Carrier 25HCA Installation Instructions Manual page 6

Table 2—Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters (In.)
UNIT SIZE
18, 24
30, 36
42, 48
60
Notes:
1. Tube diameters are for total equivalent lengths up to 80 ft..
2. Do not apply capillary tube or fixed orifice indoor coils to these units.
* For Tubing Set lengths between 80 and 200 ft. horizontal or 20 ft. vertical differential (250 ft.Total Equivalent Length), refer to the Longline
Application Guideline.
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 wrence an additional 1/2 turn (15 ft- -lb). DO NOT
OVER TIGHTEN!
Refrigerant Tubing and Sweat Connections
Connect vapor tube to fitting on outdoor unit vapor service
valves (see Table 2). Connect liquid tubing to adapter tube on
liquid service valve. Use refrigerant grade tubing.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Service valves must be wrapped in a heat- -sinking
material such as a wet cloth.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Installation of filter drier in liquid line is required.
LIQUID
Connection Diameter Tube Diameter
3/8
3/8
3/8
3/8
Install Liquid Line Filter Drier Indoor
Refer to Fig. 7 and install filter drier as follows:
Leak Testing
Leak test all joints indoors, outdoors, and refrigerant tubing.
Evacuate Refrigerant Tubing and Indoor Coil
Refrigerant tubes and indoor coil should be evacuated using the
recommended the recommended deep vacuum method of 500
microns. The alternate triple evacuation method may be used if
the procedure outlined below is followed.
IMPORTANT: Always break a vacuum with dry nitrogen.
6
VAPOR (up to 80 ft.)
Connection Diameter
3/8 5/8
3/8 3/4
3/8 7/8
3/8 7/8
1. Braze 5 in. liquid tube to the indoor coil.
2. Wrap filter drier with damp cloth.
3. Braze filter drier to 5 in. long liquid tube from step 1.
4. Connect and braze liquid refrigerant tube to the filter drier.
Fig. 7 --- Liquid Line Filter Drier
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Never use the system compressor as a vacuum pump.
Rated Tube Diameter
5/8
3/4
7/8
1- - 1/8
A05227