Specifications

Figure 19, Unit Control Panel
Capacity Control System
The capacity of the chiller is controlled by:
1) Staging the compressors on and off;
2) By adjusting the capacity of each compressor by opening or closing the inlet vanes to control the
quantity of refrigerant entering the impeller; and,
3) Varying compressor speed to change capacity.
Unit Controller
Circuit # 1 Controller
Circuit # 2 Controller
Ground MOD1, MOD2
SW1, Unit Switch
SW12, Circ #1 Switch
SW22, Circ #2 Switch
Control Circuit Breaker
Unit Terminal Board
UTB1
Circuit #1 Terminal
Board, TB1
Circuit #2 Terminal
Board, TB2