3
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Components
Service manual
241
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
INFORMATION
If non-return valve a is blocked:
▪
Discharge pressure will increase.
▪
Liquid pressure will drop
▪
R4T and R5T temperatures will rise.
▪
R3T and to R7T temperatures will be drastically lower compared to R4T and R5T.
Is the non-retune valve a blocked
Action
Yes
Replace the non-return valve a, see
No
Continue with the next step.
INFORMATION
If non-return valve c is blocked:
▪
Discharge pressure will increase.
▪
Liquid pressure will drop.
▪
R4T and R5T temperatures will rise.
▪
R7T will be drastically lower compared to R3T, R4T and R5T.
Is the non-retune valve c blocked
Action
Yes
Replace the non-return valve c, see
No
Continue with the next step.
NOTICE
Below check procedure will only be relevant if indoor units are in heating mode with
high load condition (Y4S and Y5S MUST be ON).
6
Force the indoor unit into heating mode with high load condition.
7
Check liquid pressure by a manifold on liquid stop valve.
8
Check suction pressure using the service monitoring tool or field setting mode
1-43. Make sure the refrigerant low pressure sensor is NOT faulty. See
333].
Check R3T, R4T, R5T and R7T thermistor read-outs. Check thermistor read-outs
using the service monitoring tool. Make sure all thermistors are operating
normally. See
348].
INFORMATION
If non-return valve b is blocked:
▪
Liquid pressure and also discharge pressure will increase.
▪
Suction pressure will drop.
▪
R3T, R4T and R5T temperatures will be drastically lower compared to R7T .
Is the non-retune valve b blocked
Action
Yes
Replace the non-return valve b, see
No
Continue with the next step.
Summary of Contents for VRV IV+
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