Koolgas Relay
To assure proper operation of
the rack, it is required that a
compressor be running when a
branch goes into Koolgas
Defrost. The Koolgas Relay
contacts are wired between T 9
and T10 of the #1 Compressor
Board only. When any Koolgas
Branch Board calls for defrost,
the Koolgas contacts close
forcing #1 Compressor run.
Koolgas Relay with EPC
With an EPC Control, the Koolgas acts as
an interface between the 120V C o n t r o l
Panel and the low Voltage EPC circuit
boards.
DO NOT CROSS VOLTAGES.
Interlock Relay
On Compound Systems, at least one high
side compressor must be running when a
booster compressor comes on. The first
high side compressor is designated for this
function. If compounding is between racks
this will be the #1 Compressor. On a com-
pound rack the first high side compressor
will be forced on if no others are running.
The schematic shows a six compressor
rack with the #4 Compressor being the
first high side unit.
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 • Printed in USA
Revised August 1, 1996 P/N 340272A
4 - 17
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