22
P01432Q-rev.1
8.2 Electrical Wiring Capacity
8.2.1 Field Minimum Wire Sizes for Power Supply
•
This equipment can be installed with a GFCI, which is a recognized measure for added protection to
a properly grounded unit. Install appropriate sized breakers / fuses / overcurrent protection switches
and wiring in accordance to local, state and NEC codes and requirements. The equipment installer is
responsible for understanding and abiding by applicable codes and requirements. Failure to use a GFCI
can result in electrical shock or fire.
•
Do not operate the system until all the check points have been cleared.
(A) Verify that electrical resistance is more than one megaohm by measuring the resistance between
ground and the terminals of the various electrical components. If less than one megaohm, do not
activate the system until the electrical current drain is found and repaired.
(B) Check to ensure that the stop valves for the outdoor unit are fully opened, and then start the system.
(C) Check to see that the main power has been switched ON for longer than 12 hours prior activating
the system. Power to the crankcase heater needs this time interval to warm the compressor oil up to
operating temperature.
•
Do not touch any of the parts by hand at the discharge gas side, since the compressor chamber and the
pipes at the discharge side are heated higher than 194
o
F (90
o
C).
Heat Pump System
Heat Recovery System
8.2.2 Details of Electrical Wiring Connection
The electrical wiring capacity of the outdoor unit should be referred according to the "Installation and
Maintenance Manual" for the outdoor unit. Adjusting the DIP switches may be required depending on the
arrangement with the outdoor unit.
Select wiring capacity according to the table 8.1. Install a GFCI and main switch as shown in each of the
system diagrams below.
Outdoor
Unit
Indoor
Unit
Switchbox
Outdoor Unit
Power Supply
Indoor Unit
Power Supply
Indoor
Unit
Indoor
Unit
GFCI
Main
Switch
GFCI
Main
Switch
Refer to the “Installation and Maintenance Manual”
for the connected outdoor unit for details of wire,
GFCI and main switch for outdoor unit.
Outdoor Unit
Power Supply
Outdoor
Unit
Change-Over
Box
Indoor Unit
Power Supply
Indoor
Unit
Switchbox
Indoor
Unit
Indoor
Unit
GFCI
Main
Switch
GFCI
Main
Switch
Refer to the “Installation and Maintenance Manual”
for the connected outdoor unit for details of wire,
GFCI and main switch for outdoor unit.
