GVZC20 Installation Manual
9
NOTICE
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The heat pump unit rating plate lists pertinent electrical
data necessary for proper electrical service and
overcurrent protection. Wires should be sized to limit
voltage drop to 2% (max.) from the main breaker or fuse
panel to the condensing unit. Consult the NEC, CEC, and
all local codes to determine the correct wire gauge and
length.
Local codes often require a disconnect switch located near
the unit; do not install the switch on the unit.
The inverter control system software provides sucient
time delay to protect from overcurrent conditions and
permit the compressor and fan motors to adjust their
rotational speed.
Route power supply and ground wires through the high
voltage port and terminate in accordance with the wiring
diagram provided inside the control panel cover.
• Make sure to apply the rated voltage of 208/230V for
the unit.
• Use conduit for power supply cables.
• A power circuit (see the production specication
sheet or the unit serial plate) must be provided for
connection of the unit. This circuit must be protected
with the required safety devices.
• When using residual current operated circuit breakers,
be sure to use a high-speed type (0.1 seconds or
less) 200 mA rated residual operating current.
• Use copper conductors only.
• Use insulated wire for the power cord.
• Select the power supply cable type and size
in accordance with relevant local and national
regulations.
• Outside the unit, make sure to keep the wirings 5 inch
away. Otherwise, the outdoor unit may be aected by
electrical noise (external noise), and malfunction or
fail.
• Make sure the wirings will not be pinched by the front
panel, and close the panel rmly.
• Route the conduit along the unit and so on to prevent
wirings from being stepped on.
The unit is designed to work as part of a fully
communicating HVAC system, utilizing either:
• ComfortBridge compatible indoor unit with any 24V
single stage thermostat
• CTK04AE or newer thermostat (If paired with
ComfortNet compatible indoor unit)
Route control wires through the low voltage port and
terminate in accordance with the wiring diagram provided
inside the control panel cover.
ComfortBridge
™
control system low voltage wiring consists
of two wires between the indoor unit and outdoor unit. The
required wires are data lines 1 and 2.
The thermostat needs 4 wires between the indoor unit and
thermostat or 5 wires if the thermostat requires a Common
wire.
Regarding the wiring of the indoor unit to the thermostat,
also refer to ComfortBridge compatible indoor unit’s Install
manual.
If installing with a CTK04 thermostat, please see the
addendum for further instructions.