Heatcraft Refrigeration Products H-IM-72A User Manual download pdf (Page 22)

Table 14. Oil Safety Switch

Pressure

Carlyle Danfoss Time Diff. Psi (bar)

Part No. Part No. Delay Cut-In Cut-Out Reset

634-2008

OR 60B2101

P529-2130 45 sec. 8 – 11 4 - 8 Manual

634-2050 (.55 - .76) (.28 - .55)

OR 60B2151

P529-2100

Pressure

Carlyle Johnson Time Diff. Psi (bar)

Part No. Part No. Delay Cut-In Cut-Out Reset

O6DA660115 P345 45 sec. 8 – 11 4 - 8 Manual

(.55 - .76) (.28 - .55)

Table 15. Part Load Performance Multipliers

Multiplication Factor Multiplication Factor

Compressor Model For 1 Bank Unloaded For 2 Bank Unloaded

Capacity Power EER Capacity Power EER

All 4 Cylinder Models .49 .57 .86 - - -

All 6 Cylinder Models .67 .73 .92 .32 .46 .70

Table 16. Required Differential Pressure

for Unloader Operation

Suction Pressure

∆P Required-Discharge Minus

Application Range PSI (Bar) Suction Pressure PSI (Bar)

O6D O6E

L.T. R-502, 404A, 507 10-25 (1.7-2.7) 30 (2.1) 30 (2.1)

M.T. R-502, 404A, 507 30-60 (3.1-5.2) 40 (2.8) 45 (3.1)

L.T. R-12, 134a 10-30 (1.7-3.1) 30 (2.1) 35 (2.4)

M.T. R-22 or H.T. R-22 30-90 (3.1-7.2) 50 (3.5) 55 (3.8)

Multiply compressor rating data by above factors when used with blocked suction unloading.

3-Phase Voltage Monitor

The microprocessor-based voltage and phase sensing circuit

constantly monitors the three phase voltages to detect

harmful power line conditions. When a harmful condition is

detected, the phase monitor output relay is deactivated after

a specified trip delay. The output relay reactivates after

power line conditions return to an acceptable level for a

specified amount of time (Restart Delay). The trip delay

prevents nuisance tripping due to rapidly fluctuating power

line conditions.

The Bicolor LED indicator light is green in normal conditions

and red during trip conditions. On initial start-up, if the light is

continuously red, the unit electrical phase may need to be

reversed. Each main power line should be checked for

proper voltage and imbalance prior to reversing a phase.

Also check the settings of the Voltage Monitor for proper field

conditions.

For semi-hermetic compressor units, two of the three power

monitor leads on the Voltage Monitor to L1, L2, and L3 may

need to be switched. For units with Scroll or Screw

compressors, which are rotation sensitive, two of the main

power lines to the compressor unit will have to be switched to

match the correct rotation of the compressors. The rotation

of Screw and Scroll compressors has been properly phased

in the manufacturing plant prior to shipping.

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Heatcraft Refrigeration Products H-IM-72A User Manual Page 22

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