Honeywell R7500C User's Manual
Contents
1. TEST POINT Y1 FEFEFE TME TETA C8041 Fig 6 Test Points and Calibration Adjustment Locations All R7500 series of controllers include test points on the left side of the front panel see Fig 6 All Controllers have the following points Y1 Output voltage yellow leadwire 1 Power supply violet leadwire Power supply orange leadwire Using the appropriate scale voltmeter insert test probes into appropriate holes for voltage checks R7500C WIDE RANGE PROPORTIONAL TEMPERATURE CONTROLLER NOTE 1 To ensure correct voltage readings in the following tests a 500 ohm resistor should be substituted for the compensation sensor if its temperature is not near 75F 24C and comp ratio should be set at 20 2 If the controller output is not connected wire a 390 ohm load resistor from orange to yellow wires R7500 Adjust setpoint knob to correspond to the ambient temperature at the main sensor Set the proportional band at 5 The output voltage between points Y1 and should be approximately one half power supply voltage minus 0 6 Vdc If this reading is not found the device can be recalibrated by adjusting the calibration potentiometer No 2 left center of panel see Fig 6 until this reading is reached 95 7205 Home and Building Control Home and Building Control Honeywell Inc Honeywell Limited Honeywell Limit e Honeywell Plaza 740 Ellesmere Road P O Box 524 Scarborough O2. of wires when making connections R7503 BALCO MAIN SENSOR CONVERTER BLACK ORANGE O YELLOW Y VIOLET ORANGE POWER BROWN BALCO COMPENSATION SENSOR BOTH ORANGE WIRES ARE ELECTICALY IDENTICAL A OPTIONAL DISCHARGE COMPENSATION SENSOR SUBSTITUTE WITH 500 OHM RESISTOR WHEN COMPENSATION IS NOT USED C7828 Fig 2 Typical Hookup Diagram of R7500C Model with Integral Setpoint Adjustment NOTE When the compensation sensor is not used substitute a 500 ohm resistor and set the compensation ratio at the maximum setting 20 95 7205 When determining proper wire size remember there are two wires to the sensor and the setpoint potentiometer Double the distance to the sensor or potentiometer to obtain the proper wire length Calibration of the controller will be offset approximately 1F 0 5C for every one ohm of lead wire resistance BALCO MAIN SENSOR 14002385 008 REMOTE SETPOINT ADJUST BALCO COMPENSATION SENSOR CONNECT Z D FOR DIRECT ACTION Z R FOR REVERSE OPTIONAL DISCHARGE COMPENSATION SENSOR SUBSTITUTE WITH 500 OHM RESISTOR WHEN COMPENSATION IS NOT USED MOVE WIPER UP TO RAISE SETPOINT BOTH ORANGE WIRES ARE ELECTRICALY IDENTICAL C7829 Fig 3 Typical Hookup Diagram of R7500C with Remote Temperature Selector R7500C WIDE RANGE PROPORTIONAL TEMPERATURE CONTROLLER r 11 12 Vdc ig POWER 7 SUPPLY MODULTROL IV MOTOR BALCO MAIN SENSOR BLACK ORANGE L1 BE 4 ORANGE Y
3. setpoint 3 5 degrees of rotation per ohm of leadwire resistance or per degree off calibration To compensate for the compensation sensor leadwire resistance adjust the top left potentiometer R1 Cal Pot No 1 clockwise 3 2 degrees of rotation per ohm of leadwire resistance or per degree off calibration Cal Pot No 1 also can be used to vary the compensation start point temperature at which compensation affect is zero The factory compensation start point setting is 70F Turning Cal Pot No 1 CCW lowers the compensation start point temperature 95 7205 CHECKOUT AND TESTING CHECKOUT The only checkout ordinarily required is to slowly rotate the Setpoint Adjustment through the total proportional band of the device to determine if the output devices operate properly If the system does not function properly or the controller appears to be out of calibration proceed with the following testing information TESTING Before testing be sure the Controller power supply 11 to 12 Vdc is present at test point and 1 of R7500 models If the correct supply voltage is not available at these points check the power input device as indicated in the literature accompanying the applicable unit NO 1 R1 a_i CALIBRATION F POTENTIOMETER P l POWER SUPPLY TEST POINT p5 2 P o hae Hr T F i ET Ly hi Bun J i i NO 2 R7 CALIBRATION POTENTIOMETER POWER SUPPLY TEST POINT OUTPUT VOLTAGE
4. ELLOW 7500 X FORMER BROWN VIOLET A S M7186A1004 M7185G1000 BALCO COMPENSATION SENSOR C AND T2 ARE INTERNALLY CONNECTED AN 8 2K OHM RESISTOR IS PROVIDED INTERNALLY TO CORRECTLY LOAD THE R7500 OUTPUT A OPTIONAL COMPENSATION SENSOR SUBSTITUTE WITH 500 OHM RESISTOR WHEN COMPENSATION IS NOT USED C7830 Fig 4 Hookup Diagram of R7500 to Modutrol IV Motors ADJUSTMENTS amp CALIBRATION ADJUSTMENTS Set the following adjustments as specified on job drawing or as required TEMPERATURE SETPOINT ADJUSTMENT Integral setpoint adjustment is provided on the R7500C When it is desired to use a remote setepoint adjustment set the integral setpoint adjustment knob to the same temperature as the top end of the remote setpoint scale When using the 14002385 008 remote setpoint assembly set the integral setpoint knob to REMOTE Calibration of the remote potentiometer will then be correct PROPORTIONAL BAND PB ADJUSTMENT This adjustment indicates the change in temperature required at the sensor to move the final control device i e valve i pdt Er OIE FEA damper from one extreme position to the other full on to full off The controller has the highest gain with the lowest PB setting Fig 5 View of R7500C with Cover Removed Showing Adjustment Locations 95 7205 R7500C WIDE RANGE PROPORTIONAL TEMPERATURE CONTROLLER COMPENSATION RATIO ADJUSTMENT Compensation ratio is the number of degrees temperature ch
5. Honeywell R7500C Wide Range Proportional Temperature Controller BEFORE INSTALLATION Refer to job drawings for specific installation information and mounting location Main and compensation sensors when used must be 500 ohm Balco sensors L7022 L7025 L7033 T7506 or T7001 This controller is surface mounted through the two holes in the back of the case Observe ambient temperature 30 to 140F 0 to 60C and relative humidity 5 to 95 limitations No special tools are required to install this controller CAUTION This controller requires a 11 to 12V dc power supply for proper operation The power may be supplied by an R7503 Modutrol Motor Converter R7504 Two Position Converter RP7505 Pneumatic Transducer Electronic Modutrol Motors M734K or M745J any other device designed for use with this Temperature Controller or a separate dc power supply This controller outputs 4 to 7 Vdc across the proportional band setting It is designed to work with motors and actuators that expect a 4 to 7 Vdc input signal MOUNTING This controller can be surface mounted in any convenient location such as on duct walls end compartments of unit ventilators etc Copyright 1995 Honeywell Inc All Rights Reserved INSTALLATION INSTRUCTIONS They are fastened to the mounting surface through the two diagonally opposed mounting holes in the back of the case See Fig 1 For access to the mounting holes remove the cover fro
6. ange required at the compensation sensor to change the primary sensor control point one degree F When a compensation sensor T2 is used the compensation ratio adjustment provides a means for adjusting the effect of the compensation sensor on the primary sensor T1 For example with a compensation ratio setting of 10 a 10 degree F drop in temperature at the compensation sensor is required to increase the controlled temperature 1 degree F This adjustment has a range of 0 25 to 20 A blank table provided in the controller is for noting the compensation schedule Use the formula below to calculate the compensation ratio for hot water reset applications Change in outside air temp Camp Ratios ange inihol water leme RE Adding P B to the change in hot water temperature compensates for proportional offset CALIBRATION The R7500 family of controllers are factory calibrated and checked prior to shipment and should operate satisfactorily on job startup If the sensor and or the setpoint potentiometer are a long distance from the controller it may be necessary to recalibrate the controller Calibration potentiometers are behind the three holes on the left side of the front panel see Figure 6 To compensate for main sensor and or setpoint potentiometer lead wires or calibration adjust the middle potentiometer R7 Cal Pot No 2 clockwise This compensates for leadwire length and a controlling temperature which is lower than the
7. m the case by loosening the cover mounting screw The mounting holes are now visible through the circuit board notches in the upper right and lower left hand corners Determine placement of the mounting holes in the surface and scribe the mounting hole locations Drill pilot holes and fasten with No 10 screws Fig 1 Approximate Installation Dimensions in inches Millimeters 95 7205 R7500C WIDE RANGE PROPORTIONAL TEMPERATURE CONTROLLER Table 1 Wire Resistance Ohms per 1 000 Feet 304m Wire Dia Ohms 1000 ft Wire Gage Size mm 304 m of Wire WIRING All wiring must agree with local electrical codes and ordinances Since the Controller circuits are rated NEC Class 2 some local codes allow open no conduit wiring Number 18 gage 1 0 mm insulated wire or two or three conductor thermostat cable is acceptable for use with these Controllers except on long sensor or remote setpoint potentiometer runs where a larger wire size should be used See Table 1 All control wiring connections to the Controller are made to the 6 inch 152 mm color coded leadwires found bundled under the cover There are two orange wires to facilitate connections to the converter and or sensors Crimp type connectors are recommend for field connections of the control wiring Refer to job drawings for specific wiring information See Figures 2 through 4 for some typical wiring diagrams IMPORTANT Observe color coding
8. ntario Minneapolis MN 55408 0524 MIP 2V9 95 7205 Rev 10 95 Printed in U S A Honeywell Helping You Control Your World QUALITY IS KEY
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