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4. Installing the refrigerant piping
Fig. 4-9
Additional refrigerant charge
Refrigerant for the extended piping is not included in the outdoor unit when the unit is
shipped from the factory. Therefore, charge each refrigerant piping system with addi-
tional refrigerant at the installation site. In addition, in order to carry out service, enter
the size and length of each liquid pipe and additional refrigerant charge amounts in
the spaces provided on the "Refrigerant amount" plate on the outdoor unit.
Calculation of additional refrigerant charge
Calculate the additional charge using the liquid pipe size and length of the ex-
tended piping and total capacity of connected indoor units.
Calculate the additional refrigerant charge using the procedure shown to the
right, and charge with the additional refrigerant.
For amounts less than 0.1 kg, round up the calculated additional refrigerant
charge.
(For example, if the calculated charge is 6.01 kg, round up the charge to 6.1 kg.)
Outdoor unit drainage pipe connection
When drain piping is necessary, use the drain socket or the drain pan (option).
Drain socket
Drain pan
6. Electrical work
6.1. Caution
1 Follow ordinance of your governmental organization for technical standard
related 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
[2 inch] or more) apart from power source wiring so that it is not in uenced 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
ever connect the main power source to terminal block of transmission line. If
connected, electrical parts will be burnt out.
6
se 2-core shield cable for transmission line. If transmission lines of different
systems are wired with the same multiplecore cable, the resultant poor trans-
mitting and receiving will cause erroneous operations.
10
* The gure to the left is an example
only.
The stop valve shape, service port
position, 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
PAC-SG61DS-E
PAC-SH97DP-E
4.6. Stop valve opening method
The stop valve opening method varies according to the outdoor unit model. se the
appropriate method to open the stop valves.
(1) Gas side (Fig. 4-7)
1 Remove the cap, pull the handle toward you and rotate 1/4 turn in a counterclock-
wise direction to open.
2 Make sure that the stop valve is open completely, push in the handle and rotate
the cap back to its original position.
(2) Liquid side (Fig. 4-8)
1 Remove the cap and turn the valve rod counterclockwise as far as it will go with
the use of a 4 mm [3/16"] hexagonal wrench. Stop turning when it hits the stopper.
2 Make sure that the stop valve is open completely and rotate the cap back to its
original position.
Precautions when using the charge valve (Fig. 4-9)
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.
Warning:
starting the compressor.
<Additional Charge>
Calculation of refrigerant charge
Liquid pipe
Liquid pipe
+
Included refrigerant amount when shipped from the factory
Included refrigerant amount
4.8 kg (169 oz)
Example
Outdoor model : P MY-P48
M 1
Indoor 1 : model 24 A : 9.52 30 m a : 9.52 15 m (49 ft)
2 : model 15
3 : model 08
4 : model 08
The total length of each liquid line is as follows:
9.52 : A + a = 30 + 15 = 45 m (148 ft)
6.35 : b + c + d = 10 + 10 + 20 = 40 m (131 ft)
The total capacity of connected indoor unit is as follows:
24 + 15 + 08 + 08 = 55
Calculation example
Additional refrigerant charge
19.0
50.0
+ 45 ×
+ 3.0 = 6.1 kg (rounded up)
40 ×
1000
1000
(131 × 0.21 + 148 × 0.55 + 106 = 215 oz)
7 Only the transmission line speci ed should be connected to the terminal block
for outdoor unit transmission.
(Transmission line to be connected with indoor unit : Terminal block TB3 for
transmission 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 C 41 of one outdoor unit to C 40.
9 Before turning outdoor unit on, be sure to turn the indoor units and the branch
boxes.
Total capacity of
Amount for the
connected indoor units
indoor units
+
27
1.5 kg (53 oz)
28
54
2.5 kg (88 oz)
55
62
3.0 kg (106 oz)
b : 6.35 10 m (33 ft)
At the conditions
c : 6.35 10 m (33 ft)
below:
d : 6.35 20 m (66 ft)
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