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Refrigeration Maintenance
10-12
REFRIGERANT LEAKS
Use a reliable leak detector (e.g., electronic detector) to leak test the refrigeration system. Inspect for signs of oil leakage which
is the first sign of a leak in the refrigeration system.
It is normal for compressor shaft seals to have a slightly oily film.
REFRIGERANT CHARGE
Testing the Refrigerant Charge with an Empty Box (Controlled Check)
If the unit has an insufficient charge of refrigerant, the evaporator will be “starved” and the box temperature will rise even
though the unit is operating. The suction pressure will drop as the refrigerant charge decreases. The charge may be determined
by inspection of the refrigerant through the receiver tank sight glass with the following conditions established:
1. Close the truck box doors.
2. Install a gauge manifold. On units equipped with an ETV and a Premium HMI Control Panel the pressures may be viewed on
the screen.
3. Run the unit on high speed cool until the air in the box indicates 0 F (-18 C).
4. The discharge or head pressure gauge should read 290 to 310 psig (1999 to 2137 kPa).
If the pressure is below this, it can be raised by covering a portion of the condenser coil with a piece of cardboard.
5. The suction pressure gauge should be indicating 12 to 20 psig (83 to 138 kPa) gauge pressure.
6. Under these conditions, the ball in the receiver tank sight glass should be floating. If there is no indication of refrigerant in
the receiver tank sight glass, the unit is low on refrigerant.
Testing the Refrigerant Charge with a Loaded Box (Quick Check)
1. Install a gauge manifold (optional).
2. Run the unit on the Cool cycle.
3. Cover at least three quarters of the condenser to drive any excess refrigerant from the condenser into the receiver tank. Do not
cover the condenser for more than three minutes.
4. As the head pressure is rising, check the receiver tank sight glass. The ball should be floating. If there is no indication of
refrigerant in the receiver tank sight glass, the unit may be low on refrigerant. Perform a Controlled Check.
NOTE: If the ball floats, there is sufficient refrigerant in the unit for that load at that particular box temperature. This
test does not determine if the unit contains a full charge of refrigerant.
CHECKING COMPRESSOR OIL
The compressor oil should be checked when there is evidence of oil loss (oil leaks) or when components in the refrigeration
system have been removed for service or replacement. The oil level in the compressor oil sight glass should be 1/4 to 3/4 full.
Summary of Contents for T-1000R
Page 14: ...Safety Precautions 2 6 Warning Decals 2e24151g0 ...
Page 34: ...Maintenance Inspection Schedule 4 10 ...
Page 57: ...Unit Description 5 23 Purge Mode UT Series 1 3 4 5 2 ...
Page 67: ...Unit Description 5 33 Zone 1 Cool and Zone 2 Cool UT SPECTRUM Units ...
Page 69: ...Unit Description 5 35 Purge Mode UT SPECTRUM Units ...
Page 71: ...Unit Description 5 37 Zone 1 Cool and Zone 2 Heat UT SPECTRUM Units ...
Page 72: ...Unit Description 5 38 ...
Page 74: ...Diesel Electric Menu 6 28 Adjust Brightness 6 29 Time 6 30 ...
Page 120: ...Operating Instructions Standard HMI 7 18 ...
Page 152: ...Engine Maintenance 9 14 T Series Fuel and Oil System Components TK 376 ...
Page 154: ...Engine Maintenance 9 16 T Series Fuel and Oil System Components TK 270 ...
Page 156: ...Engine Maintenance 9 18 UT Series Fuel System Components AMA768 ...
Page 172: ...Engine Maintenance 9 34 T Series Engine Mounting Components for 2 Cylinder Engine ...
Page 184: ...Engine Maintenance 9 46 ...
Page 238: ...Refrigeration Maintenance 10 54 ...
Page 246: ...Clutch Maintenance 11 8 ...
Page 258: ...Structural Maintenance 12 12 ...
Page 264: ...Mechanical Diagnosis 13 6 ...
Page 265: ...14 Electric Standby Diagnosis ...
Page 268: ...Electric Standby Diagnosis 14 4 ...
Page 269: ...15 Refrigeration System Diagnosis ...
Page 272: ...Refrigeration System Diagnosis 15 4 ...
Page 280: ...Remote Evaporators 16 8 ...