HeatStar XF EC, Product Manual, Page: 42 / 55

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BOILER OPERATION
Ensuring that the boiler is called to operate :
If the boiler is dedicated to the Heatstar then, depending upon how the electrician has chosen to wire the control
circuit, the boiler may only switch on automatically when the heating is called for.
With the Heatstar running, on the Heatstar control panel the
‘Air Temperature’ green neon should be lit calling for
air heating. If this is not the case then temporarily increase the control setting temperature until the neon is lit.
This should ensure that the boiler is called to operate.
The boiler water is simply re-circulated through the Heatstar, then back to the boiler.
The boiler water is pumped around this closed circuit by the boiler circulating pump, which will normally be
located either close to the boiler or actually inside the boiler.
After a short time, the copper pipe work from the boiler through the Heatstar should become very hot.
Boiler water temperature :
The boiler will invariably have a temperature control dial which governs how hot the boiler water through the
Heatstar will be. This should be set to 80°C with fuel boilers.
Such a temperature is obviously very hot and is not far short of boiling. Therefore the copper pipe entering the
Heatstar should be far too hot to hold for any length of time. If this is not the case, then the boiler is not supplying
enough heat to the Heatstar.
CONDENSING FUEL BOILERS :
If the fuel boiler is a high efficiency condensing type boiler, then it may be necessary to operate at lower boiler
water flow temperatures in order to achieve optimum efficiency, for example 70°C flow / 50°C return.
It must be appreciated that operating at these reduced flow temperatures will directly reduce the heating output
ability of the Heatstar. If the intention is to operate a condensing boiler at these temperatures, then it will be
necessary to make allowance in the initial selection / design of the project if correct pool room temperatures are
to be maintained at all times.
Boiler water flow speed :
The temperature of the boiler water coming out of the Heatstar should be slightly lower than that going in. This is
because the Heatstar has transferred some of the heat to the pool room air.
If the temperature difference between the
‘in’ pipe and the ‘out’ pipe is greater than 11°C, then the rate of boiler
water flow through the Heatstar is not fast enough to transfer the optimum amount of heat. With condensing type
fuel boilers a 20°C temperature reduction would normally be utilised.
If there is a manual by-pass valve positioned between the
‘in’ pipe and the ‘out’ pipe of the boiler pipe circuit,
then it is possible that the valve requires to be closed slightly more than it is at present. Do not close such a
valve completely as may create problems when the Heatstar no longer requires any heat from the boiler.
Air venting :
If air is present within the boiler water pipe circuit, then this may restrict the flow of heat from the boiler to the
Heatstar and cause the problems described above.
There should be air vents positioned at high points around the boiler pipe work circuit and there is an air vent
positioned on the top of the air heating coil within the Heatstar.
Caution : Very hot water may be sprayed from the air vents and due care must be taken to avoid scalding
and eye damage.
Once the boiler circuit is confirmed to be operating correctly, the air discharged into the pool room by the
Heatstar should be noticeably warm. Check the boiler pipe circuit for water leaks when both warm and cool.