Water Piping Work - Mitsubishi Electric ecodan PUHZ-W50VHA2 User Manual

INSTALLATION: OUTDOOR UNIT

Water Piping Work

WATER PIPING CONNECTION:
Connect the water pipes to the outlet and inlet pipes (ISO 228/1-
G1B)
Inlet and outlet pipes position is shown on Fig 3.3
Install the hydraulic filter at the water intake
Maximum allowance torque at the water piping connection is 50N/m
Check if water leaks after installation
Inlet water gauge pressure must be between 0-0.3MPa
Use the inlet water of higher than 5°C and lower than 55°C
Note: The water velocity in pipes should be kept within certain limits of the
material to avoid erosion, corrosion and excessive noise generation. Be
aware, and take care of velocities in small pipes, bends and similar
obstructions that can exceed the values above.
E.g. Copper : 1.5m/s
WATER QUALITY CONDITION:
The water in a system should be clean and with a pH value of 6.5-8.0
The following are the maximum values:
- Calcium: 100mg/L
- Chlorine: 100mg/L
- Iron/Manganese: 0.5mg/L
Note: Make sure to perform the frozen prevention measure for water pipe system. (Water piping insulation,
back-up pump system, using of a certain % ethylene glycol instead of normal water). Insulate the water piping
properly. The performance can be poor if the insulation is insufficient.
WARNING
The outlet water temperature can reach 60°C at maximum, do not touch the water piping directly with bare
hands.
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A Water Outlet
B Water Inlet
Fig. 3.3
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