Johnson Controls YVAHP072B31S, Service Manual

Page: 123 / 1796

Service Manual
1-107
INSTALLATION
6.3 Electrical Wiring Connection
(1) Perform the electrical wiring work for the Change-Over Boxes. Select the wire size according to the
table below.
(2) Pay attention to the marks on the terminal board when connecting wires for Change-Over Box and I.U./
O.U. Refer to “Example of Electrical Wiring” for the wiring connection on the next page.
NOTES:
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2) Use a shielded communication cable for the communication and take shielding ground on the ground terminal.
Communication cabling shall be a minimum of 18-Gauge, 2-Conductor, Stranded Copper. Shielded cable must
be considered for applications and routing in areas of high EMI and other sources of potentially excessive
electrical noise to reduce the potential for communication errors. When shielded cabling is applied, proper
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ratings for communication cables must be considered per application and local code requirements.
3) Select the Ground Fault Circuit Interrupter Breaker whose activation speed is 0.1 sec. or less.
4) Total operating current must be less than 12A.
Model
Power
Supply
Minimum Wire Thickness (AWG [mm
2
]) Ground Fault Circuit
Interrupter Breaker
Main Switch
MCA
Minimum
Circuit
Ampacity
Power Source
Wiring Size
Ground
Wiring
Size
Commu-
nication
Cable
Size
Nominal
Current
Nominal
Sensitive
Current
Nominal
Current
Fuse
Main Branch (A) (mA) (A) (A) (A)
COBS048B21S
COBS096B21S
1~,
208/230V
60Hz
14 [2.1] 18 [0.82] 18 [0.82] 18 [0.82] 15 30 15 15 0.1
Table 6.1 Electrical Data and Recommended Wiring, Breaker Size