Filling The Brine System; Bleeding The Brine Circuit - Danfoss DHP-H Installation And Service Instructions Manual

7 .5 Filling the brine system
NOTE! Before filling the brine system, the electrical installa-
⚠
tion must be completed so that it is possible to operate the
brine pump.
NOTE! Always check local rules and regulations before using
⚠
anti-freeze.
NOTE! Use anti-freeze with corrosion protection additives,
⚠
mixed to achieve frost protection down to -15°C.
NOTE! Use only ethylene glycol anti-freeze for DHP-A, mixed
⚠
to achieve frost protection down to -32°C.
Calculated volume, DHP-H, DHP-C, DHP-L
The volume of the brine system is calculated as follows:
• Heat pump (exchanger and piping) approximately 2 litres
• Expansion tank approximately 3 litres
• Collector (single pipe): PEM 40 approximately 1.0 litre/m; PEM 32
approximately 0.6 litre/m; Cu 28 approximately 0.5 litre/m
Calculated volume, DHP-A
The volume of the brine system is calculated as follows:
• Heat pump (exchanger, pipe and outer jacket) approximately 47
litres
• Expansion tank approximately 3 litres
• Outdoor unit approximately 7 litres
• Collector (single pipe): 28 mm pipe approx. 0.5 litre/m
Filling kit
When the filling kit is installed on the return pipe, remember to turn
4
3
the strainer cover upwards in order to minimise the amount of air
that gets into the brine system when cleaning the filter.
Figure 41: Filling kit .
Position Name
3 Shut-off valve
4 Shut-off valve
5 Shut-off valve
6 Strainer
7 Shut-off valve
Figure 42: Filling the brine system
Position Name
24
6 7
5
RUM 20C
INGET BEHOV VÄRME
DRIFT AUTO
1 Return pipe, brine
2 Supply pipe, brine
3 Shut-off valve (part of the filling kit)
4 Shut-off valve (part of the filling kit)
5 Shut-off valve (part of the filling kit)
6 Strainer (part of the filling kit)
7 Shut-off valve (part of the filling kit)
8 Safety valve (3 bar) (1.5 bar for DHP-A)
9 Bleed and expansion tank
10 Shut-off valve
11 External pump
12 External container
1. Set the heat pump operating mode to "OFF" in the control com-
puter menu INFORMATION -> OPERAT.
2. Mix water and anti-freeze in the correct proportions in an exter-
nal container (12). Note that each pack must be well mixed.
3. Check that the freezing point of the mixture is reached using a
refractometer (-15°C for DHP-H, DHP-C, DHP-L)(-32°C for DHP-A).
4. Fill the system with the mixture using an external pump (11)
which can bleed the brine pipes. Connect the pressure side of
the pump to the filler connection at valve (5).
5. Close valve (4).
5. Open valves (5) and (10).
6. Open valve (3) and connect a transparent hose that opens out
into the external container (12).
7. Start the external pump (11) and fill the brine pipes.
8. Start the brine pump manually in the control computer menu
SERVICE -> MANUAL TEST -> BRINEPUMP, set the value to 1.
9. Run the brine pump and the external pump (11) in series until
fluid, clear of air, comes out of the return hose from the shut-off
valve (3).
10. Stop the brine pump in the control computer menu SERVICE
-> MANUAL TEST -> BRINEPUMP, set the value to 0, at the same
time leave the external pump running.
11. Open valve (4) with the external pump running to eliminate the
air between the valves (3) and (5).
12. Close valve (3) and pressurise the system using the external
pump. NOTE! Max . 150kPa (1 .5bar).
13. Close valve (5).
14. Stop the external pump (11) and disconnect the filling equip-
ment.
15. Install insulation on the filling kit.
7 .6 Bleeding the brine circuit
⚠
NOTE! When topping up, the brine pump must be running.
1. Start the brine pump in the control computer menu SERVICE ->
MANUAL TEST -> BRINEPUMP, set the value to 1.
2. Check that the level in the bleed tank (9) is stabilised.
3. Dismantle the safety valve (8) on the bleed tank.
4. Top up with brine to 2/3 of the tank through the connection on
which the safety valve (8) was installed.
5. Leave the brine pump running so that that the air in the system
collects in the bleed tank.
6. As air separates in the bleed tank the fluid level drops, top up as
in step 4.
7. Reinstall the valve (8) when all air has been removed from the
system.
8. Open valve (8) and release any overpressure. The fluid level
should not fall below 2/3 of the height of the tank.
9. Check that valve (3) is closed.
10. Stop the brine pump in the control computer menu SERVICE ->
MANUAL TEST -> BRINEPUMP, set the value to 0.
11. Switch to the desired operating mode if the heating system has
been filled and bled.
Collect any excess brine in a plastic container for topping up the
system if necessary (leave it with the customer).
VMBMA102