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What are the HEATCRAFT LNE Condenser settings for the P352P?

Issue:
What are the HEATCRAFT LNE Condenser settings for the P352P?
 
Product line:
Condensers
 
Environment:
Data Center Cooling
 
Cause:
 
Resolution:
The Johnson Controls P352PN Series pressure control is used to generate two standard analog output signals (0 to 10 VDC and 4 to 20 mA).  We use 0-10vDC.

Setpoint Potentiometer: 220 psig. Condenser Head Pressure Control

Minimum Output Potentiometer of the Pressure transducer: 0%. The minimum output potentiometer controls the minimum signal sent to the motor. It is adjustable from 0-100%. If this is adjusted to 60%, the motor will allways run at 60% minimum. The motor will ramp up to 100% as needed but will always run at at least 60%. It is recommended to leave this at 0%.

Throttling range of the pressure transducer controller: 100 psig. The throttling range potentiometer controls how far the system pressure must deviate from the control set point to generate a 100% output signal from the control. It is adjustable from 10-100 psig. To maximize sound reduction and energy savings and to provide the most stable control, it is recommended this setting be left at 100 psig.

Integration Dip Switch: 4 on ; 1,2,3 off The integration constant switch provides ability to change controller from a proportional only control to a proportional plus integral control. To provide the most responsive system to maintain a stable head pressure, it is recommended this setting be left on “fast,” which is 4 on, 1, 2, 3 off.

J1 Jumper Position integration Dip Switch: Direct Acting (DA) mode. The reverse acting/direct acting jumper is used to ensure the controller responds correctly to maintain desired head pressure. In DA mode, the motor speed increases as the pressure rises above desired set point. For proper condenser operation, this jumper MUST be in DA mode. Failure to ensure J1 jumper is in direct acting mode will cause the system to trip on high head pressure.







All information is pulled from document 2000 Johnson Controls, Inc. 1 — Part No. 24-7664-1911, Rev. — www.johnsoncontrols.com — Code No. LIT-930044
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