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Figure 5
– Thermostat Control Settings
5.1.3.3
Pumps
The UC can manages one or two water pumps for both evaporator and condenser. Number of pumps and their priority can
be set from the menu in 4.2.4.
The following options are available to control the pump(s):
#1 Only
Set to this in case of single pump or twin pump with only #1 operational (f.e. in case of maintenance on #2)
#2 Only
Set to this in case of twin pump with only #2 operational (f.e. in case of maintenance on #1)
Auto
Set for automatic pump start management. At each chiller start, the pump with the least number of hours will be activated.
#1 Primary
Set to this in case of twin pump with #1 running and #2 as a backup
#2 Primary
Set to this in case of twin pump with #2 running and #1 as a backup
Power Conservation
5.1.4.1
Demand Limit
Demand limit function allows the unit to be limited to a specified maximum load. Capacity limit level is defined with an
external 4-20 mA signal and linear relationship. 4 mA indicate maximum capacity available whereas 20 mA indicates
minimum capacity available.
With demand limit function is not possible shutdown the unit but only unload it until minimum admissible capacity. Demand
limit related setpoints available through this menu are listed in the table below.
Thermostat Control ON
Thermostat
Control OFF
Capacity load up
Capacity Unload
AS
AS+SU
AS-SD
Thermostat Control OFF
C
o
n
tr
o
ll
e
d
T
em
p
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rat
u
re
DB
COOL MODE
Thermostat Control ON
Thermostat
Control
OFF
AS
AS+SD
AS-SU
Thermostat Control OFF
Capacity Unload
Capacity load up
C
o
n
tr
o
ll
e
d
T
em
p
e
rat
u
re
DB
HEAT MODE
