Low Pressure Switch - Daikin R32 Sky-Air RZAG-M Service Manual

ESIE17-08 | Part 2. Troubleshooting

2.4.2.6. Low pressure switch

Technical specification
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.
Location
Piping diagram
See "Outdoor unit" on
page 124.
Check procedure
Electrical check
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
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
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
Page 54
R32 Sky-Air RZAG-M
Wiring diagram
See "Outdoor unit" on
page 120.
"Basic removal" on page
Description
The low pressure switch is a safety component that stops the
compressor if under-pressure is detected in the refrigerant circuit.
Switch box
See "Outdoor unit" on
page 129.
67).
"Replacing high pressure switch" on page
"Replacing high pressure switch" on page
2.4. Component checklist
Component overview of unit
See "Outdoor unit" on page 126.
89).
89).
15/11/18 | Version 1.1