TEMPERATURE DIFFERENTIAL FLOW AND RETURN

TEMPERATURE DIFFERENTIAL FLOW AND RETURN - DHW

Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4

Turn Hot Water Tap On

DHW temperature set to MAX
Attach temperature clamp to flow pipe of the primary heat exchanger

WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure

Mains Power On

Observation:

Allow self-check to complete and appliance
to operate for hot water for 3 minutes.
Monitor the temperature differential across flow and return pipes.
Expected temperature differential approximately 30°C or less.
Note:
Ensure a good connection is made with the flow & return pipes
or misdiagnosis will occur

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Flow pipe

Return pipe

For flow pipe, attach temperature clamp to a flat side of brass nut at diverter valve as illustrated

For return pipe, use a temperature probe as getting a good connection is difficult with clamp