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HeatMaster 150 Jumbo
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USER GUIDE
Heating system pressure
From time to time you may need to top up the heating
system pressure.This pressure is indicated by the combined
temperature and pressure gauge on the boiler control
panel.
The minimum pressure when the boiler is cold should be
1 bar.The precise operating pressure required depends on
the height of the building, and your installer will have
informed you of this value at the time of installation
(see
Commissioning Section - Filling the hot water and heating circuits)
.
If the pressure falls below 1 bar, the boiler water pressure
switch will turn the boiler off until pressure is restored.
To re-pressurise, the system needs to be topped up with
water.
First, switch the boiler OFF on the on/off switch and isolate
the external electrical supply.Then remove the casing top
front panel by pulling it forward. The filling valves “A” and
“B” can now be seen. Open both valves and allow the
system to fill. When the combined temperature and
pressure gauge shows the required pressure, close both
valves. Replace the casing top front panel. Restore the
power supply and switch the boiler on.
Safety Valves
If water discharges from any of the safety valves, switch the boiler
off and call a service engineer.
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HeatMaster 70 N and 100 N
B
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HeatMaster 60 N