Section 5.0 – Sensors, Controls and Relays
Drain Relay (K1)
Opens the drain valve according to drain controls.
Suction Relay (K2)
Turns on according to the mode and dew point
conditions and opens the suction or liquid line
valve
when
opened.
Unloader Relay (K3)
Turns on according to the modes and dew point
and opens the unloader valve when active.
Compressor Relay (K4)
Controls the compressor according to the mode
and
dew
point
conditions.
High Dew Point Relay (K5)
Relay and LED alarm turns on when the dew
point is 15ºF above the set point. This is also
active
during
any
error
conditions.
Compressor Unloader #1 Relay (CU1) (FU Panel Only)
Turns on when the dew point is below the set
point +2ºF and turns off when the dew point is
above
the
set
point
+2ºF.
Compressor Unloader #1 Relay (CU2) (FU Panel Only)
Turns on when the dew point is below the set
point +4ºF and turns off when the dew point
is above the set point +4ºF.
Dew point Sensor (Probe 1)
Resistive NTC sensor for measuring dew point
temperature.
Suction Temperature Sensor (Probe 2)
Resistive
NTC
sensor
for
measuring
external
suction
temperature
at
the
expansion
bulb
(E3 Probe)
Summary of Contents for CT3000
Page 21: ...Section 11 0 MAINTENANCE CHARTS cont Element Replacement Log Part No Date Initials ...
Page 22: ...Section 12 0 ASSOCIATED DRAWINGS ...
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