Trane ReliaTel - Reliatel Economizer Module Layout (Honeywell)

96 RT-SVD03G-EN
ReliaTel Economizer Module Layout (Honeywell)
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 C0
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 59, p. 98.
Note: Remote minimum position input does not work when a CCP is controlling the unit.
Figure 57. 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
CO
2
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: CO
2
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