GREYSTONE TXRCL Series Temperature Transmitter with LCD Installation Guide
- June 9, 2024
- Greystone
Table of Contents
Temperature
Transmitter with LCD
TXRCL Series
Installation Instructions
INTRODUCTION
The room temperature transmitter utilizes a precision curve-matched thermistor to measure temperature in an attractive, low profile wall mount enclosure. The device may also include an occupancy override button. The output is available as a linear 4-20 mA, 0-5 or 0-10 Vdc signal.
BEFORE INSTALLATION
Read these instructions carefully before installing and commissioning the device. Failure to follow these instructions may result in product damage. Do not use in an explosive or hazardous environment, with combustible or flammable gases, as a safety or emergency top device or in any other application where failure of the product could result in personal injury. Take electrostatic discharge precautions during installation. Do not exceed the device ratings.
MOUNTING
The temperature sensor mounts directly on a wall or onto an electrical wall
box. For the most accurate results, units should be mounted on an inside wall
to a wall box five feet from the floor. Do not mount the sensor near doors,
opening windows, supply air diffusers, or other known air disturbances. Avoid
areas where the sensor is exposed to vibrations or rapid temperature changes.
The cover is hooked to the base at the top edge and must be removed from the
bottom edge first. Use a small Phillips screwdriver to loosen the security
screw as shown in Figure 1. (Complete removal is not required). Use a screw
driver to carefully pry each bottom corner if necessary. Tip the cover away
from the base and sit it aside as shown in Figure 2.
The PCB must be removed from the base to access the mounting
holes. Follow usual anti-static procedures when handling the PCB and be
careful not to touch the sensors. The PCB is removed by pressing the enclosure
base to unsnap the latch near the bottom edge, then the PCB can be lifted out
of the base as shown in Figure 3.
Set the PCB aside until the base is mounted on the wall. For added protection,
place the PCB in the supplied anti-static bag. Mount the base by screwing it
to an electrical box or directly to the wall as shown in Figure 4.
After the base is screwed to an electrical box or the wall using the
appropriate holes, remove the PCB from the anti-static bag, feed connection
wires through center hole and place the top of the PCB into the PCB holders on
the backplate and snap the bottom of the PCB into place as shown in Figure 4.
Make wire connections as per the Wiring Illustrations on Page 2 and install
decorative cover by placing the top of the cover into the cover holder on the
top of the backplate and snapping the bottom into place ad shown in Figure 4.
Tighten security screw with a screwdriver.
WIRING
Deactivate the 24 Vac/dc power supply until all connections are made to the
device to prevent electrical shock or equipment damage. Follow proper
electrostatic discharge (ESD) handling procedures when installing the device
or equipment damage may occur.
Use 22 AWG shielded wiring for all connections and do not locate the device
wires in the same conduit with wiring used to supply inductive loads such as
motors. Connect the cable shield to ground at the controller only. Make all
connections in accordance with national and local codes.
Connect the plus dc or the ac voltage hot side to the POWER terminal. The
power supply common is connected to the COMMON terminal. The device is reverse
voltage protected and will not operate if connected backwards. It has a half-
wave power supply so the supply common is the same as the signal common.
Several devices may be connected to one power supply and the output signals
all share the same common. Use caution when grounding the secondary of a
transformer or when wiring multiple devices to ensure the ground point is the
same on all devices and the controller.
The analog output is available on the TEMP OUT terminal. For 4-20 mA output
type, all outputs operate in the Active mode and do not require a loop power
supply. This means the signal current is generated by the transmitter and must
not be connected to a powered input or device damage will result. Check the
controller Analog Input to determine the proper connection before applying
power. All output signals are referenced to the COMMON terminal.
The device is also available with field-selectable 0-5 or 0-10 vdc voltage
signal outputs which connect directly to a high impedance analog input. In
either case the terminal designations are the same and the signals are
referenced to COMMON.
The OCC IN terminal is a digital input that controls the OCC segment on the
LCD to indicate an occupied condition. It can be connected to a 0-5V digital
signal or a dry contact signal. This is usually an active low input signal and
requires that the OCC IN terminal be shorted to COMMON to activate the input.
The override switch output is a dry-contact and is available on the SWITCH +
and SWITCH – terminals. It is typically connected to a low-voltage digital
input on the controller to indicate room occupancy or override when the
button is activated..
START-UP
Verify that the transmitter is properly wired and connections are tight. Apply power and note that the LCD will begin displaying the temperature levels. All the output signals will also be available immediately after start-up.
LCD DISPLAY
The device is configured to display the temperature continuously. The Setup
Menu can be used to modify the displayed information. The device supports four
temperature ranges that may be selected in the menu. The default is 0 to 35°C
but this may be changed to 32 to 95°F and the output signal will stay the
same. Also the temperature range may be changed to 0 to 50°C or 32 to 122°F
and the output signal scaling will change to match the display.
OUTPUT
The temperature output is scaled such that 4-20 mA (or 0-5 or 0-101 Vdc)
equals either 0 to 35°C, 32 to 95°F, 0 to 50°C or 32 to 122°F depending on
which range is selected in the menu. The factory default range is 0 to 35°C.
SETUP MENU
The menu has several items as shown below, and the device cover must be
removed to access the menu.
To enter the menu, press and release the