INVENTOR DHW-C3.5/A1-K, Service Manual

Page: 43 / 52

HEAT PUMP WATER HEATER MAINTENANCE
41
3
ˊ
Mount the heat exchanger
Put the heat exchanger in the
specific position. Match the pipes
corerctly. Avoid hiting other pipe
or parts.
4.Weld heat exchanger
Connect the pipe of heat
exchanger. Wrap the pipe with
wet cloth and weld them.
During welding, charge
nitrogen of 0.5±0.1kgf/cm
2
(relative pressure).
Perform leak test for the
welding spot.
Disassembly and Assembly of Electronic Expansion Valve
Remark: Make sure that there isn’t any refrigerant in pipe system and the power supply is cut off before removal
of the electronic expansion valve.
Step Illustration Handling Instruction
1. Remove the coil of electronic
expansion valve.
Turn the coil clockwise or
counter clockwise so that the boss
breaks away from the dent.
Upturn to remove the coil.
2. Disassemble the electronic
expansion valve
Avoid burning other pipes
during welding.
Remove the electronic
expansion valve carefully. Avoid
hiting other pipes and parts.
During welding, charge
nitrogen of 0.5±0.1kgf/cm
2
(relative pressure).