Addison UHD150, Installation, Operation & Service Manual

Page: 57 / 68

SECTION 15: R
EPLACEMENT
P
ARTS
49 of 55
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 28, Section 11 .
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 Limit Switches
15.9.1 Removal and Replacement
1. Remove the electrical connections to the switch.
2. Unscrew the two screws securing the switch.
3. Fit a new switch with two screws.
4. Reconnect the electrical connections and test operation.
MODEL
UHD
[T][M][X][S][R]
150 - 175
UHD
[T][M][X][S][R]
200 - 225
UHD
[T][M][X][S][R]
250
UHD
[T][M][X][S][R]
300
UHD
[T][M][X][S][R]
350
UHD
[T][M][X][S][R]
400
Pressure Switch
Kit P/N
90439803 90439808 90439812 90439811 90439805 90439811
Color Code grey orange orange grey blue grey
Set Point (in wc) 0.41 0.79 0.18 0.72 0.55 0.72
Pressure Switch
Snap Ring P/N
90439850 90439850 90439850 90439850 90439850 90439850
Carbon Monoxide Hazard
Use correct pressure switch specified for each
model.
Use of incorrect pressure switch or disabling
pressure switch circuit could cause unsafe
condition.
Failure to follow these instructions can result in
death or serious injury.
WARNING