Vulcan-hart VHX24G5 User Manual download pdf (Page 33)

VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS

F24700 (October 2001)Page 33 of 68

AIR PRESSURE SWITCH

ADJUSTMENT

The air pressure switch senses the pressure level

produced by the blower for combustion. When the

pressure is sufficient, the switch closes and supplies

power to the ignition control module. The gas

ignition sequence starts to light the gas pilot and

then main burner. If the gas pilot is not lighting

(valve not energized), the ignition control module

may not be receiving power, assuming the minimum

water level is satisfied. Check the air pressure

switch operation then adjust if necessary as outlined

in the procedure below.

1. Turn the power switch OFF.

2. Remove the left side panel from the cabinet

base.

A. Inspect the air intake to the blower for

debris build up and clogging.

1) If debris is found, clean it away from

the air intake.

B. Turn the power switch ON and verify main

burner ignition.

1) If burner ignites then no adjustment to

the pressure switch setting is

necessary.

2) If burner does not

ignite, proceed to

step 3.

3. Open the cabinet base door and turn the

ON/OFF knob for the main gas valve to OFF.

4. Adjust the air pressure switch setting as

follows:

A. Turn the adjustment screw fully clockwise

to the highest setting.

B. Slowly turn the adjustment screw

counterclockwise

until the pilot gas valve

energizes then add ½ turn to the

adjustment.

NOTE

: The screw head should not

extend out

past the screw housing.

1) If Pilot gas valve energizes, proceed

to step 5.

2) If Pilot gas valve does not

energize,

check the following:

a. Remove the lead wires from the

switch and verify with a meter

that the switch contacts are

closing with the blower ON. If

necessary, continue to turn the

adjustment screw several turns

counterclockwise

to CLOSE the

switch contacts.

b. If the switch contacts are not

closing, turn the power switch

OFF, remove the pressure

switch from the TEE and check

the air orifice for debris build up

and clogging. If debris is found,

clean it away from the orifice.

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Vulcan-hart VHX24G5 User Manual Page 33

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