RT-SVX31A-EN6
System Input Devices &
Functions
The RTRM must have a zone sensor or
thermostat input in order to operate the
unit. The flexibility of having several
mode capabilities depends upon the
type of zone sensor or thermostat se-
lected to interface with the RTRM.
The descriptions of the following basic
Input Devices used within the RTRM
network are to acquaint the operator
with their function as they interface with
the various modules. Refer to the unit’s
electrical schematic for the specific
module connections.
The following controls are available
from the factory for field installation.
Supply Fan Failure Input (Optional)
The Fan Failure Switch can be con-
nected to sense indoor fan operation:
FFS (Fan Failure Switch) If air flow
through the unit is not proven by the dif-
ferential pressure switch connected to
the RTOM (factory set point 0.07 “
w.c.(17.4 Pa)) within 40 seconds nomi-
nally, the RTRM will shut off all me-
chanical operations, lock the system
out, send a diagnostic to ICS, and the
SERVICE output will flash. The system
will remain locked out until a reset is ini-
tiated either manually or through ICS.
Clogged Filter Switch (Optional)
The unit mounted clogged filter switch
monitors the pressure differential
across the return air filters. It is
mounted in the filter section and is con-
nected to the RTOM. A diagnostic SER-
VICE signal is sent to the remote panel
if the pressure differential across the fil-
ters is at least 0.5" w.c. (124.5 Pa). The
contacts will automatically open when
the pressure differential across the fil-
ters decreases to approximately 0.4"
w.c. (99.6 Pa). The clogged filter output
is energized when the supply fan is op-
erating and the clogged filter switch has
been closed for at least 2 minutes. The
system will continue to operate regard-
less of the status of the filter switch.
Compressor Disable (CPR1/2)
This input incorporates the low pressure
control (LPC) of each refrigeration circuit
and can be activated by opening a field
supplied contact installed on the LTB.
If this circuit is open before the com-
pressor is started, the compressor will
not be allowed to operate. Anytime
this circuit is opened for 1 continuous
second during compressor operation,
the compressor for that circuit is im-
mediately turned “Off”. The compres-
sor will not be allowed to restart for a
minimum of 3 minutes should the con-
tacts close.
If four consecutive open conditions
occur during the first three minutes of
operation, the compressor for that cir-
cuit will be locked out, a diagnostic
communicated to the remote panel (if
installed), and a manual reset will be
required to restart the compressor.
Low Pressure Control
ReliaTel Control
When the LPC is opened for 1 con-
tinuous second, the compressor for
that circuit is turned off immediately.
The compressor will not be allowed to
restart for a minimum of 3 minutes.
If four consecutive open conditions
occur during the first three minutes of
operation, the compressor will be
locked out, a diagnostic communi-
cated to ICS
TM
if applicable, and a
manual reset will be required to restart
the compressor.
High Pressure Control (Optional)
ReliaTel Control
The high pressure controls are wired
in series between the compressor out-
puts on the RTRM and the compres-
sor contactor coils. If the high pres-
sure control switch opens, the RTRM
senses a lack of current while calling
for cooling and locks the compressor
out.
On dual circuit units, if the high pressure
control opens, the compressor on the
affected circuit is locked out. A manual re-
set for the affected circuit is required.
ReliaTel Control
The power exhaust fan is started when-
ever the position of the economizer
dampers meets or exceed the power
exhaust setpoint when the indoor fan is
on.
The setpoint panel is located in the re-
turn air section and is factory set at
25%.
Lead/Lag Control (Dual Circuit Only)
ReliaTel Control Only
Lead/Lag is a selectable input located
on the RTRM. The RTRM is configured
from the factory with the Lead/Lag
control disabled. To activate the Lead/
Lag function, simply cut the wire
connected to J3-8 at the RTRM. When it
is activated, each time the designated
lead compressor is shut off due to the
load being satisfied, the lead compres-
sor or refrigeration circuit switches.
When the RTRM is powered up, i.e.
after a power failure, the control will
default to the number one circuit
compressor.
Zone Sensor Module (ZSM)
(BAYSENS006B)
This electronic sensor features three
system switch settings (Heat, Cool, and
Off) and two fan settings (On
and Auto). It is a manual changeover
control with single setpoint. (Cooling
Setpoint Only)
Zone Sensor Module (ZSM)
(BAYSENS008B)
This electronic sensor features four
system switch settings (Heat, Cool,
Auto, and Off) and two fan settings (On
and Auto). It is a manual or auto
changeover control with dual setpoint
capability. It can be used with a remote
zone temperature sensor
BAYSENS017B.
General Information
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