Principles of Operation of
the Module UCM-CLD
11RLC-SVU02F-E4
Low refrigerant temperature cutout
Both circuits are protected from a
saturated-evaporator refrigerant
temperature that goes below this
setting. The cutout Setpoint must be
at a minimum of 8°C lower than the
front panel or active chilled-water
setpoints. See Table 2 for proper
settings.
There must be a minimum of 8°C
between the cutout temperature
and active chilled-water setpoints.
The Clear Language Display will not
permit setting of the chilled-water
temperature less than 8°C above
this cutout temperature, and the
display will flash the last valid
temperature.
If the leaving-water temperature
cutout is set upward, the Clear
Language Display will maintain the
8°C minimum and will raise the
settings of the chilled-water
setpoints, if necessary.
If the chilled-water setpoints were
adjusted, the display will show the
following when the “Enter“ key is
pressed:
FRONT PANEL CHILLED WATER
SETPOINT HAS BEEN
INCREMENTED DUE TO CUTOUT
SETPOINT CHANGE
If the saturated-evaporator
refrigerant temperature for a circuit
drops below this Setpoint for longer
than 16°C-seconds, the circuit will
be shut down and a CMR diagnostic
will be displayed.
Table 2 – Leaving fluid temperature setpoints
°C °C °C % °C
5 1.5 -3.9 0 0
4 1 -4.4 10 -4
3 0 -5.4 13 -5
2-1 -6.416-7
1-2 -7.418-8
0-3 -8.420-9
-1 -4 -9.4 22 -10
-2 -5 -10.4 24 -11
-3 -6 -11.4 26 -13
-4 -7 -12.4 27 -13
-5 -8 -13.4 29 -15
-6 -9 -14.4 31 -16
-7 -10 -15.4 32 -17
-8 -11 -16.4 33 -18
-9 -12 -17.4 34 -19
-10 -13 -18.4 36 -20
-11 -14 -19.4 36 -20
-12 -15 -20.4 37 -21
Leaving
chilled-water
temperature
Leaving-water
temperature
cutout
Low refrigerant
temperature
cutout
Recommended
%EG
Solution
freeze
point
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