General Check; Electrical Wiring Capacity; Field Minimum Wire Sizes For Power Supply; Details Of Electrical Wiring Connection - York TIWM006B22S Installation And Maintenance Manual

8.1

General Check

(1) Make sure that the field-selected electrical components: (main power switches, circuit breakers, wires,
conduit connectors, and wire terminals) are properly labeled in accordance with electrical data as
specified in the "Engineering Manual" for the indoor units. Make sure that the components comply with
the National Electrical Code (NEC).
(2) Check to ensure that the power supply voltage is within ±10% of the rated voltage.
(3) Check the capacity of the electrical wires.
If the power supply capacity is too low, the system cannot be started due to a voltage drop.
(4) Verify that the ground wiring is securely connected.
8.2

Electrical Wiring Capacity

8.2.1 Field Minimum Wire Sizes for Power Supply

• This equipment can be installed with a Ground Fault Circuit Interruptor (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 could result in electric shock or fire.
• Do not operate the system until all check points are cleared.
(A) Check to ensure that the electrical resistance is more than one megaohm, by measuring the
resistance between ground and the terminal of the electrical parts. If it is less than one megaohm,
do not operate the system until the source of the electrical current drain is found and repaired.
(B) Check to ensure that the stop valves of the outdoor unit are fully opened, and then start the system.
(C) Check to ensure that the switch on the main power has been ON for more than 12 hours, to warm
up the compressor oil by the crankcase heater.
• 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 to higher than 194

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 (Ground Fault Circuit Interrupter) and
main switch as shown in each of the system diagrams below.
Heat Pump System
Outdoor
Unit
Outdoor Unit
Power Supply
GFCI Main
Switch
Indoor Unit
Power Supply
GFCI Main Switchbox
Switch
Refer to the "Installation and Maintenance Manual"
for the connected outdoor unit for details of wire,
GFCI and main switch for outdoor unit.
P5417090
Indoor Indoor Indoor
Unit Unit Unit
o o
F (90 C).
Heat Recovery System
Outdoor Unit
Power Supply
GFCI Main
Switch
Indoor Unit
Power Supply
Switchbox
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
Change-Over
Box
Indoor Indoor
Unit Unit
Indoor
Unit
25