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SECTION 14: REPLACEMENT PARTS
39
14.6 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 23, Section 10.
14.7 Ignition Control
The control mounts to the heat exchanger 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.
14.8 Limit Switches
14.8.1 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[X][S][R] 75 UHD[X][S][R] 100 UHD[X][S][R] 125
Pressure Switch Kit P/N
90439810 90439810 90439803
Color Code
black black gray
Set Point in wc
.35 .35 .41
Pressure Switch Snap Ring P/N
90439850 90439850 90439850