150
9
Replacement Procedure
In order to replace the electronic expansion valve for main circuit (EEV) or motor operated valve for hot gas (MOV)
main unit, be sure to perform the fully closed pulse detection operation. (The reason is that the pulse to fully close
the EEV and MOV varies.)
Replace the EEV and MOV main units in accordance with the following procedures.
Procedure for Replacing EEV (for main circuit) and MOV (for hot gas)
２
The replacement is complete with test run and check.
YES
NO
1. Install the spare EEV (or MOV).
2. Attach the strainer to the inlet pipe. (*1)
3. Wrap the EEV (or MOV) main unit with wet cloth
(in order to prevent rise in temperature during
brazing).
4. Braze the inlet pipe and outlet pipe while
injecting nitrogen gas.
5. Mount the EEV (or MOV) coil. (*2)
6. After vacuuming, charge the normal quantity of
refrigerant (R410A).
1. Recover the refrigerant (R410A).
2. Remove the heat insulating materials and thermistor
related to the EEV (or MOV).
3. Disconnect the brazed sections from the inlet and outlet
pipes of the EEV (or MOV).
4. Remove the strainer from the inlet pipe.
Is the
malfunction code “ E9 ”
displayed?
Set to “1%” (*3),
and run for approx.
five minutes. Then,
retry.
<Removing the main unit and coil of the EE valve
(for main circuit) and MO valve (for hot gas)>
Input “0” as data of parameter n024 in parameter
setting mode. (For setting procedure, refer to page 64.)
↓
The “Pulse detection operation with EEV (MOV) fully
closed” will be automatically initiated, and completed in
approximately five minutes.
* Automatically detects fully closed pulses of EEV and
MOV.
<Pulse detection operation with EEV (MOV)
fully closed>
Refer to page 116 "Check 2" to check the motor
operated valve.
<Check the motor operated valve>
<Installing the main unit and coil of the EE valve
(for main circuit) and MO valve (for hot gas)>
*3: For the setting procedure,
refer to page 61.
*1: For the mounting direction,
refer to figure shown
above.
*2: Securely insert the coil
until you hear it click.
EE valve (Y1E: for
(Y2E: for hot gas)) coil
EE valve for main
circuit (MO valve for
hot gas) main unit
Brazing
Strainer
(Outlet pipe)
(Inlet pipe)
<EE valve for main circuit (MO valve for hot gas)>
EEV outlet
thermistor
(Th-8)
00_PB00540A_M10.indb 150 2023/08/09 12:59:26
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