UHD S
TANDARD
D
UCT
F
URNACE
I
NSTALLATION
O
PERATION
AND
S
ERVICE
M
ANUAL
32
SECTION 14: REPLACEMENT PARTS
See warnings and important information
on Page
25, Section 12
before removing or replacing parts.
Burner Components
All serviceable burner parts are accessed by the
door on the side of the heater. Remove the
sheetmetal screws.
14.1 Gas Valve
Remove the gas supply pipe at the heater inlet.
Follow steps in
Section 14.2
and
See Page 33,
Section 14.2.1
to remove gas valve/manifold.
Replace in reverse order. Verify that the gas flow
direction of the valve is correct. Use a minimum
amount of gas seal on the thread joint. Check that
all the joints are leak free. Reset gas valve.
See
Page 23, Section 10.2.2
.
IT IS IMPORTANT THAT ONLY THE CORRECT
GAS VALVE IS USED WHEN REPLACING THESE
CONTROLS.
WARNING
Explosion Hazard
Installation, service and annual inspection
must be done by a contractor
q
ualified in
the installation and service of
g
as-fired
heatin
g
e
q
uipment or your
g
as supplier.
Turn off
g
as and electrical supplies before
performin
g
service or maintenance.
Failure to follow these instructions can
result in death, injury or property dama
g
e.
½PSI
I
N
C
O
N
OFF
Flexi
b
le
Air D
u
ct
NOTE:
Separated combustion model shown.
Description
Part Number
Gas Valve, NG (Models UHD[X][S][R] 150 - 225)
90032505
Gas Valve, LP (Models UHD[X][S][R] 150 - 225)
90032506
Gas Valve, NG (Models UHD[X][S][R] 250 - 400)
90032520
Gas Valve, LP (ModelsUHD[X][S][R] 250 - 400)
90032521
