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9 FILLING AND VENTING
9.1
Heating system
The heating system is filled with water up to the required pres-
sure, and vented.
•
Vent the system carefully before activating the com-
pressor. Air in the heating system may trigger alarms
in the system.
•
Ensure that the system pressure is appropriate for op-
eration. The pressure must be 0.5 bar during filling
and approximately 0.5–1.0 bar once the reservoir has
warmed up. Check the pressure once the reservoir is
warm.
•
The system must be equipped with an expansion ves-
sel and a safety valve in accordance with the HV
plan.
9.2
Filling the collector, non-pressurised
Fill the collector with a mixture of water and brine that can with-
stand a temperature of at least -15ºC. We recommend bioethanol,
a liquid which is environmentally friendly.
Valves C and D are used for filling a filling group. Valve A must
be closed for the duration of the filling and venting operation.
Fill the system with purified brine. Ensure that any solids pre-
sent at the bottom of the vessel do not rise into the intake pipe.
When circulating liquid with an external filling/venting pump,
ensure that no foam is produced when liquid is pumped into the
system. Where necessary, use two large vessels in order to pre-
vent micro bubbles from entering the collection circuit. The re-
moval of foam or liquid containing micro bubbles from the sys-
tem can be difficult. Micro bubbles can cause equipment failure.
The collection circuit is pressurised using an external booster
pump (K) The pump is connected to valves C and D as shown in
the figure. When increasing the pressure of the collection circuit,
close valve A. Ensure that any solids present at the bottom of the
vessel do not rise into the intake pipe. Monitor the circuit's pres-
sure gauge I. The pressure must not rise above 2 bar.
Clean the filter before activating the heat pump. Close valves A
and B, and open filter E. Rinse the screen under running water.
Close the filter, and open valves A and B.
9.3
Pressure test of the collector
Perform a pressure test on the filled collector as follows: Increase
the pressure to 2bar and check the pressure in 30 minutes. The
system has a leak if the pressure has dropped during this time.
Repair any leaks and repeat the pressure test. Enter the pressure
test as completed in the Commissioning and warranty protocol
after a successful test. Remember to release the high pressure
after the test.
v1-4 22092016
9.4
Venting of the collector's horizontal
piping
When venting the collector, the horizontal piping must be vented
separately by closing the wells out of the venting loop. This pre-
vents air from being circulated via the wells, and thus the air
bubble resulting from pumping does not end up in the well.
When you have vented the horizontal piping by circulating liquid
in both directions, and the liquid is completely clear (not foamy),
you can open the wells for the activation of the ground heat
source pump.
VENTING INDOOR WITH THE VALVE GROUP:
- CONNECT VENTING CONNECTIONS
TOGETHER
- CLOSE THE WELLS FOR THE DURATION OF
VENTING
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