RTC DFC-X Manuale utente

DOC# T0012 3.26.2019 DFC-X O&M

Ph. (877) 351-4702

www.RTC-Solutions.com

4370 Oakes Road, Suite 700

Fax (919) 400-4165

Email:in[email protected]

Davie, FL 33314

Model No. DFC-X Support 877-351-4702

DIRECT FIRED DIGITAL TEMPERATURE CONTROL INSTALLATION,

OPERATION, AND MAINTENANCE MANUAL

This manual covers the following products:

DFC-X

Direct fired control with integral 40-90°F (4-32°C) dial 0-24VDC output

TS-01

Temperature senor 40-250°F (4-121°C)

DFTD

Temperature dial 5 selectable ranges

RDU

Remote display unit

DAT-12

Discharge air tube

PWM-10V

PWM to 10V output converter

Table of Contents

Overview.....................................................................................................................................................................................................................................................2

Specifications..............................................................................................................................................................................................................................................2

Power Requirements..............................................................................................................................................................................................................................2

DFC-X Ambient Temperature Limits ..................................................................................................................................................................................................2

TS-01/DFTD Ambient Temperature Limits .......................................................................................................................................................................................2

Accuracy..................................................................................................................................................................................................................................................2

Installation ..................................................................................................................................................................................................................................................2

Wiring..........................................................................................................................................................................................................................................................2

Standard control with remote setpoint................................................................................................................................................................................................2

Standard control with integral setpoint ..............................................................................................................................................................................................3

Optional room space control ................................................................................................................................................................................................................4

Optional multiple setpoint temperature control ................................................................................................................................................................................5

Operation ....................................................................................................................................................................................................................................................5

Start up .................................................................................................................................................................................................................................................... 5

Sequence of operation............................................................................................................................................................................................................................5

Calibration ..............................................................................................................................................................................................................................................5

Troubleshooting .....................................................................................................................................................................................................................................5

LED Code Chart ....................................................................................................................................................................................................................................6

TS-01 and DFTD Resistance chart ........................................................................................................................................................................................................6

DOC# T0012 3.26.2019 DFC-X O&M

Ph. (877) 351-4702

www.RTC-Solutions.com

4370 Oakes Road, Suite 700

Fax (919) 400-4165

Email:in[email protected]

Davie, FL 33314

Overview

The Roof Top Control Solutions direct fired digital temperature control is a microprocessor based control that utilizes an intelligent PID software

algorithm to modulate gas flow to a burner in direct fired make up air applications. The closed loop system contains three components including the

temperature sensor (TS-01), the direct fired control (DFC-X), and the direct fired temperature dial (DFTD) or the remote display unit (RDU). The DFC-X

auto detects if there is a remote dial connected. When a remote is not connected, the DFC-X uses the internal setpoint. The system compares the

discharge temperature of the heating unit to the set point dial 40 times per second insuring accurate and repeatable temperature control. The software

provides smooth output control eliminating excessive swings observed with older analog systems. A 10 second start up delay is standard, and an

onboard LED indicates simple diagnostics.

Specifications

Power Requirements

DFC Ambient Temperature Limits

Storage

Operating

TS-01/DFTD Ambient Temperature Limits

Storage

Operating

Accuracy

24VAC 50/60Hz 20VA isolated class II

transformer

-40-140°F (-40-60°C)

-40-250°F (-40-121°C)

+/-3°F (1°C)

Installation

All control wiring should be shielded with the shielding grounded at one end only and/or the wiring should be

run in separate conduit from any high voltage wires. Interference from these sources could cause control function

errors or permanent damage. The DFC-X control should be mounted in a housing free from the elements of

weather. Insulated fork terminals are recommended for best contact when attaching wiring to the provided screw

terminals. The DFC-X can drive up to a .5 amp 24VDC direct acting solenoid.

The DFTD can be set to 5 different temperature ranges by moving jumper J1 as shown in Figure 1 on the back of

the dial to the desired position. 5 different temperature overlays are available to match the range chosen.

Wiring

Standard control with remote setpoint

Figure 2 –DFC-X wiring showing 24V DC output

Figure 1: DFTD Backside

DOC# T0012 3.26.2019 DFC-X O&M

Ph. (877) 351-4702

www.RTC-Solutions.com

4370 Oakes Road, Suite 700

Fax (919) 400-4165

Email:in[email protected]

Davie, FL 33314

PWM-10V

We do offer a PWM output converter to connect the DFC-X to a 0-10V actuator rather than a 24VDC solenoid valve. If you are utilizing the PWM-10V to

connect to a motorized actuator or any other device with it’s own power supply, than be sure the DFC-X has its own isolated transformer separate from

the power source for the actuator, or the control may be damaged.

Figure 3 –DFC-X wiring showing 0-10V DC output

Standard control with integral setpoint

The DFC-X, when using the onboard selector, should only be paired with RTC’s TS01(Temperature Sensor). Other resistive sensors can be used only

when paired with a compatible dial.

DOC# T0012 3.26.2019 DFC-X O&M

Ph. (877) 351-4702

www.RTC-Solutions.com

4370 Oakes Road, Suite 700

Fax (919) 400-4165

Email:in[email protected]

Davie, FL 33314

Figure 4 –DFC-X wiring showing 24V DC output

Optional room space control

Figure 5 - Room space control with thermostat

A standard make or break thermostat with normally open contacts can be connected between terminals 1 and 2 as shown in Figure 5. When connected

in this way the thermostat may be set for a desired room temperature for space control applications. When the room thermostat is satisfied, the

discharge temperature will return to the temperature set on the dial on the front of the DFTD. With older models of the DFTD, there is a

potentiometer(R1) on the back of the control that controls how much the temperature will increase by when the room thermostat calls for more heat. For

proportional room space control, the DFC-X may be connected as shown in Figure 6. See RDU literature for details.

Figure 6 - Room space control with digital space control

DOC# T0012 3.26.2019 DFC-X O&M

Ph. (877) 351-4702

www.RTC-Solutions.com

4370 Oakes Road, Suite 700

Fax (919) 400-4165

Email:in[email protected]

Davie, FL 33314

Optional multiple setpoint temperature control

Figure 7 - Control with multiple set points

More than one temperature dial can be connected as shown in Figure 7 for applications such as paint spray booths or process control.

Operation

Start up

Setting low fire –The minimum firing rate may be set by removing the wire from the terminal number 6 on the DFC-X control. This disconnects the

power to the control valve. Refer to the control valve manufacturer’s literature for this adjustment. You can also set low fire by entering Maintenance

Mode as described below.

Setting high fire –The maximum firing rate may be set by removing the wire from terminal number 4 on the DFC-X control. This disconnects the

discharge air sensor and sets the output to the control valve to its maximum. While setting high fire, the LED will repeatedly blink red. Refer to the

control valve manufacturer’s literature for this adjustment. You can also set high fire by entering Maintenance Mode as described below.

Sequence of operation

Upon applying power to the DFC-X control the 10 second start up delay will begin indicated by a slow blinking green LED (about once every 2 seconds)

on the face of the control. After the start up delay has completed, the LED will either repeatedly blink green twice or repeatedly blink green three times

depending on whether you are using an external setpoint or the internal setpoint. When using the internal setpoint the control will repeatedly blink

twice and when connected to an external setpoint it will repeatedly blink three times. At this time the control will begin modulating the output as

required. Any system errors are indicated by various LED codes described in Figure 8 below.

Maintenance Mode

To enter maintenance mode short terminals 1 with 2 as well as 3 with 4. The LED will blink red and green repeatedly to indicate it is in maintenance

mode. In this mode you can turn the knob on the front of the control to directly operate the valve. When turned all the way clockwise the valve would

be fully open. Conversely, when turned all the way counter clockwise the valve would be closed. This mode can be used to set low fire and high fire.

To set low fire, turn the knob counter clockwise and refer to the control valve manufacturer’s literature for this adjustment. To set high fire, turn the

knob clockwise and refer to the control valve manufacturer’s literature for this adjustment.

Troubleshooting

The DFC-X control provides some diagnostics via the on board LED labeled “STATUS”. A system fault is indicated by various LED codes described in

Figure 8. They usually indicate that the sensor or dial are either disconnected or improperly wired. Check all connections per the included wiring

diagrams. The fault also may be caused by a damaged sensor or dial. Both devices may be tested with an Ohmmeter by removing the wires from the

DOC# T0012 3.26.2019 DFC-X O&M

Ph. (877) 351-4702

www.RTC-Solutions.com

4370 Oakes Road, Suite 700

Fax (919) 400-4165

Email:in[email protected]

Davie, FL 33314

DFC control and measuring across the device. The devices should measure between 12.8K and 7K OHMS. If there is a fault light and the devices

measure the proper resistance then the control may be damaged. If there is no fault light but the system is not modulating properly you may check the

control output by repeating the start up procedure and measuring terminals 5 and 6 on the DFC-X as stated below.

Figure 8 –LED Code Chart

Measuring the Control Output

Remove the wire from terminal number 4 on the DFC control and measure the voltage across terminals 5 and 6 with a voltmeter. The meter should read

from 20 to 24 Volts. If it does not, disconnect the wires from the valve and measure the output without the valve connected. If it reads 20 to 24 Volts,

refer to the valve manufactures literature for troubleshooting the valve. If it does not the control may be damaged.

DFTS and DFTD Resistance chart

Sensor

Resistance

Dial Resistance

Temp °F

Temp °C

40-250

40-90

80-130

120-170

160-210

200-250

4.4

11210

11250

10.0

11020

11050

15.6

10826

10850

21.1

10630

10650

26.7

10433

10450

10380

32.2

10234

10250

10180

100

37.8

10034

9980

110

43.3

9830

9780

120

48.9

9624

9580

9590

130

54.4

9413

9380

9390

140

60.0

9199

9190

150

65.6

8983

8990

160

71.1

8766

8790

8700

170

76.7

8550

8590

8500

180

82.2

8337

8300

190

87.8

8130

8100

200

93.3

7930

7900

8060

210

98.9

7740

7700

7860

220

104.4

7560

7660

230

110.0

7393

7460

240

115.6

7237

7260

250

121.1

7095

7060

Indice

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