9
Fig. 13 —Using a Main Drain to Serve Multiple Indoor Units with Internal Condensate Pumps
• Condensate piping should slope downward in the
direction of condensate flow with a minimum gradient of
1 inch per 100 inches.
• 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 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.
• 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 4 for
flare nut torque recommendations.
Table 4 — 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.
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
the 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. See Table 5 for electrical data.
2“~4”
2“~4”
2“~4”
Max. 3-3/4 ft.
7-7/8”
7-7/8”
7-7/8”
Connection assembly of water outlet Main drainage pipe
Gradient: 1/50~1/100
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 and death.
Disconnect 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 221ºF.
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.
Summary of Contents for 40VMF
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