X
4
SUPPLY AIR
TEMP
. SENSOR CONFIGURATION
X4 is an auxiliary sensor input mainly intended for supply air measurement as
feedback on the performance of the air conditioning supply air output, but currently
performs no other function (In future updates this sensor could be used for room to
supply air cascade control or supply air min / max limitation). This sensor reading is
also available in the modbus output for zone display information on the Hevac HMI
panel or for use by 3rd party BMS suppliers. The input can be set as either a Passive
(Hevac type -D sensors) or as Active type (0-10vdc) in software but must also be
selected as a passive or active type in hardware with a small jumper (CN2-2) on
the bottom circuit board to match the software setting. Offset (cal) adjustment is
settable for both passive & active types & for active sensors the maximum
range is also adjustment ie: 10v = 20 ~ 100c
LAST SET STATE DISPLAYED
Note if active sensor type is selected, it is also necessary to reposition a physical input
select jumper on the controller's bottom pcb. Remove screws holding the lid to base and
hinge lid to the right, locate the row of red jumpers located under the X1-X7 terminal strip.
Reposition the CN2-2 jumper (4th of 7 jumpers from left) to short the top two pins
(V position) for active sensor selection. The bottom two pins (T position) are used for
passive resistance type sensors selection (factory default)... SEE IMAGE ABOVE.
For active sensors also note 0v equates to 0c unless offset by the software offset setting...
(=)
HEVAC CONTROL AGENCIES PTY LTD. 7/54 HOWLEYS RD.
NOTTINGHILL, VIC. 95627888
www.hevac.com.au
21/10/19
TO USE ACTIVE SENSORS INSTEAD OF
PASSIVE , MOVE JUMPERS AS INDICATED.
MODBUS ( TERMINALS X5 & X6) ARE
FACTORY SET TO COMMS MODE "C"
USING THE CN3-1 & 2 JUMPERS. ALSO
IF X7 ISNT BEING USED AS A CO2 SENSOR
INPUT, MOVE CN3-3 TO THE C POSITION &
USE X7 FOR CABLE SHIELD CONNECTION.
19/2
8
CONTROLLER BOTTOM PCB SHOWING SENSOR PASSIVE / ACTIVE
RED
SELECTION PINS
CN1-1 :X1 MAIN SENSOR
CN1-2 :X2
REMOTE
SETPOINT
CN2-1 : X3 O/A SENSOR
CN2-2 :X4 AUX. SENSOR
CN3-1 : X5 MODBUS A
CN3-2 : X6 MODBUS B
CN3-3 : X7 CO2 SENSOR
OR
MODBUS SHIELD
