WARNING: If the pressure switch cannot be adjusted correctly, DO NOT OPERATE THE HEATER, contact
Astral or an Authorised Service Agent for advice.
1. Perform a final check with the heater operating.- See the section below titled “Starting the heater”.
It is imperative that the heater is installed so that it does not operate when the circulating pump stops.
Recommended methods to achieve this are:
a. Correct adjustment of internal pressure switch. Ensure heater does not turn on two or three minutes after
circulating pump is turned off.
b. Installation of an external flow switch may be preferred under certain installations where internal pressure
switch does not turn heater off when circulator stops.
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