Thermo King T-500R Maintenance Manual page 199

Unit Identification
Units charged with R-404A/R-452A/R-134A are identified by the following methods:
1. R-404A/R-452A/R-134A will be stamped on the unit's serial plate.
2. Decals will be applied to unit as shown below:
Availability
R-404A/R-452A/R-134A is available from wholesalers. The price will depend upon the quantity purchased. Thirty (30), 50
and 125 containers are available.
Leak Detection
Leaks can be detected by an electronic leak detector such as the G.E. H10G or a portable leak detector (see Tool Catalog). See
Truck and Trailer Service Bulletin T&T 048 for additional details.
Compressor Oil
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-404A/R-452A and can be used in low temperature applications. This oil is available from service parts (P/N
203-513).
Compressors Shipped with POE Oil
Thermo King compressors are charged with Polyol Ester oil (POE). All gauge fittings are 1/4 inch fittings.
CAUTION: POLYOL ESTER (POE) IS THE ONLY OIL FOR USE WITH THERMO KING UNITS USING
R-404A/R-452A. IT SHOULD NOT BE MIXED WITH ANY OTHER TYPE.
Because Polyol Ester has an affinity for moisture, it must be kept in capped containers. In addition, it should be added as the
last step in system repair. Rubber gloves are recommended when handling Polyol Ester because it may cause skin irritation.
Equipment Recommendations For Use With R-404A/R-452A
Dedicated Equipment
CAUTION: Equipment that has been used with other refrigerants MUST NOT be used with R-404A/R-452A
refrigerants. Mixing R-404A/R-452A with other refrigerants will cause contamination of the refrigerant. Using
contaminated refrigerant will cause system failure.
Vacuum Pumps
When evacuating, a two stage, five to seven CFM pump is recommended. It is also recommended that dry nitrogen be used
first. Ideally, a new vacuum pump should be used and dedicated for use with R-404A/R-452A systems because residual
refrigerants may remain in used vacuum pumps.
Pumps used with other Thermo King refrigerants may be used but extreme care should be taken to prevent contamination of
R-404A/R-452A systems with other refrigerants.
The Thermo King Evacuation Station is recommended. This station is available from service parts (see Tool Catalog). See
Truck and Trailer Service Bulletin T&T 061 for additional details.
Use only recommended vacuum pump oils and change oil after every major evacuation. Vacuum pump oils are highly refined
and the use of contaminated oils will prevent the desired vacuum from being obtained. Failure to follow these recommendations
may result in conditions that will destroy the vacuum pump.
Example of decal - R-404A/R-452A/R-134a Decal
Refrigeration Maintenance
R 134a
F-GAS
GWP
>150
Ky oto Protocol !
REFRIGERANT TYPE / GWP = 1430
203-516
POLYOL ESTER ISO 35
COMPRESSOR OIL TYPE
10-15