Vulcan-hart VHX24G5 User Manual download pdf (Page 37)

VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS

F24700 (October 2001)Page 37 of 68

7. Once the correct pressure has been set, turn

the gas supply and power switch OFF. Replace

the adjustment screw cap and manifold

pressure plug tap plug on the valve.

8. Turn the gas supply on and check for proper

operation.

IGNITION CONTROL MODULE

CHECKS

1. Turn the power switch ON and allow the boiler

to fill.

2. Aux. water level control satisfied and high limit

closed.

3. Press the reset switch.

A. Combustion blower comes on and

generates pressure to close the air

pressure switch contacts.

B. Ignition control module is energized and

trial for ignition starts. Check for 24VAC

between terminals five and six.

C. Ignition module closes the internal pilot

valve contacts. Check for 24 volts

between terminals two and three.

1) High voltage is sent from terminal

nine to the spark electrode and

sparking begins.

2) At the same time, pilot timing circuit

(control board) and pilot valve are

both energized allowing gas flow to

the pilot.

NOTE:

The pilot valve will be energized

by the relay board timer circuit for

approximately 15 seconds to light the

main burner.

D. Pilot ignition is established (pilot lit), and

main gas valve is energized. Check for 24

volts between terminals one and two.

1) Sparking stops.

2) Ignition module monitors main burner

flame.

3) After 15 seconds relay board timer

times out.

a. Pilot valve de-energized.

E. As long as the ignition control module is

sensing a burner flame through the ignition

cable on terminal nine, the internal main

voltage (MV) and pilot (PV) contacts

(N.O.) remain closed.

NOTE:

If pilot flame is not sensed within 15

seconds, you can re-start the ignition

sequence.

F. "Rapidly", turn the power switch OFF then

ON. A rapid switching is needed to keep

the boiler from starting automatic

blowdown. Then press the reset button.

NOTE:

If the power is not re-set, the ignition

module continues sparking for a total of 90

seconds, then locks out. The module remains

locked out until the power switch is turned to

OFF then back ON and the reset switch is

pressed to re-start the ignition trial cycle.

Terminals:

1. Main Valve

- 24VAC will be present on terminal

#1 with the flame sensing electrode sensing an

adequate burner fame. This output voltage will

remain present as long as the burner flame

remains adequate.

2. MV/PV (common).

3. Pilot Valve

- 24VAC will be present on terminal

#3 at the instant an input voltage is supplied to

the module. This output voltage will remain

present on terminal #3 providing an adequate

pilot flame is established within 90 seconds. In

the event that an adequate pilot flame is not

established within 90 seconds this output

voltage will drop out.

4. Ground (burner).

5. 24VAC Neutral (ground).

6. 24VAC Input.

7. High Voltage to spark electrode. Provides high

output voltage (13kv peak) to the spark

electrode to light the gas pilot. Once pilot is lit,

provides a path for flame current sensing by

the Ignition Module via the spark electrode high

voltage cable on terminal #9.

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