Ingersoll-Rand ReliaTel, Manual, Page: 126 / 176

126 RT-SVD03L-EN
Economizer
ReliaTel ™ ™
Economizer Module Layout
N No otte e:: Honeywell (obsolete - not available to order).
The economizer module plugs directly onto the
actuator. It has a diagnostic LED, which under normal
operation is either ON (OK to economize) or FLASHING
(Not OK to economize). It communicates via MODBUS
with the RTRM, and receives outside air temperature
input from the RTRM. Mixed air sensor (MAS), return
air sensor (RAT), outdoor humidity sensor (OHS), and
return humidity sensor (RHS) are all plugged directly
into the ECA. The application section of this manual
shows how to apply a CO
2
sensor.
A new stripped down version of the ECA module was
implemented in April, 2005 which only contains the
MAT, input, min. pos. adjustment and the wire plug for
power and ModBus communications. This module will
only be applied on units that are supplied from the
factory without any economizer options such as,
reference enthalpy, comparative enthalpy or CO
2
.
Options installed in the field will require the "full-up"
version in order to operate properly.
• To read the actual damper position, read the DC
voltage at the ’2-10 vdc feedback input’ terminals. 2
vdc is closed, 10 vdc is 100% open.
• To drive 2 actuators with 1 control, connect field
wiring as shown in
Figure 75, p. 126 .
N No otte e:: Remote minimum position input does not
work when a CCP is controlling the unit.
Figure 75. ReliaTel ™ ™ economizer module layout (Honeywell)
Min Pos.
Setpoint
0-50%
Power Exhaust
Contacts
MIxed Air Sensor Input
Common
Common
OHS Input
Not used - OAT is
Connected to RTRM
RA Input
Common
Common
RHS Input
CO2 Sensor Input
Common
1
2
EXF
1
2
MAT
1
2
OAH/
OAE
P
Green LED
ABCDE
Settings
1
2
1
2
1
2
1
2
OAT
RAT
RAH/
RAE
DCV
2-10 VDC
Feedback
Input
2-10 VDC
Control
Output
+
-
+
-
- ModBus
Common
24VAC
+
1
2
3
4
DCV Setpoint
0-100%
P1
OFF: No Power or Failure
ON: Normal, OK to Economize
Slow Flash: Normal, Not OK to Economizer
Fast Flash: Communications Failure
Pulse Flash: Error Code:
1 Flash: Actuator Fault
2 Flashes: CO2 Sensor
3 Flashes: RA Humidity Sensor
4 Flashes: RA Temp Sensor
6 Flashes: OA Humidity Sensor
7 Flashes: OA Temp Sensor
8 Flashes: MA Temp Sensor
9-11 Flashes: Internal Fault-Replace ECA
Shorted - Force Closed
Open = On Board Pot.
270 = 50%
Ω
Remote
Minimum
Potentiometer
WHT
RED
BLUE
W7340A1012
Honeywell
Actuator = W7399A1004