12
I&O manual
F ield wiring
The units are internally wired at the factory according to
generally accepted electrical technology.
Required field wiring
Main power wiring to the unit control wiring between the control
center and the unit, and earth wiring are required in the field.
Required components
The following components are required: main power fuses,
conduit coupling, and field supplied room thermostat.
These data are based on the following conditions.
Evaporator Air Input Temperature 85 F DB, 66 F WB.
Condenser Air Input Temperature 115 F DB.
The strating current is indicated for each compressor motor.
The maximum currents of the compressor can be estimated
as follows.
Max. IPT*: Compressor power input from the performance table at
the expected maximum condition
STC,IPT,RNC: Compressor data from the above table
The data in the compressor motor column shall indicate the respec-
tive values of the refrigeration cycle.
NOTE
Max. current
One compressor unit Two compressors unit
RNC×Max. IPT*/IPT RNC×Max. IPT*/IPT
STC+RNC×0.5
×Max. IPT*/IPT
STC
Max. instantaneous
current
Tab.6-10
6.4 Wiring provision
Wiring length between room thermostat and unit(one way)
10m
0.5
0.5
0.75
0.75
1.0
15m
20m
30m
40m
Minimum wire
size(mm
2
)
Tab.6-11
Wire size between room thermostat and unit
The wire size between the room thermostat and the unit should
be determined according to the following table, because the 24V
power source is applied to the control circuit.
Wire and fuse size selection for main power source
Wire and fuse sizes should be selected in accordance with
national and standard, taking the designed maximum current
shall be the total of the compressor maximum current,
condenser fan motor current and evaporator fan motor
current(refer to “electrical data”).
6.3 Installation Example
Main power switch
4 wires for Power supplies
To the 4 wires from wire controller
(for C/O units) or 5 wires from wire controller
(for E/C/O units and H/P units)
Earth
unit
Fig.6-1
Содержание RC060RTRGA
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