Roberts Gorden Tubular Unit Heaters 300 User Manual
Page 38
COMBAT
®
UHA U
NIT
H
EATER
I
NSTALLATION
O
PERATION
AND
S
ERVICE
M
ANUAL
32
14.2 Burner Compartment
14.2.1 Burner Injectors
Remove flexible
air duct from spigot
Remove
access plate
Remove screws and
pull off burner cover
Viewing port
for flame probe
Viewing port
for ignition electrode
Flame probe
Burner
compartment
cover
Rubber Seal
Ignition electrode
The burner compartment is
a sealed compartment.
Following any work,
re-seal the compartment
with the gas pipe rubber
seal fully in place and all
screws fitted and tight.
NOTE: Flexible duct only applies
for models UHAS.
MODEL
UHA[S]
150
UHA[S]
175
UHA[S]
200
UHA[S]
225
UHA[S]
250
UHA[S]
300
UHA[S]
350
UHA[S]
400
Orifice Quantity
7
8
9
10
11
12
14
14
Natural Gas (G20)
Orifice Marking
43
43
2.25 mm
2.25 mm
2.25 mm
40
40
40
P/N
91930043
91930043
91930225
91930225
91930225
91930040
91930040
91930040
Propane (G31)
Orifice Marking
1.35 mm
1.35 mm
54
54
54
1.45 mm
53
53
P/N
91930135
91930135
91930054
91930054
91930054
91930145
91930053
91930053
Ensure gas tight fitting of injectors.
Ensure correct alignment with burners.
Ensure all pipe joints are gas tight.