CIAT AirCompact Control, Control Manual

Page: 16 / 69

16

When the temperature drops, the controller will calculate the heat requirement needed to keep this temperature constant.
This gradually adjusts the output of the 2 heating coils (via a 3-way valve for coil 1, via a triac or using 1 or 2 stages in the
case of an electric heater) or a "Mixed" type in heating mode (authorised by the water network temperature sensor for coil 2
only).
The order in which the various heat generators are activated can be configured.
Coils available to meet the heating requirements
Heating coil Mixed water coil Electric heater

By increasing the regulated temperature, the controller will calculate the exact cooling requirement.
If conditions permit, it will authorise Free Cooling then gradually adjust the output of the cooling coil (via a three-way valve),
"Mixed" type in cooling mode (authorised by the water network temperature sensor for coil 2 only) or DX type (direct
expansion) and will request that the condensation unit starts up when the level of demand from the coil reaches 66%
(adjustable) and that it stops when the demand is 33% (adjustable).
If Free Cooling is disabled, the requirement will be taken over by the coil.
The distribution of the requirement between the Free Cooling and the coil is adjustable.
BM
Y
B
A
B
A
T°C
S
BC BC
B
A
B
A
Y
Heating requirement (%)
50 100
0
Cooling requirement (%)
50 100
0
Cooling requirement (%)
50 100
0
C
onde
ns
a
ti
o
n
uni
t f
or
t
he
D
X
co
il
66%