Line

Recommended Min Max

Natural 3.7 7.0 5.0

14.0

Propane 10.0 11.0 11.0

NOTE: If the incoming line pressure is less

than

the minimum stated, then the manifold pressure

cannot be set correctly.

1. Lower the pan to the full down position.

2. Remove front panel as outlined under COVERS

AND PANELS in REMOVAL AND

REPLACEMENT OF PARTS.

3. Access the gas combination valve as outlined in

REMOVAL AND REPLACEMENT OF PARTS.

4. Remove 1/8" NPT pipe plug on the outlet side

of the gas valve (manifold pressure tap).

5. Install a hose barb adaptor at the port and

attach a manometer.

6. Turn gas supply, gas combination valve and

on/off switch to on.

A. Set the temperature dial to call for heat.

B. Verify main burners light.

7. Observe manometer pressure reading and

compare to the gas pressure table.

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" W.C. 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.

8. Remove adjustment screw cap to access the

pressure adjustment screw.

A. To increase pressure, turn the screw

clockwise

. To decrease pressure, turn the

screw counterclockwise

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Vulcan VG30 User Manual Page 20

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