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[ IX Troubleshooting ]
- 310 -
HWE09080 GB
(4) In the case of SV9 (Bypass valve)
This solenoid valve opens when energized (when the relay is on)
This valve turns on when the value of 63HS1 is greater than 3.5 MPa [507psi] during Heating-only or Heating-main operation
at the minimum frequency. The valve position can be determined by measuring and monitoring the changes in the pipe tem-
perature on the downstream of SV9 while the unit is energized. When the valve is open, high-temperature gas refrigerant
passes through the pipe. Do not attempt to check the pipe temperature by touching the pipe.
-4- LEV
LEV operation
LEV (Indoor unit: Linear expansion valve), LEV2a, and LEV2b (Heat source unit: Linear expansion valve) are stepping-motor-
driven valves that operate by receiving the pulse signals from the indoor and heat source unit control boards.
(1) Indoor LEV and Heat source LEV (LEV2a, LEV2b)
The valve opening changes according to the number of pulses.
1) Indoor and heat source unit control boards and the LEV (Indoor unit: Linear expansion valve)
1
2
3
4
5
2
3
4
5
Solenoid valve block(three compartments)
1 is located behind
3
Refrigerant Circuit diagram <PQRY>
1
2 3
4
5
ST1
BV1
BV2
Water circuit
CV8
CV6a
TH8
TH7
SV7bSV7a
SV9
CV4a
CV2aCV3a
CV7a
CV5a
SV4a
SV4b
SV4d
Solenoid valve block
THINV
Component cooler
heat exchanger
LEVINV
ST13