TK 56701-1-IM-EN
87
System Leak Check Procedures
Set-up Unit
Place microprocessor in Evacuation Mode to leak check, evacuate and charge unit. With the SPECTRUM
microprocessor in the evacuation mode all solenoid valves in the refrigeration system are open. This allows the
refrigeration system to be properly evacuated.
N
No
otte
e:: Refer to appropriate Operation & Diagnosis Manual for complete information about the microprocessor.
Use the following procedure to place the SPECTRUM microprocessor in the Evacuation Mode:
a. Connect unit battery and attach a battery charger to the battery. The battery must be capable of at least 20
amperes output. This will maintain the charge level of the battery during the time required to leak check,
evacuate and charge the unit.
b. Turn the unit on. (DO NOT allow the diesel engine or electric motor to start).
c. From the main screen on the HMI, enter the Menu screen by pushing MENU.
d. At the first Operator Menu screen that appears; either the Language Display or the Alarms Display, press and
hold the unlabeled soft key and the EXIT key for 5 seconds.
e. The Maintenance Hourmeter Menu will appear. Press the NEXT key as required to show the Evacuation Mode
Menu.
f.
When the Evacuation Mode Menu is shown press the SELECT key.
g. The unit will stay in Evacuation Mode until the battery voltage falls below a minimum voltage or the EXIT key is
pressed.
Leak Check the System
N
No
otte
e:: Refer to Diagnosing Thermo King Refrigeration Systems (TK-5984-10) for leak detection procedures.
Refer to the illustration below.
1. Connect leak test gas (R-404A) supply to center hose of gauge manifold.
2. Attach gauge manifold hoses to the suction service valve and the discharge service port.
3. Pressurize the system with leak test gas. If desired, system pressure may be boosted using nitrogen gas.
4. Check connections made during installation for leaks using electronic leak detector and or soap bubbles.
5. Recover test gas to repair leaks. System must be vented while repairing solder joint leaks. Pressurize the system and
check again after a leak has been repaired.
6. If no leaks are found recover test gas to 0 psig.
