4. Drainage piping work. Mitsubishi Electric PUHZ-HW50HA

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 speci fi ed in our technical data, etc.

If the unit is used out of the allowable range, the parts of unit might be damaged.

Optional parts name

Drain socket

Drain pan for 50/85

Model name

PAC-SG61DS-E

PAC-SG64DP-E

*There is no optional drain pan for 112/140.

Fig. 5-1

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

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 insuf fi cient.

Warning:

As the outlet water temperature can reach 60ºC at maximum, do not touch the water piping directly with a bare hand.

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.

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)

A Interface unit/

Flow temp. controller

B

Outdoor unit

C Remote controller

D Main switch (Earth leakage breaker)

E Earth

Fig. 6-1

Caution:

Be sure to install N-Line. Without N-Line, it could cause damage to unit.

L N S1 S2 S3

Fig. 6-2

■ 112-140Y (3 phase)

L1 L2 L3 N S 1 S 2 S 3

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6. Electrical work

6.2. Field electrical wiring

Outdoor unit model

Outdoor unit power supply

Outdoor unit Circuit Breaker capacity

Outdoor unit power supply, earth

Interface unit/Flow temp. controller-Outdoor unit

Interface unit/Flow temp. controller-Outdoor unit earth

Remote controller-Interface unit/Flow temp. controller

*1

*2

*2

Outdoor unit L-N (single)

Outdoor unit L1-N, L2-N, L3-N (3 phase)

*3

Interface unit/Flow temp. controller-Outdoor unit S1-S2 *3

Interface unit/Flow temp. controller-Outdoor unit S2-S3 *3

Remote controller-Interface unit/Flow temp. controller *3

50V 85V 140V 112Y, 140Y

~/N (single), 50 Hz, 230 V ~/N (single), 50 Hz, 230 V ~/N (single), 50 Hz, 230 V 3N~ (3 phase), 50 Hz, 400 V

16 A

3 × Min. 1.5

25 A

3 × Min. 4

40 A

3 × Min. 6

16 A

5 × Min. 1.5

3 × 1.5 (polar)

1 × Min. 1.5

2 × 0.3 (Non-polar)

3 × 1.5 (polar)

1 × Min. 1.5

2 × 0.3 (Non-polar)

3 × 1.5 (polar)

1 × Min. 1.5

2 × 0.3 (Non-polar)

3 × 1.5 (polar)

1 × Min. 1.5

2 × 0.3 (Non-polar)

AC 230 V

AC 230 V

DC 24 V

DC 12 V

AC 230 V

AC 230 V

DC 24 V

DC 12 V

AC 230 V

AC 230 V

DC 24 V

DC 12 V

*1. A breaker with at least 3.0 mm contact separation in each poles shall be provided. Use earth leakage breaker (NV).

*2. Max. 80 m

*3. The fi gures are NOT always against the ground.

S3 terminal has DC 24 V against S2 terminal. However between S3 and S1, these terminals are NOT electrically insulated by the transformer or other device.

AC 230 V

AC 230 V

DC 24 V

DC 12 V

Notes: 1. Wiring size must comply with the applicable local and national codes.

2. Power supply cables and the cables between Interface unit/Flow temp. controller and outdoor unit shall not be lighter than polychloroprene sheathed fl exible cables. (Design 60245 IEC 57)

3. Be sure to connect the cables between Interface unit/Flow temp. controller and outdoor unit directly to the units (no intermediate connections are allowed).

Intermediate connections may result in communication errors. If water enters at the intermediate connection point, it may cause insuf fi cient insulation to ground or a poor electrical contact .

(If an intermediate connection is necessary, be sure to take measures to prevent water from entering the cables.)

4. Install an earth longer than other cables.

5. Do not construct a system with a power supply that is turned ON and OFF frequently.

Power supply

Isolator

3 poles isolator

Outdoor Unit

S1

S2

S3

S1

S2

Interface unit /

Flow temp. controller

S3

Warning:

In case of A-control wiring, there is high voltage potential on the S3 terminal caused by electrical circuit design that has no electrical insulation between power line and communication signal line. Therefore, please turn off the main power supply when servicing. And do not touch the S1, S2, S3 terminals when the power is energized. If isolator should be used between indoor unit and outdoor unit, please use 3-pole type.

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