Carrier X-POWER Series Service Manual page 129

Carrier service manual
The current value of combination unit is the total value of each basic model (refer to Units Combination Table in Part1)
For example: 46HP=16HP+16HP+14HP
Power current: MCA=54.6+54.6+54.6=163.8
TOCA=54.4+54.4+54.4=163.2
MFA=60+60+60=180
Compressor: RLA=(35.5+21.1)+ (35.5+21.1)+ (35.5+21.1)=169.8
OFM: FLA=3.4 2+3.4 2+3.4
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Remark:
MCA: Min. Current Amps. (A)
TOCA: Total Over-current Amps. (A)
MFA: Max. Fuse Amps. (A)
MSC: Max. Starting Amps. (A)
RLA: Rated Locked Amps. (A)
OFM: Outdoor Fan Motor.
FLA: Full Load Amps. (A)
KW: Rated Motor Output (kW)
Notes:
1. RLA is based on the following conditions, Indoor temp. 27℃ DB/19℃ WB,Outdoor temp. 35℃ DB
2. TOCA means the total value of each OC set.
3. MSC means the Max. current during the starting of compressor.
4. Voltage range. Units are suitable for use on electrical systems where voltage supplied to unit terminals is not below or
above listed range limits.
5. Maximum allowable voltage variation between phases is 2%.
6. Selection wire size based on the larger value of MCA or TOCA.
7. MFA is used to select the circuit breaker and the ground fault circuit interrupter (earth circuit breaker).
7.3 Signal wiring installation
The signal line should be shielded wire. Using other wiring shall create signal interference, thus leading
to error operation.
The shielded nets at the two sides of shielded wires are either grounded to the earth, or connected with
each other and jointed to the sheet metal along to the earth.
Signal wire could not be bound together with refrigerant pipeline and power wire. When power wire and
signal wire is distributed in parallel form, keep gap between them above 300mm so as to preventing
signal interference.
Signal wire could not form closed loop.
Signal wire has polarity, so be careful when connecting.
The shield net should be grounded at the wiring terminal of outdoor unit. The inlet and outlet wire net of
indoor signal wire should be connected directly and could not be grounded, and form open circuit at the
shield net of final indoor unit.
7.3.1 Signal wire between outdoor unit and indoor unit
Installation
2=20.4
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