V2.2
-00
17
FREE-COOLING
(CONT’D)
The thermostat is incremented by one stage if TEEG remains greater than 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
0,5°C
CONSREG-0,5°C
TEEG / TEEGFC
3 min
3 min
3 min
THERFC
0
0
1
2
2
1
0
Summary of Contents for CLIMATIC II
Page 1: ...CLIMATIC USER MANUAL CHILLERS V 2 2...
Page 93: ...V2 2 00 92...
