Check that no stress is transferred to the heat exchanger connections of the
heat pump.
9. Start the circulation pump and adjust the possible flow switch limit to approximately
50 % of the nominal flow.
If several heat pumps are connected, adjust the valves to achieve the specified
flow distribution.
10. Make sure that the pipes are vented.
4.4 Checking safety valve blow-off pipe
1. Make sure that the blow-off pipe terminates outdoors. The opening at the end of the
pipe must:
●
be located above the roof level
●
be located away from ventilation intake and exhaust vents
●
point downwards or be otherwise protected against water entering the pipe.
2. Check that the pipe is correctly sized.
3. Check that the pipe assembly is in accordance with local and national rules and
regulations. Pay special attention to blow-off pipe size.
4. Make sure that condensate cannot enter the safety valves.
It is recommended to place a drain valve in the lowest section of the pipe (below
the pipe's connection at the heat pump).
5. Make sure that the blow-off pipe is properly supported.
No stress must be transferred to the heat pump connections.
4.5 Checking refrigerant circuit
1. Make sure that nothing was damaged or loosened during transport.
2. Check screws and flange connections.
3. Check oil and refrigerant levels and make sure that there are no leaking
connections.
Use an electronic sniffer, but note that they usually react on all kinds of
chemicals.
4. To ensure that no moisture is inside the system, check the sight glass.
Green indicates a dry and healthy system.
5. Check the set pressures on the high and low pressure switches.
4.6 Checking electrical connections and the control cabinet
1. Turn all switches, fuses, and breakers into the
OFF
position.
Secure breakers with adequate padlocks. This improves occupational safety
and prevents unrelated personnel from accidentally switching the power on
during work.
2. Refer to the electrical diagrams and visually inspect the electrical cabinets and
connection cables.
3. To check that the cables are firmly connected, pull them randomly. Use a
screwdriver to check that the connections are properly secured.
Verify that all components are correctly installed, tagged, and without damage.
Mark any checked items with a green marker in the circuit diagram.
4. Check and retighten the compressor cables. Tightening torque: 40 Nm.
5. Check conductor protection circuit.
6. Verify the correct phase sequence of the electrical supply.
7. Check the power supply voltage, and compare to the measured values marked in
the
Pre-commissioning certificate
.
EXES01 2150EN
31 (66)
