Minimum cooler flow — The minimum cooler flow
(maximum cooler temperature rise) for standard units is
shown in Minimum Cooler and Condenser Flow Rates and
Minimum Loop Volume table below. When gpm (L/s) required
is lower (or rise is higher), follow recommendations
below:
a. Multiple smaller chillers may be applied in series,
each providing a portion of the design temperature
rise.
b. Chilled fluid may be recirculated to raise flow rate.
However, the mixed temperature entering the cooler
must be maintained at a minimum of at least 5° F
(2.8° C) above the leaving chilled fluid temperature.
c. On 30HK,HL units, special baffling is required to
allow minimum flow rate to be reduced to 12%.
NOTE: Recirculation flow is shown below.
Loss-of-flow protection — Loss-of-flow protection is
provided by monitoring the required accessory proof-offlow
switch.
Ground current safety — This sensor opens when a
current-to-ground condition greater than 2.5 ± 2 amps is
sensed in the compressor windings (accessory ground current
sensor required).
По старой доброй традиции линеек керриеровских контроллеров все почти понятно. Либо ток либо проток
Форум 
