Table of Contents
Advertisement
N4H7T: Installation Instructions
Brazing Connections
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.
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.
Table 2 – Refrigerant Connections and Recommended Liquid and
Vapor Tube Diameters (In.)
LIQUID
UNIT SIZE
Connection
Diameter
024
3/8
036
3/8
048, 060
3/8
*. 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.
Notes:
1.Do not apply capillary tube indoor coils to these units.
2.For Tubing Set lengths between 80 and 200 ft. (24.38 and 60.96 m) horizontal or
20 ft. (6.1 m) vertical differential, refer to the Residential Piping and Longline
Guideline.
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
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.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
RATED VAPOR
Tube
Connection
Diameter
Diameter
Diameter
3/8
3/4
3/8
7/8
3/8
7/8
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
is completed.
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
Tube
and joint. Wrap service valves with a heat sinking material such as a wet
cloth.
3/4
Braze joints using a Sil-Fos or Phos-copper alloy.
7/8
Install Liquid Line Filter Drier Indoor
1-1/8
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage or
improper operation.
1. Installation of filter drier in liquid line is required.
2. Filter drier must be wrapped in a heat-sinking material such as a
wet cloth while brazing.
Refer to
Fig. 6
and install filter drier as follows:
1. Braze 5 in. (127 mm) liquid tube to the indoor coil.
2. Wrap filter drier with damp cloth.
3. Braze filter drier to 5 in. (127 mm) long liquid tube from step 1.
4. Connect and braze liquid refrigerant tube to the filter drier.
Refrigerant tubing and indoor coil are now ready for leak testing. This
check should include all field and factory joints.
4
Fig.
5). Replace valve core when brazing
Fig. 5 – Vapor Service Valve
CAUTION
!
Fig. 6 – Liquid Line Filter Drier
A14236
A05227
Advertisement
Table of Contents
