25TPB7: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
4
Brazing 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.
Notes:
1.Do not apply capillary tube indoor coils to these units.
2.For Tubing Set lengths between 80 and 200 ft. (24 and 61 m) horizontal or
20 ft. (6.1 m) vertical differential, refer to the Residential Piping and Long Line
Guideline.
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). Consult local code requirements.
NOTE: Some outdoor units contain a mechanical fitting at the liquid
distributor. This connection is not field serviceable and should not be
disturbed.
NOTE: For Liquid Service Valve - Braze lineset to adapter tube
BEFORE bolting adapter to valve. This helps prevent overheating and
damage to plastic washer or o-ring.
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. 5). Replace valve core when brazing
is completed.
A14236
Fig. 5 – Vapor Service Valve
Clean line set tube ends with emery cloth or steel brush. Remove any grit
or debris.
Insert line set tube ends into service valve tube stubs.
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.
Braze joints using a Sil-Fos or Phos-copper alloy.
Table 1 – Accessory Usage
Accessory
Required for Low Ambient
Cooling Applications
(Below 55°F / 12.8°C)
Required for Long Line
Applications
*
*. For tubing line sets between 80 and 200 ft. (24 and 61 m) and/or 20 ft. (6.1 m) vertical differential, refer to Residential Piping and Long Line Guideline.
Required for Sea Coast
Applications
(within 2 miles/3.2 km)
Compressor Start Assist Capacitor and Relay Yes Yes No
Crankcase Heater Yes (standard) Yes (standard) No
Evaporator Freeze Thermostat Yes No No
Hard Shutoff TXV
Yes
(standard w/factory approved
indoor unit)
Yes
(standard w/factory approved
indoor unit)
Yes
(standard w/factory approved
indoor unit)
High Pressure Switch Recommended Recommended No
Isolation Relay Yes No No
Liquid Line Solenoid Valve No
See Residential Piping
and Long Line Guideline
No
Low-Ambient Pressure Switch Yes No No
Support Feet Recommended No Recommended
WARNING
!
FIRE HAZARD
Failure to following this warning could result in personal injury, death
and/or property damage.
Refrigerant and oil mixture could ignite and burn as it escapes and
contacts brazing torch. Make sure the refrigerant charge is properly
removed from both the high and low sides of the system before brazing
any component or lines.
Table 2 – Refrigerant Connections and Recommended Liquid and
Vapor Tube Diameters (In.)
UNIT SIZE
LIQUID RATED VAPOR
*
*. Units are rated with 25 ft. (7.6 m) of lineset. See Product Data sheet for performance
data when using different size and length linesets.
Connection
Diameter
Tube
Diameter
Connection
Diameter
Tube
Diameter
024 3/8 3/8 3/4 3/4
036 3/8 3/8 7/8 7/8
048, 060 3/8 3/8 7/8 1-1/8
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.
CAUTION
!
BURN HAZARD
Failure to follow this Caution may result in personal injury.
Components will be HOT after brazing. Wear appropriate personal
protective equipment and allow to cool before handling parts and
equipment
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