Carrier 25HNB5 - Make Piping Connections; Outdoor Unit Connected to Factory Approved Indoor Unit

3
Table 1—Accessory Usage
ACCESSORY
REQUIRED FOR LOW–AMBIENT
COOLING APPLICATIONS
(Below 55F / 12.8C)
REQUIRED FOR
LONG LINE APPLICATIONS*
REQUIRED FOR
SEA COAST APPLICATIONS
(Within 2 miles / 3.22 km)
Accumulator Standard Standard Standard
Compressor Start Assist
Capacitor and Relay
Ye s Ye s No
Crankcase Heater Ye s
Ye s
No
Evaporator Freeze Thermostat
Ye s
(for non–Infinity systems only)
No No
Isolation Relay
Ye s
(for non–Infinity systems only)
No No
Liquid Line Solenoid Valve No See Long–Line Application Guideline No
Motor Master Control or
Low Ambient Switch
Ye s
(for non–Infinity systems only)
No No
Support Feet Recommended No Recommended
* For tubing line sets between 80 and 200 ft. (24.38 and 60.96 m) and/or 20 ft. (6.1 m) vertical differential (250 ft./ 76.2 m)Total Equivalent Length), refer to Residential Piping and
Longline Application Guideline.
Make Piping Connections
!
WARNING
PERSONAL INJURY / ENVIRONMENTAL HAZARD
Failure to follow this warning could result in personal injury
or death.
Relieve pressure and recover all refrigerant before system
repair or final unit disposal.
Use all service ports and open all flow–control devices,
including solenoid valves.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
If ANY refrigerant tubing is buried, provide a 6 in. (152.4
mm) vertical rise at service valve. Refrigerant tubing lengths
up to 36 in.(914.4 mm) may be buried without further
special consideration. Do not bury lines longer than 36 in.
(914.4 mm).
CAUTION
!
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:
SUse a brazing shield.
SWrap 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 80 ft/24.38 m,
substantial capacity and performance losses can occur . Following
the recommendations in the Long Line Guideline for Split–System
Air Conditioners and Heat Pumps will reduce these losses. Refer to
Table 1 for accessory requirements. Refer to Table 2 for field
tubing diameters.
If refrigerant tubes or indoor coil are exposed to atmosphere, they
must be evacuated to 500 microns to eliminate contamination and
moisture in the system.
Outdoor Unit Connected to Factory Approved
Indoor Unit
Outdoor unit contains approximate system refrigerant charge for
operation with approved AHRI rated indoor unit when connected
by 15 ft (4.57 m) of field–supplied or factory–accessory tubing,
and factory supplied filter drier. Some indoor units require
additional subcooling to achieve optimal heating performance.
Using Table 3 – Additional Subcooling Required, check refrigerant
charge for maximum efficiency
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 seal from bag and install on open end of
liquid service valve. (See Fig. 4.)
5. Remove adapter tube from bag and connect threaded nut to
liquid service valve. Tighten nut finger–tight and then with
wrench an additional 1/2 turn (15 ft–lb). DO NOT OVER
TIGHTEN!
A05226
Fig. 4 --- Liquid Service Valve
25HNB5