Mitsubishi Electric PUMY-P125 Manuel d'installation télécharger pdf (Page 9)

4.6. Additional refrigerant charge

Refrigerant of 3 kg equivalent to 50 m total extended piping length is already included

when the outdoor unit is shipped. Thus, if the total extended piping length is 50 m or

less, there is no need to charge with additional refrigerant.

Calculation of Additional Refrigerant Charge

• If the total extended piping length exceeds 50 m, calculate the required additional

refrigerant charge using the procedure shown below.

• If the calculated additional refrigerant charge is a negative amount, do not charge

with any refrigerant.

<Example> (Please see the lower half of Fig. 4-1.)

Outdoor model : 125

Indoor 1 : 63 A : ø9.52 30 m a : ø9.52 15 m

2:40 b: ø6.35 10 m

3:25 c: ø6.35 10 m

4:20 d: ø6.35 20 m

The total length of each liquid line is as follows

ø9.52 : A + a = 30 + 15 = 45 m

ø6.35 : b + c + d = 10 + 10 + 20 = 40 m

Therefore,

Additional refrigerant charge

= 45 × 0.06 + 40 × 0.024 – 3.0 = 0.7 kg (rounded up)

Refrigerant

amount for

outdoor unit

3.0 kg

Liquid pipe size

Total length of

ø6.35 × 0.024

(m) × 0.024 (kg/m)

Additional

refrigerant charge

(kg)

Liquid pipe size

Total length of

ø9.52 × 0.06

(m) × 0.06 (kg/m)

=+–

4. Installing the refrigerant piping

5. Drainage piping work

Outdoor unit drainage pipe connection

When drain piping is necessary, use the drain socket or the drain pan (option).

P100-140

Drain socket PAC-SG61DS-E

Drain pan PAC-SG64DP-E

6.1. Caution

1 Follow ordinance of your governmental organization for technical standard re-

lated to electrical equipment, wiring regulations and guidance of each electric

power company.

2 Wiring for control (hereinafter referred to as transmission line) shall be (5 cm or

more) apart from power source wiring so that it is not influenced by electric noise

from power source wiring. (Do not insert transmission line and power source wire

in the same conduit.)

3 Be sure to provide designated grounding work to outdoor unit.

4 Give some allowance to wiring for electrical part box of indoor and outdoor units,

because the box is sometimes removed at the time of service work.

5 Never connect the main power source to terminal block of transmission line. If

connected, electrical parts will be burnt out.

6 Use 2-core shield cable for transmission line. If transmission lines of different

systems are wired with the same multiple-core cable, the resultant poor transmit-

ting and receiving will cause erroneous operations.

6. Electrical work

7 Only the transmission line specified should be connected to the terminal block for

outdoor unit transmission.

(Transmission line to be connected with indoor unit : Terminal block TB3 for trans-

mission line, Other : Terminal block TB7 for centralized control)

Erroneous connection does not allow the system to operate.

8 In case to connect with the upper class controller or to conduct group operation in

different refrigerant systems, the control line for transmission is required between

the outdoor units each other.

Connect this control line between the terminal blocks for centralized control. (2-

wire line with no polarity)

When conducting group operation in different refrigerant systems without con-

necting to the upper class controller, replace the insertion of the short circuit

connector from CN41 of one outdoor unit to CN40.

9 Group is set by operating the remote controller.

At the conditions

below:

* The figure to the left is an example only.

The stop valve shape, service port po-

sition, etc., may vary according to the

model.

* Turn section A only.

(Do not further tighten sections A and

B together. )

C Charge hose

D Service port

Precautions when using the charge valve (Fig.4-8)

Do not tighten the service port too much when installing it, otherwise, the valve core

could be deformed and become loose, causing a gas leak.

After positioning section B in the desired direction, turn section A only and tighten it.

Do not further tighten sections A and B together after tightening section A.

Fig. 4-8

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 135 136

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Mitsubishi Electric PUMY-P125 Manuel d'installation Page 9

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