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Monobloc Outdoor Unit
15.5.
High Pressure switch test
These service instructions describe the procedures and products to be used to check the correct operation of HP
switch in system, and verify and record the pressure target of high pressure switch.
Indeed, according to national regulations, check the protection devices on site in accordance with standards EN
378/ISO 5149: once a year for the high-pressure switches, every five years for external relief valves.
The procedure mentions here only the principle of a test without removing the pressure switch:
•
Connect a calibrated pressure gauge (with Schrader female port of ½ UNF)
•
Be ready to switch-off the main disconnect switch (on the unit or on the installation) of the power supply if the
pressure switch does not trigger (avoid over-pressure)
•
Complete an HP Switch Test as provided by the control system function:
Steps
Table
Activate the
HP Switch
QCK_TEST
test
The Rating Mode is implemented for test purpose (Lab tests, ...). When the Rating
Mode is active, Water Control Point is ignored by the control.
The Pump is forced to run during the Rating Mode.
If the test leads to replacing the pressure switch, it is necessary to recover the
refrigerant charge, these pressure switches are not installed on automatic valves
(Schrader type).
At least once a year, visually inspect the protection devices (valves, pressure
switches).
Par.
Designation
321
Quick Test enable
Access to Quick test mode
0 = Rating Off
1 = Rating Cool (set frequency with _RAT_FRQ
parameter)
2 = Rating Heat (set frequency with_RAT_FRQ
parameter)
3 = Ramp Cool (_RAT_FRQ corresponds to the
change rate Hz/min, ramp up if positive,
323
Rating Mode
ramp down if negative).
4 = Ramp Heat (_RAT_FRQ corresponds to the
change rate Hz/min, ramp up if positive, ramp
down if negative).
Note: The Rating Mode is implemented for test
purpose (Lab tests, ...). When the Rating Mode is
active, Water Control Point is ignored by the control.
The Pump is forced to run during the Rating Mode.
0 = HP Test Off
1 = HP Test Requested
2 = HP Test in Progress
3 = HP Test OK
322
HP Switch Test
4 = HP Test Failed due to timeout
5 = HP Test Failed due to Flow Switch Failure
6 = HP Test Failed due to Low Water Temperature
7 = HP Test Failed due to Inverter Failure
8 = HP Test failed due to high TL temperature
Wait until the HP switch test is finished: when [P322] = 3
When the HP Switch test is finished, exit of quick
321
Quick Test enable
test mode
Description
151
Service Manual
Range
Default
Ex.
Unit
0 to 1
0
1
-
0 to 4
0
0
-
0 to 8
0
1
-
0 to 1
0
0
-
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