Installation and Maintenance Manual

28 VRF-SVN33A-EN
Electrical Wiring
• If you have grounded the unit to a grounding terminal or electrical panel, ensure that the
resistance meets the requirements.
Communications Wiring
• Refer to BAS-SVX51 for communications wiring specifications and best practices.
•Refer to Table 12, p. 25 for cable conduit specifications.
1. Connect the communications cable wires to the terminals, as shown in Figure 19.
Notes:
• Ensure that more than 1 in. (20 mm) of the outer sheath of the power and communication
cable conduit are inside the electrical component box.
• To reduce interference, ensure that power and communication cables run in parallel with
a minimum space of 2 in. (50 mm) between the cables or, if crossing is necessary, cross
at 90 degrees.
• The communication cable between mini outdoor units and between indoor and outdoor
units has no polarity.
Figure 19. Communications board and wiring terminals
2. Provide strain relief for the communications cable.
3. Pull the communications cable through the designated knock-out at the bottom right of the mini
outdoor unit (refer to Figure 15, p. 23/Figure 16, p. 24).
Table 13. Grounding resistance requirements
Power condition at
installation site
High or average humidity Low humidity
Voltage to ground is ≤ 150 V
• Ensure that the grounding resistance is <100 .
• If a circuit breaker is installed that disconnects the
circuit within 0.5 seconds, the allowable grounding
resistance is 30–500 .
• Ideally, grounding resistance should be <100 and
should not exceed 250 .
Voltage to ground is > 150 V
• Ensure that the grounding resistance is <100 .
• If a circuit breaker is installed that disconnects the
circuit within 0.5 seconds, the allowable grounding
resistance is 30–500 .
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote disconnects before servicing. Follow proper
lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to
disconnect power before servicing could result in death or serious injury.
F1, F2: Communication between indoor and outdoor units