RTC User Manual - Titan Air Incorporated
Contents
1. chart DOC T0001 11 14 2006 DFC 1 O amp M Ph 919 845 1579 www RTC Solutions com 755 Sw 120 Way Fax 919 845 8102 Email info RTC Solutions com Davie FL 33325 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 24V AC 50 60Hz 20VA isolated class II DFC Ambient Temperature Limits transformer Storage Operating 40 140 F 40 60 C DFTS DFTD Ambient Temperature Limits 40 140 F 40 60 C Storage Operati ie pee 40 250 F 40 121 C ccuracy 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 source2. 33325
3. RTC DIRECT FIRED DIGITAL TEMPERATURE CONTROL Solutions 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 LO Aic ca eat 4 s EOE pe Pee TPT POR CPPEEPE LATEST PEI ERT TEES POS PEELE ESCM Ey EEE E Ee E ATSC POET EE EE ACANSS EEE eeTET ET EE AT terre reece pe eCTeERCRrE Terra FeVCeee rere teint A E RSG Rn 2 Specifications POWer Requirements prani ainan eR EEE NEER TERON ORNE SOS sd AALAN REO EORR TENOR 2 DEC Ambient Temperature Limits seii srai p a ea EEE EKE EE A ENERE E E REEE EE KEEA EE EE AEAEE a DFTS DFTD Ambient Temperature Limits A CCUTACY oea EES EESE Eene eE NATES REEERE Y iaae N aTe o ES AEA AE ES R S O EA EEO A E A A E ES Standard control with remote set point Standard control with integral set point Optional room spacetontrolys sii rn aa a E EEN A E E E E a E aed ala aa aes Optionalkmultiplesetpoint temperature Conto isss s nso an E TA RETARA AOAR ARN ARKAN OR 3 Operation Start up ice Sequence OF Operators aa Nn E tev sess NTE TEA N AT A E TOAN AN oeussarar NE 4 C librat on i eea A E EE R A SA A Co E E AE S E AE Troubleshooting DFTS and DFTD Resistance
4. e 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 can be connected as shown in Figure 5 See RTC 1 literature for details Optional multiple set point temperature control DFTD Low temperature selection dial DFTD High temperature selection dial woa om DFTS a a Temperature sensor n 0 ct 130 1 D Rte Re D i Solutions A S L Solutions p 1 2f3 24 24VDC Proportional o _ Solenoid Gas Valve 20 VA Transformer Volt AC f Volt AC DFC1 Mi Figure 6 Control with multiple set points More than one temperature dial can be connected as shown in Figure 3 for applications such as paint spray booths or process control DOC T0001 11 14 2006 DFC 1 O amp M Ph 919 845 1579 Fax 919 845 8102 www RTC Solutions com Email info RTC Solutions com 755 Sw 120 Way Davie FL 33325 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 Set
5. mperature 20 VA Transformer 4 r 4 120 VAC Important Actuator must be d by isolated source from pwmM 10y Powered gt y DFC control 20 VA Transformer 24 VAC f VAC DFC 1 RTC C Solutions Figure 2 Standard control wiring showing output options Ph 919 845 1579 Fax 919 845 8102 www RTC Solutions com Email info RTC Solutions com 755 Sw 120 Way Davie FL 33325 Standard control with integral set point Optional room space control DFTD Temperature Optional room selection dial DFTS Temperature sensor 24VDC Proportional Solenoid Gas Valve G 20 VA Transformer 24 Volt AC 120 Volt AC coea DFC2 RTC C Solutions Figure 3 Control with integral setpoint DIGITAL SPACE TEMPERATURE CONTROL thermosat Figure 4 Room space control with thermostat DFTS Temperature sensor 24VDC Proportional Solenoid Gas Valve 6VA Transformer 20 VA Transformer 24 Volt AC 120 Volt AC z DFC atc Cations DFTS Temperature sensor 24VDC Proportional Solenoid Gas Valve 2 D 20 VA Transformer 24 Volt AC 120 Volt AC DFC Figure 5 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 4 When connected in this way the thermostat may b
6. s 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 O O with it s own power supply the DFC must have it s own isolated transformer separate from the power source for the Figure 1 actuator or the control may be damaged Wiring Standard control with remote set point Wiring Connections For Siemens actuator Red G to 24 VAC Black G0 to 24VAC and Black on PWM 10V Gray Y to Red on PWM 10V Proportional actuator Pink U No Connect ce For Belimo actuator fe 1 to 24VAC and Black on PWM 10V 2 to 24VAC DFTD Temperature selection dial DFTD Temperature selection dial 3 to Red on PWM 10V DFTS Temperature sensor DOC T0001 11 14 2006 DFC 1 O amp M 24VDC Proportional solenoid gas valve 20 VA Transformer 24 VAC f 120 VAC DFC 1 atc Cations DFTS Te
7. stem 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 follows 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 Temper Tempe a00 80 130 120 170 160 210 200 250 40 4 4 DOC T0001 11 14 2006 DFC 1 O amp M Ph 919 845 1579 www RTC Solutions com 755 Sw 120 Way Fax 919 845 8102 Email info RTC Solutions com Davie FL
8. ting 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 it s 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 sy
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