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4.5 Pressure Relief Valve
The requirements recommended for the pressure relief valve are
as follows:
The pressure relief valve is calibrated to be activated at a
●
maximum pressure of 3 bar, and all the pipes and connections
must therefore be able to withstand pressures of up to 3 bar.
Connect the pressure relief valve drain to a tube with a
●
diameter of at least Ø15 mm. It must tilt in a downstream
direction throughout its entire length, and the water must run
off to a suitable drain. It must be positioned so as not to cause
damage to cabling, electrical equipment or persons.
The drain must not be located above a window, entry door or
●
any other public access point. Bear in mind that boiling water
or steam could come out when draining.
4.6 Filling the System
Before filling the boiler pipes, pull up the air flue cap to allow the
pipes to fill properly. Press the cap back in when the pipes are
full.
Ensure that the flue cap is fitted before testing or
Note
●
operating the system.
To perform an air purge after initially filling the
●
boiler pipes, the pump will run for 5 minutes and
20 seconds. The boiler will operate normally after
performing an air purge.
Air Flue Cap
4.7 Testing the Water System
WARNING
Ensure that the boiler is full of water before firing the burner.
Operating the unit without filling it will damage the boiler.
Such damage is not covered by the warranty, and may result
in property damage or severe personal injury.
Perform a fill test after installing the boiler's water system to
make sure that the system has been installed properly. Follow
the instructions below to perform a fill test on the water system.
1. Close the manual air flues and the boiler drain valve.
2. Fill the boiler. The correct pressure will vary with each
application.
3. If the pressure is lower than the minimum pressure set (1 bar
by default), error code E302 will appear on the display.
4. Fill the boiler with more water until the error message
disappears.
5. At initial fill and during boiler start-up and testing, check
the system thoroughly for leaks. Repair any leaks before
proceeding further.
WARNING
Eliminate all system leaks. The continual introduction of fresh
makeup water will reduce boiler life. Minerals can build up in
the heat exchanger, reducing heat transfer, overheating the
heat exchanger and causing heat exchanger failure.
CAUTION
Before operating the boiler for the first time, ensure that the
boiler system is filled with water. Purge the air inside the
system to avoid damage to the boiler.
Installing the System Piping
23
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