Johnson Controls YVAHP072B31S, Service Manual

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Cord Clamp
Terminal Board
for Power Source Terminal Board
for Communication
Ground Wire
CN
3
CN
4
CN
2
CN
1
1 2 3 4
PCB1
PCN
1
TB2
TB1
L2
N
L1
Communication Cable
to Indoor Unit Communication Cable
to Outdoor Unit
PVC Tube “VW-1 600V” ((12) Accessory)
Fix the PVC Tube by Cord Clamp ((11) Accessory)
Power Source Wiring
1~
208/230V 60Hz
φ
7/8 inch (22.2mm)
Conduit Hole
Connecting Hole for
Communication Cable Connecting Hole for
Power Source Wiring
1-106
Service Manual
INSTALLATION
6.1 General Check
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Circuit Interrupter), wires, conduit connectors and wire terminals) have been properly selected
according to the electrical data indicated in Table 6.1. Make sure that the components comply with
National Electrical Code (NEC).
(2) 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
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Controls guidelines. Plenum and riser ratings for communication cables must be considered per
application and local code requirements.
(3) Use shielded communication cable for communication cabling between the indoor and the outdoor unit
(Max. 3,281 ft (1,000m)), and connect the shielded part to the ground screw in the electrical box.
(4) Make sure that the power supply voltage is within ±10% of the rated voltage.
(5) Check the capacity of the electrical wires. If the power source capacity is too low, the system cannot
be started due to the voltage drop.
(6) Make sure that the ground wire is connected.
Fig. 6.1 Electrical Wiring Connection
6.2 Electrical Wiring
The electrical wiring connection for the Change-Over Box is shown in Fig. 6.1.
(1) Turn OFF the main power switch and take off the electrical box cover of Change-Over Box.
(2) Connect the power source wiring to L1 and L2 on the terminal board TB1, and ground wire to the
terminals in the electrical box.
(3) Connect the communication cable to “1”, “2”, “3” and “4” on the terminal board TB2 mounted on PCB1.
(4) Tightly clamp the wires using the cord clamp inside the electrical box.
(5) Fix the electrical box cover after wiring work.
NOTE:
The accessory numbers are listed in Table 4.1.