Principles of Operation of
the Module UCM-CLD
11
RLC-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
-6.4
16
-7
1
-2
-7.4
18
-8
0
-3
-8.4
20
-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
