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
difference between them is more than 33 feet, consider
mounting the outdoor unit above indoor unit.
• 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.
• There should be less than 15 bends in the refrigeration
piping.
• The refrigerant piping should be dry and free of dust and
other impurities.
• The bending angle of the refrigerant pipe should not
exceed 90
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 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 to local building codes and
with National Electric Code ANSI/NFPA 70, latest editions.
Units must be electrically grounded in conformance with the
code. In Canada, wiring must comply with CSA C22.1,
Electrical Code.
This equipment in its standard form is designed for an
electrical supply of 208/230-1-60. Any damage to or failure of
units caused by incorrect wiring or voltage is not covered by
warranty.
Electric wiring must be sized to carry the full load amp draw of
the motor, starter, and any other controls that are used with the
unit. Refer to Table 4 for electrical data.
Table 4 — 40VMW Electrical Data
After the pipe work is complete, the electrical supply can be
connected by routing the cable through the appropriate casing
holes or knockouts and connecting the supply and ground
cables to the unit’s power terminal.
Be sure the power wiring and control wiring do not cross, as
this might cause disturbance on the controls side. See Fig. 10
for wiring diagram.
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.
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 and 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.
WARNING
All units must be wired strictly in accordance with the
wiring diagram furnished with the unit. Any wiring
different from the wiring diagram could result in personal
injury and property damage.
CAUTION
Any original factory wiring that requires replacement must
be replaced with wiring material having a temperature
rating of at least 105
C.
Ensure supply voltage to the unit, as indicated on the serial
plate, is not more than 10% over the rated voltage or 10%
under the rated voltage.
Failure to follow these recommendations may result in
equipment damage.
UNIT
POWER SUPPLY
MCA
MOPD
40VMW005
0.29
15
40VMW007
0.45
15
40VMW009
0.45
15
40VMW012
0.45
15
40VMW015
0.45
15
40VMW018
0.45
15
40VMW024
0.86
15
40VMW030
0.86
15
LEGEND
MCA — Minimum Circuit
Amps
MOPD — Maximum Overcurrent
Protective Device
