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Operation
RT-SVX19A-E444
Operation with a
conventional thermostat
The ReliaTel module has
conventional thermostat
connections as well as Zone Sensor
Module connections. When a
conventional thermostat is
controlling the unit, operation
differs as follows.
• Supply Air Tempering feature is
not available. If outdoor air is
being introduced through the
equipment, discharge air
temperature may be cold when
not actively heating.
• Proportional Integral (PI) control
is not available.
• Zone Sensor Diagnostics are
only available on the RTRM
module on the J6 terminals,
instead of at the Zone Sensor in
the space.
• Intelligent Fall-Back is not
available. If a failure occurs in
the device controlling the
equipment, operation will cease.
• Heat Pump Smart Recovery and
Smart Staging is not available.
Heat Pump operation becomes
more costly unless the generic
control being applied can
accomplish this.
• Remote Sensing Capabilities are
not available on most
mechanical thermostats.
• Space Temperature Averaging
capabilities are not available on
most mechanical thermostats.
• 27½ to 50 VAV – Conventional
thermostat input terminals are
inactive.
• Built in Night Set Back and
Unoccupied Functions function
differently with a conventional
mechanical thermostat.
• A built-in algorithm which allows
for automatic reset of the
discharge air temperature while
economizing is not available.
The terminal strip for attaching the
thermostat wires is located on the
RTRM module in the control
compartment.
The purpose of each terminal is
discussed in the next section.
COM
T
R
Y1
W1/0
G
W2
X2
Y2
Customers occasionally require
operation with a conventional
thermostat rather than a zone
sensor. In some cases there is a
preference for a specific thermostat
model, and in others there is
reluctance to adopt newer
technology that may not be as well
understood as conventional
thermostats. In addition, non-Trane
Building Controllers typically
provide an interface to HVAC
equipment based on a conventional
thermostat interface. Units applied
with this type of controller need to
accept conventional thermostat
inputs.
Conventional thermostat signals
represent direct calls for unit
functions. In their simplest
applications, thermostat contacts
directly control contactors or other
load switching devices. This function
provides inputs for the thermostat
signals and processing to enhance
reliability and performance.
Compressor protection and
reliability enhancement functions
(HPC, LPC, Minimum On/Off timers,
etc.). All operate the same whether
applied with zone sensors or a
conventional thermostat.
Logic is also provided to cause
appropriate unit functions when
inappropriate thermostat signals are
provided. Simultaneous calls for
heating and cooling will be ignored,
and the fan will be turned on with a
call for heating or cooling even if
the fan request is not detected.
If the thermostat is immediately
changed from a heating to a cooling
call, or vice versa, there will be a
five minute delay before the new
call will initiate.