Water Heat Exchanger Assembly And Check Valve Replacement Instructions - Mitsubishi Electric PQHY-P72TYHMU-A Service Handbook

[ IX Troubleshooting ]
1. Water heat exchanger assembly and check valve (CV8) replacement instructions
* The following describes the procedures for replacing the water heat exchanger assembly and check valve (CV8).
1. Applicable models
• PQHY-P72, 96, 120YHMU-A
• PQRY-P72, 96, 120YHMU-A
2. Parts to be serviced, Set-contents
No. Parts to be replaced
1 Water-cooled heat
exchanger assembly
2 Check valve (CV8)
3. Procedures
* Precautions for starting replacement
• Check that the main power supply is OFF.
• Check that no refrigerant is in the heat source unit.
Remove each part according to the 1)-3) procedures on the next page before replacing service parts.
Mount the removed parts back in place in a reversed procedures of 1)-3) on the next page after replacing service
parts.
(1) Water-cooled heat exchanger assembly replacement procedures
Removal procedures
Remove the duct, solenoid valve block support, and INV heat exchanger support.
1
2 Hand the solenoid valve block support with wire from the beam so that it will not fall.
Remove the fastening plate and the screws holding the water-cooled heat exchanger, and
3
remove the braze
Pull the water-cooled heat exchanger forward toward the front of the unit.
4
Installation procedures
6 Install the water-cooled heat exchanger included in the replacement parts kit
7
Reinstall the fastening plate, fixing screws, INV heat exchanger support, solenoid valve block
support, and the duct.
* Precautions for replacing water-cooled heat exchanger assembly
• Be sure to perform no-oxidation brazing when brazing.
• After brazing, check the condition around the brazing. After confirming no leakage, evacuate the air
inside. (*1)
• Perform brazing with care of the flame direction so that it does not burn cables and plates etc. in the unit.
*1: Refer to Chapter I [8] Vacuum Drying (Evacuation) for detailed procedure.
HWE09080
Required materials
Water-cooled heat exchanger service parts kit
[Kit contents]
Instructions sheet
Water-cooled heat exchanger assembly
Check valve service parts kit
[Kit contents]
Instructions sheet
Check valve assmbly
Connecting pipe
- 349 -
Qty.
1 kit
1
1
1 kit
1
1
1
GB