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SET POINT THERMOSTAT FUNCTION DESCRIPTION
MAIN DISPLAY
Visualizes:
Inlet water temperature
Active alarms
See page 7, for adjustment of set point of the system.
The water temperature is thermostatically controlled via a set point and a tolerance range (differential).
The operation of these parameters is shown in the following diagram:
COOLING OPERATING MODE
Compressor
Compressor
OFF
c03
Set point
Set point + Differential
UNITS WITH 1 COMPRESSOR
Operation with one compressor is as shown in the diagram taking into account that the temperature about which
the controller takes over is the inlet water temperature. When this temperature exceeds the set point + tolerance
range (differential) the compressor starts to produce cool water. When inlet water temperature gets below the set
point the compressor stops. For example, when the set point = 11ºC and differential = 2ºC, the compressor stops
when inlet water temperature is 11ºC and starts when this temperature exceeds 13ºC.
HEATING OPERATING MODE
Compressor
Compressor
ON
c04
ºC
Set point -Differential
Set point
UNITS WITH 1 COMPRESSOR
Operation with one compressor is as shown in the diagram taking into account that the temperature about which
the controller takes over is also the inlet water temperature. When this temperature gets below the set point -
Differential, the compressor starts to produce heat water. When the inlet water temperature exceeds the set point,
the compressor stops. For example: when the set point = 41ºC and differential = 2ºC, the compressor stops when
the inlet water temperature is 41ºC and starts when this temperature gets below 39ºC.
NOTE: The units with 3 compressors and the Low ambient temperature kit work with 2 steps according to the units
with 2 compressors.
AFFECTED PARAMETERS
Code that
appears on the
display
Cooling set point
Heating set point
Cooling differential temperature
Heating differential temperature
Differential for second compressor
LEVEL 1
SET POINT
Step 1
ON
c03
ºC
c05
Set point
UNITS WITH 2 COMPRESSORS
Step 2
OFF
c04
UNITS WITH 2 COMPRESSORS
DESCRIPTION
Cooling set point
Heating set point
Step 2
c03
ºC
Step 1
c04
ºC
c05
Set point
MAX: Maximum value for the parameter.
MIN: Minimum value for the parameter.
DEF: The default value, factory set.
1
COMPRESSOR
COMPRESSOR
UNIT VALUES
UNIT VALUES
MIN
MAX
DEF
MIN
10
15
11
9
41
20
20
43
0
0
2
25,5
0
25,5
0
2
---
---
---
0
9
LEVEL 2
Step 1
Step 2
c03
c03
c05
c05
Set point
UNITS WITH 3 COMPRESSORS
Step 3
Step 2
2xc04
c04
c05
UNITS WITH 3 COMPRESSORS
UNIT: The units of measure used.
VAR.: Minimum variation allowed.
2
3
COMPRESSOR
UNIT VALUES
MAX
DEF
MIN
MAX
10
14
8
14
43
20
43
42
0
1.5
25,5
25,5
0
25,5
1.5
25,5
25,5
25,5
1.5
0
LEVEL 3
Set point value
Set point value
Step 3
2xc03
ºC
Step 1
c04
ºC
c05
Set point
DEF
UNIT
VAR.
0,1
ºC
9
43
0,1
ºC
1
0,1
ºC
1
0,1
ºC
1
0,1
ºC
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