15
Securing the Outdoor Unit
Slab or Roof Mounting
Install the unit a minimum of 4 inches (102 mm) above the
roof or ground surface to avoid ice build-up around the
unit. Place the unit above a load bearing wall or area of
the roof that can adequately support the unit. Consult local
codes for rooftop applications.
CAUTION
Roof Damage!
This system contains both refrigerant and oil. Some
rubber roofing material may absorb oil. This will cause
the rubber to swell when it comes into contact with oil.
The rubber will then bubble and could cause leaks.
Protect the roof surface to avoid exposure to refrigerant
and oil during service and installation. Failure to follow
this notice could result in damage to roof surface.
Securing Outdoor Unit to Slab, Frame, or Rails
If the outdoor unit is installed on a field-provided slab or
frame, use lag bolts or equivalent to secure the outdoor
unit to the slab or frame.
Four Field-provided Anchor Bolts
Figure 19. Securing Outdoor Unit to Slab
Four Field-Provided
Anchor Bolts
Figure 20. Securing Outdoor Unit to Rails
Securing Outdoor Unit to Hanging Brackets
If the outdoor unit is installed on field-provided wall
mounting brackets, use lag bolts or equivalent to secure
the outdoor unit to the bracket. Minimum rear clearance
can be reduced to 6 inches (152 mm) when mounted
on brackets and with no obstructions on the other three
sides. Allow for condensate disposal when placing units
above one another.
Air Outlet
Air Inlet
6 in
152 mm
Figure 21. Securing Outdoor Unit to Brackets
Refrigerant Piping Connections
Field piping consists of two copper lines connecting the
outdoor unit to the indoor unit. “Table 2. Refrigerant Piping
and Indoor Unit Connection Sizes” lists the connection
sizes. The connections are made using the provided brass
flare nuts at the end of the refrigerant piping connections.
Both lines must be individually insulated.
1. The seal on the unit refrigerant piping connections
should remain in place until the last possible moment.
This will prevent dust or water from getting into the
refrigerant piping before it is connected.
2. CAREFULLY adjust refrigerant piping connections to
suit the application.
3.
Slowly loosen one of the flare nuts to release the
factory nitrogen charge from the indoor units only.
4.
Remove the flare nuts from the connections on the
unit and discard the seal from each of the piping
connections.
5.
Slide the flare nuts onto the ends of the field-provided
refrigerant piping before using a suitable flaring tool to
flare the end of the copper pipe.
6. Apply recommended HFC-410A refrigerant lubricant
to the outside of the flared refrigerant lines.
IMPORTANT
The compressor in this unit contains PVE
oil (Polyvinylether). PVE oil is formulated for
hydrofluorocarbon (HFC) refrigerants, such as HFC-
410A, which this system contains. While it may have
some miscibility properties with mineral-based oil and
POE oil (Polyolester), it is not recommended to mix PVE
oil with any other type of refrigerant oil.
Summary of Contents for MWMA009S4-*L
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