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3. System component
[Fig. 3.0.1] (P.2)
A Air handling unit controller (PAC-AH · M-G)
B Air handling unit (field supply)
C Controller (field supply)
D Outdoor unit
E Indoor unit (City Multi)
F Evaporator (field supply)
G Gas pipe
H Liquid pipe
I LEV-kit
J Thermistor (gas pipe)
K Thermistor (liquid pipe)
L Thermistor (inlet air)
3.1. Selection of the evaporator (air handling
unit)
3.1.1. Compressive strength
The design pressure of this system is 4.15MPa. The compressive strength of the
evaporator and of other pipes must exceed 12.45MPa (=4.15 × 3).
3.1.2 Contamination control
Control the contamination to keep proper quality of the models using HFC refriger-
ant.
Contamination
Residual water content
The content shall be less than [10 mg/lit.].
Residual oil content
The low residual oil pipe [0.5 mg/m or less] shall
be used for heat exchangers.
For long piping connected or piping tended to be
stagnated with oil, the content shall be less than
[3 mg/m]. For other piping, [9 mg/m or less] shall
be applied.
Residual foreign substance
The content shall be less than [25 mg/m
(including residual machining
oil content)
Others
No chlorine content shall be found inside the
refrigerant circuit.
4. Selecting an installation site and installing the controller
•
Avoid locations in direct sunlight.
•
Avoid locations exposed to stream or oil vapour.
•
Avoid locations where combustible gas may leak, settle or be generated.
•
Avoid installation near machines emitting high-frequency waves.
•
Avoid places where acidic solutions are frequently handled.
•
Avoid places where sulphur-based or other sprays are frequently used.
5. Refrigerant pipe specifications
To avoid dew drops, provide sufficient antisweating and insulating work to the re-
frigerant and drain pipes.
When using commercially available refrigerant pipes, be sure to wind commer-
cially available insulating material (with a heat-resisting temperature of more than
100 °C and thickness given below) onto both liquid and gas pipes.
Be also sure to wind commercially available insulating material (with a form
polyethylene's specific gravity of 0.03 and thickness given below) onto all pipes
which pass through rooms.
1 Select the thickness of insulating material by pipe size.
Pipe size
6.4 mm to 25.4 mm
28.6 mm to 38.1 mm
8
Content
2
].
Insulating material's thickness
More than 10 mm
More than 15 mm
3.1.3 Specifications of the evaporator
Select the evaporator (field supply) according to the table below.
Caution:
If not, malfunction of the outdoor unit may be caused.
Type
Allowed evaporator
Unit size
(Air handling unit)
capacity
PAC-AH63M-G
P63
4.6 ~ 7.1 kW
PAC-AH125M-G
6.7 ~ 8.0 kW
P71
P80
7.3 ~ 9.0 kW
8.6 ~ 11.2 kW
P100
P125
10.1 ~ 14.0 kW
PAC-AH140M-G
P140
11.2 ~ 16.0 kW
PAC-AH250M-G
15.9 ~ 22.4 kW
P200
P250
18.7 ~ 28.0 kW
Saturated refrigerant temperature at exit of evaporator = 8.5 °C, SH=5K, liquid
temperature = 25 °C, air = 27 °CDB/19 °CWB
*
When the diameter of the heat exchanger tube is ø9.52
Caution:
The evaporator must be used within the following temperature range.
Inlet air temperature range of the air handling unit: 15-24 ˚CWB (cooling only)
4.1. Combining indoor units with outdoor
units
For combining indoor units with outdoor units, refer to the outdoor unit installation
manual.
4.2. Installing the controller
[Fig. 4.2.1] (P.3)
A Controller
When mounting the controller, use 4 supplied controller mounting screws, and
mount it vertically.
Warning:
Do not mount the horizontally laid controller.
2 If the unit is used on the highest story of a building and under conditions of
high temperature and humidity, it is necessary to use pipe size and insulating
material's thickness more than those given in the table above.
3 If there are customer's specifications, simply follow them.
Allowed
Standard evaporator
evaporator volume
path number*
950 ~ 1800 cm
3
3
3
1100 ~ 2000 cm
3
1200 ~ 2250 cm
3
3
3
1500 ~ 2850 cm
4 ~ 5
1900 ~ 3550 cm
3
4 ~ 5
2150 ~ 4050 cm
3
5 ~ 6
3
3000 ~ 5700 cm
6 ~ 10
3750 ~ 7100 cm
3
8 ~ 10
B Screw (field supply)
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