26SPA6: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
3
Make Piping Connections
Outdoor units may be connected to indoor section using accessory
tubing package or field-supplied refrigerant grade tubing of correct size
and condition. Rated tubing diameters shown in Table 1 are
recommended up to 80 ft. (24 m). See Product Data for acceptable
alternate vapor diameters and associated capacity losses. For tubing
requirements beyond 80 ft. (24 m), substantial capacity and performance
losses can occur. Following the recommendations in the Residential
Piping and Long Line Guideline will reduce these losses. Refer to
Table 1 for field tubing diameters. Refer to the Product Data for
accessory requirements.
There are no buried-line applications greater than 36-in. (914 mm)
allowed.
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.
Refrigerant pipe should be installed with the minimum length possible
and practical for the application. Piping should be protected from
physical damage in operation and in service and be in compliance with
national and local codes such as ASRHAE 15, ASHRAE 15.2, IAPMO.
Uniform Mechanical Code, ICC International Mechanical Code, or CSA
B52. When piping is installed through studs in a wall, steel plates should
be used for protection with a minimum thickness of 16 gauge.
All field joints shall be accessible for inspection prior to being covered
or enclosed.
Outdoor Unit Connected to Factory Approved R-454B
Indoor Unit
When outdoor unit is connected to factory–approved R-454B indoor
unit, outdoor unit contains approximate system refrigerant charge for
operation with AHRI rated indoor unit when connected by 15 ft. (5 m) of
field–supplied or factory accessory tubing and factory supplied filter
drier. For all sizes, adjust charge by adding or removing 0.6 oz/ft of 3/8
liquid line above or below 15 ft. (5 m) respectively.
Connect vapor and liquid tubes to fittings on vapor and liquid service
valves (see Table 1). Use refrigerant grade tubing.
Service Valves
Service valves are closed and plugged from the factory. Outdoor units
are shipped with a refrigerant charge sealed in the unit. Leave the service
valves closed until all other refrigerant system work is complete or the
charge will be lost. Leave the plugs in place until line set tubing is ready
to be inserted.
Refrigerant Tubing Connection Outdoor
IMPORTANT: Maximum liquid-line size is 3/8-in. OD for all
residential applications including long line. Refer to Residential Piping
and Long Line Guideline for further information.
IMPORTANT: Always install the factory-supplied liquid-line filter
drier. If replacing the filter drier, refer to Product Replacement Parts List
for appropriate part number. Obtain replacement filter driers from your
distributor or branch.
Brazing Connection
If using brazing connections, use a properly sized swedge tool to create a
swedge (bell) on one of the two copper tubes being connected.
Alternatively, a copper coupling can be used which will require two
braze joints instead of one.
Clean line set tube ends with emery cloth or steel brush. Remove any grit
or debris.
Connect vapor tube to fitting on outdoor unit vapor service valves (see
Table 1). Connect liquid tubing to adapter tube on liquid service valve.
Use refrigerant grade tubing.
Apply heat absorbing paste or heat sink product between service valve
and joint. Wrap service valves with a heat sinking material such as a wet
cloth.
After wrapping service valve with a wet cloth, tubing set can be brazed
to service valve using either silver bearing or non–silver bearing brazing
material. Do not use soft solder (materials which melt below
800°F/427°C). Braze joints using a Sil-Fos or Phos-copper alloy.
Consult local code requirements.
Some outdoor units contain a mechanical fitting at the liquid distributor.
This connection is not field serviceable and should not be disturbed.
For Vapor Service Valve, remove valve core from schrader port on
Service Valve BEFORE brazing. This helps prevent overheating and
damage to valve seals (refer to Fig. 3). Replace valve core when brazing
is completed.
A14236
Fig. 3 – Vapor Service Valve
WARNING
!
PERSONAL INJURY AND 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.
Federal regulations require that refrigerant is not vented into the
atmosphere. Recover during system repair or final unit disposal.
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 mm) vertical
rise at service valve. Refrigerant tubing lengths up to 36-in (914 mm)
may be buried without further special consideration. Do not bury lines
more than 36-in. (914 mm).
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 while brazing.
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