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Fieldpiece
ASH3
Superheat Head
R22 and R410A
with thermocouple
OPERATOR’S MANUAL
Description
The model ASH3 superheat accessory head
measures refrigerant pressure and temperature
simultaneously. It then calculates and displays
superheat. It has a 1/4” industry standard fitting for
actual pressure. A pipe clamp thermocouple is
included for temperature. Select R22 or R410A.
Select english or metric units.
Use it your way
EHDL1 AHDL1 w/ Meter DL2 HS30
How to use
1. Connect to COM and Volts jack. Slide ASH3
superheat head onto Fieldpiece "stick" meter,
data logger, 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 as close to
the evaporator as possible using an EPA
approved service hose (not included).
5. Select refrigerant (R22 or R410A) and units
(English or metric).
6. Connect the pipe clamp to the suction line at
least six inches from the compressor 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, pres-
sure, or temperature).
8. You must wait until the system you are testing
has stabilized completely before you can take
an accurate superheat reading, this usually
takes about 10-15 minutes. The STABLE LED
lights when superheat is stable.
9. Disable Auto-off to data log any of the above
parameters with the DL2 data logger.
10. Once you have the superheat reading follow
the manufacturer of the air conditioner’s specifi-
cations to properly charge or diagnose the sys-
tem.
Field calibration
Temperature:
To calibrate the system (ASH3, pipe
clamp thermocouple, meter), adjust the calibra-
tion pot underneath the rubber covering while
measuring a known temperature. Ice water is
very close to 32°F and is readily available.
1. Stabilize a large cup of ice water.
2. Select temperature on ASH3, plug in the pipe
clamp thermocouple and then immerse entire
clamp into the ice water.
3. Adjust the calibration pot to read 31.3 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
readings of something other than zero without
your service hose attached, you need to set
atmospheric pressure before connecting the
ASH3 to the system. To set atmospheric pres-
sure, press the button underneath the rubber
covering entitled “Set ATM”. You usually have to
set atmospheric pressure each time you dra-
matically change elevations. For example, if you
“Set ATM” in Denver and take a pressure read-
ing of an A/C system in Los Angeles, the pres-
sure reading in Los Angeles will be lower than it
actually is.
SPECIFICATIONS
Operating environment:
32ºF to 122ºF; 0ºC to
50ºC at <75%RH
Allow ~5 min. for ASH3 to come to ambient temp.
Storage environment:
-4ºF to 140ºF; 0ºC to 50ºC
at <80%RH with battery removed from meter.
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 ASH3 outputs 3.4V when temper-
ature or pressure is outside of their working
range (overloaded). For ranges below
3400mVDC, the normal overload symbol will be
displayed on the meter (“OL” or depending in
the meter). For ranges above 3400mVDC, read-
ing displayed will be approximately 3.4VDC.
Pressure and vacuum
Working range (pressure):
0 to 500 psi; 0 to 4000 kPa
Maximum displayed pressure:
800psi
Working range (vacuum):
29”Hg vac. to 0; 74cmHg vac. to 0
Vacuum will show up as negative value on meter.
Resolutions:
0.1psi, 0.1”Hg vac.
Accuracy:
@ 50°F to 115ºF ambient, ±1 psi, ±6.9 kPa
@ 32ºF to 122ºF ambient, ±2 psi, ±13.8 kPa
Sensor breakdown pressure:
1300psi
Temperature
Range (temperature):
-40ºF to 400ºF;
-40ºC to 204ºC
Resolutions:
0.1º
Sensor type:
k-type thermocouple
Pipe clamp thermocouple accuracy:
±4ºF or
±0.75%, whichever is greater, -30ºF to 200ºF
System accuracy:
±1ºF; ±0.06ºC @ 73ºF ± 5ºF
after ice water calibration (see Field calibration).
Superheat
Range (temperature):
0ºF to 80ºF; 0ºC to 27ºC
Resolutions:
0.1º
System Accuracy:
±1ºF; ±0.06ºC @ 73ºF ± 5ºF
after calibration (see Field calibration).
One year limited warranty
This head is warranted to the original purchaser
against defects in material and workmanship for a
period of one year from the date of purchase.
During the warranty period, Fieldpiece will replace
or repair the defective unit, subject to verification of
the defect.
Any damage to the sensor from dirt, mechanical
abuse, or overexposure to damaging chemicals,
including overexposure to carbon monoxide, are
not covered under this warranty. Also not covered
are defects resulting from abuse, neglect, accident,
unauthorized repair, alteration, or unreasonable
use.
ANY IMPLIED WARRANTIES ARISING OUT OF
THE SALE OF A FIELDPIECE INSTRUMENT
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 OR
CLAIMS FOR SUCH DAMAGE, EXPENSES, OR
ECONOMIC LOSS.
Local laws vary. Above limitations or exclusions
may not apply to you. This warranty gives you spe-
cific legal rights, and you may also have other rights
which vary by location.
Obtaining service
Check the battery, then call Fieldpiece for an
RMA# and send freight prepaid to Fieldpiece.
For warranty service, include proof of purchase
date. For out of warranty service, include a check or
money order for $65 (ASH3 head), or $30 (ATC1
pipe clamp thermocouple). We will pay for the ship-
ping to you using the same method (ground, air,
next day, etc.) used to ship product to us.
Fieldpiece Instruments, Inc.
580 West Central Ave. Suite A
Brea, CA 92821
Phone: (714) 257-9060 Fax: (714) 257-9069
www.fieldpiece.com
