Honeywell H7625B User's Manual
Contents
1. 70 percent RH Be sure humidity is stable 2 Adjust span trimmer s Two Point Calibration 1 Select a controlled humidity environment between 10 and 40 percent RH Be sure humidity is stable Adjust zero trimmer z Select a controlled humidity environment between 70 and 75 percent RH Be sure humidity is stable 4 Adjust span trimmer s YN vA 63 2579 3 LonSpec is a trademark of Echelon Corporation Automation and Control Solutions Honeywell International Inc Honeywell Limited Honeywell Limit e 1985 Douglas Drive North 35 Dynamic Drive Golden Valley MN 55422 Scarborough Ontario M1V 4Z9 customer honeywell com Honeywell U S Registered Trademark 2005 Honeywell International Inc SEO aa edes 63 2579 3 B B Rev 01 05 post consumer paper fibers2. stable while making any adjustment Verify the device output directly with calibrated instrumentation and verify RH with calibrated instrumentation Never use a controller output With correct power applied and only a meter connected to the transducer output ensure that the output is proportional to the true RH Using Increment Decrement Switches Increment RH Output This DIP switch allows you to calibrate the sensor through the software The switch must be toggled from the Off to the On position and then returned to the Off position for an increase of 0 5 RH This means that if your humidity has drifted 196 lower over a certain time period you can toggle the Increment RH Output switch 2 times in order to slide the whole curve upward 196 Decrement RH Output This DIP switch allows calibration in the same way as the Increment RH The difference is that each toggle results in a decrease of 0 5 RH Using Calibration Trim Potentiometers IMPORTANT Due to sensitive nature of humidity calibration adjusting trimmer potentiometers is not highly recommended Calibrate only in a stable humidity temperature chamber of laboratory grade Single Point Calibration IMPORTANT Use only one of the following two options OPTION 1 1 Select a controlled humidity environment between 10 and 40 percent RH Be sure humidity is stable 2 Adjust zero trimmer z OPTION 2 1 Select a controlled humidity environment between 40 and
3. 0 REMOTE SENSOR SENSOR DISCHARGE AIR SENSOR SUBBASE MOTION Gnd Vin SENSOR 0 10 Vdc Vac HUMIDITY SENSOR A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A ENSURE TRANSFORMER IS SIZED TO HANDLE THE LOAD A HEAT COOL SYSTEMS WITH ONE TRANSFORMER REQUIRE THE FACTORY INSTALLED JUMPER A USE ECONOMIZER INSTRUCTIONS FOR INSTALLATION DIRECTIONS A HC AND HP PROVIDE 24 VAC TO THE HUMIDITY SENSOR Fig 3 Humidity sensor 0 10 Vdc output wiring with T7350 use with RH Temperature combination T7350 units only M22529 63 2579 3 H7625B H7635B C H7655B DUCT MOUNT AND OUTDOOR MOUNT HUMIDITY TEMPERATURE SENSORS W7760A A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A TEMPERATURE SIGNAL CONNECTIONS ARE NOT POLARITY SENSITIVE M18302B Fig 4 Typical wiring diagram for 5 wire temperature humidity sensor with Vdc output used with the XL15A controller 63 2579 3 4 H7625B H7635B C H7655B DUCT MOUNT AND OUTDOOR MOUNT HUMIDITY TEMPERATURE SENSORS CHECKOUT N CAUTION Equipment Damage Hazard Can short electric circuitry Never connect 120 Vac to the transducer Connect only DC voltage to a transducer intended for DC supply NOTE Use laboratory quality meters and gauges for applications requiring a high degree of accuracy 1 Verify the transducer is moun
4. Honeywell H7625B H7635B C H7655B Duct Mount and Outdoor Mount Humidity Temperature Sensors APPLICATION The H7625B H7635B H7655B Duct Mount and H7635C Outdoor Mount Humidity Temperature Sensors are universal Relative Humidity transmitters that can be powered with either a 18 to 36 Vdc or 24 Vac supply The sensors use a half wave bridge rectifier to convert AC power to a usable DC voltage The device also includes a 20K ohm temperature sensor for optional use The humidity sensors are designed with a field selectable 4 to 20 mA 0 to 5 Vdc or 0 to 10 Vdc output signal equivalent to 0 to 100 RH All units are shipped from the factory with a default setting to accept AC power with three wire O to 10 Vdc loop powered output INSTALLATION en Installing this Product Read these instructions carefully Failure to follow them could damage the product or cause a hazardous condition 2 Check ratings given in instructions and on the product to ensure the product is suitable for your application 3 Installer must be a trained experienced service technician 4 After installation is complete check out product operation as provided in these instructions N CAUTION Electrical Shock or Equipment Damage Hazard Can shock individuals or short equipment circuitry Disconnect power supply before installation N CAUTION Equipment Damage Hazard Improper wiring can damage the sensor beyond repair Follow the wiri
5. d temperature Mount this control where it can sense average outdoor air humidity and temperature Normally the north side of a building provides a suitable location NOTES oN oue H7635C is weatherproof for outdoor use Knockouts allow 1 2 in conduit connection To avoid damaging board during installation the cover can be detached completely 1 Carefully remove wire plug from board 2 Set the cover aside Open case by rotating the cover counterclockwise NOTE Orient case so the element points down Mount standard 1 2 in conduit to the case Use case to mark mounting screw pilot hole locations Drill pilot holes Fasten the case to the wall Wire the sensor See Wiring section NOTE The two free wires are thermistor wiring connections When connecting these use two wire nuts Reattach the wire plug and cover being careful not to pinch wires between the cover and case NORMAL OPERATION nan pamare Output Settings Table 1 The board has three switch blocks A six DIP switch block A four DIP switch block A white gang switch on a blue block 1 Adjust the 4 switch block according to Table 1 NOTE The 6 switch block normally requires no adjustment See the Appendix 2 Set the gang switch white switch in blue block to correspond with the output mA or Vdc NOTE SeeFig 1 for DIP switch locations Table 1 Controller Compatibility and Output Setting
6. ng instructions carefully INSTALLATION INSTRUCTIONS Mounting The method of mounting depends on the particular sensor application The following procedures include outdoor and duct applications Also refer to the instructions for the electronic control Duct Mounting The H7625B H7635B and H7655B can be mounted in a duct to sense humidity and temperature IMPORTANT Select a location to expose sensor to average duct humidity and temperature Avoid locations where stratification can cause sensing errors NOTES H7635C is weatherproof for outdoor use Knockouts allow 1 2 in conduit connection To avoid damaging board during installation the cover can be detached completely 1 Carefully remove wire plug from board 2 Set the cover aside 1 Cuta hole in the duct just large enough to accept the sensing element Open case by rotating the cover counterclockwise Mount standard 1 2 in conduit to the case Use case to mark mounting screw pilot hole locations Drill the pilot holes and fasten the sensor to the duct 6 Wire the sensor See Wiring section PON e NOTE The two free wires are thermistor wiring connections When connecting these use two wire nuts 7T Reattach the wire plug and cover being careful not to pinch wires between the cover and case 63 2579 3 H7625B H7635B C H7655B DUCT MOUNT AND OUTDOOR MOUNT HUMIDITY TEMPERATURE SENSORS Outdoor Mounting The H7635C senses outdoor air humidity an
7. s OFF EEN Fig 1 DIP switch locations and settings 63 2579 3 0 MA uas mm 0 5 VDC Required 4 Switch Block Blue and Sensor Settings White Output Output LoNSPEC Controller Setting 4 3 2 1 Switch Setting W7750 W7760 4 20 mA On 4 20 mA C7600C WTT61 W7750B C 0 10 Vdc On On Vout H7621 31 WTT60C default WTT53 W7760 17350 XL50 0 10 Vdc On On Vout n a XL100 default XL500 XF Modules XFL Non Honeywell 0 5 Vdc On On Vout n a OFF d WA ON 0 10 VDC OFF FPEM M22705 H7625B H7635B C H7655B DUCT MOUNT AND OUTDOOR MOUNT HUMIDITY TEMPERATURE SENSORS WIRING For voltage output shielded cable 16 22 AWG should be used mA OUTPUT TRANSDUCER ONLY a For current output either shielded cable or twisted pair 16 22 AWG can be used NOTE When using shielded cable ground the shield only at the controller end see Fig 2 Grounding both ends can cause a ground loop The 20K ohm NTC temperature output is accessed through the separate blue and green wires located inside the enclosure 18 TO 36 Vdc POWER SUPPLY N CONTROLLER METER OR RECORDER o INPUT SIGNAL o COMMON M22528 Fig 2 Typical wiring diagram for transducer with two wire mA output and external DC power supply OUTDOOR AIR T777
8. ted in the correct posi tion Converting Output Signal to Percent RH 4 to 20mA Signal signal in mA 4 _ aa 5 7 percent RH Example 12 mA output signal 12 4 0 16 50 RH 0 to 10 Vdc Signal Example 8 VDC transmitter signal output 2 Verify appropriate input signal and voltage supply 8 Vdc 0 10 80 RH 3 Verify appropriate configuration range Table 2 Troubleshooting Problem Items to Check No reading Verify correct supply voltage at the power terminal blocks Verify correct wiring configuration and DIP switch settings Verify that terminal screws are connected tightly with all wires firmly in place Erratic readings necessary to stabilize signal Verify all wires are terminated properly Ensure that there is no condensation on the board Verify clean input power In areas of high RF interference or noise shielded cable can be 5 63 2579 3 H7625B H7635B C H7655B DUCT MOUNT AND OUTDOOR MOUNT HUMIDITY TEMPERATURE SENSORS APPENDIX RH Test and Configuration DIP Switch Settings Table 3 IMPORTANT Only adjust these switches for troubleshooting or recalibrating the sensor Adjustment is not normally necessary For normal operation always keep DIP switch 3 in the ON position When DIP switch 3 is off the RH transmitter cannot read the sensor This inability to read forces the output to never change Table 3 Test Calibration Settings Six Switch Block Se
9. tting 6 5 4 3 2 1 Normal Operation Defaut On 096 RH Output On 50 RH Output On J 100 RH Output On Increment RH Output On Decrement RH Output On Reset to Original Calibration On On 63 2579 3 0 RH Output for Testing Only Transmitter always outputs a signal of 4 mA or 0 Vdc The sensor does not affect the transmitter output 50 RH Output for Testing Only Transmitter always outputs a signal of 12 mA 2 5 VDC or 5 VDC The sensor does not affect transmitter output 100 RH Output Transmitter always outputs a signal of 20 mA 5 VDC or 10 VDC The sensor does not affect the transmitter output Sensor doesn t affect the transmitter output Normal Operating Condition DIP switch 3 must be set in the On position for normal operation All other DIP switches must be set Off H7625B H7635B C H7655B DUCT MOUNT AND OUTDOOR MOUNT HUMIDITY TEMPERATURE SENSORS CALIBRATION All transducers are factory calibrated to meet exceed published specifications Field adjustment should not be necessary IMPORTANT Do not verify comparative RH with a sling psychrometer Too many variables exist which induce errors into this process Recalibration must be done in a controlled environment Relative humidity must be held
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