Unit Charging; Refrigerant Gauge Removal; Refrigerant Leaks; Refrigerant Charge - Thermo King T-1000R Series Maintenance Manual

Unit Charging

NOTE: Before charging, make sure that the
refrigerant lines from the gauge manifold to the
refrigerant supply bottle have been evacuated or
purged.
1. Backseat the suction service valve and make
sure the receiver tank outlet valve is still open.
2. Set the refrigerant supply bottle for liquid and
open the gauge manifold hand valve. Add
liquid refrigerant until the system has the
recommended refrigerant charge (see unit
serial number nameplate or the
"Specifications" chapter), or until the system
will take no more liquid. The remainder of the
charge will be added as a liquid through the
suction service valve if more refrigerant is
required.
3. After the liquid refrigerant is added, close the
gauge manifold hand valve.
4. Back seat (close) the receiver tank outlet
valve, remove the evacuation station hoses,
and install the cap on the service port for the
receiver tank outlet valve.
5. If the unit is not fully charged, attach the
gauge manifold set to the suction service valve
and the discharge service valve. Open the
suction service valve one turn and open the
discharge service valve 1/4 turn.
6. Open the refrigerant supply valve for liquid.
7. Start the unit and use the Service Test mode to
run the unit in high speed cool. See the
appropriate Microprocessor Diagnostic
Manual for information about the Service Test
mode.
8. Observe the suction pressure and slowly open
the gauge manifold hand valve to allow liquid
refrigerant to flow into the suction service
valve. Control the liquid flow so the suction
pressure increases approximately 20 to 25 psig
(138 to 172 kPa).
9. Add refrigerant until the system has the
recommended refrigerant charge (see unit
serial number nameplate or the
"Specifications" chapter). Then close the
gauge manifold hand valve and the refrigerant
supply bottle hand valve.
Refrigeration Service Procedures

Refrigerant Gauge Removal

1. Operate the unit in cool mode.
2. Backseat the discharge service valve.
3. Open both service manifold hand valves.
4. Front seat the suction service valve and pump
down the compressor to a 20 in. Hg vacuum
(-68 kPa).
5. Stop the unit.
6. Establish a compressor crankcase pressure
between 1 and 3 psig (7 and 21 kPa).
7. Remove the gauge line from the suction
service valve and cap the service port.
8. Remove the gauge line from the discharge
service valve and cap the service port.
9. Back seat the suction service valve.
10. Install and tighten service valve stem caps.
11. Unit is ready for a functional check out.

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.
NOTE: 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.
3. Run the unit on high speed cool until the air in
the box indicates 0 F (-18 C).
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