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

40MBAB: Installation Instructions
Incorrect installation may cause water to flow back into the unit and
flood.
3. 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) (see Figure
32. 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.
Outdoor
Fig. 32 —Drill hole
NOTE: When drilling the hole, make sure to avoid wires, plumbing,
and other sensitive components.
4. Pass the drain hose through the wall hole. Ensure 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).
• Table 6 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.
Table 6 — Piping Size
18K
Gas Pipe In
1/2 (13)
(Connection Size) (mm)
Liquid Pipe In
1/4 (6)
(Connection Size) (mm)
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Wall
Indoor
24K 30K 36K 48K
5/8 (16) 5/8 (16) 5/8 (16) 5/8 (16)
3/8 (9.52) 3/8 (9.52) 3/8 (9.52) 3/8 (9.52) 3/8 (9.52)
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.
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DO NOT install the connecting pipe until both the indoor and
outdoor units have been installed.
Insulate suction line to prevent condensation.
Use the following steps to connect the refrigerant piping:
1. Run the interconnecting piping from the outdoor unit to the indoor
unit.
2. Connect the refrigerant piping and drain line outside the indoor unit.
Complete the pipe insulation at the flare connection then fasten the
piping and wiring to the wall as required. Completely seal the hole in
the wall.
3. Cut tubing to correct length.
When preparing refrigerant pipes, take extra care to cut and flare
them properly. This ensures efficient operation and minimizes the
need for future maintenance.
a. Measure the distance between the indoor and outdoor units.
b. Using a pipe cutter, cut the pipe a little longer than the measured
distance.
c. Ensure the pipe is cut at a perfect 90° angle.
90°
60K
7/8 (22)
DO NOT DEFORM PIPE WHILE CUTTING
Be extra careful not to damage, dent, or deform the pipe while
cutting. This drastically reduces the heating efficiency of the unit.
12
WARNING
CAUTION
Oblique Rough Warped
Fig. 33 —Pipe Cutting
CAUTION
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