Leak Checking - Carrier 38EYX Installation And Start-Up Instructions Manual

Table 1—Refrigerant Connections and Recommended Liquid Line and Vapor Tube Diameters-In. (mm)
CONNECTION DIAMETER
UNIT
SIZE
Liquid
024 3/8 (9.5)
036 3/8 (9.5)
048 3/8 (9.5)
060 3/8 (9.5)
NOTES:
1. Tube diameters are for lengths up to 50 ft (15 m). For tubing lengths greater than 50 ft (15 m) horizontal and/or 20 ft (6 m) vertical differential, consult the Application
Guideline and Service Manual — Residential Split-System Air Conditioners and Heat Pumps Using Puron® Refrigerant.
2. Refrigerant tubes and indoor coils must be evacuated to 500 microns to minimize contamination and moisture in the system.
3. If required by local codes, Pressure Guard™ kit is available. See Product Data Digest for part numbers.
REFRIGERANT TUBING AND FILTER DRIER
Installation of filter drier in liquid line is required to avoid
performance loss due to plugged circuits or plugged expan-
sion devices, and to avoid compressor failure.
Connect vapor tubing to fittings on outdoor unit vapor service
valves. Connect liquid tube to filter drier. (See Table 1 and Fig. 6.)
Use refrigerant grade tubing. Connect other end of filter drier to
adapter tube on liquid service valve.
SWEAT CONNECTION
To avoid valve damage while brazing, service valves must be
wrapped in a heat-sink material such as a wet cloth.
Wrap service valves and filter drier with a wet cloth or heat-
sinking material. Braze connections using either silver bearing or
non-silver bearing brazing material. Do not use soft solder
(materials which melt below 800°F/427°C.) Consult local code
requirements.

LEAK CHECKING

Leak test all joints in indoor, outdoor, and refrigerant tubing.
EVACUATE REFRIGERANT TUBING AND INDOOR COIL
To avoid compressor damage never use the system compres-
sor as a vacuum pump.
Refrigerant tubes and indoor coil should be evacuated using the
recommended deep vacuum method of 500 microns. The alternate
triple evacuation method may be used if the procedure outlined
below is followed.
IMPORTANT: Never open system under vacuum to atmosphere
without first breaking it open with nitrogen.
Deep Vacuum Method
The deep vacuum method requires a vacuum pump capable of
pulling a vacuum of 500 microns and a vacuum gage capable of
accurately measuring this vacuum depth. The deep vacuum
method is the most positive way of assuring a system is free of air
and liquid water. (See Fig. 7.)
Triple Evacuation Method
The triple evacuation method should only be used when vacuum
pump is only capable of pumping down to 28 in. (71 cm) of
mercury vacuum and system does not contain any liquid water.
Refer to Fig. 8 and proceed as follows:
Vapor Liquid
5/8 (15.9) 3/8 (9.5)
3/4 (19.1) 3/8 (9.5)
7/8 (22.2) 3/8 (9.5)
1-1/8 (28.6) 3/8 (9.5)
Fig. 6—Filter Drier with Sweat Adapter Tube and
4
TUBE DIAMETER
Vapor
5/8 (15.9)
3/4 (19.1)
7/8 (22.2)
1-1/8 (28.6)
SWEAT/FLARE
ADAPTER
PISTON
PISTON BODY
LIQUID SERVICE VALVE
Fig. 5—Liquid Service Valve with Sweat Adapter
Tube
LIQUID-LINE
FILTER-DRIER
Liquid Tube
TUBE DIAMETER
(ALTERNATE)
Vapor
3/4(19.1)
5/8, 7/8 (15.9, 22.2)
3/4 (19.1)
7/8 (22.2)
TEFLON
SEAL
A01214
LIQUID
SERVICE
VALVE
A01215