ESIE17-08 | Part 2. Troubleshooting 2.4. Component checklist
Page 54 15/11/18 | Version 1.1
R32 Sky-Air RZAG-M
2.4.2.6. Low pressure switch
PRELIMINARY ACTIONS
1. Switch off the Daikin unit via the user interface.
2. Switch off the Daikin unit with the field supplied circuit breaker.
3. Remove plate work when required (refer to "Basic removal" on page 67).
PROCEDURE
1. Disconnect the low pressure switch connector from applicable PCB.
2. Recover the refrigerant.
3. Connect vacuum pump to gas service port and vacuum to -0,5 bar.
4. Measure the switch contacts between low pressure switch connector: pins 1-2; the switch must be open.
5. Replace the low pressure switch if the contact is not open (refer to "Replacing high pressure switch" on page 89).
6. Increase the refrigerant circuit pressure to 1 bar.
7. Measure the switch contacts between low pressure switch connector: pins 1-2; the switch must be closed.
8. Replace the low pressure switch if the contact is not closed (refer to "Replacing high pressure switch" on page 89).
Technical specification Description
The low pressure switch has a normally closed contact. If the
pressure drops below -0,31 (±0,2) bar, the contact will open.
When the pressure rises above 0,51 (±0,3) bar the contact will
close again.
The low pressure switch is a safety component that stops the
compressor if under-pressure is detected in the refrigerant circuit.
Location
Piping diagram Wiring diagram Switch box Component overview of unit
See "Outdoor unit" on
page 124.
See "Outdoor unit" on
page 120.
See "Outdoor unit" on
page 129.
See "Outdoor unit" on page 126.
Check procedure
Electrical check
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