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

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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.