Ventair CU24V1, Operation Instruction Manual

Page: 15 / 24

15
4.2.9 R
ECIRCULATION DAMPERS CONTROL
(
MIXING CHAMBER
)
After setting the type of recovery (MENU page #10), you can define at page #23 the damper control by
setting the parameter DAMP:
•
Auto – damper control as a function of outdoor temperature according to the curve defined at
MENU pages #24 and #25
•
OFF, 10%, 20%, .... 100% - manual control of the dampers
Name Default value Range Description
DAMP OFF
OFF,
10%,20%,…100%,
AUTO
Type of damper control
ODT1 0

C - 25 ÷ 30

C Outdoor temperature low range value.
ODT2 0

C - 25 ÷ 30

C Outdoor temperature high range value.
DACO1 0 % 0 ÷ 100 % Damper control low range value
DACO2 0 % 0 ÷ 100 % Damper control high range value
4.2.10 B
Y
-
PASS AND EARTH EXCHANGER SETTINGS
(
NOT A STANDARD
)
•
AUTO : Bypass is controlled depending on the outdoor and the outlet/indoor temperatures.
•
ON : Switch on Bypass
•
OFF : Switch off Bypass
4.2.11 F
AN PARAMETERS
•
FCOEF : Programming separate speeds of the air supply and air exhaust fans
It is possible to set separate speeds for both air supply and air exhaust fans. The FCOEF
parameter defines the dependency between the fan speeds according to the following
formula:
Air exhaust fan speed = air supply fan speed x FCOEF
•
START: Delayed start - After the system switched on, the shut-off dampers open, the fans start
only after the set interval has elapsed.
•
STOP : Delayed stop - After the system switched off, all devices will switch off while the fans
continue to run for the time specified by the STOP parameter. For air handling units with
electric heaters, it is necessary to set a delayed switch-off of the fans always to ensure
sufficient cooling of the heater.
•
FMOD : This mode disables / enables the supply fan safety modulation function. The FMOD
parameter determines the temperature behind the heat recovery heat exchanger on the
extract air duct. If the FMOD parameter is OFF, the supply fan is not modulated in this mode.
If the extract air temperature behind the recuperator falls below the FMOD value, the system
reduces the supply fan speed as required up to the value given by the FMIN parameter.
•
FMIN : Minimum fan speed on the supply air duct. The speed of the supply fan is modulated in
order to protect the heat exchanger against freezing. The FMIN parameter determines the
minimum speed of the supply fan during modulation.