Heatcraft Refrigeration Products 25000102 operation manual Part Load Performance Multipliers

									Installation and Operations Manual
Table 14. Oil Safety Switch
Carlyle	Danfoss			Time			Pressure
							Diff. Psi (bar)				Reset
Part No.	Part No.			Delay
							Cut-In		Cut-Out
634-2008
OR	60B2101
P529-2130				45 sec.			8 – 11	4 - 8			Manual
634-2050						(.55 - .76)		(.28 - .55)
OR	60B2151
P529-2100
Carlyle	Johnson			Time			Pressure
							Diff. Psi (bar)				Reset
Part No.	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					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)			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 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