Outdoor Unit Installation - Carrier 38GJQ Series 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 CAUTION
!
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Excessive torque can break the flare nut depending on
installation conditions.
Piping Connections to 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. Ensure there is enough
piping to cover the required length between the outdoor and
indoor unit. Only use piping suitable for high side pressure for
both the high side and low side connections.
Piping Guide:
S Do not open the service valves or remove the protective caps
from the tubing ends until all the connections are made.
S Bend the tubing with bending tools to avoid kinks and flat
spots.
S Keep the tubing free of dirt, sand, moisture, and other
contaminants to avoid damaging the refrigerant system.
S Avoid sags in the suction line to prevent the formation of oil
traps. Insulate each tube with a 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 the
installation quality.
1 The unit is equipped with multiple pairs of service valves
(except sizes 48 and 56). Each pair is clearly marked (color
and letter) to identify the indoor unit circuits. In the outdoor
unit wiring area, each indoor unit interconnecting terminal
block is marked (letter) the same as the corresponding pair of
service valves. The indoor units must be piped and wired in
matched sets (A to A; B to B, etc.).
2 It is not required to use all of the available fan coil
connections if the application does not require them at the
current time. The system can be expanded at any time.
3 Conversion joints are supplied with the outdoor unit. They
are required for certain fan coil combinations. These joints
are to be connected to the outdoor unit as needed to match
the line set size.
4 Cut tubing with a tubing cutter.
5 Install the correct size flare nut into the tubing and make the
flare connection.
6 Apply a small amount of refrigerant oil on the flare
connection on the tubing.
7 Properly align the tubing with the service valve (conversion
joint).
8 Tighten the flare nut and finish the installation using two
wrenches (see Fig. 77).
Fig. 77 – Tighten Flare Nut
Install all Power and Interconnecting Wiring to
the Outdoor Unit*
Fig. 78 – High Wind Installation
Outdoor Unit Wiring Connections
1 Mount the outdoor power disconnect.
2 Run the power wiring from the main box to disconnect per
the NEC and local codes.
3 Remove the field wiring cover (if available) from the unit
by loosening the screws.
4 Remove the knockouts.
5 Connect the conduit to the conduit panel (see Fig. 82).
6 Properly connect both the power supply and the control
lines to the terminal block per the connection diagram.
7 Ground the unit in accordance with the NEC and local
electrical codes.
8 Use the lock nuts to secure the conduit.
9 Reinstall the field wiring cover.
!
*Branch Boxes required on sizes 48 and 56.
A separate power connection is required for the Outdoor
unit and the Branch Boxes.
Refer to the Branch Box installation instructions.
!
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
S Be sure to comply with local codes while running wire
from the indoor unit to the 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. Therefore, 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.
A07354
38
Strong
wind
NOTE CAUTION
CAUTION CAUTION
A07350