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13. Installation
Refrigerant pipe work on DVM Hydro unit
• Caution for brazing the pipe to a DVM Hydro unit
CAUTION
- When brazing the pipe to the product, the unit may get damaged by the heat and flame from brazing .
Use a flame proofing cloth to protect the unit from a brazing fire or flame .
- Wrap the pipe with a wet cloth and braze it as shown in the illustration . Also, water dripping from the
wet cloth may interrupt the brazing so make sure the water does not drip from the wet cloth .
- Make sure that connected pipes of DVM Hydro unit and the outdoor unit do not interrupt each other or
make contact with the product . (Vibration may cause damage to the pipes .)
- When removing the sealed pipe on the bottom side of the service valve, cut it with a pipe cutter first and
then start the brazing . When the sealed pipe is brazed without cutting, you may get injured by the
refrigerant within the pipe .
1 . Remove the copper cap of the refrigerant pipe and eliminate the sludge or foreign substances on the brazed part and
then braze the connecting pipe on each port .
- Since nitrogen gas is sealed within the pipe, you must discharge the nitrogen gas from the liquid pipe . Then
remove the copper cap and check for existence of the nitrogen gas .
- Check the pressure of the nitrogen gas before brazing . I f the nitrogen gas is not being purged, product is not
normal so do not install it .
Liquid side
2 . Cover the refrigerant pipe well with insulation .
- It prevents the water, on the outer surface of the pipe, from dripping and increase the efficiency of the DVM Hydro unit .
3 . Cut off the leftover insulator .
4 . Check for cracks on the bent part of the pipes .
5 . When the DVM Hydro unit is installed in a hot and humid place, water may form on the outer surface of the insulation so
it would be necessary to double the insulation thickness [10 mm (0 .4 inch) or more] .
Gas side
Copper cap
Wet cloth
Gas pipe
Liquid pipe
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