Vulcan-hart VHX24G5 User Manual download pdf (Page 19)

VHX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS

F24700 (October 2001)Page 19 of 68

HEAT EXCHANGER

WARNING:

SHUT OFF THE GAS BEFORE

SERVICING THE UNIT.

WARNING:

ALL GAS JOINTS DISTURBED

DURING SERVICING MUST BE CHECKED FOR

LEAKS. CHECK WITH A SOAP AND WATER

SOLUTION (BUBBLES). DO NOT USE AN OPEN

FLAME.

1. Blowdown the boiler and, if necessary, allow to

cool.

2. 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.

3. Remove the pressure gauge tubing and power

cable from the rear of the control panel then

remove the panel.

4. Disconnect the electrical lead wires exiting the

boiler control box from:

A. Auxiliary LLCO probe (Orange).

B. Burner ground (green).

C. Air pressure switch (yellow & yellow/white

stripe).

D. Main gas valve (purple & grey).

E. Pilot burner valve (red & grey).

F. Spark ignition cable.

5. Remove bolts securing the boiler control box

(front) to the base frame.

A. Lift up on left side of box and slide out.

6. Disconnect pilot gas tubing from the air

pressure switch tee.

7. Separate the union above the main gas valve

and remove the gas valve piping assembly.

NOTE

: Removal of the gas valve piping assembly

assumes the use of a gas line quick connect or

union at the gas supply inlet to the steamer.

8. Remove the four nuts from combustion blower

mounting flange and remove blower from

burner tube assembly.

9. Remove the four bolts connecting the

horizontal flue (left of boiler) to the flue

"transition" piece.

A. Separate the horizontal flue from flue

"transition" piece, leaving the horizontal

flue in place.

10. Remove the four nuts from the complete

burner tube assembly then slowly

pull the

assembly straight out from the heat exchanger.

CAUTION: Use care while removing as to not

damage the ceramic insulation surrounding the

burner.

11. Remove the flue "transition" piece from the

heat exchanger.

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Vulcan-hart VHX24G5 User Manual Page 19

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