Installation guide

to absorb vibration. Refer to separate indoor unit installation
instructions for additional information.
Expansion Device
A hard shutoff, thermostatic expansion valve (TXV) is required at
the indoor section of the system for proper operation of these
products. If the indoor section of the system is not equipped with a
hard shutoff TXV, refer to Spec Sheet for the correct TXV kit to be
installed. Follow the instructions in the kit for proper installation.
Filter Drier
The filter drier nmst be replaced whenever the refrigeration system
is exposed to the atmosphere.
Refer to Fig. 3 and install filter drier as follows:
1. Braze 5-in. (127 ram) liquid tube to the indoor coil.
2. Wrap filter drier with damp cloth.
3. Braze filter drier to above 5-in. (127 ram) liquid tube. Flow
arrow must point towards indoor coil.
4. Connect and braze liquid refrigerant tube to the filter drier.
Provide Safety Relief
A fusible plug is located in unit suction line; do not cap this plug.
If local code requires additional safety devices, install as directed.
Step 4 --Make Electrical connections
ELECTRICALSHOCK HAZARD
Failure to follow this warning could result in personal iniury
or death.
The unit cabinet must have an uninterrupted or unbroken
ground to nfininfize personal iniury if an electrical fault
should occur. The ground may consist of electrical wire or
metal conduit when installed in accordance with existing
electrical codes.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage
or improper operation,
Unit failure as a result of operation on improper line voltage or
excessive phase imbalance constitutes abuse and may cause
damage to electrical components. Such operation would void
any applicable Carrier warranty,
A05178
Fig. 3 - Filter Drier Components
Only use factory specified liquid-line filter driers with rated
working pressures less than 600 psig.
NOTE: Do not install a suction-line filter drier in liquid line.
Make Piping Sweat Connections
Remove plastic caps from liquid and suction service valves. Use
refrigerant grade tubing. Service valves are closed from the factory
and are ready for brazing. After wrapping the service valve with a
wet cloth, the tubing set can be brazed to the service valve using
either silver bearing or non-silver bearing brazing material.
Consult local code requirements. Refrigerant tubing and the indoor
coil are now ready for leak testing.
NOTE: Unit is shipped with Puron (R-410A) refrigerant factory
charge indicated on nameplate. Unit is factory-charged for 15 ft
(4.6 m) of line-set.
Pass nitrogen or other inert gas through piping while brazing to
)revent formation of copper oxide.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage
or improper operation,
To prevent damage to unit or service valves observe the
following:
• Use a brazing shield,
• Wrap service valves with wet cloth or use a heat sink
material.
ELECTRICALSHOCK HAZARD
Failure to follow this warning could result in personal injury or
death.
Before perfornfing service or maintenance, be sure indoor unit
main power switch is turned OFF and indoor blower has
stopped.
Control Circuit Wiring
Control voltage is 24 v (40 va nfininmm). See Fig. 4 and unit label
diagram for field-supplied wiring details. Route control wire
through opening in unit side panel to connection in unit control
box.
COOL--BLU _ -- -- =_ 24VACSUPPLY
H
REOU[RED
COHHON(C)--BRN _ -- --
FIELD 5UPPLIED
T'STAT WIRE
OUTDOOR UNIT INDOOR UNIT
LOW VOLTAGE CONNECTIONS
A07398
Fig. 4 - 38HDR Typical Control Circuit Connections
NOTE: Use No. 18 AWG color-coded, insulated (35°C
nfininmm) wire. If thermostat is located more than 100 ft (30.5 m).
from unit, as measured along the control voltage wires, use No. 16
AWG color-coded wire to avoid excessive voltage drop.
NOTE: All wiring must conform to NEC and local codes.
NOTE: Operating unit on improper line voltage constitutes abuse
and could affect Carrier warranty. See Product Data. Do not install
unit in a system where voltage may fluctuate above or below
pernfissible linfits.