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Third party components
Service manual
367
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
To check for non-condensables in the refrigerant circuit
Prerequisite:
Stop the unit operation via the central controller.
Prerequisite:
Turn OFF the respective circuit breaker.
1
Wait for the refrigerant to reach the outdoor temperature.
2
Connect a manometer to the service port.
3
Measure the pressure of the refrigerant. The measured pressure converted
into saturated temperature MUST be in line with the expected pressure /
saturated temperature at current ambient temperature.
4
If the measured pressure is significantly higher (>5K), non‑condensables
gasses are most likely present in the refrigerant.
Any non‑condensables found in the
refrigerant circuit?
Action
Yes
To replace the refrigerant, see
No
Return to the troubleshooting of the
specific error and continue with the
next procedure.
To perform a leak test
The leak test must satisfy the specifications of EN378‑2.
1
Perform the two leaks tests below.
To check for leaks: Vacuum leak test
1
Evacuate the system from the liquid and gas piping to –100.7 kPa (–1.007 bar)
(5 Torr absolute) for more than 2 hours.
2
Once reached, turn off the vacuum pump and check that the pressure does
not rise for at least 1 minute.
3
Should the pressure rise, the system may either contain moisture (see vacuum
drying below) or have leaks.
To check for leaks: Pressure leak test
1
Test for leaks by applying a bubble test solution to all piping connections.
2
Discharge all nitrogen gas.
3
Break the vacuum by pressurising with nitrogen gas to a minimum gauge
pressure of 0.2 MPa (2 bar). Never set the gauge pressure higher than the
maximum operation pressure of the unit, i.e. 4.0 MPa (40 bar).
Summary of Contents for VRV IV+
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