INSTALLATION INSTRUCTIONS R−410A Split System Air Conditioner
421 01 5103 00 7
!
CAUTION
UNIT OPERATION HAZARD
Failure to follow this caution may result in im-
proper product operation.
Do not bury more than 36” (1m) of line set under-
ground. Refrigerant may migrate to cooler buried
section during extended periods of unit shut−
down, causing refrigerant slugging and possible
compressor damage at start−up.
If ANY section of the line set is buried under-
ground, provide a minimum 6” (152mm) vertical
rise at the service valve.
D. OUTDOOR UNIT HIGHER THAN INDOOR UNIT
Proper oil return to the compressor should be maintained
with suction gas velocity. If velocities drop below 1500
fpm (feet per minute), oil return will be decreased. To
maintain suction gas velocity, do not upsize vertical
suction risers.
E. LIQUID LINE FILTER−DRIER
Outdoor units are shipped with an appropriate filter−drier
for installation in the liquid line. 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 Figure 6.
Figure 6
Liquid Line Filter−Drier
Installed at Indoor Coil
38−11−84
Filter−Drier
(arrow points towards indoor coil)
F. SERVICE VALVES
Service valves are closed and tube stubs are 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.
Service valve bodies are brass and tube stubs are
copper.
Figure 7 Service Valve
VALVE CORE
SERVICE VALVE
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 Figure 7).
Replace valve core when brazing is completed.
!
WARNING
FIRE HAZARD
Failure to remove refrigerant and oil charge be-
fore brazing 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 be-
fore 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.
!
CAUTION
PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in product dam-
age.
Braze with Sil−Fos or Phos−copper alloy on cop-
per−to−copper joints and wrap a wet cloth around
rear of fitting to prevent damage to TXV.
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