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, i f necessary, allow to
cool.
2. Disconnect the elec t rical power to the machine
at the main circuit box . Place a tag on the
circuit box indicati ng the circuit is being
serviced.
3. Remov e t he pressure gauge tubing and power
cable from the rear of t he c ont rol panel then
remove the panel.
4. Disconnect the elec t rical 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 v alve (purple & grey).
E. Pilot burner valv e (red & grey).
F. Spark ignition cabl e.
5. Remov e bol ts securing the boiler control box
(front) to the base frame.
A. Lift up on left side of box and slide out.
6. Disconnect pil ot gas tubing from the air
pressure switch tee.
7. Separate the union abov e the main gas valv e
and remove the gas valv e piping assembly.
NOTE: Removal of the gas valve pipi ng assembl y
assumes the use of a gas line quick connect or
union at the gas supply inlet to the steamer.
8. Remov e t he four nuts from combustion bl ower
mounting flange and remov e blower from
burner tube assembly.
9. Remov e t he four bolts connecting the
horizontal flue (lef t of boiler) to the f l ue
"transition" piece.
A. Separate the horizontal flue f rom flue
"transition" piece, leav ing the horizontal
flue in place.
10. Remove the four nut s 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 fl ue "transition" piece from t he
heat exchanger.