Thermo King 914 724, Manual

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Refrigeration Service Operations (Rev. 1/99)
64
IN-LINE CONDENSER CHECK VALVE
REPLACEMENT
Removal
1. Remove the refrigerant charge.
2. Place a heat sink on the check valve.
3. Unsolder the lines and remove the check valve.
Installation
Note: A heat sink must be used on the in-line check valve
when it is being soldered in place to prevent damage to the
neoprene seal.
1. Clean the tubes for soldering.
2. Place the check valve in position. The arrow on the
valve body indicates direction of refrigerant flow
through the valve.
3. Place a heat sink on the check valve.
4. Solder the inlet and outlet connections.
5. Pressurize the refrigeration system and test for leaks.
6. If no leaks are found, evacuate the system.
7. Recharge the unit with the proper refrigerant and check
the compressor oil.
O-Ring Seal (ORS) Connections
Replacement
1. Close the receiver outlet valve, pump down the low
side, and equalize the pressure to slightly positive.
2. To break the threaded line connections use two
wrenches. A rubber O-ring is used at line connections
to assure a positive seal. Install a new O-ring whenever
a line connection has been broken.
3. Before the line is connected, apply clean compressor oil
to the O-ring. Hand tighten the connector nut on the
line against the line fitting. Support the line fitting with
a wrench and tighten the connector nut with another
wrench until the fitting bottoms out. The connection
bottoms out when tight, reducing the chance of over
and under torque.
NOTE: ORS O-rings are made of a material with a
certain hardness. Do not substitute other O-rings. Use
only O-rings from Thermo King service parts.
1. Valve Fitting
2. O-ring
3. Connecting Nut
O-ring Seal (ORS)
1
AGA300
2
3