Outdoor Unit Installation; Install All Power And Interconnecting Wiring To Outdoor Units - Carrier 40MBC/38MAQ Installation Instructions Manual

OUTDOOR UNIT INSTALLATION

1. Use a rigid base to support the unit in a level position.
2. Locate the outdoor unit and connect the piping and wiring.
CAUTION
!
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage
or improper operation.
In regions with snowfall and cold temperatures, avoid installing
the outdoor unit in areas where it can be covered by snow. If the
outdoor unit is installed in areas where heavy snow is expected, a
field supplied ice or snow stand and/or field supplied- -installed
wind baffle should be installed to protect the unit from snow
accumulation and/or blocked air intake. Blocking the air intake
may result in reduced airflow, significantly reduced performance
and damage to the equipment.
Strong
wind
Fig. 33 --- High Wind Installation
MAKE REFRIGERANT PIPING CONNECTIONS
(OUTDOOR UNIT)
IMPORTANT: Use refrigeration grade tubing ONLY. No other
type of tubing may be used. Use of other types of tubing will
void the manufacturer's warranty.
Do not open service valves or remove protective caps from tubing
ends until all the connections are made. Bend the tubing with bending
tools to avoid kinks and flat spots. Keep the tubing free of dirt, sand,
moisture, and other contaminants to avoid damaging the refrigerant
system.
Avoid sags in the suction line to prevent the formation of oil traps.
Insulate each tube with minimum 3/8- -in. (10 mm) wall thermal pipe
insulation. Inserting the tubing into the insulation before making the
connections will save time and improve installation quality.
1. Remove the service valve cover if provided with the unit.
2. Cut the tubing with a tubing cutter. Remove the service
connection if provided with unit.
3. Install the correct size flare nut onto the tubing and make
the flare connection.
4. Apply a small amount of refrigerant oil to the flare
connection on the tubing.
5. Properly align the tubing with the service valve.
6. Tighten the flare nut to proper torque value (see Table 5) and
finish the installation using backup wrenches (see Fig. 34).
Fig. 34 --- Tighten Flare Nut
Pipe Diameter
Inch (mm)
Ø1/4" (6.35)
Ø3/8" (9.52)
Ø1/2" (12.7)
Ø5/8" (15.88)
!
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Excessive torque can break flare nut depending on
installation conditions.
INSTALL ALL POWER AND INTERCONNECTING
WIRING TO OUTDOOR UNITS
1. Mount the outdoor power disconnect.
2. Run the power wiring from the main box to disconnect per
NEC and local codes.
3. Remove the field wiring cover from the unit by loosening
the screws.
4. Remove the caps on the conduit panel.
5. Connect the conduit to the conduit panel (see Fig.35).
6. Properly connect both the power supply and the control
lines to the terminal block per the connection diagram for
the appropriate unit capacity and voltage.
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7. Ground the unit in accordance with NEC and local
electrical codes.
8. Use lock nuts to secure the conduit.
9. Reinstall the field wiring cover.
!
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
S Comply with local codes while running wire from indoor
unit to outdoor unit.
S Every wire must be connected firmly. Loose wiring may
cause the terminal to overheat or result in unit
malfunction. A fire hazard may also exist. Be sure all
wiring is tightly connected.
S No wire should be allowed to touch the refrigerant
tubing, compressor or any moving parts.
S Disconnecting means must be provided and shall be
located within sight and readily accessible from the air
conditioner.
S Connecting cable with conduit shall be routed through
hole in the conduit panel.
Outdoor unit
Terminal Block
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15
Table 5— Tightening Torque
Tightening Torque
Ft- -lb
10 to 13
23 to 31
37 to 46
60 to 60
CAUTION
CAUTION
Conduit panel
G
Conduit
Fig. 35 --- Field Wiring
N- -m
13.6 to 17.6
32.5 to 42.0
50.1 to 62.3
67.7 to 81.3
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