Ingersoll-Rand ReliaTel, Manual, Page: 127 / 176

RT-SVD03L-EN 127
ReliaTel ™ ™ Economizer Layout - RTEM
The RTEM 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 an 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 RTEM. The application section of this manual
shows how to apply a CO
2
sensor.
A stripped down version of the RTEM, which only
contains the MAT input, Design min. pos. adjustment,
Remote Min Position input, Enthalpy Setpoint, and the
wire plug for power and ModBus communications, is
also available. 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 Damper Position’ 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 76, p. 127 .
N No otte e:: Remote minimum position input does not
work when a CCP is controlling the unit.
Figure 76. ReliaTel ™ ™ economizer module layout (RTEM)
Economizer Actuator Layout -
Electromechanical
Electromechanical economizers since August 2014
(gray) use the ReliaTel
™ actuator.
E Ecco on no om miizze err