Carrier 40VA003D7FAQEE Installations- Und Benutzerhandbuch Seite 28

Initial setting
a) If the DDC can provide 0–10 V mode and on/off signals to the Carrier AHU kit, the wired controller does not need to be connected. If only 0-10 V
signal but no on/off, the wired controller is necessary.
b) If the Carrier wired controller is connected to the system, the wired controller has top priority. Therefore, if the wired controller is set to off status,
signals from the DDC to the Carrier AHU kit will be invalid. When the wired controller is turned on, first adjust the operation mode, after which
the third-party AHU units can be controlled by the 0–10 V signal from the DDC to the Carrier AHU kit by adjusting the outdoor unit capacity.
c) If the wired controller is connected, the wired controller can directly control the third-party AHU fan motor. Else, the Carrier AHU kit PCB provides
a fan speed dry contact signal to the DDC or to the AHU unit PCB directly. If users want to use the wired controller to adjust fan speeds, set the
wired controller according to the AHU fan motor grades; a maximum of 3 fan speeds are available.
d) Carrier AHU kit can provide a mode signal to the DDC or AHU unit PCB directly to control the AHU unit, For example, if the DDC or third-party
AHU unit PCB receives a defrost signal from the AHU kit, the AHU fan motor will be controlled.
e) The maximum input range of voltage from the DDC is 0–10 V. If it exceeds 10 V, the input will be 10 V; if it is lower than 0 V, the input will be 0 V.
The maximum input voltage should not exceed 10 V.
• Plan C: Third party thermostat controls ON/Off by dry contract signal.
a) Carrier wired controller is necessary.
b) The wired controller has top priority. If the wired controller is off, signal information from the third-party thermostat to the AHU kit will be invalid.
c) In this control method, it is necessary to set the operation mode
d) In this control method, the AHU kit can also output a dry contact signal or strong electricity signal to control the AHU fan motors
e) The AHU kit can provide a mode signal to the DDC or AHU unit PCB directly to control the AHU unit. For example, if the DDC or AHU unit PCB
receives a defrost signal from the AHU kit, the AHU fan motor will be controlled.
• Plan D: The wire controller specially designed by Carrier is required.
a) The Carrier AHU kit controls the third-party AHU units such as the on/off, temperature settings, fan speed adjustment, and operation mode.
b) The Carrier AHU kit can provide a mode signal to the DDC or AHU unit PCB directly to control the third-party AHU fan motor. Either a dry contact
signal or strong electricity signal should be output.
Controlling AHU fan motor
Wired controller can be used to adjust the fan speeds.
Wired controller can realise a maximum of 3 fan speeds according to the AHU fan motor grades.
When the wired controller is set to 3 grades, high/medium/low fan speeds can be selected. The AHU kit PCB provides two types of
signals to the AHU fan motor:
a)Strong electricity type of high/medium/low fan speeds and fan motor stop signals.
b)Dry contact type of high/medium/low fan speeds and fan motor stop signals.
When the wired controller is set to 2 grades, high/low fan speeds can be selected. The AHU kit PCB provides two types of signals
to the AHU fan motor:
a)Strong electricity type of high/low fan speeds and fan motor stop signals.
b)Dry contact type of high/low fan speeds and fan motor stop signals.
When the wired controller is set to 1 grade, the air volume of the AHU units is uncontrollable. The AHU kit PCB provides only two
types of signals to the AHU fan motor:
a)Strong electricity of high fan speed and fan motor stop signals.
b)Dry contact of high fan speed and fan motor stop signals.
Dedicated wired controller
(Necessary)
Sensors
Communication
Liquid
Gas
Communication
Liquid
Gas
27
Third party thermostat
Field supply
rd
3 Party AHU (field supply)
Dedicated wired controller
(Necessary)
Remote controller
for VRF IDU
Sensors
rd
3 Party AHU
(field supply)