SECTION 15: REPLACEMENT PARTS49 of 5515.7 Pressure SwitchPull off 3 way connector. Spring open plastic clips of mounting cradle. Replace with correct type ofpressure 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 ControlThe control mounts to the electrical plate. Pull out ignition cable and wiring from board, noting theirpositions. Release the four mounting standoffs. Refit in reverse. Ensure correct location of ignition cableand all other wiring.15.9 Limit Switches15.9.1 Removal and Replacement1. 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.MODELUHD[T][M][X][S][R]150 - 175UHD[T][M][X][S][R]200 - 225UHD[T][M][X][S][R]250UHD[T][M][X][S][R]300UHD[T][M][X][S][R]350UHD[T][M][X][S][R]400Pressure SwitchKit P/N 90439803 90439808 90439812 90439811 90439805 90439811Color Code grey orange orange grey blue greySet Point (in wc) 0.41 0.79 0.18 0.72 0.55 0.72Pressure SwitchSnap Ring P/N 90439850 90439850 90439850 90439850 90439850 90439850Carbon Monoxide HazardUse correct pressure switch specified for eachmodel.Use of incorrect pressure switch or disablingpressure switch circuit could cause unsafecondition.Failure to follow these instructions can result indeath or serious injury.WARNING
