Astralpool HX70 Operations Instructions download pdf (Page 13)

Inst174 HX Series Pool & Spa Heater V02.15

1. Perform a final check with the heater operating.- See the section below titled “Starting the heater”.

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.

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.

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.

TESTING BURNER PRESSURE

1. Set thermostat to “OFF”

2. Set up manometer

3. Remove screw from ⅛” brass test point located on outlet side of gas valve

4. Connect manometer tube to test point

5. Set thermostat to “ON” and wait for burner to ignite

6. Once burner has ignited, the manometer must indicate the nominal burner pressure listed below

7. To adjust gas valve regulator, remove regulator adjustment cap and, using a screwdriver, turn plastic bush

clockwise to increase, anti-clockwise to decrease burner pressure

8. When burner pressure is correctly set, set thermostat to “OFF”

9. Refit test point screw and fibre washer

10. Refit regulator adjustment cap.

Maximum inlet gas pressure is:

Natural Gas 3.5 kPa

Propane Gas 3.5 kPa

Nominal burner pressure is:

HX 70

HX 120

Natural Gas

1.0 kPa

0.92 kPa

Propane Gas

2.62 kPa

Pressure Switch Adjustment

Slide toggle

up to allow

adjustment

Turn wheel in

direction of

arrow to

decrease

pressure

required to

operate heater

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Astralpool HX70 Operations Instructions Page 13

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