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Refrigeration Service Operations (Rev. 04/03)
117
R-134a and R-404A
The refrigeration industry has introduced two new
refrigerants called R-134a and R-404A. Both refrigerants
are classified as a Hydrofluorocarbon (H.F.C.) because they
contain hydrogen, fluorine and carbon. They do not contain
chlorine. R-134a was developed as a replacement for R-12
and R-404A was developed as a replacement for R-502.
Both R-12 and R-502 contain chlorine that presents a
hazard to the environment.
The pressure temperature relationship of R-134a is similar
to that of R-12 and the pressure temperature relationship of
R-404A is similar to that of R-502.
The capacities of these new refrigerants are similar for box
temperatures above 0 F (-18 C). At temperatures below 0 F
(-18 C), H.F.C. refrigerant capacities are slightly less than
CFC refrigerants.
Unit Identification
Units charged with R-134a or R-404A are identified by the
following methods:
1.
HFC-134a or HFC-404A will be stamped on the unit’s
serial plate.
2.
“HFC” may be incorporated in the model designation
on the sides of the unit such as “KD-II SR HFC”.
3.
Decals will be applied to unit as shown below.
Availability
Refrigerants 134a and 404A are available from wholesalers.
The price will depend upon the quantity purchased. Thirty
(30), 50 and 125 pound containers are available. When
purchasing R-134a in 30 pound or 50 pound containers,
specify industrial containers with 1/4 inch flare fittings to
receive containers with 1/4 inch flare fittings for use with
Thermo King truck unit applications.
NOTE: R-134a in disposable containers for automotive
applications is supplied in 30 pound and 50 pound
containers with Acme threads. See Warranty Bulletin 124
for specifics.
Leak Detection
Leaks can be detected by a Halogen leak detector such as
the G.E. H10G (TK No. 204-712) or portable leak detector
(TK No. 204-854). See Truck and Trailer Service Bulletin
T&T 048 for additional details.
Compressor Oil
As of January 1, 1993, Thermo King Corporation has
chosen to use a compressor oil called Polyol Ester (POE)—
also called ester based oil. POE oil is compatible with
R-134a and R-404A and can be used in low temperature
applications. This oil is available from service parts TK No.
203-413.
Summary of Contents for KD-II SR
Page 4: ......
Page 8: ......
Page 13: ...Safety Precautions Rev 04 03 v AEA40...
Page 14: ...Safety Precautions Rev 04 03 vi AEA38...
Page 33: ...Unit Description Rev 04 03 19 1 Evaporator 2 Access Door Rear View Curbside KD II SR 1 2 AEA38...
Page 37: ...Unit Description Rev 04 03 23 Power Receptacle Box KD II SR 50 AEA42...
Page 58: ...Remote Control Panel Features Rev 04 03 44...
Page 112: ...Refrigeration Maintenance Rev 04 03 98...
Page 120: ...106...
Page 146: ...132...
Page 156: ...142...
Page 162: ...148...
Page 170: ...156...
Page 172: ...158...
Page 173: ...159 KD II 30 Schematic Diagram Page 1 of 2...
Page 174: ...160 KD II 30 Schematic Diagram Page 2 of 2...
Page 175: ...161 KD II 30 Wiring Diagram Page 1 of 2...
Page 176: ...162 KD II 30 Wiring Diagram Page 2 of 2...
Page 177: ...163 KD II 50 Schematic Diagram Page 1 of 2...
Page 178: ...164 KD II 50 Schematic Diagram Page 2 of 2...
Page 179: ...165 KD II 50 Wiring Diagram Page 1 of 2...
Page 180: ...166 KD II 50 Wiring Diagram Page 2 of 2...
Page 181: ...167 KD II 50 SR 230 1 60 Wiring Diagram Page 1 of 2...
Page 182: ...168 KD II 50 SR 230 1 60 Wiring Diagram Page 2 of 2...