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Operation
51RT-SVX20A-E4
To check the damper is functioning
correctly, the ECA is equipped with
an indicator light in the middle of
the board. This light operates as in
Table 42.
Table 47 - ECA board LED
While setting the minimum position
the damper may move towards the
new setting in several small steps.
Once the damper has remained in
the same position for 10 to 15
seconds it can be assumed it is in
the new position.
OFF: No Power or Failure
ON: Normal, OK to Economize
Slow Flash:
Normal, Not OK to
Economize
Fast Flash: Communications Failure
Pulse Flash: Error Code
1 Flash: Actuator Fault
2 Flashes: CO
2 Sensor
3 Flashes: RA Humidity Sensor
4 Flashes: RA Temp Sensor
5 Flashes: OA Quality Sensor
6 Flashes: OA Humidity Sensor
7 Flashes: OA Temp Sensor
8 Flashes: MA Temp Sensor
9 Flashes: RAM Fault
10 Flashes: ROM Fault
11 Flashes: EEPROM Fault
Figure 31 - Minimum fresh air adjustment
1 = ECA board
1234
1
1
2
1
1
2
1
1
2
1
1
2
1
1
2
1
1
2
1
1
2
EXF
EXF
MAT
MAT
OAH/
OAH/
OAE
OAE
OAT
OAT
RAT
RAT
RAH/
RAH/
RAE
RAE
DCV
DCV
2-10 VDC
2-10 VDC
FEEDBACK
FEEDBACK
INPUT
INPUT
+
+
-
+
+
-
2-10 VDC
2-10 VDC
CONTROL
CONTROL
OUTPUT
OUTPUT
MIN POS.
MIN POS.
SETPOINT
SETPOINT
0-50%
0-50%
ABCD
ABCD
SETTINGS
SETTINGS
CO2 "PURGE"
CO2 "PURGE"
SETPOINT
SETPOINT
ADJUSTMENT
ADJUSTMENT
500-1500 PPM
500-1500 PPM
GREEN
GREEN
LED
LED
POWER EXHAUST
POWER EXHAUST
CONTACTS
CONTACTS
MIXED AIR SENSOR INPUT
MIXED AIR SENSOR INPUT
COMMON
COMMON
COMMON
COMMON
OHS INPUT
OHS INPUT
NOT USED-OAT IS
NOT USED-OAT IS
CONNECTED TO RTRM
CONNECTED TO RTRM
RA INPUT
RA INPUT
COMMON
COMMON
COMMON
COMMON
RHS INPUT
RHS INPUT
CO2 SENSOR INPUT
CO2 SENSOR INPUT
COMMON
COMMON
P
P1
P1
REMOTE
REMOTE
MINIMUM
MINIMUM
POTENTIOMETER
POTENTIOMETER
SHORTED=CLOSED
SHORTED=CLOSED
OPEN=ON BOARD POT.
OPEN=ON BOARD POT.
270 omega = 50%
270 omega = 50%
WHT
WHT
RED
RED
BLUE
BLUE
MODBUS
MODBUS
-
+
COMMON
COMMON
24VAC
24VAC
+
1