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Filling the radiator system
Note that the radiator system must have its own expansion vessel. Open the valve between the cold
water system and the heating system in short bursts and then close it and note the pressure gauge
reading. When the system is full or the right pressure has been reached, vent the system and top it up
if necessary.
Filling of heat transfer fluid
The ground coil or well coils must be filled with a mixture of water and heat transfer fluid until a
freeze protection level of around -15°C is reached as shown in the following table.
The procedure when filling is: (compare the picture on the next page)
• Connect two one inch hoses to both filling valves 1 and 2. One hose has a submersible pump (min 6
m³/h) connected at the other end.
• Both hoses are placed in a barrel with a volume of at least 100 litres. The barrel is filled with a mix-
ture of antifreeze and water. The mixture as shown in the table on the next page.
Always fill water before antifreeze.
• Open valves 1 and 2, shut valve 3. Start the submersible pump (that is equipped with a particle
filter!), and the system fills with liquid. Note that the first litres in the return pipe are usually
contaminated. So collect the first litres in a separate vessel.
• Open the expansion vessel valve until the vessel fills to around 2/3.
• When the level in the barrel has sunk to 25% the submergible pump stops and the barrel fills with the
antifreeze mixture.
• When the system is full and air is no longer coming from the return pipe the system is run for at least
30 minutes. You can also start the heat transfer fluid pump to speed up the air venting. Go into manual
operation in window 5.3 and start pump G3 (P3).
• When venting is ready open valve 3, shut valve 2, and shortly after valve 1. Disconnect the hoses and
the transfer fluid side is ready for operation. Note that a little overpressure in the transfer fluid circuit
is beneficial.
3-way valve, connection
Port B
to radiator.
Port A
to hot water
heater.
Port AB / from heat pump
From heat
pump
To electric
water heater
or radiator.
To electric water heater or radiator.
Connecting a Honeywell 3-way valve.
Connecting a ESBE 3-way valve.
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