SRH3 - In Duct Diagnostic Psychrometer
Contents
1. Figure 2 Use the RCONE1 for hands free in duct u Diagnostic Psychi measuremesnts A C Basics The Evaporator Condenser Restrictor Throttling valve and Compressor are the four basic components of an air conditioner Following one pound of refrigerant through the system shows the function of each component Subcooled liquid refrigerant at high pressure enters the restrictor and is throttled to saturated refrigerant at a lower pressure The restrictor can be of either a fixed or TXV EXV type The fixed type must be charged toa target superheat that varies with indoor and outdoor conditions TXV EXV systems must be charged to subcooling The evaporator capacity varies with the indoor heat load on a fixed restrictor The TXV EXV regulates the size of the restriction to maintain a constant superheat This essentially adjusts the capacity of the evaporator responding to the indoor heat load After the restrictor refrigerant enters the evaporator at a low temperature and pressure and boils evaporates For Service In the USA call Fieldpiece Instruments for one price fix all out of warranty service pricing Send check or money order for the amount quoted Send the meter freight prepaid to Fieldpiece Instruments Send proof of date and location of purchase for in warranty service The meter will be repaired or replaced at the option of Fieldpiece and returned via least cost transportation Outsid2. C 0 C to 45 C 1 C 20 C to 0 C 45 C to 60 C Functions Backlight 1 Press the backlight button to toggle the backlight on off at any time during the SRH3 s use Note The back light will automatically shut off after 1 minute to conserve battery life Maximum Minimum Hold 1 Pressing the MAX MIN H button activates the Max Min Hold function holding the maximum and minimum measured values until cleared 2 Once the Max Min Hold function has been enabled pressing MAX MIN H cycles between displaying maximum MAX minimum MIN and freezing the current value 3 Press and hold the MAX MIN H button for 2 seconds to erases all stored maximum and minimum values and return to real time measurements Units 1 Press the units button to switch between degrees Fahrenheit and Celsius Battery Check 1 Press and hold the UNIT button for 2 seconds to display the battery life in percentage Output 1 Press the OUTPUT button to perform calculations of Target Superheat and Target Evaporator Exit Temperature after necessary measurements have been entered Relative Humidity Sensor Type Capacitance polymer film Operating environment 32 F to 131 F 0 C to 55 C Range 0 to 100 RH Accuracy 2 5 10 to 90 RH 5 lt 10 RH and gt 90 RH Note Above accuracies stated at 73 4 F 23 C Sensor Response Time 60 seconds typical for 90 of total range Sensor Hystersis 1 RH typical Excursion of 10 to 90 to 10 RH
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4. Fielapiece In Duct Problem Solving Psychrometer OPERATOR S MANUAL Model SRH3 PRESS FOR 1 SECOND RESS 1 SE TO CLI Psychrometer Fieldpiece ee NLL SRH3 How to Use Normal Mode Normal mode allows you quickly and easily take real time dry bulb wet bulb dew point and relative humidity measurements 1 Press TSH TEET NORM button until NORM is displayed in lower left corner 2 For upper display measurements press the RH DP WB button to toggle relative humidity dew point or wet bulb temperature measurements Note Dry bulb air temperature will always show in the lower display Target Superheat Mode Perform a simple Target Superheat test to determine what the superheat should be ona fixed restrictor system Use the target superheat to compare to the actual superheat to determine if a system is properly charged 1 Press TSH TEET NORM button until TSH is displayed in the lower left of the LCD 2 Take a wet bulb measurement at the inlet of the evaporator Generally right before the filter is a good location Drill or punch a 3 8 hole into the return plenum for a measurment depth of up to 24 inches See Figure 1 for recommended return Quick Start 1 Power on your SRH3 by holding the ON OFF button for 1 second 2 Use the TSH TEET NORM button to select NORMAL mode 3 Press the RH DP WB button to cycle between relative humidity dew point and wet bulb temperatur
5. P WB Toggle between Fahrenheit and Celcius UNITS Hold for 2 seconds to display battery percentage Toggles to display Maximum Minimum MAX MINH or Hold the current reading Hold for 1 second to exit and clear stored values ENTER Confirm Selection Outputs calculations for Target OUTPUT Superheat or Target Evaporator Exit Temperature fe if m gt a Toggle to enter Target Superheat TSH TEET NORM Target Evaporator Exit Temp or Normal modes Specifications Telescoping Probe Length Up to 38 inches 97cm Probe Tip Diameter 0 35 inch 9mm Storage temperature 4 F to 140 F 20 C to 60 C 0 to 80 RH with battery removed Temperature Coefficient 0 1 x specified accuracy C lt 18 C or gt 28 C Over range OL or OL is displayed Power Single standard 9 volt battery NEDA 1604 JIS 006P IEC 6F22 Auto Power off after 15 minutes of inactivity if APO is active Battery life 150 hours typical alkaline Low Battery Indication is displayed when the battery voltage drops below the operating level Dimensions 7 9 in H x 2 6 in W x 1 4in D 200mm H x 66mm W x 36mm D Weight Approx 400g including battery Temperature Sensor type Precision thermistor Operating environment 4 F to 140 F 20 C to 60 C Range 4 F to 140 F 20 C to 60 C Resolution 0 1 F 0 1 C Accuracy 1 F 32 F to 113 F 2 F 4 F to 32 F 113 F to 140 F 0 5
6. e of the USA please visit www fieldpiece com for service contact information Fieldpiece Designed in USA MADE IN TAIWAN www fieldpiece com Fieldpiece Instruments Inc 2011 v05 into a gas by absorbing heat from the indoor air The refrigerant stays at the Same temperature and pressure until all the refrigerant evaporates into a gas After the refrigerant becomes a gas it will continue to absorb heat and become superheated at which point its temperature will change The Superheat measurement is the best indication of refrigerant charge level in a fixed restrictor system A TXV EXV system will keep the superheat constant There must be superheat present to ensure liquid does not flood the compressor Superheat measurements are taken on the suction line between the evaporator and compressor The compressor takes this low temperature low pressure slightly superheated refrigerant and compresses it to a much higher temperature and pressure The highly superheated gas enters the condenser and rejects heat into the outside air The refrigerant Wireless Solutions from Fieldpiece ET2W with ACH4 a vith AO with ARH4 E HG3 Multi Channel Wireless Receiver data logging multiple readings at the same time condenses back into a liquid Once all of the gas is condensed into a liquid additional re
7. es 4 The air temperature will always be shown in the lower display and the relative humidity dew point or wet bulb measurementwillbe displayed in the upper display in real time 5 Insert sensor probe into duct for in duct measurements Certifications C Tick N22675 N22675 E c X WEEE RoHS Compliant plenum placement of probe Insert SRH3 probe into the plenum to take the wet bulb measurement Press ENTER to lock in the reading 3 Take a dry bulb air temperature measurement going into the condensor Press ENTER to lock in the reading 4 Press OUTPUT to calculate the target superheat Compare the target superheat to the actual superheat of the system 5 Seal any holes before leaving the jobsite Target Evaporator Exit Temperature Mode Target Evaporator Exit Temperature TEET aka temperature drop or delta T is used to determine if the evaporator is getting the optimum airflow A TEET test can be quickly performed by taking two easy temperature measurements at the return side of the evaporator 1 Press the TSH TEET NORM button until TEET is displayed in the lower left of the LCD 2 Take a wet bulb measurement inside the return plenum Drill or punch a 3 8 hole into the return plenum See Figure 1 for recommended return plenum placement of probe Insert SRH3 probe into the plenum to take the wet bulb measurement Press ENTER to lock in the reading Description With your purchase of the SRH3 you
8. ld be replaced Turn your SRH3 off and replace with 9V battery Auto Power Off Your SRH3 powers off automatically after approximately 15 minutes to lengthen battery life To disable Auto Off hold the button while powering on your SRH3 When disabled APO will not display in upper left of LCD a HOLD am ry e l min a I LI 0 0 0 WIRELESS ENABLED Sp raw LTI7AW Va 59 7 Er a Bo 15SEC Fi A soomv O ca tl UNPLUG A TEST LEADS 30V Co Co max LT17AW w Built in Wireless Limited Warranty This meter is warranted against defects in material or workmanship for one year from date of purchase Fieldpiece will replace or repair the defective unit at its option subject to verification of the defect This warranty does not apply to defects resulting from abuse neglect accident unauthorized repair alteration or unreasonable use of the instrument Any implied warranties arising from the sale of a Fieldpiece product including but not limited to implied warranties of merchantability and fitness for a particular purpose are limited to the above Fieldpiece shall not be liable for loss of use of the instrument or other incidental or consequential damages expenses or economic loss or for any claim of such damage expenses or economic loss State laws vary The above limitations or exclusions may not apply to you SMAN3 Digital Manifold w Micron Gauge SMAN3 is the most advanced
9. moval of heat causes a temperature drop that is known as subcooling TXV EXV systems are charged to subcooling since superheat is controlled by the throttle valve Subcooling measurements are taken on the liquid line between the condenser and TXV EXV Finally the subcooled liquid enters the restrictor and the cycle starts again EVAPORATOR THROTTLE VALVE REFRIGERANT FLOW COMPRESSOR ET2W w ARH4 transmitting wirelessly to EH4W Maintenance Clean the exterior with a dry cloth Do not use liquid Sensor Care When not in use it is best to protect this sensors with the vinyl slip cover included with the SRH3 Extreme conditions or exposure to solvent vapors may offset the RH sensor If this happens place the sensor ina controlled envrionment of 75 RH and between 68 F 86 F for a period of 24 hours To create a 75 RH environment moisten a small amout of table salt in an open container such as a clean 2 liter bottle cap Place the container with the salt solution and the SRH3 probe in a sealable plastic bag and leave the bag in a room temperature location where it will not be disturbed for 24 hours Note It is important that the salt solution does not come in direct contact with the sensor as this may permenantly damage the sensor HG3 w Multi Channel Wireless le ae Pe A iat le CONNECT ONLY TO ACCESSORY HEAD Battery Replacementwhen the meter displays the battery shou
10. now have the ability to take supply return temperature RH wet bulb and dew point measurements from inside the duct or plenum Your SRH3 is a portable hand held diagnostic psychrometer designed for the HVAC R technician SRH3 helps you properly charge a fixed restrictor system by quickly determining the Target Superheat TSH Your SRH3 can also help determine optimum airflow across the evaporator by easily performing a Target Evaporator Exit Temperature TEET test The 38 96cm telescoping probe with laser etched ruling and flattened edges allows you to locate proper measurement points within a duct and ensures that your probe is properly aligned The dual display with a bright backlight rugged rubber boot with probe clips make sure the SRH3 is ready for any job 3 Take a dry bulb measurement at the same place the previous wet bulb measurement was taken Press ENTER to lock in the reading 4 Press OUTPUT to calculate the target evaporator exit temperature Compare this calculated target to the actual evaporator exit temperature 5 Take a dry bulb measurement inside the supply plenum to check the actual Evaporator Exit Temperature See Figure 1 for recommended supply plenum placement of probe Drill or punch a 3 8 hole into the supply plenum Press TSH TEET NORM until NORM is displayed Insert SRH3 probe into the plenum and read the temperature in the lower display 6 Seal any holes before leaving the jobsite No
11. te For both Target Superheat and Target Evaporator Exit Temperature modes you can adjust any temperature measurement after calculations have been performed by pressing ENTER This prompts you to re take the measurements RCONE1 Probe Lock Use the RCONE1 to lock your sensor probe in place inside the duct Using the RCONE1 and magnet on the SRH3 allows you hands free in duct testing See Figure 2 WARNING Do not retract the sensor probe by pulling on the cord Doing so may sever the cord from the sensors OOOC 0 norm 009 00 09 APO Auto Power Off Enabled Low Battery Indicator RH Relative Humidity DP DewPoint WB Wet Bulb DB Dry Bulb RH Relative Humidity OD Outdoor ID Indoor TSH Target Superheat TEET _TargetEvaporator Exit Tem perature NORM Normal Range F Temperature Fahrenheit C Temperature Celsius HOLD Hold Display MAX Maximum Display MIN Minimum Display Figure 1 Recommended Hole Placement for Supply Plenum Measurements Recommended Hole Placement for Return Plenum Measurement is directly before the evaporator coil Look behind the panel before drilling and make sure you do NOT drill a hole through any critical HVAC compo nents Controls ON OFF Hold 1 second to toggle power on off whe Toggle Backlight Hold while powering u your SRH3 on to disable APO Toggle display to show relative humidiy dew point and wet bulb temperatures RH D
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