Carrier 38EYX Instructions D'installation page 3

Step 5—Elevate Unit
Accumulation of water and ice in base pan may cause
equipment damage.
Elevate unit per local climate and code requirements to provide
clearance above estimated snowfall level and ensure adequate
drainage of unit.
Step 6—Check Indoor Expansion Device
Check indoor coil piston to see if it matches the required
piston shown on outdoor unit rating plate. If it does not
match, replace indoor coil piston with correct piston. Failure
to follow this caution could result in unit damage.
Step 7—Check Defrost Thermostat
Check defrost thermostat to ensure it is properly located and
securely attached. Find the liquid tube with a brass distributor and
feeder tubes going into outdoor coil. At the end of 1 of the feeder
tubes, there is a 9.5 mm OD stub tube approximately 7.6 cm long.
(See Fig. 4.) The defrost thermostat should be located on stub tube.
Note that there is only 1 stub tube used with feeder tube, and on
most units it is the bottom circuit.
Step 8—In Long-Line Applications, Install Liquid-Line
Solenoid Valve (LSV)
For refrigerant piping arrangements with equivalent lengths
greater than 15 m and/or when elevation difference between indoor
and outdoor unit is greater than ±6 m, follow all requirements of
the Long-Line Guideline section in the Application Guideline and
Service Manual for Residential Split-System Air Conditioners and
Heat Pumps Using Puron® Refrigerant.
FEEDER TUBE
Fig. 4—Defrost Thermostat Location
If required by Long-Line Application Guideline, install LSV kit
part No. KHALS0401LLS specifically designed for Puron® Heat
Pump. LSV should be installed within 60 cm of the outdoor unit
with flow arrow pointing toward outdoor unit, as close as possible
to filter drier. Follow the Installation Instructions included with
accessory kit.
IMPORTANT: Flow arrow must point toward outdoor unit.
All manuals and user guides at all-guides.com
STUB TUBE
DEFROST
THERMOSTAT
A97517
3
Step 9—Making Piping 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.
Do not leave system open to atmosphere any longer than
minimum required for installation. POE oil in compressor is
extremely susceptible to moisture absorption. Always keep
ends of tubing sealed during installation. Failure to follow this
caution could result in unit damage.
If ANY refrigerant tubing is buried, provide a 15 cm vertical
rise at service valve. Refrigerant tubing lengths up to 91 cm
may be buried. Do NOT bury tubing lengths over 91 cm.
Failure to follow this caution could result in unit damage.
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.
Outdoor units may be connected to indoor section using accessory
tubing package or field-supplied refrigerant grade tubing of correct
size and condition. For tubing requirements beyond 15 m, sub-
stantial capacity and performance losses can occur. Following the
recommendations in the Application Guideline and Service
Manual for Residential Split-System Air Conditioners and Heat
Pumps using Puron® Refrigerant to minimize losses. Refer to
Table 1 for field tubing diameters. Refer to Table 2 for accessory
requirements.
Refrigerant tubes and indoor coil must be evacuated to 500
microns to minimize contamination and moisture in the system.
OUTDOOR UNIT CONNECTED TO FACTORY-APPROVED
INDOOR UNIT
These outdoor units are carefully evaluated and listed with specific
indoor coils for proper system performance.
IMPORTANT: Do not apply indoor coils which are not factory
approved to these units.
INSTALL ADAPTER TUBE
1. Remove plastic retainer holding outdoor piston in liquid
service valve.
2. Check outdoor piston size with matching number listed on unit
rating plate.
3. Locate plastic bag taped to unit containing adapter tube.
4. Remove Teflon washer from bag and install on open end of
liquid service valve. (See Fig. 5.)
5. Remove adapter tube from bag and connect threaded nut to
liquid service valve. Tighten nut finger tight and then with
wrench an additional 1/12 turn (15 ft-lb/20 n-m). DO NOT
OVERTIGHTEN.