Installation Manual

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Specifications subject to change without notice.
3. Find plastic bag taped to unit containing copper adapter
tube, brass nut, and plastic washer.
4. Install plastic washer in the seat inside piston body.
5. Fit brass nut onto adapter tube and install tube onto liquid
service valve. Tighten nut finger tight, then wrench
additional ½ turn only [15- ft lbs (20.3 N- m)]. Over
tightening may damage the plastic washer and service
valve’s piston body.
PISTON BODY
LIQUID SERVICE VALVE
PISTON
PLASTIC WASHER
ADAPTER TUBE
BRASS NUT
A14235
Fig. 4 – Liquid Service Valve with Heating Piston and
Adapter Tube
VALVE CORE
SERVICE VALVE
A14236
Fig. 5 – Vapor Service Valve
Brazi ng 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 while brazing.
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 braz i ng is compl eted.
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.
!
WARNING
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 2 – Refrigerant Connections and Recommended Liquid
and Vapor Tube Diameters (In.)
UNIT SIZE
LIQUID RATED VAPOR
Connection
Diameter
Tube
Diameter
Connection
Diameter
Tube
Diameter
18, 24, 30 3/8 3/8 3/4 3/4
36, 42, 48 3/8 3/8 7/8 7/8
60 3/8 3/8 7/8 1–1/8
* 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 capilla ry 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. (6.09 m) vertical differential 250 ft. (76.2 m) Total Equivalent Length, refer to
the Residential Piping and Longline Guideline – Air Conditioners and Heat Pumps
using R- 410A refrigerant.
Installing with Indoor Piston
Heat pumps with piston indoor ratings are shipped with the correct
piston size in the accessory bag. Check piston size shipped with
indoor unit to see if it matches required indoor piston size. If it
does not match, replace indoor piston with correct piston size
which is listed on the rating plate.
NOTE: Heat pumps without piston indoor ratings may be
installed as a replacement component in a piston system. When
installing a non- piston rated heat pump with a piston indoor the
correct indoor piston must be installed. When not listed on the
rating plate the correct piston size is listed in the product data.
Replacement pistons can be ordered from Replacement
Components.
13/16” BRASS HEX NUT
TEFLON® SEAL
TEFLON®
RINGS
3/4” BRASS HEX BOD
Y
“H” DISTRIBUTOR
PISTON RETAINER
PISTON
A10342
Fig. 6 – Indoor Piston Installation