Pressure Switch; Ignition Control; Axial Fan/Guard/Motor Assembly - Roberts Gorden Combat UHA-Series Installation, Operation & Service Manual

15.7 Pressure Switch

Pull off 3 way connector. Spring open plastic clips of mounting cradle. Replace with correct type of
pressure switch for model. The pressure switches are color coded for each pressure setting.
Carry out a start-up after working on or changing a pressure switch. See Page 27 , Section 11.
UHA[X][S]
MODEL 150 - 175
Pressure Switch
Kit P/N 90439802
Color Code
Set Point in. w.c.
Pressure Switch Snap
Ring P/N 90439850

15.8 Ignition Control

The control mounts to the electrical plate. Pull out ignition cable and wiring from board, noting their
positions. Release the four mounting standoffs. Refit in reverse. Ensure correct location of ignition cable
and all other wiring.

15.9 Axial Fan/Guard/Motor Assembly

The axial fan unit for the heater is supplied completely assembled and balanced
MODEL
Axial Fan Guard
Axial Fan Motor
Axial Fan Blade
UHA[X][S]
200 - 225
90439808
yellow orange
.32 .79
90439850
UHA[X][S] 150 - 175
91901104
90600107
90709006
SECTION 15: R
UHA[X][S] UHA[X][S]
250 300 - 350
90439803 90439807
gray brown
.41
90439850 90439850
UHA[X][S] 200- 250
91901104
90600107
90709006
P
EPLACEMENT
UHA[X][S]
400
90439808
orange
.68 .79
90439850
UHA[X][S] 300 - 400
91901105
90600106
90709005
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