Greystone Energy Systems TXRCL Manuale utente

TXRCL Temperature Transmitter with LCD Installation Manual

August 8, 2014 1

Introduction

The TXRCL transmitter incorporates a temperature transmitter

in an attractive wall mount enclosure for the most efficient

environmental monitoring and control system. It uses a curve-

matched thermistor to measure temperature. The device may

also include an occupancy override button and an external

communication jack. The output is available as a linear 4-20

mA, 0-5 or 0-10 Vdc signal.

An LCD is included for configuration and local indication of all

parameters. Several operating parameters can be programmed using a keypad for specific applications including four

temperature ranges and C/F display.

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 stop device or in any other application where failure of the product could result in personal injury. Take

electrostatic discharge precautions during installation and do not exceed the device ratings.

Mounting

The room type sensor installs directly on a standard electrical box and should be mounted about five feet from the floor of the

area to be controlled. Do not mount the sensor near doors, opening windows, supply air diffusers or other known air

disturbances.

The cover is hooked to the base at the top edge and must be removed from the bottom edge first. Use a small screwdriver to

carefully pry each bottom corner if necessary. If a security screw is installed on the bottom edge, then it may have to be

loosened or removed also. Tip the cover away from the base and sit it aside.

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 or bend the sensors. The pcb is removed by pressing the tab on the enclosure base to unsnap

the latch near the bottom edge, then the pcb can be lifted out of the base. Sit the pcb aside until the base is mounted on the

wall.

After the base is screwed to an electrical box or the wall using the appropriate holes, pull the wires through the wiring hole in

the center of the pcb and then gently reinstall it in the enclosure base. Ensure the pcb is snapped into the base securely and

correctly. The mounting hole locations are shown in the following drawing.

TXRCL Temperature Transmitter with LCD Installation Manual

August 8, 2014 2

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.

This is a sourcing device and requires 3 to 11 wires depending on features ordered. 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 analog output signals

are typically connected directly to the Building Automation System and used as control parameters or for logging purposes.

The device is also available with 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.

The resistive fan speed output signal is available on the FAN + and FAN – terminals and has five positions.

The external jack is internally connected to a three-pin terminal block labeled RING, MID and TIP to accept a stereo phono

plug for remote communication with the controller.

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 0-35 C but this

may be changed to 32-95 F and the output signal will stay the same. Also, the temperature range may be changed to 32-122

F or 0-50 C 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 0-10 Vdc) equals either 0-35 C, 32-95 F, 0-50 C or 32-122

F depending on which range is selected in the menu. The factory default range is 0-35 C.

TXRCL Temperature Transmitter with LCD Installation Manual

August 8, 2014 3

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 <MENU> key while in normal operation. This will enter the Setup Menu step 1, pressing the <MENU>

key a second time advances to step 2. Each press of the <MENU> key advances the menu item. No values are changed by

using the <MENU> key but the previous value is saved, so any changes made will be saved by pressing the <MENU> key.

The <UP> and <DOWN> keys are used to make changes to program variables by scrolling through the available options.

When a value is changed, use the <MENU> key to save it to memory and advance to the next menu item.

Setup Menu operation is explained below and the factory default values are shown. Note that some items that are not

applicable to the hardware configuration are skipped in the menu so the menu may skip from item 4 to item 6 for example.

<MENU> Press and release the <MENU> key to enter the Setup Menu

1. C/F The temperature scale defaults to Celsius (°C). It can be changed to Fahrenheit

(°F) by using the <UP> or <DOWN> keys. This item is not shown for RH + RH

Setpoint models. This setting will effect other parameters.

<MENU>

2. Temperature Range

Two temperature ranges are available for both °C and °F, 0-35 C (32-95 F)

or0-50C (32-122 F). This can be changed with <UP> or <DOWN>.

<MENU>

3. Temperature Offset

Use<UP>or<DOWN>toaddorsubtract an offset to the temperature output

signal and display. The default is 0 but can be changed from –9 to +9 °F for

temperature calibration.

<MENU>

4. OCC Reverse

The default OCC signal type is active low (Lo). Can change with <UP> or

<DOWN> to active high (HI) to reverse the OCC action. By default, shorting

the OCC input to common will turn on the OCC LCD segment.

<MENU>

5. Backlight Enable

Usethe<UP>or<DOWN>keysto enable or disable the LCD backlight.

bL1 = backlight on, bL0 = backlight off.

<MENU> Exits the Setup Menu and returns to normal operation.

TXRCL Temperature Transmitter with LCD Installation Manual

August 8, 2014 4

Specifications

Temperature Sensor . . . . . . . . . . . . . . . . . . . 10K Ohm Type 7 Curve matched thermistor

Accuracy . . . . . . . . . . . . . . . . 0.2 C (0.4 C)

Range . . . . . . . . . . . . . . . . . . . 0 to 35 C (32 to 95 F) or 0 to 50 C (32 to 122 F) programmable

Offset . . . . . . . . . . . . . . . . . . . 9 F programmable

Display Units . . . . . . . . . . . . . C or F programmable

Display Resolution . . . . . . . . . 0.5° < 100°, 1° > 100°

Override Front panel push-button available as dry-contact two-wire output

N.O., 50 mA @ 12 Vdc

Communication 3.5 mm phono jack . . . . . . . . Connects to 3-pin terminal block (Ring, Tip, Mid)

Fan Speed Switch Range . . . . . . . . . . . . . . . . . . . Off, Auto, Low, Medium, High

Signal . . . . . . . . . . . . . . . . . . . 0, 2, 4, 6 and 8K standard, two-wire output (other values available)

Occupied Input Signal Type . . . . . . . . . . . . . . Digital input, 0/5 Vdc or dry contact to common

Logic . . . . . . . . . . . . . . . . . . . Active low or active high programmable

Action . . . . . . . . . . . . . . . . . . Causes “OCC” segment to light on LCD

LCD Display Display Size . . . . . . . . . . . . . . 38.1 x 16.5 mm (1.5” w x 0.65” h)

Digit Height . . . . . . . . . . . . . . 11.43 mm (0.45”)

Symbols . . . . . . . . . . . . . . . . . F, C, %RH, OCC

Backlight . . . . . . . . . . . . . . . . Enable or disable via menu

General Power Supply . . . . . . . . . . . . . 24 Vac/dc 10% (non-isolated half-wave rectified)

Consumption . . . . . . . . . . . . . . 40 mA max @ 24 Vdc

Input Voltage Effect . . . . . . . . Negligible over specified operating range

Protection Circuitry . . . . . . . . .Reverse voltage and MOV protected, output limited

Output Signals . . . . . . . . . . . . 4-20 mA active (sourcing) or 0-5/0-10 Vdc (specify when ordering)

Output Resolution . . . . . . . . . 10 bit

Output Drive Capability . . . . . 550 ohm max for 4-20 mA, 10 Kohm min for voltage

Programming and Selection . . Via pushbuttons and on-screen menu

Operating Conditions . . . . . . . 0 to 50 C (32 to 122 F), 0 to 95 %RH non-condensing

Wiring Connections . . . . . . . . Screw terminal block (14 to 22 AWG)

Enclosure . . . . . . . . . . . . . . . . Wall mount, 84 x 117 x 29 mm (3.3”w x 4.6”h x 1.15”d)

TXRCL Temperature Transmitter with LCD Installation Manual

August 8, 2014 5

Terminal Function

POWER From +24 Vac/dc of controller or power supply

COMMON To GND or COMMON of controller

OCC IN From digital output of controller

TEMP OUT Temperature output to analog input of controller

4-20 mA or 0-5/0-10 Vdc

SWITCH + Override switch + to digital input of controller

SWITCH - Override switch - to COMMON of controller

FAN + Fan speed switch + to analog input of controller

FAN - Fan speed switch - to COMMON of controller

TIP External jack TIP (tip of plug) connection

MID External jack MID (middle of plug) connection

RING External jack RING (base of plug) connection

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