Bleeding The Brine Circuit; Vent Outdoor Unit, Dhp-A, -Al - Danfoss DHP-H Installation And Service Instructions Manual

Filler cock
When the filler cock is installed on the return line, remember to
turn the strainer cover upwards in order to minimise the amount of
air that gets into the brine system when cleaning the filter.
Figure 71:
Position Name
3 Shut-off valve
4 Shut-off valve
5 Shut-off valve
6 Strainer
7 Shut-off valve
Figure 72: Filling the brine system
Position Name
1 Brine out
2 Brine in
3 Shut-off valve (part of the filler cock)
4 Shut-off valve (part of the filler cock)
5 Shut-off valve (part of the filler cock)
6 Strainer (part of the filler cock)
7 Shut-off valve (part of the filler cock)
8 Safety valve 1.5 bar
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, -C, -L)(-32°C for DHP-A, -AL).
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. For DHP-A, -AL: Open the defroster shunt in the control com-
puter menu SERVICE -> MANUAL TEST -> SHUNT DEFR, set the
value to -.
6. Close valve (4).
7. Open valves (5) and (10).
8. Connect a transparent hose (3) that opens out into the external
container (12).
9. Open valve (3).
10. Start the external pump (11) and fill the brine pipes.
Filler cock.
11. Start the brine pump manually in the control computer menu
SERVICE -> MANUAL TEST -> BRINEPUMP, set the value to 1.
12. Run the brine pump and the external pump (11) in series until
fluid, clear of air, comes out of the return hose from the valve
(3).
13. 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.
14. Open valve (4) with the external pump running to eliminate the
air between the valves (3) and (5).
15. Close valve (3) and pressurise the system using the external
pump. NOTE! Max. 150kPa, (1.5bar).
16. Close valve (5).
17. For DHP-A, -AL: close the defroster shunt in the control com-
puter menu SERVICE -> MANUAL TEST -> SHUNT DEFR, set the
value to 0.
18. Stop the external pump (11) and disconnect the filling equip-
ment.
19. Install insulation on the filler cock.
8.8

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).
8.9

Vent outdoor unit, DHP-A, -AL

If the outdoor unit is installed higher than the heat pump with a
pressurised brine system, the outdoor unit must be bled using the
bleed screws on the connection pipes.
The side covers of the outdoor unit must be removed to access the
bleed screws.
Figure 73:
If the outdoor unit is installed at the same level or lower than the
heat pump it is recommended that the brine circuit in the outdoor
unit is also bled.
VMBMA602
Bleed screws
Bleed screw locations.
35