Installation guide

D.OUTDOORUNITHIGHERTHANINDOORUNIT
Properoil returntothecompressorshouldbemaintainedwith
suctiongasvelocity.Ifvelocitiesdropbelow1500fpm(feetper
minute),oil returnwill bedecreased.Tomaintainsuctiongas
velocity, do not upsize vertical suction risers.
E. LIQUID LINE FILTER-DRIER
NOTE: It is required that an approved filter drier (XH-6 with
25% activated alumina / 75% molecular sieve desiccants) be
installed in the liquid line due to the POE oil.
Leave the plugs in the tube ends until the filter-drier is installed.
The optimal location for the filter-drier is close to the indoor coil.
Install the filter-drier with the arrow pointing towards the indoor
coil. Refer to Fig. 4.
FIRE HAZARD
Failure to follow 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.
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.
A05178
Fig. 4 - Liquid Line Filter Drier Installed at Indoor Unit
F. SERVICE VALVES
Service valves are closed and tube stubs are plugged from the
factory. Outdoor units are shipped with a dry nitrogen holding
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.
Service valve bodies are brass and tube stubs are copper.
G. BRAZING CONNECTIONS
NOTE: Remove valve core from schrader port on both Service
Valves BEFORE brazing. This helps prevent overheating and
damage to valve seals (refer to Fig. 5). Replace valve core when
brazing is completed.
VALVE SERVICE
CORE
Fig. 5 - Service Valve
UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit component
damage.
Service valves must be wrapped while brazing in a heat
sink material, such as a wet cloth.
H. OPENING SERVICE VALVES
Outdoor units are shipped with a dry nitrogen holding charge
sealed in the unit. Opening the service valves releases this charge
into the system.
NOTE: Open the Suction service valve first. If the Liquid service
valve is opened first, oil from the compressor may be drawn into
the indoor coil TXV, restricting refrigerant flow and affecting
operation of the system.
Remove Suction service valve cap and insert a hex wrench into the
valve stem. Hold the valve body steady with an end-wrench and
back out the stem by turning the hex wrench counterclockwise.
Turn the stem until it just contacts the rolled lip of the valve body.
After the nitrogen charge has bled into the system, open the Liquid
service valve.
NOTE: These are not back-seating valves. It is not necessary to
force the stem tightly against the rolled lip.
The service valve cap is a primary seal for the valve and must be
properly tightened to prevent leaks. Make sure cap is clean and
apply refrigerant oil to threads and sealing surface on inside of cap.
Tighten cap finger tight and then tighten additional 1/6 of a turn (1
wrench flat) to properly seat the sealing surfaces.
I NOTE: Using the service ports (or gauge set), release the I
nitrogen pressure from the system before attaching vacuum
pump.