Roberts Gorden UHD[X][S][R] 400 service manual Pressure Switch, Ignition Control, Limit Switches

UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL

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 21, Section 10.

	UHD[X][S][R]	UHD[X][S][R]	UHD[X][S][R]	UHD[X][S][R]	UHD[X][S][R]
MODEL	150 - 175	200 - 225	250	300 - 350	400
Pressure Switch
Kit P/N	90439802	90439808	90439803	90439807	90439808
Color Code	yellow	orange	gray	brown	orange
Set Point (in wc)	.32	.79	.41	.68	.79
Pressure Switch
Snap Ring P/N	90439850	90439850	90439850	90439850	90439850

14.7 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.

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.

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