Filling Water In The Heating System; Filling The Heat Transfer Fl Uid In The Collector Hose - Bosch EHP 6-11 LW User And Installation Manual

Filling water in the heating system

This is what to do:
1. Open and close the tap between the cold water system and the heating
system in short time intervals.
2. Read the pressure on the pressure gauge.
3. Vent the system and refi ll to the correct pressure.
Filling the heat transfer fl uid in the collector
hose
The collector hose is fi lled with heat transfer fl uid to be able to collect heat
from the ground. The fl uid is a mixture of water and anti-freeze. It should
have a freezing point of approximately -15ºC.
Proceed as follows to fi ll the collector hose with heat transfer fl uid:
See the illustration on the next page.
1. Connect two hoses (1 inch in diameter) to both fi lling valves 1 and 2.
One of the hoses should have a submerged pump connected at the
other end. Pump submersible with a minimum delivery pressure of 450
kPa. Minimum fl ow: 4 m³/h, type Wilo-Sub TWU 5-SE. The submerged
pump should be fi tted with a particle fi lter.
2. Place the hose and submerged pump in a barrel that holds 100 litres.
3. Fill the barrel with heat transfer fl uid. The relation between water and
heat transfer fl uid can be found in the tables 1 and 2. Fill the water
before anti-freeze liquid. Before starting up the pump, mix the anti-
freeze liquid in the tank to ensure a uniform mix.
4. Open valves 1 and 2 and close valve 3.
Repeat points 5-8 for each circuit. The other circuits must be closed.
5. Start the submerged pump. The circuit is automatically fi lled with heat
transfer fl uid.
6. When the fl uid level has dropped to 50 per cent in the barrel, stop the
submerged pump and fi ll the barrel with more anti-freeze mixture.
Connecting the heat pump to the heating system
The fi rst litres from the return pipe
are often contaminated. Therefore
collect these litres in a separate tank.
59
Note