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UNIT HEATER
7.8 Second Limit Thermostat
7.8.1
Remove the mounting nut securing the thermostat to the heater side.
7.8.2
Remove the heater lower rear panel to gain access to the body of the thermostat and its electrical
connections.
Disconnect the push-on electrical connections from the thermostat.
7.8.3
Remove the fan assembly from the heater rear (see 7.5 or 7.6).
Note: On models 340 and 380 B & C versions the secondary limit thermostats are mounted on the fan
mounting panel. The relevant fan will need to be removed to gain access to these thermostats.
7.8.4
Carefully pull the capillary sensing probe through its access hole in the side of the heater heat exchanger
being careful not to damage the capillary tube.
7.7.3
Unscrew two fixing screws and withdraw the unit from the cabinet feeding the cables through the
plastic conduit connection.
7.7.4
To refit, reverse the above procedure reusing the plastic conduit connection and reset as in the
commissioning instructions, Section 4.
Note: the new thermostat should have the limit setting sealed by a suitable method to prevent
unauthorised adjustment.
WARNING
When replacing a combination thermostat ensure that the link is removed.
(See Fig. 2.7). Permanent damage will be caused by leaving this link in.
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