Sirius FS
55
GB/IE
7.3.6 Flow and Return Temperature Sensors
-
See section 7.2 (items 6 & 7) for access
- Valve off and / or drain down primary system to minimise spillage
- Remove left hand side panel to access flow temperature sensor / Remove
right hand side panel to access return temperature sensor.
- Unplug electrical connector from sensor
- Unscrew sensor from heat exchanger
- Replacement is the reverse
Water pressure
transmitter
Flow high temp limit
thermostat
Temperature sensor
Fibre washer
7.3.7 Water Pressure Transmitter
-
See section 7.2 (item 6) for access
- Valve off and / or drain down primary system to minimise spillage
- Remove front left hand side panel
- Unplug the electrical connector from the transmitter (taking note of the
connection position)
- Unscrew pressure switch from heat exchanger
- Replacement is the reverse
When replacing any item screwed directly into the heat exchanger, there will
always be a quantity of water which will escape from the opening. In order to
minimise water loss place a small container directly below the item being changed
and perform the exchange as quickly as possible
.
7.3.8 Flow High Temperature Limit Thermostat
-
See section 7.2 (item 6) for access
- Unplug electrical connectors and remove sensor from under the clamp
- Replacement is the reverse
7.3.9 Rear High Temperature Thermal Fuse
-
See section 7.2 (items 8 & 9) for access
- Unplug electrical connectors and remove sensor from under the clamp
- Replacement is the reverse
Inspect the condition of the insulation at the rear of the affected heat exchanger
chamber before attempting to operate the boiler again. Failure to do so could result in
permanent damage. See section 7.3.18 for insulation replacement guidance.
