Mitsubishi Electronics R410A Drainage piping work, Electrical work, Additional refrigerant charge

4. Installing the refrigerant piping

* 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

DService port

Fig. 4-8

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.

4.6. Additional refrigerant charge

Refrigerant of 3 kg [6.6 lbs] equivalent to 50 m [165 ft] total extended piping length is already included when the outdoor unit is shipped. Thus, if the total extended piping length is 50 m [165 ft] 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 [165 ft], 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.

<Additional Charge>

Additional		Liquid pipe size		Liquid pipe size		Refrigerant
refrigerant charge		Total length of		Total length of		amount for
	=	ø9.52 ⋅ 0.06 kg	+	ø6.35 ⋅ 0.024 kg	–	outdoor unit
		[3/8" ⋅ 0.041 lbs]		[1/4" ⋅ 0.016 lbs]
kg		(m) ⋅ 0.06 (kg/m),		(m) ⋅ 0.024 (kg/m),		3.0 kg
[lbs]		[ft] ⋅ 0.041 [lbs/ft]		[ft] ⋅ 0.016 [lbs/ft]		[6.6 lbs]

<Example>
(Please see the lower half of Fig. 4-1.)
Outdoor model : P48
Indoor
1: P24 A: ø9.52 [3/8"] 30 m [98 ft]	a : ø9.52 [3/8"]	15 m [49 ft]	At the
2: P15	b : ø6.35 [1/4"]	10 m [33 ft]
			conditions
3: P08	c : ø6.35 [1/4"]	10 m [33 ft]
			below:
4: P06	d : ø6.35 [1/4"]	20 m [66 ft]

The total length of each liquid line is as follows

ø9.52 [3/8"] : A + a = 30 m + 15 m = 45 m [98 ft + 49 ft = 147 ft]

ø6.35 [1/4"] : b + c + d = 10 m + 10 m + 20 m = 40 m [33 ft + 33 ft + 66 ft = 132 ft] Therefore,

<Calculation example> Additional

refrigerant charge = 45 m ⋅ 0.06 kg + 40 m ⋅ 0.024 kg – 3.0 kg = 0.7 kg (rounded up) = [147 ft ⋅ 0.041 lbs + 132 ft ⋅ 0.016 lbs – 6.6 lbs = 1.54 lbs]

5. Drainage piping work

Outdoor unit drainage pipe connection

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

Drain socket

Drain pan

P36·P48

PAC-SG61DS-E

PAC-SG64DP-E

6. Electrical work

6.1. Caution

1Follow ordinance of your governmental organization for technical standard re- lated to electrical equipment, wiring regulations and guidance of each electric

power company.

2Wiring for control (hereinafter referred to as transmission line) shall be (5 cm [2 inch] or more) apart from power source wiring so that it is not influenced by elec- tric noise from power source wiring. (Do not insert transmission line and power

source wire in the same conduit.)

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

4Give 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.

5Never connect the main power source to terminal block of transmission line. If connected, electrical parts will be burnt out.

6Use 2-core shield cable for transmission line. If transmission lines of different systems are wired with the same multiplecore cable, the resultant poor transmit- ting and receiving will cause erroneous operations.

7Only 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.

8In 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.

9Group is set by operating the remote controller.

8