MX Pool and Spa Heater Page 13
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 left side of the heater. A 20 mm (25mm for MX 500) 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 A.G.A. 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 a 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 adjustment to correct manifold pressure. Incorrect burner pressure
may void warranty.
PRESSURE SWITCH ADJUSTMENT
The Hurlcon MX Series Pool 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 at the upper right hand side of the area behind the access door. 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”
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