Wiring Connections - Lennox VRF VMDB Series Installation Instruction

Wiring Connections

WARNING
Isolate the power supply before accessing unit electrical
terminals.
Install unit so that unit disconnect is accessible.
Follow all local and national codes, as well as this
installation instruction, during installation. Do NOT
overload electrical circuit, as this may lead to failure and
possible fire.
Use specified wiring and cable to make electrical
connections. Clamp cables securely and make sure that
connections are tight to avoid strain on wiring. Insecure
wiring connections may result in equipment failure and
risk of fire.
Wiring must be installed so that all cover plates can be
securely closed.
In the U.S.A., wiring must conform with current local
codes and the current National Electric Code (NEC). In
Canada, wiring must conform with current local codes and
the current Canadian Electrical Code (CEC).
Refer to unit nameplate for minimum circuit ampacity and
maximum overcurrent protection size.
NOTE - Two-conductor stranded shielded cable
must be used for the communication wiring. This is
necessary to ensure proper system communication
and operation.
• A circuit breaker capable of shutting down the power
supply to the entire system must be installed.
• A single switch can be used to supply power to units
on the same system. However, branch switches and
circuit breakers must be selected carefully.
• Fit the power supply wiring of each unit with a switch
and fuse as shown in the wiring diagram.
• Install a wiring interrupter or ground-fault circuit
interrupter for the power wiring.
• Make sure the ground resistance is no greater than
100Ω. This value can be as high as 500Ω when using
a grounding fault circuit interrupter since the protective
ground resistance can be applied.
This unit must be properly grounded and protected by a
circuit breaker. The ground wire for the unit must not be
connected to a gas or water pipe, a lightning conductor
or a telephone ground wire.
Do not connect power wires to the outdoor unit until
all other wiring and piping connections have been
completed.
Install all wiring at least 3 feet away from televisions,
radios or other electronic devices in order to avoid the
possibility of interference with the unit operation.
Do not install the unit near a lighting appliance that
includes a ballast. The ballast may affect remote control
operation.
A disconnection device having an air gap contact
separation in all
incorporated in the fixed wiring according to the National
Wiring Regulation.
1. Remove the screws that secure the control box cover.
Remove the cover and place it to the side where it will
not be damaged.
2. Locate the terminal strip in the control box. Connect
the power wiring (sized per NEC/CEC and local
codes) and communications cable (two-conductor,
shielded cable) per Figures 21. 22 and 23. Refer to
unit nameplate for rated voltage.
3. If the indoor unit is the final unit in a group that is wired
in series, install the provided resistor across terminals
P and Q.
4. The infra-red receiver / display panel can be
repositioned, if necessary. Use optional extension
cable kit V0CTRL93P-1 (cat # 14R84).
14
CAUTION
CAUTION
active conductors should be