5
5.
Make sure the mounting plate is leveled and flush with
the wall.
6.
Secure the unit in position by lifting the unit over the
mounting plate. Make sure the hook on the mounting
plate aligns with the slot on the back of the unit. To ensure
proper fit, slide the unit sideways. If the unit is locked in
the correct position, it should not move.
Step 4 — Connect Piping
GENERAL
1.
For condensate and refrigerant piping, lift the unit from
bottom, making sure the unit is still attached to the
mounting plate at the top. See Fig. 5.
2.
Introduce temporary cushioning material to maintain the
space needed to connect the piping and to avoid damage
to unit and wall. See Fig. 5.
3.
When the piping connections are completed, remove the
cushioning material and make sure the unit is flush with
the wall.
CONDENSATE PIPING — The unit is supplied with a
3
/
4
-in. OD drain connection to connect copper or PVC drain
piping. When installing condensate piping, follow these recom-
mendations:
• Condensate drain should slope downward in the direc-
tion of condensate flow.
• DO NOT install any U bends or dump the condensate
line in a sump filled with water. See Fig. 6.
• When multiple units are connected to a common conden-
sate drain, ensure that the drain is large enough to accom-
modate the volume of condensate from all units. It is also
recommended to have an air vent in the condensate pip-
ing to prevent any air locks.
• Condensate piping must not be installed where it may be
exposed to freezing temperatures.
• Condensate piping can be routed in one of the four direc-
tions shown in Fig. 7.
REFRIGERANT PIPING
When connecting from an indoor unit to an outdoor unit,
follow these procedures:
• Check maximum height drop and length of refrigerant
piping between the indoor and outdoor unit. If the differ-
ence between them is more than 33 ft, consider mounting
the outdoor unit above indoor unit.
• Refrigerant piping connection between indoor and out-
door 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.
• The number of bends in the refrigeration piping must be
fewer than 15.
• The refrigerant piping should be dry and free of dust and
other impurities.
• The bending angle of the refrigerant pipe should not
exceed 90 degrees 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.
• Before insulating the suction and liquid refrigeration
pipes, perform pressure and leak tests. For details, see
the outdoor unit installation manual. Insulating both suc-
tion and liquid refrigerant pipes is recommended.
• 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 with local building codes
and with National Electric Code ANSI/NFPA 70, latest edi-
tions. Units must be electrically grounded in conformance with
the code. In Canada, wiring must comply with CSA C22.1,
Electrical Code.
CUSHIONING
MATERIAL
HOOK
A40-1707
Fig. 5 — Piping Connection
a40-1708
Fig. 6 — Condensate Piping, Poor Installation
CAUTION
When connecting from an indoor unit to an outdoor unit,
the isolation valve at the outdoor unit should be in closed
position throughout the refrigerant piping process. Failure
to follow this procedure may result in equipment damage.
WARNING
Electrical shock can cause personal injury and death. Dis-
connect power supply before making wiring connections.
There may be more than one disconnect switch. Tag all dis-
connect locations to alert others not to restore power until
work is completed.
RIGHT PIPING
RIGHT BACK PIPING
LEFT BACK PIPING
LEFT PIPING
A40-1709
Fig. 7 — Condensate Pipe Routes