High Pressure Switch - Daikin FTXTA30AW Service Manual

ESIE17-19C | Part 2. Troubleshooting

2.4.2.6. High pressure switch

Technical specification
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.
Location
Piping diagram
See "Outdoor unit" on
page 117.
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 high pressure switch connector from applicable PCB, see table
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
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
Page 58
Optimized Heating 4
Wiring diagram
See "Outdoor unit" on
page 114.
"Basic removal" on page
Description
The high pressure switch is a safety component that stops the
compressor if overpressure is detected in the refrigerant circuit.
Switch box
See "Outdoor unit" on
page 118.
76).
"Component checklist" on page
"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 118.
118.
94).
94).
19/08/19 | Version 1.1