Marvair AVP 24 Manuel télécharger pdf (Page 34)

ComPac 6/09-18

NOTE: Feel the top of the compressor to see if it has overheated. If it is hot, the internal overload

may be open. You may have to wait several hours for it to reset.

3. Motor Winding Resistances: Using a digital volt-ohm meter (VOM), measure the resistance

across the compressor windings as shown below.

Resistance can be measured as shown above. Any deviation from above values could indicate a

defective compressor.

4. High Voltage/Insulation Test: Test internal leakage with a megohmeter. Attach one lead to the

compressor case on a bare metal tube and to each compressor terminal to test the motor windings.

A short circuit at high voltages indicates a motor defect. Do not do this test under vacuum.

5. On single phase models, check the capacitor by substitution.

4.4 ConTrol boarD DiaGnosis

The control board (see section 1.6a for a complete description of the control board) has a red diagnostic

LED which indicates the lockout fault. The control board will enter into and indicate lockout if either

of the fault conditions (LPS or HPS) occur twice.

The contactor must be closed before the rst fault condition can be recognized by the control board.

The contactor will be closed 3 minutes after the unit is energized and only if cooling is required. The

rst fault condition will open the contactor and shutdown the unit. The contactor on the unit that has

the fault condition must be closed before the second fault condition can be recognized by the control

board. The contactor on the unit with the fault condition will close after 3 minutes if the unit is still

calling for cooling and if the fault condition no longer exists. If you get a second fault condition, the

contactor will open and shutdown the unit. The “red” led will have one blink if the high pressure switch

has opened twice and will have two blinks if the low pressure switch has opened twice. The unit must

be in the cooling mode (compressor contactor Closed) before a fault condition can occur.

SINGLE

PHASE

> R

= R

+ R

THREE

PHASE

= R

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Marvair AVP 24 Manuel Page 34