MX Pool and Spa Heater Page 14
To adjust pressure switch:
a) Connect the heater to mains power supply
b) Turn pump off.
c) Slide toggle on side of pressure switch down to allow knurled wheel to be turned.
d) Turn knurled wheel anti-clockwise (as viewed from above) until “θ” is displayed.
e) Turn knurled wheel clockwise until “θ” disappears.
f) Continue to wind clockwise for a further half turn (180 degrees).
g) When the switch is correctly set, slide the toggle up to lock the knurled wheel in position.
WARNING: If the pressure switch cannot be adjusted correctly, DO NOT OPERATE THE
HEATER, contact AstralPool or an Authorised Service Agent for advice.
h) 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) Interlock power supply of circulating pump and heater so that if timer or power turns
circulating pump off, heater is also turned off.
c) Installation of an external flow switch may be preferred under certain installations
where internal pressure switch does not turn heater off when circulator stops.
STARTING THE HEATER
1. Purge gas line of any air and wait five minutes for gas to clear.
2. Turn power to unit on. Thermostat should now operate and indicate water temperature.
3. Turn circulating pump on. Thermostat should display “θ” to indicate water flow.
4. Set thermostat to “ON” and press the “^” button repeatedly until set temperature is greater
than water temperature. Thermostat should now display “ ”.
5. After a few seconds, the burner should ignite. Ignition will be confirmed by the symbol “
”
6. While leaving the heater on, turn the pump off and on at 15 second intervals, six times.
Make sure the heater turns off and on each time. If it does not, adjust the pressure switch as
detailed above.
Pressure Switch Adjustment
Slide toggle
down to allow
adjustment
Turn wheel in
direction of arrow
to decrease
pressure required
to operate heater
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