UHA S
TANDARD
U
NIT
H
EATER
I
NSTALLATION
O
PERATION
AND
S
ERVICE
M
ANUAL
40 of 51
SECTION 15: REPLACEMENT PARTS
See
w
arnings and important information
on Page
32, Section 13
before removing or replacing parts.
Burner Components
All serviceable b
u
rner parts are accessed by the
door on the side of the heater. Control door opens
via tooled access.
15.1 Gas Valve
Remove the gas s
u
pply pipe at the heater inlet.
Follo
w
steps on
Page 41, Section 15.2
and
See
Page 41, Section 15.2.1
to remove gas valve/
manifold.
Replace in reverse order. Verify that the gas flo
w
direction of the valve is correct. Use a minim
u
m
amo
u
nt of gas seal on the thread joint. Check that
all the joints are leak free. Reset gas valve.
See
Page 29, Section 11.2.2
.
IT IS IMPORTANT THAT ONLY THE CORRECT
GAS VALVE IS USED WHEN REPLACING THESE
CONTROLS.
Carbon Monoxide Hazard
WARNING
Use only genuine ROBERTS GORDON
®
replacement parts per this installation, operation and
service manual.
Failure to follow these instructions can result in death, electric shock, injury or property damage.
Explosion Hazard
DANGER
Electrical Shock Hazard
Fire Hazard
½PSI
I
N
C
O
N
OFF
Flexi
b
le
Air Duct
Description
Part Number
Gas Valve, NG (Models UHA[X][S] 150 - 250)
90032505
Gas Valve, LP (Models UHA[X][S] 150 - 250)
90032506
Gas Valve, NG (Models UHA[X][S] 300 - 400)
90032520
Gas Valve, LP (Models UHA[X][S] 300 - 400)
90032521
NOTE:
Seperated comb
u
stion
model sho
w
n.
