Drainage Piping Work; Water Piping Work; Electrical Work - Mitsubishi Electric PUHZ-W HA Series Installationshandbuch

4. Drainage piping work

Outdoor unit pipe connection
When drain piping is necessary, use the drain socket or the drain pan (option).

5. Water piping work

5.1. Water piping connection (Fig.5-1)
• Connect the water pipes to the outlet and inlet pipes.
(Parallel male screw for 1-inch water pipe (ISO 228/1-G1B))
• Inlet and outlet pipes position is shown on the Fig.5-1.
• Install the hydraulic fi lter at the water intake.
• Maximum allowable torque at the water piping connection is 50 N•m.
• Check if water leaks after installation.
• Inlet water gauge pressure must be between 0-0.3MPa.
• Use the inlet water with a temperature lower than 55˚C.
Note :
• The water velocity in pipes should be kept within certain limits of material to avoid
erosion, corrosion and excessive noise generation.
Be aware, and take care of, that local velocities in small pipes, bends and similar
obstructions can exceed the values above.
e.g.) Copper : 1.5 m/s
• When connecting metal pipes made of different materials, be sure to insulate the
joint to prevent electrolytic etching.
• Set up a fi eld system so that the inlet water temperature and water fl ow rate can
be within the allowable range specifi ed in our technical data, etc.
If the unit is used out of the allowable range, the parts of unit might be damaged.
5.2. Water quality condition
• The water in a system should be clean and with a pH value of 6.5-8.0.
• The followings are the maximum values;
Calcium : 100 mg/L
Chlorine : 100 mg/L
Iron/manganese : 0.5 mg/L
[Fig. 5-1]
A Water outlet
B Water inlet

6. Electrical work

6.1. Outdoor unit (Fig. 6-1, Fig. 6-2)
1 Remove the service panel.
2 Wire the cables referring to the Fig. 6-1 and the Fig. 6-2.
Fig. 6-1
Caution:
Be sure to install N-Line. Without N-Line, it could cause damage to unit.
A Interface unit/
Flow temp. controller
B Outdoor unit
C Remote controller
D Main switch (Earth leakage breaker)
E Earth
Optional parts name Model name
Drain socket PAC-SG61DS-E
Drain pan for 50/85 PAC-SG64DP-E
*There is no optional drain pan for 112/140.
Fig. 5-1
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 insuffi cient.
Warning:
As the outlet water temperature can reach 60ºC at maximum, do not touch
the water piping directly with a bare hand.
Fig. 6-2
A Earth terminal
B Terminal block
C Clamp
D Service panel
E Wire the cables so that they
do not contact the center of
the service panel.
■ 50-140V (Single phase)
L N S1 S2 S3
■ 112-140Y (3 phase)
L1 L2 L3 N S 1 S 2 S 3
5