RT-SVX056D-GB
39
Zone temperature source
The zone temperature source are summarized in the
table below by hierarchy order.
Source
Condition
1. BAS
BAS command enabled
&
Value in validity range [-10°C; +50°C]
2. Zone Temp Sensor
Ad-hoc Config enabled
&
Value in validity range [-10°C; +50°C]
3. Zone Temp THS04
THS04 installed
&
Ad-hoc Config enabled
&
Value in validity range [-10°C; +50°C]
4. Conventional Thermostat
Ad-hoc config enabled
4. Return Air Temp
Value in validity range [-10°C; +50°C]
CO2 sensor
CO2 sensor can be either in air return duct or wall
mounted. It maintains a CO2 concentration below a
preset value to ensure acceptable comfort.
Controls the opening of the fresh air damper of the
economizer. The outside air damper will modulate in
order to maintain the CO2 concentration below the
setpoint.
To open damper it should combine the amount of
desired fresh air and the free cooling mode to modulate
from 0 to 100% maximum opening of the dampers.
It is possible to preset a minimum opening during
commissioning.
The CO2 sensor is set for 0-10V analog outputs and
provide sensing of carbone dioxide over a range of
0-2000 ppm. The sensor requires a 24 VDC power
supply. Consult wiring diagram supplied with the unit
for details.
The resolution of analog outputs reaches 10 ppm CO2.
The information is then sent to the controller CH536 to
control the opening position of the fresh air damper.
Avoid locating the duct sensor on surfaces with an
uncooled, unheated area behind them or in “dead”
spot behind doors or in corners. The CO2 wall mounted
sensor should be placed on a flat surface, 1.4 m from
the floor in an area of the room where there is free air
circulation.
CO2 sensor maintenance
This CO2 sensor has excellent stability and requires no
maintenance. In most environments the recommended
calibration interval is five years. A trained service
technician can use a portable CO2 meter to certify
sensor calibration. If, when checking the sensor, the
reading differs too much from the reference value, the
sensor can be recalibrated in the field. A calibration kit,
software, and calibration gases are required. If certified
accuracy is required, the sensor must be calibrated
against accurate and traceable calibration gases in a
laboratory. Consult Trane BAS for further details.
Fire thermostat
U12 is the dedicated I/O. Optional fire thermostat should
be configured if present according to wiring diagram.
Clogged filter detector
This device is mounted in the filter section. The sensor
measures the difference in pressure before and after
the filter section. The information is sent to the optional
service terminal or the BMS.
Smoke Detector
This device is used to detect smoke in the air stream.
It includes a factory mounted detector located in the
control panel. When smoke is detected, it shuts off
the unit.
Other accessories available
- DTS : duct mounted wired temperature sensor
The duct mounted sensor - mainly for unit with auxliary
heat - must be installed away of any duct singularities
and generally at 2 m of any duct elbow or duct inside
element both upstream and downstream.
- TZS01 : wall mounted wired temperature sensor
- THP05 : wall mounted thermostat
Refer to separate documentation for more information.
Alarm and Warnings
Alarms stop the unit or reduce the heating/cooling
capacity. Alarm can be either manual reset (requires
human intervention to re-start the unit) or automatic
reset.
Warning run the unit in fall-back mode.
Example : if outdoor air humidity sensor is not working,
the economizer runs in dry-bulb mode.
Events are accessible through optional local service
terminal which display the current events and
display history of past events (up to 99 alarms
and 99 warnings).
Controls
