Thermo King T-1000R, Maintenance Manual

Page: 215 / 282

Refrigeration Maintenance 10-31
CONDENSER INLET SOLENOID (CIS) TEST
1. Attach a gauge manifold to the suction service valve and the discharge service valve. Attach another low pressure gauge to
the suction access port located in the suction line near the accumulator inlet. A low loss fitting must be used on the hose
connected to the suction access port.
2. Operate the unit in low speed cool.
3. Front seat the receiver tank outlet valve and allow the low side to pump down to 0 to 5 in. Hg vacuum (0 to -17 kPa).
4. Turn the unit Off.
5. Front seat the suction service valve to isolate the low side while it is still in a vacuum.
6. Watch the low pressure gauge attached to the suction access port. The low side pressure should not rise. If it does, there could
be a leak through the hot gas solenoid or the receiver tank pressure check valve (or both).
7. Use the Mechanics/Premium HMI Control Panel to enter the Interface Board Test Mode. Refer to the appropriate
Microprocessor Diagnostic Manual for specific information about the Interface Board Test Mode.
8. From the Interface Board Test Mode select Condenser Inlet Solenoid.
9. Energize the CIS with the Interface Board Test Mode.
10. Open the receiver tank outlet valve.
11. Watch the high side gauge attached to the discharge service valve. The high side pressure should not drop. If it does, the CIS
is not closing. Check the continuity of the wiring and the solenoid coil before assuming the solenoid is faulty.
12. Back seat the suction service valve and perform a “Refrigerant Gauge Removal” procedure.
For T-500R/T-Dairy - replace points 7 thru’ 9 above with the following: Use “Remote Watch” - Relay Test - Condenser Inlet
Solenoid (or jumper wires) to energize the CIS. Refer to the appropriate Microprocessor Diagnostic Manual for specific
information about “Remote Watch”.
If the CIS is stuck closed, the unit will stop very quickly after is starts to run and will record Alarm Code 10 (High Discharge
Pressure). Use the following procedure to check for a CIS that is stuck closed:
1. Connect a high pressure gauge to the discharge service valve to monitor the discharge pressure.
2. Start the unit in low speed cool while watching the discharge pressure.
• If the unit stops before the discharge pressure rises to the HPCO opening pressure (see “Specifications”), it is probably a
faulty HPCO.
• If the discharge pressure quickly rises to the HPCO opening pressure (see “Specifications”) before stopping, it is probably
a a plugged discharge strainer or the CIS is stuck closed. Go to the next step.
3. Start the unit in low speed heat while watching the discharge pressure.
• If the discharge pressure quickly rises to the HPCO opening pressure (see “Specifications”) before stopping, it is probably
a a plugged discharge strainer.
• If the discharge pressure is does not rise to the HPCO opening pressure (see “Specifications”) and stop the unit, the CIS is
probably stuck closed. Check the wiring to the CIS for a short circuit that is energizing the solenoid coil before assuming
the solenoid is faulty.
CONDENSER/RADIATOR COIL REPLACEMENT
Removal
1. Recover the refrigerant charge.
2. Remove the top cap/grille assembly.
3. Drain the engine coolant and disconnect the coolant hoses from the condenser/radiator coil.
4. Unsolder the hot gas inlet and liquid outlet refrigerant line connections.
IMPORTANT: Micro-channel coils are made of aluminum but have copper stub tubes at the inlet and outlet connections.
Make sure to use a heat sink on the copper stub tubes to prevent damage to the brazed connections (and the aluminum) that
attached the copper stub tubes to the aluminum micro-channel coil.
5. Unbolt and remove the condenser/radiator coil.