Astralpool HX70 Operations Instructions download pdf (Page 12)

Inst174 HX Series Pool & Spa Heater V02.15

ELECTRICAL CONNECTION

The heater is supplied with a standard 10 amp 3 pin plug for connection to a 240V 10 amp GPO. The heater

incorporates a 240/24 VAC transformer which supplies power to the control circuit. All pool or spa equipment

connected to mains power should be protected by an RCD circuit breaker. It is recommended, where possible that

the heater is connected to the same time clock or power supply as the circulating pump.

GAS CONNECTION

The gas connection is on the rear of the heater. A 15 mm F.I. connection is provided for gas line connection. An

approved manual shut off valve must be installed in the gas fitting line before the heater and should be sized the

same as the gas fitting line to prevent excessive pressure drop in the gas pipe.

The gas fitting line should be installed by an authorised person and comply with local regulations and Standards

Australia code AS5601. The gas line from the meter will usually be of a larger size than the gas inlet connection.

Therefore a reduction to the heater connection fitting will be necessary. The reduction should be as close to the

heater as possible.

Before using the heater, test all connections for leaks using soapy water.

The heater gas valve has a built in pressure regulator and ⅛” pressure test point. On starting the heater, a

manometer must be used and burner pressure checked against the heater data plate. The gas valve regulator

may need to be adjusted to correct manifold pressure. Incorrect burner pressure may void warranty.

PRESSURE SWITCH ADJUSTMENT

The AstralPool Heater incorporates a water pressure switch which allows the burner to operate only when the

circulating pump is operating.

It is imperative that the following be undertaken by the person who is commissioning (first starting) your pool or

spa heater. On initial start up of the heater it may be necessary to adjust the water pressure activation switch.

This switch is located behind the top rear panel and is screwed into the water manifold. The pressure switch is

designed to allow operation of the heater only when the circulating pump is turned on and there is sufficient water

flow through the heater. It must shut the heater down immediately the pump is switched off.

To check the operation of the switch:

1. Connect the heater to mains power supply. The thermostat should not yet display “θ”.

2. Turn on pump. The thermostat should now display “θ”.

3. Turn pump off. The thermostat should no longer display “θ”.

4. If display does not respond in this way, adjust the pressure switch as detailed below. If display responds

correctly, perform a final check with the heater operating.- See the section below titled “Starting the heater”

To adjust pressure switch:

1. Connect the heater to mains power supply

2. Turn pump off

3. Slide toggle on side of pressure switch up to allow knurled wheel to be turned

4. Turn knurled wheel anti-clockwise (as viewed from above) until “θ” is displayed

5. Turn knurled wheel clockwise until “θ” disappears

6. Continue to wind clockwise for a further half turn (180 degrees)

7. When the switch is correctly set, slide the toggle down 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.

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Astralpool HX70 Operations Instructions Page 12