Step 6 - Refrigerant Piping - Carrier 40MUAA Installation Instructions Manual

40MUAA: Installation Instructions
INDOOR DRAINPIPE INSTALLATION
1. Cover the drainpipe with insulation, as required, to prevent
condensation and leakage. These units operate with a positive
pressure at the drain connection and a drain trap is required. The trap
needs to be installed as close to the unit as possible. Ensure the top
of the trap is below the connection to the drain pan to allow complete
drainage of the pan.
Fig. 27 —Vertical Discharge
Fig. 28 — Vertical Discharge
NOTE: Horizontal runs must also have a drain trap installed ahead
of the horizontal run to eliminate air trapping.
NOTES: When using an extended drainpipe, tighten the indoor
connection with an additional protection tube to prevent it from
pulling loose.
Hand tighten the plug(s) for drain holes that are unused.
Incorrect installation could cause water to flow back into the unit and
flood.
2. Use a 1" core drill to drill a hole in the wall. Make sure the hole is
drilled at a slight downward angle, so that the outdoor end of the
hole is lower than the indoor end by about 0.5in (12mm). This will
ensure proper water drainage. Place the protective wall cuff in the
hole. This protects the edges of the hole and helps seal the hole once
the installation is complete.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
NOTE: When drilling the hole, make sure to avoid wires, plumbing,
and other sensitive components.
3. Pass the drain hose through the wall hole. Make sure the water
drains to a safe location where it will not cause water damage or a
slipping hazard.
NOTE: The drainpipe outlet should be at least 2in(5cm) above the
ground. If it touches the ground, the unit may become blocked and
malfunction. If you discharge the water directly into a sewer, make
sure that the drain has a U or S pipe to catch odors that might
otherwise come back into the house. Follow the local plumbing codes.

Step 6 - Refrigerant Piping

IMPORTANT:
Suction line must be insulated.
• The minimum refrigerant line length between the indoor and
outdoor units is 10 ft. (3 m).
A220800
• Table 4 lists the pipe sizes for the indoor unit. Refer to the outdoor
unit's installation instructions for the additional allowed piping
lengths and refrigerant information.
• Refer to the outdoor unit's installation manual for details
regarding the allowable pipe length and height difference.
Gas Pipe In
A220801
(Connection Size) (mm)
Liquid Pipe In
(Connection Size) (mm)
All field piping must be completed by a licensed technician and
must comply with the local and national regulations.
When the system is installed in a small room, measures must be
taken to prevent the refrigerant concentration in the room from
exceeding the safety limit in the event of refrigerant leakage. If the
refrigerant leaks and its concentration exceeds its proper limit,
hazards due to lack of oxygen may result.
When installing the refrigeration system, ensure that air, dust,
moisture or foreign substances do not enter the refrigerant circuit.
Contamination in the system may cause poor operating capacity,
high pressure in the refrigeration cycle, explosion or injury.
Ventilate the area immediately if there is refrigerant leakage
during the installation.
Leaked refrigerant gas is hazardous. Ensure there is no refrigerant
leakage after completing the installation work.
12
Wall
Outdoor Indoor
Fig. 29 —Drill hole
Table 4 — Piping Size
18K 24K 30K 36K
3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19)
3/8 (9.52) 3/8 (9.52) 3/8 (9.52) 3/8 (9.52) 3/8 (9.52) 3/8 (9.52)
WARNING
A220804
48K 60K
3/4 (19) 7/8 (22)