ESIE17-19C | Part 2. Troubleshooting 2.4. Component checklist
Page 58 19/08/19 | Version 1.1
Optimized Heating 4
2.4.2.6. High 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 76).
PROCEDURE
1. Disconnect the high pressure switch connector from applicable PCB, see table "Component checklist" on page 118.
2. Recover the refrigerant.
3. Pressurize the refrigerant circuit at 41.7 bar with nitrogen.
4. Measure the switch contacts between high pressure switch connector: pins 1-2; the switch must be open.
5. Replace the high pressure switch if the contact is not open (refer to "Replacing high pressure switch" on page 94).
6. Lower the refrigerant circuit pressure to 30 bar.
7. Measure the switch contacts between high pressure switch connector: pins 1-2; the switch must be closed.
8. Replace the high pressure switch if the contact is not closed (refer to "Replacing high pressure switch" on page 94).
Technical specification Description
The high pressure switch has a normally closed contact. If the
pressure exceeds 41.7 (+0 / -1) bar the contact will open; if the
pressure drops below 32 (±2) bar the contact will close.
The high pressure switch is a safety component that stops the
compressor if overpressure is detected in the refrigerant circuit.
Location
Piping diagram Wiring diagram Switch box Component overview of unit
See "Outdoor unit" on
page 117.
See "Outdoor unit" on
page 114.
See "Outdoor unit" on
page 118.
See "Outdoor unit" on page 118.
Check procedure
Electrical check
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