Roberts Gorden UHD[X][S][R] 400 Manuel D’Utilisation

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UHD S
TANDARD
 D
UCT
 F
URNACE
 I
NSTALLATION
 O
PERATION
 
AND
 S
ERVICE
 M
ANUAL
36 
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.
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.
MODEL
UHD[X][S][R]
150 - 175
UHD[X][S][R]
200 - 225
UHD[X][S][R]
250
UHD[X][S][R]
300 - 350
UHD[X][S][R]
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