28
The indoor split series comes with a holding charge. The charge
must be adjusted in the field based on performance. Refrigeration
piping on the split consists of installing a brazed copper line
set between the blower coil unit and the unit’s split compressor
section. To select the proper tube diameters for the installation,
refer to the Line Set Sizes table. Line sets over 60 feet long are not
recommended because of oil return and pressure drop problems.
The suction line must always be insulated. Handle and route the
line sets carefully to avoid kinking or bending the tubes. If the line
set is kinked or distorted and it cannot be formed back into its
original shape, the bad portion of the pipe should be replaced. A
restricted line set will affect the performance of the system.
Fasten the copper line set to the blower coil unit as instructed
by the coil installation instructions shown in Figure 14. Nitrogen
should be bled through the system at 2 to 3 PSI to prevent
oxidation inside the refrigerant tubing. Use a low silver phos-
copper braze alloy on all brazed connections.
Refrigeration
Replace caps after
opening system
Service ports for
attaching refrigerant
gauges
Insulated
Suction Line
Braze
Connection
Liquid
Line
ccw
ccw
Figure 13: Typical Split System Refrigerant Line Connections
Position
Description
System
Service
Port
CW - Full In
Shipping Position
Closed
Open
CCW - Full Out 1/2 turn CW
Service Position
Open
Open
CCW - Full Out
Operation Position
Open
Closed
TXV ("IN" toward condensing unit)
Equalizer Bulb
Suction
Liquid
TXV has internal check valve
Figure 14: Attaching the Air Coil
The indoor split service valves are recessed in the unit’s corner post
and protected by a cover. Remove the protective cover and braze
the line set to the service valve stubs as shown in Figure 13. Care
should be used when brazing the service valves as to not scorch the
paint. Nitrogen should be bled through the system at 2 to 3 psi to
prevent oxidation contamination. Use a low silver phos-copper braze
alloy on all brazed connections. Indoor split units are shipped with a
factory charge and service valves are not to be opened until the line
set has been leak tested, purged, and evacuated. Schrader cores
should be removed before brazing, and replaced after the valves
have cooled. A heat sink should be used on the service valve and
TXV to prevent damage caused by excessive heat. When brazing is
completed, reinstall the protective cover.
AFFINITY INDOOR SPLIT SERIES INSTALLATION MANUAL
Summary of Contents for YAZS022
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