RTC DFC Series Bedienungsanleitung

DFC-1 STANDARD TEMPERATURE CONTROL

RDU

DFC+

DAT

DFTS

Ph. 877.351.4702

Fax 919.845.8102

www.RTC-Solutions.com

4380 Oakes Road, Suite 804

Davie, Florida 33314

24 Volt AC input

Built in 15 second low fire start timer

0-24 Volt DC modulating output

Remote temperature selection

Calibration trim pot

Fits ¼” wiring terminals

Mounting footprint matches other industry standard controls

Rated for -40°F (-40°C)

DFC-2 TEMPERATURE CONTROL w/ INTEGRAL 40°F-90°F SELECTOR

DFTD TEMPERATURE SELECTION DIAL

DFTS TEMPERATURE SENSOR

DAT DISCHARGE AIR TUBE

24 Volt AC input

Built in 15 second low fire start timer

0-24 Volt DC modulating output

Integral temperature selection

Calibration trim pot

Fits ¼” wiring terminals

Mounting footprint matches other industry standard controls

Rated for -40°F (-40°C)

5 Selectable temperature ranges with one dial

40°F-90°F (4°C-32°C)

80°F-130°F (26°C-54°C)

120°F-170°F (48°C-26°C)

160°F-210°F (71°C-99°C)

200°F-250°F (93°C-121°C)

Combine dials for dual temperature selection

Fits ¼” wiring terminals

Mounting footprint matches other industry standard controls

40°F-250°F (4°C-121°C) temperature range

Fits ¼” wiring terminals

Mounting footprint matches other industry standard controls

Galvanized construction

Mounting footprint matches other industry standard controls

DOC# T0001 8.11.2014 DFC-X O&M

Ph. (877) 351-4702

www.RTC-Solutions.com

4380 Oakes Road, Suite 804

Fax (919) 845-8102

Email:info@RTC-Solutions.com

Davie, FL 33314

Model No. DFC-X

DIRECT FIRED DIGITAL TEMPERATURE CONTROL INSTALLATION,

OPERATION, AND MAINTENANCE MANUAL

This manual covers the following products:

DFC-1

Standard direct fired temperature control 0-24VDC output

DFC-2

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

DFTS

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 Ambient Temperature Limits ......................................................................................................................................................................................................2

DFTS/DFTD Ambient Temperature Limits .......................................................................................................................................................................................2

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

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

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

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

Standard control with integral setpoint ..............................................................................................................................................................................................4

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

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

Operation ....................................................................................................................................................................................................................................................6

Start up .................................................................................................................................................................................................................................................... 6

Sequence of operation............................................................................................................................................................................................................................6

Calibration ..............................................................................................................................................................................................................................................6

Troubleshooting .....................................................................................................................................................................................................................................6

DFTS and DFTD Resistance chart ........................................................................................................................................................................................................6

DOC# T0001 8.11.2014 DFC-X O&M

Ph. (877) 351-4702

www.RTC-Solutions.com

4380 Oakes Road, Suite 804

Fax (919) 845-8102

Email:info@RTC-Solutions.com

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

direct fired temperature sensor (DFTS), the direct fired control (DFC), and the direct fired temperature dial (DFTD). 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

DFTS/DFTD Ambient Temperature Limits

Storage

Operating

Accuracy

24VAC 50/60Hz 20VA isolated class II

transformer

-40-140°F (-40-

60°C)

-40-140°F (-40-

60°C)

-40-250°F (-40-

121°C)

-40-250°F (-40-

121°C)

+/-3°F (1°C)

Installation

All control wiring should be shielded with the shielding grounded 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 control should be mounted in a housing free from the elements of weather. Insulated fork terminal

terminations are recommended for best contact when attaching wiring to the provided screw terminals. Models DFC-1

and DFC-2 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.

** Important! When using the PWM-10V output converter to connect the DFC to a motorized actuator, or any other

device with its own power supply, the DFC must have its own isolated transformer separate from the power source

for the actuator, or the control may be damaged.

Wiring

Standard control with remote setpoint

Figure 2 – DFC-1 wiring showing 24V DC output

Figure 1: DFTD Backside

DOC# T0001 8.11.2014 DFC-X O&M

Ph. (877) 351-4702

www.RTC-Solutions.com

4380 Oakes Road, Suite 804

Fax (919) 845-8102

Email:info@RTC-Solutions.com

Davie, FL 33314

Figure 3 – DFC-1 wiring showing 0-10V DC output

DOC# T0001 8.11.2014 DFC-X O&M

Ph. (877) 351-4702

www.RTC-Solutions.com

4380 Oakes Road, Suite 804

Fax (919) 845-8102

Email:info@RTC-Solutions.com

Davie, FL 33314

Standard control with integral setpoint

Figure 4 – DFC-2 wiring showing 24V DC output

Optional room space control

Figure 5 - Room space control with thermostat

DOC# T0001 8.11.2014 DFC-X O&M

Ph. (877) 351-4702

www.RTC-Solutions.com

4380 Oakes Road, Suite 804

Fax (919) 845-8102

Email:info@RTC-Solutions.com

Davie, FL 33314

Figure 6 - Room space control with digital space control

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. Potentiometer R1 on the back of the DFTD sets how

much the temperature will increase by when the room thermostat calls for more heat. When the room thermostat is satisfied, the discharge temperature

will return to the temperature set on the dial on the front of the DFTD. For proportional room space control, the DFC-1 may be connected as shown in

Figure 6. See RDU literature for details.

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.

DOC# T0001 8.11.2014 DFC-X O&M

Ph. (877) 351-4702

www.RTC-Solutions.com

4380 Oakes Road, Suite 804

Fax (919) 845-8102

Email:info@RTC-Solutions.com

Davie, FL 33314

Operation

Start up

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

the control valve. Refer to the control valve manufactures literature for this adjustment.

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

discharge air sensor and sets the output to the control valve to its maximum. Refer to the control valve manufactures literature for this adjustment.

Sequence of operation

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

face of the control. After the start up delay has completed, the LED will turn solid and the control will begin modulating the output as required. Any

system errors are indicated by a fast blinking LED (about twice per second) for instance when the discharge air sensor is disconnected or outside of the

normal operating range.

Calibration

The temperature control should maintain an accuracy of +/- 3°F (1°C). In the event that the discharge is inaccurate due to duct losses the control may be

calibrated in two ways. The potentiometer on the face of the DFC labeled “ADJUST” will adjust the discharge temperature by +/- 10°F (5°C) when

rotated. Rotating it clockwise will increase the temperature and counter clockwise will decrease the temperature. The system may also be adjusted from

the DFTD if installed by adjusting potentiometer R3 on the back in the same manner as the DFC procedure above.

Troubleshooting

The DFC control provides some diagnostics via the on board LED labeled “POWER/STATUS”. A system fault is indicated by a fast blinking LED (about

twice per second). This usually indicates 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 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 as stated below.

For DFC-1 and DFC-2

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

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