21
Refrigerant Line Components
Suction line refrigerant components necessary for field
installation in the suction line are a filter (Core Type),
access valves (ports), Frostat
TM
control for coil frost
protection, and ball shutoff valves. They are placed in the
Suction line as illustrated in Figure 3-7.
The required refrigerant components include a filter drier
(Core Type), access valve(s) or (ports), solenoid valve(s),
moisture indicating sight glass, expansion valve(s), and ball
shutoff valve(s). They are placed in the liquid line as shown
in Figure 3-7.
Suction And Liquid Line Filter/Filter Drier (Field
Supplied)
Install the filter in the suction line upstream of the
compressors. It should be installed so the canister is at
either a 45 or 90 degree angle to prevent oil accumulation.
Install the filter drier in the liquid line as close as possible to
the expansion valves. Locate them upstream of the
moisture indicator and solenoid valve.
Refer to the Filter/Filter Drier Table for recommendations.
Liquid Line Moisture Indicator Sight Glass
To aid in troubleshooting, install a moisture indicator sight
glass in the liquid line near the evaporator, down stream of
the solenoid valve prior to any branch takeoffs to the
expansion valve. The sight glass should not be used to
determine adequate refrigerant charge or sub-cooling.
Actual temperature measurements are required to
determine proper charge and sub-cooling.
Refer to the Solenoid Valve/Moisture Indicator Sight Glass
Table for recommendations.
Liquid Line Solenoid Valves
Liquid line isolation solenoid valves are required for
refrigerant migration control into the evaporator during the
“Off” cycle and should be connected as illustrated in the
applicable field connection diagram.
Under certain conditions, liquid line solenoid valves may be
used to trim the amount of active evaporator as
compressors unload. Generally, the trim solenoid valve is
unnecessary on comfort cooling VAV systems, and is only
required on CV systems when dehumidification is a
concern.
Refer to the Solenoid Valve/Moisture Indicator Sight Glass
Table for recommendations.
Thermostatic Expansion Valve (TEV)
Trane recommends a balance-ported externally equalized
valve in order to maintain satisfactory superheat control
down to lower valve loading conditions and to compensate
for pressure drops between the expansion valve and
superheat control point (evaporator refrigerant outlet).
In order to get proper refrigerant distribution into the coil, an
expansion valve is required for each coil distributor.
Access Valves (Ports)
The access ports in the liquid line allows the unit to be
charged with liquid refrigerant and is used to determine
sub-cooling.
The access ports in the sucton line allows the operating
suction pressure to be checked across the suction line filter.
These ports are usually a Schraeder valve with core.
Ball Shutoff Valves
The ball shutoff valve allows for isolation of the Filter/Filter
Drier for easier core replacement.
Two ball shutoff valves equal to the OD Tubing size for both
the liquid line and suction line are required.
Frostat
TM
Coil Frost Protection
The Froststat control is the preferred method of coil frost
protection. The Frostat control bulb is mechanically
attached to the suction line near the evaporator and wired
to the unit control panel. Refer to the proper field
connection diagram for details.
Filter / Filter Drier Recommendations
Capacity Suction Line
(Sporlan)
Filter Core
(Sporlan)
Liquid
Line
(Sporlan)
Filter
Drier
Core
(Sporlan)
80 Ton RSF-5621-T RPE-48-BD C-967-G RCW-48
100 Ton RSF-5621-T RPE-48-BD C-969-G RCW-48
120 Ton RSF-9625-T RPE-48-BD C-969-G RCW-48
Use specific parts listed or equivalent. (Per Circuit)
Solenoid Valve &
Sight Glass w/Moisture Indicator
Capacity Solenoid
Valve
(Sporlan)
Solenoid Valve
Coil (Sporlan)
Sight Glass with
Moisture Indicator
(Sporlan)
80 Ton E25S270 MKC-2 @ 120V SA-17S
100 Ton E25S290 MKC-2 @ 120V SA-19S
120 Ton E34S290 MKC-2 @ 120V SA-19S
Use specific parts listed or equivalent. (Per Circuit)
Installation (Continued)
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