Form O-Y P/N 273647R5, Page 11
Thermostatic
Expansion Valves
All refrigeration circuits have a thermostatic expansion valve. Thermostatic expansion
valves do not have replaceable parts. If a replacement valve is required, it must be for
R-410A refrigerant and must be sized correctly for the application. All refrigerant ser-
vice should be performed by a service technician qualied in R-410A refrigerant.
Replacement valve P/N's by Model, size, and circuit are listed in the table. Locations
are shown in FIGURES 8 through 14, shown on pages 11 through 14.
Thermostatic
Expansion Valve
Thermostat Expansion (TXV) Valves by Circuit and P/N
Model / Size A B DH - Low Enthalpy DH - High Enthalpy
YDHA & YDMA 060 234987 -- 207303 --
YDHA 090 220556 -- -- 207303
YDMA 090 220556 -- 207303 --
YDHA & YDMA 120 234987 234987 -- 207303
YDSA 120 234960 234960 -- --
YDHA & YDMA 150 220555 220555 -- 207303
YDSA 150 220555 220555 -- --
YDHA & YDMA 180 220555 220555 207303 234960
YDSA 180 220555 220555 -- --
YDSA 210 220556 220555 -- --
YDHA & YDMA 210 220556 220556 207303 234960
YDHA & YDMA 240 220556 220556 207303 234960
YDHA & YDMA 300 261175 221175 234960 235729
YDHA & YDMA 360 220558 220558 234960 235729
Circuit A-1&2
Condenser Coil
Condenser Coil
Circuit A-1
Circuit A-1
Circuit A-2
View from Compressor and
Evaporator
Compressor
Solenoid
Filter
(Evaporator Coil Side)
Coil
Tube
Valve
Model JDHA 062 and 092 (Cabinet 0)
Circuit A-2
Circuit A-1
Circuit A-2
Coil with
Single Circuit
Modulating
Valve
Drier
Evaporator
Equalizer
TXV
Condenser Section Side
View from Cooling Cabinet Door
Refrigerant Circuits - Standard Cooling without Optional Bypass Valve or Reheat
FIGURE 8 - Cooling
Circuit - Models
YDHA and YDMA
Sizes 060 and 090
3.5 Coils and Related Components (cont'd)
Seasonal Usage - At the beginning of the cooling season, inspect and clean the
entire cooling coil cabinet including the condensate drain pan. Thoroughly clean dirt,
algae, grease, and other contaminants. Inspect condensate drain pan, trap, and pip-
ing; ll trap with water to ensure proper operation. During a wintertime shutdown of
the cooling system, it may be desirable to disconnect and remove all water from the
trap and drain to prevent freeze damage. If local building codes permit, trap may be
lled with an antifreeze solution. Or, piping may be designed with freeze plugs or
other freeze protection methods (such as a heat tape).
Year Round Usage - Climates or applications with cooling requirements year round
require more frequent inspections of the cooling coil cabinet and condensate drains.
Depending on climate, freeze protection of the trap may be required during non-
cooling days.
Condensate Drain
Use and Maintenance
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