Refrigeration Service Operations
144
High Pressure Relief Valve
Removal
1. Recover the refrigerant charge.
2. Unscrew and remove the high pressure relief
valve.
Installation
1. Apply a refrigerant Loctite to the threads of
the high pressure relief valve.
2. Install and tighten the high pressure relief
valve.
3. Pressurize the refrigeration system and test for
leaks. If no leaks are found, evacuate the
system.
4. Recharge the unit with refrigerant and check
the compressor oil.
Receiver Tank
Removal
1. Recover the refrigerant charge.
2. Unsolder the inlet tube from the receiver tank.
3. Unsolder the filter drier line from the receiver
tank outlet tube.
4. Unbolt the mounting brackets and remove the
receiver tank from the unit.
Installation
1. Place the receiver tank in the unit and install
the mounting bolts and nuts loosely. Position
the receiver tank so the sight glass is clearly
visible and the outlet tube lines up.
2. Solder the inlet tube to the receiver tank.
3. Solder the filter drier line to the receiver tank
outlet valve.
4. Tighten the receiver tank mounting hardware
securely.
5. Pressurize the refrigeration system and check
for leaks. If no leaks are found, evacuate the
system.
6. Recharge the unit with refrigerant.
R-404A
The refrigeration industry has introduced a new
refrigerant called R-404A. This refrigeration is
classified as a Hydro-fluorocarbon (HFC) because
it contains hydrogen fluorine and carbon. It does
not contain chlorine.
The capacities of these new refrigerants are
similar for box temperatures above 0 F (-18 C). At
temperatures below 0 F (-18 C), HFC refrigerant
capacities are slightly less than CFC refrigerants.
Unit Identification
Units charged with R-404A are identified by the
following methods:
1. 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.
3. Decals will be applied to unit as shown below:
Figure 167: R404A Decal
Availability
Refrigerant 404A 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 a electronic leak
detector such as the G.E. H10G or portable leak
detector (see Tool Catalog). See Truck and Trailer
Service Bulletin T&T 048 for additional details.
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