Industrial Refrigeration Compressor Index Page


Carrier 06D, 06E Unloader Operations
5-Year Warranty Available

Capacity Control Valve

Control Set Point (cylinder load point) is adjustable from zero to 85 psig.  Pressure Differential between cylinder load-up point and cylinder upload point is adjustable from 6 to 22 psig.

To Regulate Set Point -- Refer to control value diagram, right.  Turn adjustment nut clockwise to its bottom stop (with nut in this position, set point is 85 psig).  Control set point is then regulated to desired pressure by turning adjustment nut counterclockwise; every full turn decreasing set point by 7.5 psig.  (Approximately 11-1/2 turns in counterclockwise direction will decrease control set point to zero psig).  Capacity Control table shows steps of control for the compressor and condensing unit.

Pressure Differential Adjustment -- Turn differential adjusting screw in counterclockwise direction to its back stop position (differential in this position 6 psig).  Pressure differential is set by turning adjustment screw clockwise; every full turn increasing differential by 1.5 psig.  (Approximately 10 turns in clockwise direction will increase pressure differential to 22 psig.)

*When electric solenoid unloader is energized, the compressor cylinder bank unloads; when solenoid unloader is de-energized the cylinder bank loads up.

CAPACITY CONTROL REDUCTION STEPS
Compressor Unit Steps
  1 2 3
Cond. Unit No. Cyl % Cap. % KW No. Cyl % Cap. % KW No. Cyl % Cap. % KW
06DE 824, 337, 537 6 100 100 4 66-2/3 76 2 33-1/3 48
07DB 210,112, 215 6 100 100 4 66-2/3 76 2 33-1/3 48




LOADED



UNLOADED



SUCTION CUT-OFF UNLOADED OPERATION



SUCTION CUT-OFF LOADED OPERATION