domat UC905
08/2018 Subject to technical changes.
1
UC905
Room unit for controller FCR015
Summary
The UC905 room unit is a communicative human-machine interface for VAV unit
controller FCR015.
According to production type, each version of the unit may contain display, backlight
and knob.
UC0905
–
basic version with display and knob
UC905BL
–
version with display, knob and backlight
UC905DK
–
version without knob and display
The UC905 is successor of UC095 room unit and can be used with controllers
FC015 and FCR015. Beware of unit terminals connection. It differs from its
predecessor.
Application
▪
VAV systems
–
measurement and control of room temperature and CO
2
concentration.
Function
The unit reads room temperature, humidity and CO
2
concetration in the room air,
temperature correction / setpoint by a knob, and required operation mode which is set
by a short push or in the menu. Data is transmitted to the room controller. The main
controller, FCR015, may send to the unit other data (heating / cooling mode, fan stage,
day / night / standby mode etc.) which are displayed on the LCD display.
Connect the room unit to FCR015 over a 4 core cable, the most suitable types are JY(St)Y
or LAM 2x2x0.8. Use the same type which powers the FCR015 controller as if the room
unit power is taken from the FCR015 terminals, the cores in a terminal should be of the
same cross-section.
If there is communication failure between UC905 and FCR015, there is a wrench and
alarm bell icon at the UC905 display. Check signal polarity (terminals 8, 9), bus
termination, and correct wiring at the FCR015 side (see FCR015 data sheet).
Technical data
Power supply
24 V AC +/- 20%
Consumption
3 W
Galvanic isolation
1 kV
