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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.