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17
FREE-COOLING
(CONT’D)
The thermostat is incremented by one stage if TEEG remains greater than CONSREG+0.5°C for over 3
minutes. As long as this condition on TEEG is satisfied, THERFC continues to be incremented by one stage
every 3 minutes.
If TEEG remains lower than (CONSREG-0.5°C) the free-cooling thermostat is reduced by one stage every 3
minutes.
When TEEGFC falls below the set point, all ventilation stages are halted.
If the compressor regulation thermostat THER requires at least one stage of regulation whilst free-cooling is in
service, the free-cooling thermostat is forced to its maximum.
The free-cooling fan n VENTFCn operates if:
. THERFC ≥ n
and . V3VFC is in service.
F Authorisation of compressor start-up
Authorisation of compressor start-up, in parallel with free-cooling operation, is defined by the variable AUTOCP
which is dependent on the following parameters :
V3VFC ó Three-way free-cooling valve
THERFC ó Free-cooling regulation thermostat
THER ó Compressor regulation thermostat
AUTOCP is set to 1 if :
. THERFC is at its maximum and TEEG is greater than CONSREG for over 3 minutes
or . V3VFC is not fed.
AUTOCP is kept at 1 as long as :
. THER is strictly positive
or . V3VFC is not fed.
TEEGFC
TEEG
temps
CONSREG
CONSREG+0,5°C
CONSREG-0,5°C
TEEG / TEEGFC
3 min
3 min 3 min
0
0
1
2
2
1
0
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