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11
Fig. 23 —Electrical Wiring for Panel Assembly
(015-024)
Step 4 — Connect Piping
CONDENSATE PIPING — The unit is supplied with a
1
-1
/
4
-inch OD drain connection to connect copper or plastic
drain piping. Follow these recommendations when installing
condensate piping:
• Maximum pump lift is 27
-1
/
2
inches.
• The highest point in the condensate piping should be as
close to the unit as possible. See Fig. 24 and 25.
Fig. 24 —Connecting Water Discharge Pipes
• Condensate piping should slope downward in the
direction of condensate flow with a minimum gradient of
1 inch per 100 inches.
Fig. 25 —Condensate Piping (Downward Slope)
• When multiple units are connected to a common
condensate drain, ensure that the drain is large enough to
accommodate the volume of condensate from all units. It
is also recommended to have an air vent in the
condensate piping to prevent air lock.
• Condensate piping must not be installed where it may be
exposed to freezing temperatures.
REFRIGERANT PIPING
Follow these procedures when connecting from an indoor unit
to an outdoor unit:
• Check the maximum height drop and length of
refrigerant piping between the indoor and outdoor units.
To ensure the drop and length are acceptable, refer to the
refrigerant piping allowable limits in the outdoor unit
installation manual.
• The number of bends in the refrigeration piping must be
less than 15.
• The refrigerant piping connection between indoor and
outdoor units should be performed once the units are
secured at their respective installation locations.
• The refrigeration piping starts at the indoor unit and ends
at the outdoor unit or Multiport Distribution Controller
(MDC) for Heat Recovery systems.
• The refrigerant piping should be dry and free of dust and
other impurities.
• The bending angle of the refrigerant pipe should not
exceed 90º and the bending radius should be as large as
possible to prevent any breakage in piping.
• Use proper cutting and flaring tools to avoid leakage.
• Use a torque wrench for flare nuts. Refer to Table 3 for
flare nut torque recommendations.
Table 3 — Flare Nut Torque Recommendations
• Before insulating the suction and liquid refrigeration
pipes, perform pressure and leak tests. For details, see
the outdoor unit installation manual. Insulating both
suction and liquid refrigerant pipes is mandatory.
• Vacuuming and charging of the system should be carried
out as described in the outdoor unit installation manual.
Step 5 — Complete Electrical Connections —
Installation of wiring must conform to local building codes. In
absence of local codes, wiring must conform to the National
Electric Code ANSI/NFPA (American National Standards
Institute/ National Fire Protection Association) 70, current
editions. Units must be electrically grounded in conformance
with the code. In Canada, wiring must comply with CSA
(Canadian Standards Association) C22.1, Electrical Code.
2 wires on the panel pass into the electric control
box through this opening
10-core cable plug on the panel connects to
CN15 of the main control board
5-core cable plug on the panel connects to CN21 of the main control board
Room temp. sensor(T1) wire cable plug connects to the CN4
of the main control panel
Maximum condensate lift is 27-1/2
inches.
Water discharge pipes from multiple units are connected to the
main water discharge pipe to be discharged through the sewage pipe.
Slope greater than 1/100
CAUTION
When connecting from an indoor unit to an outdoor unit,
the isolation valve at outdoor unit should be in the closed
position throughout the refrigerant piping process. Failure
to follow this procedure may result in equipment damage.
OUTSIDE DIAMETER (in.)
RECOMMENDED TORQUE (ft-lb)
1/4
15
3/8
26
1/2
41
5/8
48
WARNING
Electrical shock can cause personal injury or death.
Disconnect the power supply before making wiring
connections. There may be more than one disconnect
switch. Tag all disconnect locations to alert others not to
restore power until work is completed.