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Opman ASX14 v07.qxd - Fieldpiece Instruments
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1. Under worst case scenario low load for TXV the subcooling will continue to rise If the subcooling rises to high liquid may be backed into the compressor causing damage and catastrophic failure On TXV systems subcooling is the best indica tion of the state of charge in the refrigerant system since these systems are designed to maintain con stant superheat Properly charging a system ensures maximum efficiency and longer equipment life The hose must have a schraeder valve depress er on one end to release the refrigerant from the suction or liquid line This is the same type of hose available with most pressure gauge sets We sug gest EPA sanctioned no leak hoses Exercise caution whenever working with any electricity and high pressure liquid or gas Follow all instructions provided with equipment being serviced or installed Target superheat and subcooling Heed all equipment manufacturer s specifica tions warnings and suggestions above anything found in this manual To determine the target superheat fixed orifice system or subcooling charts vary dramatically from one system to another you will typically need three things Outdoor dry bulb outdoor air temper ature indoor wet bulb and the manufacturers tar get superheat chart or subcooling chart You can use the ARH4 Fieldpiece accessory Condenser Air Dry Bulb Entering Tem
2. 2 16 2 18 1 7 7 9 7 114 7 13 7 15 7 17 7 49 7 4 9 1 11 2 43 2 15 3 17 3 42 65 86 10 7 127 148 16 9 3 4 5 9 8 0 10 1 12 3 14 4 16 5 53 7 4 9 6 11 8 13 9 16 1 _ 47 69 9 4 11 3 13 5 15 7 41 63 86 10 8 13 1 15 4 _ 3 5 5 7 8 0 10 4 12 7 15 0 29 52 75 99 123 146 4 6 7 0 9 4 11 8 14 3 41 65 90 11 4 13 9 42 2 44 6 41 3 43 7 40 4 42 9 39 4 42 0 38 5 41 2 37 6 40 3 36 7 39 5 9 35 9 38 7 35 0 37 9 5 34 1 37 4 w 23 3 33 3 36 3 o 32 4 35 6 25 6 31 6 34 8 o 30 7 34 0 e 278 29 9 33 3 29 1 32 6 30 0 28 3 31 8 31 1 27 5 31 1 wi 32 2 26 7 30 4 2 25 9 29 7 5 34 4 25 1 29 0 Q 24 3 28 3 D 36 7 23 6 27 7 a 22 8 27 0 38 9 22 1 26 3 21 3 25 7 g lara 20 6 25 1 5 422 19 9 24 4 ne 19 1 238 5 18 4 23 2 oO rs gt A Se 3 6 6 0 8 5 11 0 13 6 3 0 55 8 1 106 13 2 TS s o 7 6 10 2 12 9 i Compressor Throttle Valve TXV Cap tube Fixed Orifice Checking Superheat Using the ASX14 These charts are an example of a generic superheat charts for a typical fixed orifice split res idential system These charts should not be used for charging A typical manufacturer s recommend ed subcooling is 12 F 7 C These are only exam ples of what the m
3. Superheat and Subcooling Head for R22 and R410A with pipe clamp thermocouple Model ASX14 Air Conditioner Superheat and Subcooling 28T O Roz sh ENGLISH HOA SC Ra mi SH or SC mq Temp Pressure m OFF i Tie fo amo ca AUTO VETA Fieldpiece T ASRI Fieldpiece LO NLL OPERATOR S MANUAL SPECIFICATIONS Operating environment 32 F to 122 F 0 C to 50 C at lt 75 RH Allow 5 min for ASX14 to come to ambient temp Storage environment 4 F to 140 F 20 C to 60 C at lt 80 RH with battery removed Battery life 25 hours typical No measurable current draw when in off position Low battery indication Red LED lights Battery 9V Auto off Approx 15 minutes Overloads The ASX14 outputs 3 4V when tem perature or pressure is outside of their working range overloaded For ranges below 3400mVDC the normal overload symbol will be displayed on the meter OL For ranges above 3400mVDC reading displayed will be approximately 3 4VDC Stated Accuracy at 73 F 9 F 23 C 5 C lt 90 R H Temperature Range temperature 40 F to 400 F 40 C to 204 C Resolutions 0 1 Sensor type k type thermocouple Pipe clamp thermocouple accuracy 4 F 42 C or 0 75 whichever is greater 30 F to 200 F 34 C to 93 C System accuracy 1 F 0 06 C 73 F 5 F Description The model ASX14 superheat and subc
4. anufacturer s may recommend Heed all manufacturer s indications instructions and warnings above those in this manual The indoor wet bulb measurement can be accomplished by a Fieldpiece ARH4 or ATWB1 and should be taken as close to the evaporator coil inlet as possible The outdoor dry bulb reading can be taken with an ARH4 ATB1 ATA1 or any other Fieldpiece air thermocouple and should be taken as close to the condenser air inlet as possible Fieldpiece Designed in USA MADE IN TAIWAN
5. ece s products including but not limited to implied warranties of merchantability and fitness for purpose are limited to the above Fieldpiece shall not be liable for incidental or con sequential damages Service Return any defective ASX14 to Fieldpiece for warranty service along with proof of purchase Contact Fieldpiece for out of warranty repair charges Field calibration Temperature To calibrate the system ASX14 pipe clamp thermocouple meter adjust the cali bration pot underneath the rubber covering while measuring a known temperature Ice water is 32 F 0 C and is readily available 1 Stabilize by repeated stirring a large cup of ice water 2 Select temperature on ASX14 plug in the pipe clamp thermocouple and then immerse entire clamp into the ice water keep stirring 3 Adjust the calibration pot to read 32 0 0 0 if using C on the DMM for optimum accuracy at room temp Pressure The pressure vacuum reading prior to connecting to an A C system should always be zero If you see that you re getting pressure read ings of something other than zero without your serv ice hose attached you need to set atmospheric pressure before connecting the ASX14 to the sys tem To set atmospheric pressure press the button underneath the rubber covering entitled Set ATM You usually have to set atmospheric pressure each time you dramatically change elevations For exam ple if you Set ATM in Denver and ta
6. ke a pressure reading of an A C system in Los Angeles the pres sure reading in Los Angeles will be lower than it actually is Fieldpiece Designed in USA MADE IN TAIWAN v07 Measuring actual superheat and subcooling Superheat is the difference between the actual temperature of the refrigerant gas as it leaves the evaporator and the boiling point temperature of the refrigerant in the evaporator coil After boiling the refrigerant continues to warm up The number of degrees it warmed up after boiling is called the superheat Under worst case conditions low load for fixed orifice systems the refrigerant in the evap orator boils off near the end of the evaporator coil To make sure liquid doesn t enter the compressor under the worst case condition low load the AC manufacturers publish charts indicating what the superheat should be at a given indoor wet bulb measurement and outdoor air temperature Measuring superheat is your best indication on a fixed orifice system of the proper refrigerant charge and operating conditions If everything else is work ing properly and the actual superheat is too high add refrigerant If it s too low remove refrigerant Subcooling is the difference between the boiling point of the refrigerant in the condenser and the actual temperature of the refrigerant as it leaves the condenser The degrees that the refrigerant cools down below the boiling point is the sub cooling
7. ooling accessory head measures refrigerant pressure and temperature simultaneously It then calculates and displays superheat or subcooling It has a 1 4 industry standard fitting for actual pressure A pipe clamp thermocouple is included for temperature Select R22 or R410A Select superheat or subcool ing Select english or metric units Use it your way EHDL1 AHDL1 w Meter after ice water calibration see Field calibration Pressure and vacuum Working range pressure 0 to 500 psi 0 to 4000 kPa Max displayed pressure 800psi 5500 kPa Working range vacuum 29 Hg vac to 0 74cmHg vac to 0 Vacuum will show up as negative value on meter Resolutions 0 1psi or kPa 0 1 Hg or cmHg vac Accuracy 0 to 200 psig 1 psi 0 to 1378 kPa 6 9 kPa 200 to 500 psig 0 3 1 psi 1378 to 3447 kPa 0 3 6 9kPa Sensor breakdown pressure 800psi 5500 kPa Superheat Range temperature 0 F to 80 F 0 C to 27 C Resolutions 0 1 System Accuracy 1 F 73 F 5 F 0 06 C 23 C 3 C after calibration see Field cali bration Subcooling Range temperature 0 F to 80 F 0 C to 27 C Resolutions 0 1 System Accuracy 1 F 73 F 5 F 0 06 C 23 C 3 C after calibration see Field cali bration How to use 1 Connect to COM and Volts jack Slide ASX14 superheat head onto Fieldpiece stick meter data logge
8. perature F head for both indoor wet bulb and outdoor dry bulb Or you can use any Fieldpiece meter that has a temperature function along with a ATWB1 wet bulb thermocouple Below is a diagram of the ASX14 on a split system residential A C unit Checking Subcooling Using the ASX14 F LL M Generic Target Superheat Charts Target Superheat F Return Air Wey Bulb Temperature Em eoj 52 5a Sst Se eoj 62t E4 8S Sal 70l T21 74 Z8 Target Superheat C Return Air Wey Bulb Temperature 10 0 11 1 12 2 13 3 14 4 15 6 16 7 17 8 18 9 20 0 21 1 22 2 23 3 24 4 13 3 4 8 6 2 7 8 9 3 10 9 12 6 14 3 16 0 17 7 19 2 20 7 22 1 23 4 24 8 14 4 4 4 5 9 7 4 9 0 10 5 42 1 13 8 15 4 17 1 18 6 20 1 21 5 22 9 24 3 15 6 3 9 5 4 7 0 8 5 10 1 11 7 13 2 14 8 16 4 18 0 19 5 21 0 22 4 23 8 16 7 3 3 4 9 6 5 8 0 9 6 41 1 12 7 14 2 15 8 17 4 18 9 20 4 21 9 23 3 17 8 42 5 9 7 5 9 0 10 6 12 1 13 5 15 2 16 8 18 4 19 9 21 4 22 9 118 9 3 5 5 2 6 8 8 4 10 0 11 5 12 9 14 5 16 2 17 8 19 4 20 9 22 4 ED a EOE 17 2 18 8 20 4 22 0 16 1 17 8 19 4 21 1 ast ssl ral eal waltz 39 teal 7al tool 208 46 65 8 2 9 6 11 4 13 2 15 0 16 7 18 5 20 2 O EO 12 6 14 4 16 2 18 0 19 8 10 2 12 0 13 9 15 7 17 5 19 3 ea ae aa 9 5 11 4 13 3 15 2 17 1 18 9 69 89 10 9 12 8 14 7 16 6 18 5 _ 4 3 6 3 8 3 10 3 12 3 14
9. r electronic handle or connect to most other meters using Fieldpiece ADLS2 deluxe test leads or AHDL1 handle 2 Set meter to mVDC range 3 Calibrate if needed see Field calibration 4 Hand tighten 1 4 flare to suction line or liquid line as close to the evaporator or condenser as possible using an EPA approved service hose not included 5 Select superheat or subcooling refrigerant R22 or R410A and units English or metric 6 Connect the pipe clamp to the suction super heat or liquid subcooling line at least six inch es from the condenser and slide it under the insulation for best accuracy isolating the pipe clamp from the ambient air pg 2 7 Select parameter to display superheat sub cooling pressure or temperature 8 You must wait until the system you are testing has stabilized The STABLE LED lights when the reading is stable 9 Disable Auto off to data log any of the above parameters with the DL3 data logger 10 Once you have the superheat or subcooling reading follow the manufacturer of the air condi tioner s specifications to properly charge or diagnose the system Warranty The ASX14 Superheat and Subcooling accesso ry head is warranted against manufacturer s defects for one year This warranty does not apply to defects resulting from abuse neglect accident unauthorized repair alteration or unreasonable use of the instrument Any implied warranty arising out of the sale of Fieldpi
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