CaptiveAire DFC-1 Installation Manual
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-XXXX Temperature dial 5 selectable ranges
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 set point .................................................................................................................................................................................................... 2
Standard control with integral set point ................................................................................................................................................................................................... 3
Optional room space control ...................................................................................................................................................................................................................... 3
Optional multiple set point temperature control .................................................................................................................................................................................... 3
Operation ........................................................................................................................................................................................................................................................... 4
Start up ........................................................................................................................................................................................................................................................... 4
Sequence of operation .................................................................................................................................................................................................................................. 4
Calibration ..................................................................................................................................................................................................................................................... 4
Troubleshooting ............................................................................................................................................................................................................................................ 4
DFTS and DFTD Resistance chart .............................................................................................................................................................................................................. 4
DOC# T0001 11.14.2006 DFC-1 O&M
Ph. (919) 845-1579 www.RTC-Solutions.com 755 Sw 120
Fax (919) 845-8102 Email:info@RTC-Solutions.com Davie, FL 33325
1
th
Way
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.
J1
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 it’s own power supply, the DFC must have it’s own isolated transformer separate from the power source for the
actuator, or the control may be damaged.
Figure 1
Wiring
Standard control with remote set point
DFTD
Temperat ure
selection dial
40 90
RTC
Solutions
132
7060
80
DFTS
Temper ature
senso r
12
24VDC Proportional
solenoid gas valve
20 VA Transformer
Proportional actuator
DFTD
Temper ature
selection dial
7060
50
40 90
RTC
Solutions
132
120 VAC24 VAC
80
DFTS
Temperature
senso r
12
BLACK
Wiri ng Conn ections
For Siemens actuator
Red(G) to 24 VAC
Black(G0) to 24VAC and Black on PWM -10V
Gray(Y) to Red on PWM-10V
Pink(U) No Connect
For Belimo actuator
1 to 24VAC an d Black on PWM-10V
2 to 24VAC
3 to Red on PWM-10V
20 VA Transformer
120 VAC24 VAC
*Important - Actuator must be
powered by isolated source from
PWM-10V
DFC contro l
20 VA Transformer
RED
120 VAC24 VAC
RTC
Solutions
DFC-1
RTC
Solutions
DFC-1
Figure 2 - Standard control wiring showing output options
2
DOC# T0001 11.14.2006 DFC-1 O&M
Ph. (919) 845-1579 www.RTC-Solutions.com 755 Sw 120
th
Way
Fax (919) 845-8102 Email:info@RTC-Solutions.com Davie, FL 33325
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