Phase Voltage Monitor | Heatcraft Refrigeration Products 25000102

Installation and Operations Manual

Table 14. Oil Safety Switch

Carlyle

Danfoss

Time

Pressure

Diff. Psi (bar)

Reset

Part No.

Delay

Cut-In

Cut-Out

634-2008

60B2101

P529-2130

45 sec.

8 – 11

4 - 8

Manual

634-2050

(.55 - .76)

(.28 - .55)

60B2151

P529-2100

Carlyle

Johnson

Time

Pressure

Diff. Psi (bar)

Reset

Part No.

Delay

Cut-In

Cut-Out

O6DA660115

P345

45 sec.

8 – 11

4 - 8

Manual

(.55 - .76)

(.28 - .55)

Table 15. Part Load Performance Multipliers

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

Suction Pressure Psi (bar)

Range Psi (bar)

O6D

O6E

L.T. R-502, 404A, 507

10-25

(1.7-2.7)

(2.1)

M.T. R-502, 404A, 507

30-60

(3.1-5.2)

(2.8)

(3.1)

L.T. R-12, 134A

10-30

(1.7-3.1)

(2.1)

(2.4)

M.T. R-22 or H.T. R-22

30-90

(3.1-7.2)

(3.5)

(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 condition.

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.

22	Part # 25000102