Additional Refrigerant Charge; Drainage Piping Work; Electrical Work - Mitsubishi Electric CITY MULTI PUMY-P NKMU Series Installation Manual

4. Installing the refrigerant piping
Fig. 4-8
4.6. Additional refrigerant charge
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 additional 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 extended piping.
• 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 calcu-
lated additional refrigerant charge.
(For example, if the calculated charge is 32.92 kg,
round up the charge to 33.0 kg.)
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
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 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 multiplecore cable, the resultant poor transmit-
ting and receiving will cause erroneous operations.
8
* The figure 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
<Additional charge>
Calculation of refrigerant charge
Pipe size
Liquid pipe ø6.35
+
(m) × 0.027 (kg/m)
0.29 (oz/ft)
Included refrigerant amount when shipped from the factory
Outdoor unit model number
P60
Calculation example (Please see the lower half of Fig. 4-1.)
Outdoor model: P60
1: A: P24 ø9.52 [3/8"]/ø19.05 [3/4"]: 30 m [98 ft]
2: P15
3: P08
4: P06
The total length of each pipe size is as follows:
ø9.52 [3/8"]/ø19.05 [3/4"]: A = 30 m [98 ft]
ø9.52 [3/8"]/ø15.88 [5/8"]: a = 15 m [49 ft]
ø6.35 [1/4"]/ø12.7 [1/2"]: b + c + d = 10 m + 10 m + 20 m = 40 m [33 ft + 33 ft + 66 ft = 132 ft]
Therefore, the additional charge is as follows:
= 30 × 0.07 + 15 × 0.07 + 40 × 0.027 + 2.5 [98 × 0.75 + 49 × 0.75 + 132 × 0.29 + 88]
= 6.8 kg [237 oz]
P60
PAC-SG61DS-E
PAC-SH97DP-E
Refrigerant pipes are protectively wrapped
• The pipes can be protectively wrapped up to a diameter of ø90 mm [ø3-35/64 inch]
before or after connecting the pipes. Cut out the knockout in the pipe cover following
the groove and wrap the pipes.
Pipe inlet gap
• Use putty or sealant to seal the pipe inlet around the pipes so that no gaps re-
main.
(If the gaps are not closed, noise may be emitted or water and dust will enter the
unit and breakdown may result.)
Warning:
When installing the unit, securely connect the refrigerant pipes before starting
the compressor.
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.
Total capacity of
Pipe size
Liquid pipe ø9.52 connected indoor units
–42
+
(m) × 0.07 (kg/m)
43–60
0.75 (oz/ft)
61–78
Included refrigerant amount
5.1 kg (11 lbs, 4 oz)
a: ø9.52 [3/8"]/ø15.88 [5/8"] 15 m [49 ft]
b: ø6.35 [1/4"]/ø12.7 [1/2"] 15 m [49 ft]
c: ø6.35 [1/4"]/ø12.7 [1/2"] 15 m [49 ft]
d: ø6.35 [1/4"]/ø12.7 [1/2"] 20 m [66 ft]
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
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 connect-
ing 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.
Amount for the
indoor units
2.0 kg (71 oz)
2.5 kg (88 oz)
3.0 kg (106 oz)
For these piping
lengths