Fieldpiece SMAN320 User Manual
Fieldpiece
LOW HIGH
Digital Manifold
OPERATOR'S MANUAL
Model SMAN320
Quick Start
1 Install six AA batteries into rear battery com-
partment. Batteries included in packaging.
2 Press the center blue button for 1 second to
turn on your new manifold.
3 Connect hoses and ATB1 thermocouples to
the manifold and the system.
4 See all your pressure and temperature mea-
surements in real-time all at once!
Certifications
C-Tick (N22675)
CE
RoHS Compliant
Description
Your SMAN320 is a handy two-valve Digital
Manifold for HVACR professionals. See all your
pressures and temperatures at the same time
on the redesigned large display with bright
blue backlight.
SMAN320 combines high precision, absolute
pressure sensors, a superheat/subcooling
calculator, and dual temperature measurements.
Your SMAN320 calculates and displays target
superheat and actual superheat to verify proper
charge.
SMAN320 is designed to meet the demands
of HVACR eld service with a rugged rubber
boot for durability, a strong metal hanger for
easy storage. SMAN320 has a very intuitive user
interface and long battery life.
Your SMAN comes pre-programmed with
the most accurate P-T charts for 45 of the most
common refrigerants in the field so you are
always prepared for any job.
Pressure (bar)
Pressure (pounds/in2)
Pressure (kilopascals or Megapascals)
Negative Pressure (inches of mercury)
Negative Pressure (cm of mercury)
Suction Line Temperature
Liquid Line Temperature
Vapor Saturation Temperature
Liquid Saturation Temperature
Superheat
Subcooling
Target Superheat
Static Target Superheat Calculation
Outdoor Dry Bulb
Indoor Wet Bulb
Battery Life
Auto Power O Enabled
Selected Refrigerant of System
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Controls
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1 Insert Type K thermocouple plugs here.
2 Temperature calibration pots.
3 Press to zero atmospheric pressure.
4 Press to calibrate to refrigerant tank.
(See Advanced Pressure Calibration section.)
5 Press to conrm selection.
6 Press/hold to cycle through refrigerants.
7 Press to enter Target Superheat mode.
8 Press to scroll up/down to adjust values.
9 Press to adjust units.
10 Hold 1 second to power on or o. Press to toggle backlight.
11 Turn clockwise to close High side port.
12 Turn clockwise to close Low side port.
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Functions
Superheat and Subcooling
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Your SMAN320 calculates and displays both superheat and
subcooling simultaneously.
1 Select the appropriate refrigerant using the REFRIGERANT button.
2 Connect EPA approved refrigerant hoses to low and high side on
SMAN320. Plug Type K ATB1 thermocouples into SLT and LLT.
3 Connect your SMAN320 to the system:
Superheat: Hand tighten low side hose to suction line service
port. Place the SLT ATB1 thermocouple on the suction line with
Velcro strap between the evaporator and compressor, no closer
than 6 inches to compressor.
Subcooling: Hand tighten high side hose to liquid line service
port. Attach the LLT ATB1 thermocouple on the liquid line with
Velcro strap between the condenser and expansion valve (TXV), as
close to the service port as possible.
4 After turning the system on or making any adjustments to
the system wait 15 minutes before charging by superheat or
subcooling to ensure the system is stabilized.
5 To add or remove refrigerant connect a refrigerant or recovery
tank to the center port on SMAN320. Follow charging or recovery
practices from manufacturer. Use the low side and high side
valves on SMAN320 to charge or recover refrigerant as needed. Let
system stabilize again for 15 minutes.
Note: When superheat and/or subcooling cannot be calculated an
"OL" or "-OL" will be displayed. Please check the following:
1 The correct refrigerant is selected on the SMAN.
2 The pipe thermocouples are plugged into SLT/LLT ports and are in
good working condition.
3 The pipe thermocouples are attached in the appropriate location on
the system. See step 3 above for details.
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03
Target Superheat
Target Superheat is useful for charging xed orice air conditioning
systems. Your SMAN will calculate the target superheat for you. Just
manually input the IDWB (indoor wet bulb) and ODDB (outdoor dry
bulb) temperatures into the SMAN.
Input IDWB and ODDB manually
1 Press Target SH button to enter Target SH mode. IDWB will begin
blinking indicating it is ready for an input.
2 Press UP or DOWN ARROW to toggle between IDWB or ODDB
input. Hold ENTER to select which temperature you want to input
rst, either IDWB or ODDB. The far left digit of IDWB or ODDB will
begin blinking indicating manual input mode is ready.
3 Press the UP or DOWN ARROW to change values and press ENTER
to lock in each digit. Once the last digit for ODDB or IDWB is locked
in, the calculated target superheat will show in the center column
of the display. A solid HOLD will display to the left of the TSH
calculation indicating a static target superheat calculation.
Note: If the inputted temperature is out of the calculable range for
IDWB or ODDB an "Err" will ash once and a double beep will
sound. IDWB range (40°F to 125°F, 4.4°C to 51.7°C) and ODDB
range (50°F to 140°F, 10°C to 60°C). Re-input a temperature
within these ranges to calculate target superheat.
Changing Units
Your SMAN can display pressure and temperature measurements in
English, Metric or combination of both units.
1 Press UNITS to enter unit selection screen.
2 Use ARROW to select your desired pressure units. Press ENTER.
3 Use ARROW to select your desired temperature units. Press ENTER
to return to pressure units.
4 Press UNITS to return to normal SMAN display.
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Specifications
Display size: 5 inches (diagonal)
Backlight: Blue (On for 3 minute unless turned o manually)
Mini-USB Port: For updating to latest version of rmware.
Battery: 6 x AA (Battery life below based on alkaline type)
Battery life: 350 hours (without backlight)
Low battery indication: is displayed when the battery
voltage drops below the operating level
Auto Shut o: 30 minutes of inactivity when APO is activated
Operating environment: 32°F to 122°F (0°C to 50°C) at <75%
relative humidity
Storage temperature: -4°F to 140°F (-20°C to 60°C), 0 to 80% RH
(with battery removed)
Temperature coecient: 0.1 x (specied accuracy) per °C (0°C to
18°C, 28°C to 50°C), per 0.6°F (32°F to 64°F, 82°F to 122°F)
Over range: "OL" or "-OL" is displayed
Weight: 3.04 lbs (1.38 kg)
Pressure
Connector Type: Standard 1/4" NPT male are tting
Range: 29” HgV to 580 Psig (English), 74 cmHgV to 0 to 4000KPa
(Metric)
Resolution: 0.1 psi/inHg; 1 kPa/cmHg
Accuracy: 29” HgV to 0” HgV: ±0.2” HgV
74 cmHgV to 0 cmHgV: ±1 cmHgV
0 to 200 Psig: ±1 Psi; 0 to 1378 KPa: ±7 KPa; 0 to 1.378MPa:
±0.007MPa; 0 to 13.78 bar ±0.07 bar
200 to 580 Psig: ±(0.3% of reading+1 Psig); 1378 to 4000KPa: ±(0.3% of
reading+7 Kpa); 1.378 to 4.000MPa: ±(0.3% of reading+0.007MPa);
13.78 to 40.00bar: ±(0.3% of reading +0.07bar)
Maximum overload pressure: 800 psig
Units: Psig, kPa, MPa, bar, inHg, and cmHg
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Temperature
Sensor type: Type K thermocouple
Range: -95°F to 999.9°F (-70°C to 537.0°C)
Resolution: 0.1°F/°C
Accuracy: ±(1.0°F) -95°F to 199.9°F; ±(0.5°C) -70°C to 93°C
±(2.0°F) 200°F to 999.9°F; ±(1.0°C) 93°C to 537.0°C
Note: All accuracies are after a eld calibration.
Maintenance
Clean the exterior with a dry cloth. Do not
use liquid.
Battery Replacement
The battery must be replaced when the
battery life indicator is empty. SMAN will
display "lo batt" and power o. Remove rear
battery cover and replace with 6 AA batteries.
Auto Power O (APO)
To conserve battery life, your SMAN will
power down after 30 minutes of inactivity. APO
is activated by default and APO displays above
the battery icon. To deactivate, press and hold
ENTER while powering on the SMAN. When
deactivated, APO will no longer show above
the battery icon.
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What is Superheat and Subcooling?
!
Why Do I Need to Measure It?
Superheat is the difference between the
actual temperature of the refrigerant (gas) as
it leaves the evaporator and the boiling point
of the refrigerant. After boiling, the refrigerant
continues to heat up. The number of degrees it
“heats up” after boiling is called the superheat.
Under worst case conditions (low load for xed
orice systems), the refrigerant in the evaporator
boils o near the end of the evaporator coil. To
make sure liquid doesn’t enter the compressor
under the worst case condition (low load),
the refrigerator or A/C 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 working properly and the
actual superheat is too high, add refrigerant. If
it’s too low, evacuate refrigerant.
Subcooling is the dierence between the
boiling point of the refrigerant in the condenser
and the actual temperature of the refrigerant
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as it leaves the condenser. The degrees that the
refrigerant “cools down” below the boiling point
is the subcooling. Under worst case scenario
(low load for TXV) the subcooling will continue
to rise. If the subcooling rises too high, liquid
may be backed into the compressor causing
damage and catastrophic failure. See www.
eldpiece.com for more technical articles.
Evaporator
Low Side
TXV
High Side
Condenser
Location of Subcooling Test
Location of Superheat Test
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Direction of
Refrigerant
Flow
Compressor
Refrigerants
The P-T charts of the following 45 refrigerants come preprogrammed into your SMAN. In your SMAN the refrigerants are listed
in order of most commonly used. Here, they are listed in numerical
order for easy reference.
R11, R113, R114, R12, R123, R1234YF, R124, R125, R13, R134A, R22,
R23, R32, R401A(MP39), R401B, R402A, R402B, R404A, R406A, R407A,
R407C, R407F, R408A, R409A, R410A, R414B (Hotshot), R416A, R417A,
R417C (HOT SHOT 2), R420A, R421A, R421B, R422A, R422B(NU22B),
R422C(Oneshot), R422D, R424A, R427A, R434A(RS-45), R438A(MO99),
R500, R502, R503, R507A, R508B (Suva95)
Using Dierent Refrigerants
You can use your manifold with dierent refrigerants. Be sure to
purge your manifold and hoses before connecting to a system with a
dierent refrigerant.
Firmware Updates
Your SMAN320 rmware can be updated in the eld to ensure you
always have the most up-to-date features for your manifold. Just go
to www.eldpiece.com to periodically check for the latest rmware
version. If a newer version is available, follow the download link and
installation instructions on the website. Connect your SMAN320 to the
PC via a mini-USB to USB cable (not included) to install the update on
your SMAN.
To check your current rmware version, power o your SMAN320.
Press and hold the blue power button for about 6 seconds. The SMAN320
rmware version will show in the top right corner of the display (X.XX).
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Recommended
Accessories
Easy View Micron Gauge
Model SVG3
Measure the depth of the vacuum in microns
of mercury to verify all moisture and noncondensibles have been removed from the
system. For the most accurate reading, connect
directly to a service port on the system or to a
Schrader core removal tool (illustrated below).
MIN
MICRONS OF MERCURY
CUUM
UE
ALARM
ENTER
S
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Hose
To
Pump
Schrader Core
Removal Tool
Directly to
Service Port
Pipe Clamp Thermocouple
Model ATC1
Measure suction line and liquid line pipe
temperatures quickly and easily. Using a pipe
clamp thermocouple makes it easy to check the
superheat and/or subcooling of the system to
verify proper charge.
ATC1 SENSOR
PIPE
EXAMPLE OF PROPER PLACEMENT
OF FIELDPIECE ATC1 PIPE CLAMP
THERMOCOUPLE ON HORIZONTAL
REFRIGERANT PIPE
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HORIZONTAL AXIS
PIPE
Calibration
Temperature
To calibrate your SMAN temperature
thermocouples, adjust the pot on the front
of the meter labeled SLT Cal or LLT Cal. The
best way to calibrate is to match to a known
temperature. Ice water is very close to 32°F and
is readily available. Accuracies of one degree or
better are easily obtained.
1 Stabilize a large cup of ice water by stirring. Pure, distilled water
will be the most accurate.
2 Immerse the temp probe in ice water from SLT and adjust the
SLT Cal pot with a athead screwdriver and let it stabilize, keep
stirring.
3 Repeat Step 3 for temp probe in LLT.
Pressure Zeroing
To calibrate your SMAN320 pressure sensors
to atmospheric pressure, ensure that your
SMAN320 is disconnected from any pressure
source and at equilibrium with the ambient
pressure.
1 Press the CAL Atmospheric Pressure button and your SMAN320
will set the zero point of pressure to the ambient pressure.
Advanced Pressure Calibration
Your SMAN320 has the ability to perform a
linear adjustment of the pressure sensors based
on refrigerant type, temperature, and pressure.
Calibration setup: For best results, rst perform both the
Temperature and Pressure Zeroing procedures. See Calibration
section for details. This will ensure pressure readings are zeroed
and thermocouple is properly calibrated to the SLT port of the
SMAN. Calibration to LLT port is not necessary for this calibration.
The refrigerant cylinder should be stored in a stable ambient
environment for at least 24 hours before calibration.
1 Plug in a Type K thermocouple into SLT. (A bead type
thermocouple, like the ATB1, is recommended.)
2 Connect the SMAN320 to a refrigerant cylinder of a known,
single refrigerant using an EPA approved service hose. Be sure
to open both HIGH and LOW side valves on your manifold and
cap the unused ports. (If caps are not available you can connect
both ends of a refrigerant hose to the two unused caps. Note:
Some refrigerant will remain in the hoses which will need to be
recovered.)
3 Press the REFRIGERANT button to match the refrigerant of the
cylinder you are using.
4 Attach bead-type thermocouple to the side of the cylinder using
tape. It is recommended to attach in the middle of the cylinder.
Important: Let the temperature of the thermocouple stabilize to
the refrigerant temperature for 1 to 2 minutes or until stable.
5 Open the refrigerant cylinder. The pressure inside cylinder should
now be displayed on both HIGH and LOW side pressure sensors.
6 Press the CAL Test Pressure button. If successful, "Good" will
display for 3 seconds. If failed, "Err" will display for same time.
Your SMAN checks with its built-in P-T charts to compare the
temperature of the refrigerant in the tank to the vapor saturation
temperature based on the refrigerant you selected. If the measured
pressures on your SMAN are within ±3psi of the P-T chart pressure
corresponding to the vapor saturation temperature, the SMAN will
adjust the pressure sensor linearity to match the P-T chart.
Possible causes of failed "Err" pressure calibration:
1. Refrigerant tank was not stored in stable ambient conditions for at
least 24 hours.
2. Thermocouple attached to refrigerant tank was not properly
calibrated to SLT port of SMAN.
3. Thermocouple was plugged into wrong port LLT instead of SLT.
4. Incorrect refrigerant was selected on the SMAN.
WARNINGS
DO NOT APPLY MORE THAN 800 PSI TO ANY PORT ON THE MANIFOLD.
FOLLOW ALL EQUIPMENT MANUFACTURER'S TESTING PROCEDURES
ABOVE THOSE IN THIS MANUAL IN REGARDS TO PROPERLY
SERVICING THEIR EQUIPMENT.
Limited Warranty
This meter is warranted against defects
in material or workmanship for one year
from date of purchase from an authorized
Fieldpiece dealer. Fieldpiece will replace or
repair the defective unit, at its option, subject
to verication 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
tness 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.
Obtaining Service
Email Fieldpiece warranty department at
fpwarranty@eldpiece.com for current xed
price repair service. Send check or money
order made out to Fieldpiece Instruments for
the amount quoted. If your meter is under
warranty there will be no cost for the repair/
replacement. Send your 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.
For international customers, warranty for
products purchased outside of the U.S. should
be handled through local distributors. Visit our
website to nd your local distributor.
www.fieldpiece.com
© Fieldpiece Instruments, Inc 2014; v05
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