Installation Manual

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
12
WIRING
Size all wires per the NEC (National Electrical Code) or CEC (Canadian
El
ectrical Code) and local codes. Use the electrical data from the outdoor
unit (MCA - minimum circuit amps and MOCP - maximum over current
protection), to correctly size the wires and the disconnect fuse or breakers
respectively.
SIZES 9-24 RECOMMENDED CONNECTION METHOD
FOR POWER AND COMMUNICATION WIRING
Power and Communication Wiring: The main power is supplied to the
outdoor unit. The field supplied 14/3 power/communication wiring, from the
outdoor unit to the indoor unit, consists of four (4) wires and provides the
power for the indoor unit. Two wires are high voltage AC power, one is
communication wiring and the other is a ground wire.
To minimize communication interference: If installed in a high
Electromagnetic field (EMF) area and communication issues arise, a 14/2
stranded shielded cable can be used to replace L2 and (3) between the
outdoor and indoor units - landing the shield onto the ground in the
outdoor unit only.
NOTE: The main power is supplied to the outdoor unit. When
disconnecting the power of the outdoor unit, the indoor unit would lose
power. A disconnect switch is not required on the Indoor unit side on the
wiring between the outdoor and indoor unit. A 3 pole disconnect may be
used for extra protection between the indoor and outdoor unit (refer to
local codes).
Step 7 - Electrical And Gas Leak Checks
Before Test Run
Only perform a test run after you have completed the following.
• Electrical Safety Checks – Confirm that the unit’s electrical system is
safe and operating properly
• Gas Leak Checks – Check all flare nut connections and confirm that
the system is not leaking
• Confirm that gas and liquid (high and low pressure) valves are fully
open
Electrical Safety Checks
After the installation, confirm that all electrical wiring is installed in
accordance with local and national regulations, and according to the
Installation Manual.
Before Test Run
Check Grounding Work
Measure the grounding resistance by visual detection and with grounding
resistance tester. Grounding resistance must be less than 0.1 .
NOTE: This may not be required for some locations in North America.
During Test Run
Check for Electrical Leakage
During the Test Run, use an electroprobe and multimeter to perform a
comprehensive electrical leakage test. If electrical leakage is detected,
turn off the unit immediately and call a licensed electrician to find
and resolve the cause of the leakage.
NOTE: This may not be required for some locations in North America.
Gas Leak Checks
There are two different methods to check for gas leaks.
Soap and Water Method
Using a soft brush, apply soapy water or liquid detergent to all pipe
connection points on the indoor unit and outdoor unit. The presence of
bubbles indicates a leak.
Leak Detector Method
If using a leak detector, refer to the device’s operation manual for proper
usage instructions.
After Performing Gas Leak Checks
After confirming that the all pipe connection points DO NOT leak,
replace the valve cover on the outside unit.
Fig. 25 — Gas Leak Checks
EQUIPMENT DAMAGE HAZARD
Be sure to comply with local codes while running wire from the
indoor unit to the outdoor unit.
Every wire must be connected firmly. Loose wiring may cause the
terminal to overheat or result in a unit malfunction. A fire hazard
may also exist. Ensure all wiring is tightly connected.
No wire should touch the refrigerant tubing, compressor or any
moving parts.
Disconnecting means must be provided and located within sight
and readily accessible from the system. Route the connecting
cable with conduit through the hole in the conduit panel.
CAUTION
A: Low pressure stop valve
B: High pressure stop valve
C & D: Indoor unit flare nuts
Check-point of indoor unit
Check-point of outdoor unit
A
B
C
D