Carel k.Air, Руководство пользователя, Страница: 50 / 192

50
Functions
k.air +030220981 rel. 1.2 - 01.12.2020
F resh air damper Mixing damper C ontrol
Modulating On/off or absent Fresh air damper opens to the maximum (settable limit) when the unit is ON
If there is no mixing damper, the fresh air damper goes into freecooling (main temperature
control) or air quality control mode, or both.
When frost prevention is active, the fresh air damper progressively closes, while the mixing
damper remains closed
If frost protection is active, the fresh air damper closes and, if the mixing damper is fi tted, the
unit enters recirculation mode, with the fans on
On/off Modulating Fresh air damper opens when the unit is ON and the mixing damper opens to the minimum
(settable limit)
Mixing damper goes into freecooling or air quality control mode, or both.
When frost prevention is active, the mixing damper progressively closes.
If frost protection is active, the fresh air damper closes and the mixing damper opens to the
maximum (settable limit)
Modulating Modulating Fresh air and mixing dampers, in sync, go into freecooling (main temperature control) or air
quality control mode, or both.
When frost prevention is active, the fresh air damper progressively closes, while the mixing
damper progressively opens.
If frost protection is active, the fresh air damper closes and the mixing damper opens.
Tab. 9.a
R if D escription D ev Min Max UoM D ir Modbus BAC net
DA M P E RS
Ca01 Damper opening time 120 0 65535 s R/W HR1639 PIV3134
Ca03 Enable air quality regulation for fresh air OR mixing damper FALSE 0 1 - R/W CS289 BV289
Air Quality - Dampers PID parameters - Proportional gain 1.0 0.0 999.9 - R/W HR1640 AV3135
Air Quality - Dampers PID parameters - Integral time 60 0 999 - R/W HR1641 PIV3136
Ca06 Fresh air damper - Minimum regulation value 0.0 0.0 100.0 % R/W HR1642 AV3137
Fresh air damper - Maximum regulation value 100.0 0.0 100.0 % R/W HR1643 AV3138
Ca09 Mixing air damper - Minimum regulation value 0.0 0.0 100.0 % R/W HR1644 AV3139
Mixing air damper - Maximum regulation value 100.0 0.0 100.0 % R/W HR1645 AV3140
Ca12 Enable dampers regulation in case of FreeCooling/FreeHeating FALSE 0 1 - R/W CS290 BV290
Tab. 9.b
9.1.3 B ypass damper
Operation of the bypass damper depends greatly on whether a cross- fl ow heat recovery unit is fi tted. This may be on/off or
modulating, and has the purpose of allowing freecooling and, for modulating dampers, limiting heat recovery capacity for pre-
cise air temperature control.
Below is a summary of the functions available based on the type of damper
B ypass damper C ontrol
On/off The damper is activated by checking the outside air and return/room temperature conditions
Modulating The damper is only controlled after checking the outside air and return/room temperature conditions
Modulation is managed by the main temperature control function
Tab. 9.c
R if D escription D ev Min Max UoM D ir Modbus BAC net
HE A T R E CO VE RY
E001 Heat recovery delta for bypass damper in cooling mode 4.0 -99.9 99.9 K R/W HR1458 AV2966
Heat recovery delta for bypass damper in heating mode 4.0 -99.9 99.9 K R/W HR1459 AV2967
Tab. 9.d
Note:
when the unit is Off , the bypass damper will be open.
9.2 A ctivation
The k.air software enables the unit to be switched on only if all of the enabled commands are set to ON (from pGDE/thTune, BMS,
digital input, scheduler). When the unit is switched on, a procedure is activated to verify all of the safety conditions and activate
the devices following a certain sequence; the dampers are opened 100% and the unit will complete the warm-up procedure,
if enabled, before switching to steady state operation, in the active control mode.