4.4 Checking safety valve discharge pipe
1. Make sure that the discharge pipe installation has been completed, and thus the
open end:
●
is located outside, above the roof levels so that it isn't close to the building's
ventilation holes
●
is directed downwards, or by other means the water prevented from entering
the pipe.
2. Check that the pipe dimension is sufficient.
3. Check that the pipe assembly is according to the local site and country
requirements. Note the discharge pipe dimension.
4. Make sure that the liquid from condensing moisture cannot enter the safety valves.
We recommend usage of drain valve in lowest section (lower than connection to
the heat pump).
5. Make sure that the discharge 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 control cabinet
1. Turn all switches, fuses, and breakers into the
OFF
position.
Use adequate pad lock devices to the breakers to improve occupational safety
so that an outsider can not switch on electricity 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. Check that the
connections are secured using a screw driver.
Verify that all components are correctly installed, tagged, and without damage.
Make notes with a green marker in the circuit diagram.
4. Check and retighten the compressor cables to the following torques.
●
P-series: 10 Nm
●
S-series: 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
.
8. Switch on the power.
9. Check the voltage on the DC supply.
10. Check the cooling fan and filters for the electrical cabinet and for possible frequency
converters.
11. To start the cooling fan, change the temperature set point inside the cabinet.
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