TM 9-4120-395-14&P
CHAPTER 3
OPERATOR MAINTENANCE
Section I. LUBRICATION INSTRUCTIONS
Para.
General ......................................................................................................................................................................... 3-1
3-1. GENERAL. This unit and Its major components are designed so that no lubrication Is required during their
serviceable lifetimes. The refrigerant compressor and its drive motor are hermetically sealed; sealed bearings are
incorporated in the drive motor, and the compressor crankcase contains a lifetime charge of oil. Sealed bearings are
also incorporated in the fan motors.
Section II. TROUBLESHOOTING PROCEDURES
Para.
Use of Table ................................................................................................................................................................. 3-2
Troubleshooting ............................................................................................................................................................ 3-3
3-2. USE OF TABLE. Table 3-1 contains operator troubleshooting information designed to be useful in diagnosing and
correcting common malfunctions which may develop.
a.
The table lists the common malfunctions which you may find during the operation or maintenance of this
unit and Its components. You should perform the tests/inspections and corrective actions in the order listed.
b.
This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective actions.
If a malfunction is not listed or is not corrected by listed corrective actions, notify your supervisor
3-3.
Table 3-1. Operator Troubleshooting
MALFUNCTION
TEST OR INSPECTIO N
CORRECTIVE ACTION
1.
UNIT DOES NOT START IN ANY MODE.
Check if power to the unit has been disconnected.
Connect power.
2.
UNIT STARTS BUT DOES NOT COOL.
Step 1. Check that thermostat is set at proper temperature. See Figure 2-1.
Set thermostat to proper temperature.
Step 2. Check system switch setting. See Figure 2-1.
Set system switch to COOL.
Step 3. If system does not cool, contact unit maintenance.
3-1
