Carrier 38BYW, Installation And Start-Up Instructions Manual

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Remove indoor coil piston if unit is to be installed on system
with a TXV metering device.
Step 8—Remove Indoor AccuRater® Piston and Install
TXV
For proper unit operation and reliability, units must be
installed with a field-supplied hard shut-off TXV. Do not
install with evaporator coils having capillary tube metering
devices or piston.
After removing existing AccuRater from indoor coil, install
field-supplied bi-flow hard shut-off TXV kit. (See Fig. 5 and 6.)
For TXV kit part number and charging instruction, refer to TXV
label on your unit. If indoor unit (fan coil) comes factory equipped
with a bi-flow hard shut off TXV, no TXV change is required.
Install TXV kit to indoor coil as follows:
1. Install suction tube adapter.
2. Install liquid flare-to-sweat adapter.
3. Connect external equalizer tube to fitting on suction tube
adapter.
4. Position sensing bulb on horizontal portion of suction tube
adapter. Secure using supplied hardware.
5. Insulate bulb after installation. (See Fig. 5.)
6. Leak check all connections.
Step 9—Make Tubing Connections
Relieve pressure and recover all refrigerant before system
repair or final unit disposal to avoid personal injury or death.
Use all service ports and open all flow-control devices,
including solenoid valves.
To prevent compressor damage DO NOT bury more than 36
in. of refrigerant tubing. If ANY tubing is buried, provide 6
in. vertical rise at service valve.
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.
Connect outdoor unit to indoor sections using accessory tubing
package or field-supplied tubing of refrigerant grade, correct size,
and condition. For tubing requirements beyond 50 ft, consult your
local distributor or the Long-Line Application Guideline. Refer to
Fig. 7 for refrigerant tube dimensions and connections.
If refrigerant tubing or indoor coil is exposed to atmosphere, it
must be evacuated to a minimum of 500 microns to eliminate
contamination and moisture in the system.
SWEAT CONNECTION
1. Consult local code requirements.
2. Remove plastic retainer holding outdoor piston in the liquid
service valve and connect sweat/flare adapter provided to
valve. (See Fig. 8.)
Fig. 5—Typical TXV Installation
A88382
THERMOSTATIC
EXPANSION
VALVE
EQUALIZER
TUBE
SENSING
BULB
COIL
Fig. 6—Positioning of Sensing Bulb
A81032
2 O'CLOCK
10 O'CLOCK
SENSING BULB
STRAP
SUCTION TUBE
8 O'CLOCK 4 O'CLOCK
7 ⁄
8
IN. OD & SMALLER LARGER THAN
7 ⁄
8
IN. OD
Fig. 7—Refrigerant Tube Dimensions/Connections
UNIT SIZE
LIQUID TUBE VAPOR TUBE
Conn Dia Tube Dia Conn Dia Tube Dia
024 3/8 3/8 5/8 5/8
030, 036 3/8 3/8 3/4 3/4
042, 048 3/8 3/8 7/8 7/8
060 3/8 3/8 7/8 1-1/8
NOTE: Tube diameters are for lengths up to 50 ft. For tubing lengths greater
than 50 ft, consult your local distributor.
A97009
LIQUID LINE CONN
FIELD CONTROL
SUPPLY CONN
7
⁄
8
″
DIA HOLE
FIELD POWER
SUPPLY CONN
7
⁄
8
″
DIA HOLE WITH
1
1
⁄
8
″
DIA KNOCKOUT
AND 1
3
⁄
8
″
DIA
KNOCKOUT
AIR DISCHARGE
SUCTION LINE CONN
3