High Pressure Control - Trane RT-SVX38C-EN Installation, Operation And Maintenance Manual

General Information
If four consecutive open conditions occur during an active
call for cooling, the compressor will be locked out, a
diagnostic communicated to ICS™, if applicable, and a
manual reset required to restart the compressor. On dual
compressor units only the affected compressor circuit is
locked out.

High Pressure Control

ReliaTel Control
The high pressure controls are wired in series between the
compressor outputs on the RTRM and the compressor
contactor coils. If the high pressure control switch opens,
the RTRM senses a lack of current while calling for cooling
and locks the compressor out.
If four consecutive open conditions occur during an active
call for cooling, the compressor will be locked out, a
diagnostic communicated to ICS, if applicable, and a
manual reset required to restart the compressor. On dual
compressor units only the affected compressor circuit is
locked out.
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
compressor or refrigeration circuit switches. When the
RTRM is powered up,e.g., after a power failure, the control
will default to the number one circuit compressor.
Zone Sensor Module (ZSM) (BAYSENS106*)
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) (BAYSENS108*)
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 BAYSENS077*.
Zone Sensor (BAYSENS110*)
This electronic sensor features four system switch settings
(Heat, Cool, Auto, and Off) and two fan settings (On and
Auto) with four system status LEDs. It is a manual or auto
changeover control with dual setpoint capability. It can be
used with a remote zone temperature sensor
BAYSENS077*.
Programmable Zone Sensor—(BAYSENS119*)
This 7-day programmable sensor features 2, 3, or 4 periods
for Occupied or Unoccupied programming per day. If the
8
power is interrupted, the program is retained in
permanent memory. If power is off for an extended period
of time, only the clock and day may have to be reset.
The Zone Sensor allows selection of 2, 3, or 4 system
modes (Heat, Cool, Auto, and Off), two fan modes (On and
Auto). It has dual temperature selection with
programmable start time capability.
The occupied cooling set point ranges between 45ºF and
98ºF . The heating set point ranges between 43ºF and 96ºF .
A liquid crystal display (LCD) displays zone temperature,
temperature set points, day of the week, time, and
operational mode symbols.
The Option Menu is used to enable or disable applicable
functions, e.g., morning warm-up, economizer minimum
position override during unoccupied status, Fahrenheit or
Centigrade, supply air tempering, remote zone
temperature sensor, 12/24 hour time display, smart fan,
and computed recovery.
During an occupied period, an auxiliary relay rated for 1.25
amps at 30 volts AC with one set of single pole double
throw contacts is activated.
Status Inputs (4 Wires Optional)
The ZSM can be wired to receive four operating status
signals from the RTRM (HEAT, COOL, SYSTEM ON,
SERVICE).
Four wires from the RTRM should be connected to the
appropriate terminals (7, 8, 9, and 10) on the ZSM.
Remote Zone Sensor (BAYSENS073*)
This electronic sensor features remote zone sensing and
timed override with override cancellation. It is used with a
Trane Integrated Comfort™ building management
system.
Remote Zone Sensor (BAYSENS074*)
This electronic sensor features single setpoint capability
and timed override with override cancellation. It is used
with a Trane Integrated Comfort™ building management
system.
Remote Zone Sensor (BAYSENS016*)
This bullet type temperature sensor can be used for
outside air (ambient) sensing, return air temperature
sensing, supply air temperature sensing, remote
temperature sensing (uncovered). Wiring procedures vary
according to the particular application and equipment
involved. Refer to the unit's wiring diagrams for proper
connections.
Remote Zone Sensor (BAYSENS077*)
This electronic sensor can be used with BAYSENS106*,
108*, 110*, 119* remote panels. When this sensor is wired
to a BAYSENS119* Remote Panel, wiring must be 18 AWG
Shielded Twisted Pair (Belden 8760 or equivalent). Refer to
the specific remote panel for wiring details.
RT-SVX38C-EN