Fieldpiece HG3 User manual

1
Model HG3
Field Manual

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2 3
HVAC Guide® System Analyzer
Field Manual
Model HG3
Do it right the rst time!
e HVAC Guide®System Analyzer will reduce call-backs by giving you
a wide variety of tests to diagnose HVACR systems and lower your customer's
energy bills. It walks you step-by-step through each test procedure to make
your job easier, faster and better.
e New HG3 model has wireless capabilities. Set up the Fieldpiece Ac-
cessory Heads at multiple locations on the system with the wireless trans-
mitters (products ET2W or EH4W) and have all of the measurements and
calculations in the palm of your hand!
Test procedures are included for Superheat, Subcooling, Combustion
Analysis, Target Evap Exit Temperature (temperature drop across the evapo-
rator coil), CFM (air balancing), CheckMe!®Evaluation and Service light set
up are built into the HVAC Guide to streamline each test. You select a test
on the dial, enter data on the INPUT FORM and view the results on the
OUTPUT FORM. Tests can be saved, downloaded to a PC and printed for
customer tracking or to hand back to customers.
e HVAC Guide® System Analyzer also has a data logging switch posi-
tion to record up to 13 measurements at one time. With the Display switch
position view one parameter by connecting any Fieldpiece Accessory Heads
directly or wirelessly.
Do it right the rst time, do it faster, easier, more completely, and avoid
call-backs in the process.
Table of Contents
HVAC Guide®System Analyzer Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Switch Positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
How it Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Inputting Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Wireless Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Example Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
1.1 Target Evaporator Exit Temperature . . . . . . . . . . . . 16
2.1 Superheat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.1 Subcooling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.1 Combustion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.1 CheckMe!® . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
6.1 CFM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
7.1 Service Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
8.1 Data Logger and Display. . . . . . . . . . . . . . . . . . . . . . . 56
Setup Switch Position
Com with PC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
Power Savings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
Version (about). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
Time/Time Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
Advanced Operations
Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
Saving Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
Recalling Saved Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
Contrast Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
Clearing a Single Input for INPUT FORM . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
What's Included . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
Features and Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
Obtaining Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
CheckMe! Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
Accessory Heads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72
K-Type Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
Refrigerants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73

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4 5
HVAC Guide Controls
Clear
Input Sync
Recall
Save
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEADS!
HVAC Guide
Fieldpiece HG3
SETUP
Target
Evaporator
Logger
Light
Exit Temp
CFM
Display
Superheat
SubcoolingCombustion
CheckMe!
Data
Service
b
t
tion
n
S
Su
n
ub
t
Logg
er
Data
InpInp
ay
at
e!
Use the PC cable to transfer
data. Use the DC power input
for extended testing sessions.
PC and Power Inputs
Makes a selection or enters data.
Enter Button
Connects with Fieldpiece Wireless
instruments. Press to lock in a wireless value.
Sync Button
After "POWER OFF" clears, unscrew the two
screws to replace the 6AA batteries.
Battery Cover
Saves the current INPUT FORM. Inputs are
saved with Customer ID and Time Stamp.
See Saving Data section for details.
Save Button
Triggers calculations based on the INPUT
FORM and takes you to the OUTPUT FORM.
Output Button
Recalls previous tests within each switch
position. Previous tests can only be accessed
through the switch position in which they
were performed.
Recall Button
Connect Accessory Heads here.
Input Jacks
Returns to the INPUT FORM.
Input Button
Displays INPUT FORMS and
OUTPUT FORMS.
Dot Matrix LCD Screen
Turns on the backlight for
30 sec.
Backlight Button
Navigates within FORMS
and screens.
Arrow Buttons
Rotates to select test.
Switch Position Dial
Clears a single input or
the entire INPUT FORM by
holding for 3 seconds.
Clear Button

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6 7
Select the TestSwitch Positions
1. Setup: Set current time and date for internal clock. All tests are time
stamped and cannot be changed. Setup memory management, version
verication and connecting to a PC.
2. CheckMe!®: e most advanced A/C system diagnostics and gives sug-
gests for xing problems.
3. Display: Displays readings taken from a Fieldpiece product. Wireless or
direct connection.
4. Superheat: Charge a xed restrictor A/C system by comparing the ac-
tual superheat to the calculated target superheat.
5. Subcooling: Charge a TXV/EXV A/C system using the manufacturer's
target subcooling.
6. Combustion: Use full combustion analysis to set up combustion equip-
ment such as a natural gas furnace.
7. Service Light: Connect to setup the Fieldpiece Service Light.
8. Data Logger: Record up to 13 parameters using Fieldpiece Accessory
Heads. Connect wirelessly or directly.
9. Target Evaporator Exit Temp: Check airow by comparing the ac-
tual evaporator exit temperature to the target evaporator exit tempera-
ture (Target Temp Split).
10. CFM: Calculates the CFM on each grille to balance the airow.
Select a test with the HG3 Dial.
Clear
Recall
Save
SETUP
Target
Evaporator
Logger
Light
Exit Temp
CFM
Display
Superheat
SubcoolingCombustion
CheckMe!
Data
Service
b
t
tion
n
S
S
u
n
t
ub

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8 9
How it Works
Step 1: Select a Test on the Dial
Select the test on the dial that you want to perform.
Step 2: Enter Data on the INPUT FORM
e INPUT FORM is displayed when a test is selected. Each input line
is a step in the test. Fill out each line using Fieldpiece products, drop down
menus or manual entry. See Inputting Data on page 10-11 for more informa-
tion.
Step 3: View the Results on the OUTPUT FORM
e OUTPUT FORM displays the results of the calculations and refer-
ences this guide for each test. Recommended actions are displayed to x
problems or conrm system is running properly.
Step 4: Save, Download and Print Test
Tests can be saved onto the HVAC Guide. It then can be connected to
a computer to download the tests and print. All data and information from
INPUT FORM and OUTPUT FORM is printed.
The HG3 dial.
Superheat OUTPUT FORM.
Superheat INPUT FORM.
Step 2: Inputs can be entered using
Fieldpiece products, manual entry
or drop down menus.
Step 3: Outputs show you the results
of the test. Scroll down using the
arrows to see full results.
Step 4: Save the test, download it
to a PC and printout to hand back
to your customer.
Cle
Sav
e
SETUP
Target
Evaporator
Logger
Light
Exit Temp
CFM
Display
Superheat
SubcoolingCombustion
CheckMe!
Data
Service
b
t
tion
n
S
Su
n
t
ub
Step 1: Switch the dial to the test
you want to perform.
Printout Form.

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10 11
Inputting Data
Automatically with Fieldpiece Accessory Heads: Select a test on
the dial to view the INPUT FORM. Connect appropriate head by sliding
onto HG3 and switch the Accessory Head to parameter to be measured.
Select the Input to be measured on the HVAC Guide by scrolling and
highlighting the desired measurement using the UP/DOWN Arrows.
Press ENTER to start taking a measurement. Press ENTER again to lock
it in.
Wirelessly Using a Fieldpiece Transmitter: Fieldpiece Accessory
heads slide onto a wireless transmitter (ET2W or EHW4), Measure-
ments are taken by the Accessory head and sent wirelessly to the HG3.
e HG3 can receive up to 12 wireless signals at one time. See Wireless
Testing Section (Pages 12-13).
Drop Down Menus: Some input lines are choices (such as R-22 in the
Superheat test) and can be changed by selecting from a list. To get to the
list, highlight the input line you want to change with the UP/DOWN
arrows and press ENTER or the RIGHT arrow. Use the UP/DOWN ar-
rows to highlight the appropriate input and press ENTER to select it.
Manual Entry: Enter system data, Customer IDs or test data measured
with another instrument. Highlight the input line using the UP/DOWN
arrows and press the RIGHT arrow. en use the UP/DOWN arrows to
'type' in the rst digit or character. Press the Right arrow to get to the
next character. Press ENTER to lock it in.
Superheat INPUT FORM.
Refrigerant list Drop Down Menu.
Superheat INPUT FORM. Manual entry for SL
pressure input.
Use Sync button to wirelessly connect the HG3
to a Fieldpiece wireless enabled product.
Use the arrows to highlight an
input. Press right arrow to start
manual entry. Then use arrows
to "type" in each character.
Use the arrows to highlight an
option in a drop down menu. Press
enter to select desired option.
Connect Accessory Head. Scroll
to highlight desired input. Press
enter to start taking measurement.
Press enter to lock it in.
Input Output
Sync
Et
OutpOutputut
ncnc
Use the Sync button to connect to
Fieldpiece wireless products.

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12 13
Wireless Testing
Overview
Attach any Fieldpiece Accessory Head to the ET2W or EH4W to view or
log measurements on your HG3 in real-time. e HG3 has the capability to
wirelessly and simultaneously read up to 12 signals. A 13th accessory head
can be attached directly to the HG3 and gives you the ability to record 13
parameters at the same time.
Input Output
Sync
Enter
1
3 4
2
Attach Accessory Head to the ET2W
and power on both devices. It's
usually a good idea to disable
Auto-Off on the accessory head
when testing wirelessly.
Hold SYNC on the HG3 and then
SYNC on the ET2W.The SYNC LED
will be illuminated and a real time
measurement will appear.
For guided tests, Press OUTPUT
to lock in all measurements
simultaneously and view the
OUTPUT FORM. Or Press SYNC to
lock in a single measurement and
move to the next parameter.
For guided tests, select the INPUT
FORM line you want to enter.
All accessory heads can
be attached wirelessly
or directly to the HG3.
Send measurements from inconvenient locations for
faster testing. It's usually a good idea to disable Auto-
Off on the accessory head when testing wirelessly.
Clear
Input Output
Sync
Recall
Enter
Save
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEADS!
HVAC Guide
Fieldpiece HG3
SETUP
Target
Evaporator
Logger
Light
Exit Temp
CFM
Display
Superheat
SubcoolingCombustion
CheckMe!
Data
Service
INPUT FORM
SH Table:Standard
Refrigerant:R-22
OD Dry Bulb: 85.4ä)
5HWXUQ:% ä)
SL Pressure ä)
6/7HPS ä)
CustomerID:__JONES123
ASX14
Air
Conditioner
Superheat and
Subcooling
AUTO
OFF
T/C
CAL
SET
ATM
STABLE ON
LO BATT
Sync
ET2W
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEAD!
LO BATT
SEND
RECEIVE
ON
AC
DC
Wireless
Transmitter
ATH4
T1-T2
T2
T1
Function
T1
CAL T2 CALAUTO OFF
°C
°F
T1 T2
Set meter to mVDC
range to display
temperature directly.
LO BATT
ON
Dual
Temperature
Head
OFF
Input Output
Sync
Enter
ATH4
T1-T2
T2
T1
T1
CAL T2 CALAUTO OFF
OFF
ET2W
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEAD!
SEND ON
AC
DC

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14 15
Tests
Example Test
Below is an example step-by-step procedure for a Superheat test on a
xed restrictor system using the ATH4 and ASX14 accessory heads. As with
all tests on the HVAC Guide, accessory heads or manual entry can be used to
complete the test. Match the steps to their respective number in the diagram
to the right.
Step-by-Step Instructions for Superheat
1. Let system stabilize for 15 minutes prior to measuring superheat.
2. Select Superheat test.
3. Plug the ATA1 into T1 on the ATH4.
4. Plug the ATWB1 into T2 on the ATH4.
5. Slide the ATH4 onto the HVAC Guide and switch the ATH4 to T1.
6. Measure the OD Dry Bulb going into the condenser. Once the reading
has stabilized press Enter to lock it in.
7. Select T2 on the ATH4.
8. Measure the Wet Bulb close to the inlet of the Evaporator. Wet the
ATWB1 and insert it close to the inlet of the evaporator.
9. Press Enter to start taking the measurement. Once the reading has stabi-
lized press Enter to lock it in.
10. Detach the ATH4 and attach the ASX14 to the HVAC Guide. Attach one
side of your low side hose to the ASX14 and attach the other end to the
Suction Line (SL) service port.
11. Plug the ATC1 into the ASX14 and clamp it onto the SL between the
evaporator and compressor. Place at least 6" from compressor.
12. Switch ASX14 to Pressure. Press Enter on the HG3 to start taking the SL
Pressure. Press Enter to lock it in.
13. Switch ASX14 to Temp. Press Enter on the HG3 to start taking the SL
temperature. Press Enter to lock it in.
14. Press OUTPUT to view the results on the OUTPUT FORM. Compare
the Actual Superheat to the Target Superheat and read Suggested Actions
by scrolling down the OUTPUT FORM. See page 22 for more informa-
tion on the Superheat Test.
2
3
2
3
2
Clear
Input Output
Sync
Recall
Enter
Save
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEADS!
HVAC Guide
Fieldpiece HG3
SETUP
Target
Evaporator
Logger
Light
Exit Temp
CFM
Display
Superheat
SubcoolingCombustion
CheckMe!
Data
Service
INPUT FORM
Into Evap
Return DB: 72.1ä)
5HWXUQ:% ä)
Out of Evap
6XSSO\'% ä)
CustomerID:__JONES123
Units:English
ATH4
T1-T2
T2
T1
Function
T1
CAL T2 CALAUTO OFF
°C
°F
T1 T2
Set meter to mVDC
range to display
temperature directly.
LO BATT
ON
Dual
Temperature
Head
OFF
4
8
11
7
14
Clear
Input Output
Sync
Recall
Enter
Save
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEADS!
HVAC Guide
Fieldpiece HG3
SETUP
Target
Evaporator
Logger
Light
Exit Temp
CFM
Display
Superheat
SubcoolingCombustion
CheckMe!
Data
Service
INPUT FORM
SH Table:Standard
Refrigerant:R-22
OD Dry Bulb: 85.4ä)
5HWXUQ:% ä)
SL Pressure ä)
6/7HPS ä)
CustomerID:__JONES123
ASX14
Air
Conditioner
Superheat and
Subcooling
AUTO
OFF
T/C
CAL
SET
ATM
STABLE ON
LO BATT
5
9
6
10
12
13
Clear
Input Output
Sync
Recall
Enter
Save
MAX30VDC
24VAC
CONNECTONLYTO
ACCESSORYHEADS!
HVAC Guide
Fieldpiece
HG3
SETUP
Target
Evaporator
Logger
Light
ExitTemp
CFM
Display
Superheat
Subcooling
Combustion
CheckMe!
Data
Service
put Output
Sync
Enter
ve
MAX30VDC
24VAC
CONNECTONLYTO
ACCESSORYHEADS!
SETUP
Display
Superheat
oling
CheckMe!
INPUT FORM
Grille 01
ID:LivingRm1
Flow:Supply
Manufacturer’s Data
Free Area in sqft:
00.421sqft
Velocity: 212ft/min
INPUT FORM
Into Evap
Return DB: 72.1ä)
5HWXUQ:% ä)
Out of Evap
6XSSO\'% ä)
CustomerID:__JONES123
Units:English
on
°C
°F
T2
LOBATT
ON
e
ATH4
T1-T2
T2
T1
Function
T1
CAL T2
CAL
AUTOOFF
°C
°F
T1 T2
Setmeter to mVDC
rangeto display
temperaturedirectly.
LOBATT
ON
Dual
Temperature
Head
OFF
AAV3
Air Velocity
& Temperature
Accessory
Head
ON LCD
X100
LOBATT READ
ENGLISH
ENGLISH METRIC
Ft/min
MPH
°F
M/s
KM/hr
°C
METRIC
AVG
NORMAL
AUTOOFF

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16 17
1.1Target Evaporator Exit Temp Overview
Target Evaporator Exit Temp (aka temperature drop or delta T) is used to
determine if the evaporator is getting the optimum airow.
e HVAC Guide calculates the Target Evaporator Exit Temperature so
the technician can compare it to the Actual Evaporator Exit Temperature. If
the charge is correct and Actual Evaporator Exit Temperature is more than
3°F above or below the Target Evaporator Exit Temperature, an airow prob-
lem may exist. e Target Evaporator Exit Temperature switch position is
Title 24 compliant.
An Actual Evap Exit DB Temp below the Target Evap Exit DB Temp is an
indication of low airow.
Increasing airow can be accomplished by eliminating restrictions in the
duct system, increasing blower speed, cleaning lters or opening registers.
Aer corrective measures are taken, repeat measurement procedures as oen
as necessary to establish adequate airow range. Allow system to stabilize for
15 minutes before repeating measurement procedure.1
An Actual Evap Exit DB Temp above the Target Evap Exit DB Temp
usually indicates low capacity. Occasionally airow is higher than expected.
Look for causes of low capacity such as refrigerant mischarge or dirty con-
denser coil. If the airow is high, correct by lowering the fan speed.
1 2005 Residential ACM Manual, Page RD-5, (#5-7)
Direction
of Airow
A-Coil
A-Coil
Filter
Filter
Fan
Fan
Dry Bulb and
Dry Bulb and
Wet Bulb T/C
Wet Bulb T/C
Dry Bulb T/C
Supply Plenum
Supply Plenum
b
T
Dr
y
Bu
lb
T
Clear
Input Output
Sync
Recall
Enter
Save
MAX 30VDC
24VAC
CONNECT ONLYTO
ACCESSORY HEADS!
HVAC Guide
Fieldpiece HG3
SETUP
Target
Evaporator
Logger
Light
Exit Temp
CFM
Display
Superheat
SubcoolingCombustion
CheckMe!
Data
Service
INPUT FORM
Into Evap
Return DB: 72.1ä)
5HWXUQ:% ä)
Out of Evap
Supply DB ä)
CustomerID:__JONES123
Units:English
ATH4
T1-T2
T2
T1
Function
T1
CAL T2 CALAUTO OFF
°C
°F
T1 T2
Set meter to mVDC
range to display
temperature directly.
LO BATT
ON
Dual
Temperature
Head
OFF
Setting up the ATH4 and HVAC Guide
analyze to measure return dry bulb and
wet bulb temperatures between the air
filter and evaporator coil.

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18 19
1.2 Target Evap Exit Temp INPUT FORM
Inputs
Into Evap Return DB (Into Evaporator Return Dry Bulb) Air tempera-
ture going into the evaporator. Take measurements as close to the air
handler as possible. If the lter is directly before the air handler clip the
included dry bulb thermocouple (ATA1) onto the lter. If the lter is
not just before the air handler drill small holes in the return plenum and
take measurements. Seal any holes before leaving the job site. Suggested
Accessories: ATH4, ATA1.
Into Evap Return WB (Into Evaporator Return Wet Bulb) Use the wet
bulb thermocouple (ATWB1) and take measurement at the same place
as the Into Evap Return DB. Suggested Accessories: ATH4, ATWB1.
Out of Evap Supply Dry Bulb Air temperature coming out of the
evaporator. Punch or drill a small hole in the supply plenum and mea-
sure in the center of the plenum. Suggested Accessories: ATH4, ATB1.
Ret Plen Pres (Return Plenum Pressure) Optional. Static pressure in the
return plenum before the evaporator. Suggested Accessories: ADMN2,
ASP2.
Sup Plen Pres (Supply Plenum Pressure) Optional. Static pressure in the
supply plenum aer the evaporator. Suggested Accessories: ADMN2,
ASP2.
Customer ID Used in the le name to save, recall and download tests. Use
arrow buttons to "type" in each character.
Units Select English or Metric units.
Press enter to see a list of
saved Customer IDs or use
arrows to enter a new ID.
Target Evaporator ExitTemperatureTest INPUT FORM filled.
Target Evaporator ExitTemperatureTest INPUT FORM
continued from above.
Connect Accessory Head.
Scroll to highlight desired
parameter. Press enter to
start taking measurement.
Press enter again to lock
it in.
Take measurements using
Fieldpiece Accessory Heads
to automatically input
onto the INPUT FORM.
Measurements can also be
taken wirelessly. See page
12 for wireless instructions.
You can also enter
measurements manually
with the arrow buttons.
The negative sign is found
between 9 and 0.

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20 21
1.3 Target Evap Exit Temp OUTPUT FORM
Outputs
Target Evap Exit DB Temp e target air temperature exiting the
evaporator based on the measured Return Air Wet Bulb and Dry Bulb.
If charge and airow are adjusted properly, the Actual Evap Exit Temp
should be close to the Target Evap Exit DB Temp.
Actual Evap Exit Temp e measured air temperature leaving the evap-
orator. is is the same as Out of Evap Supply Dry Bulb (See page 18).
Fan Press (Fan Pressure) e pressure dierence between the supply ple-
num pressure and the return plenum pressure.
Suggested Actions Suggested actions are displayed to correct the prob-
lem. Use the down arrow to scroll down the OUTPUT FORM.
See Sec (See Section) e section numbers at the end of the OUTPUT
FORM refer to the sections in this manual with more detailed informa-
tion about each test.
Target Evap ExitTemp OUTPUT FORM.
Target Evap ExitTemp OUTPUT FORM continued from above.
Compare the Target to the
Actual Evap ExitTemp.
The OUTPUT FORM displays
the results of the test.
Use suggested actions to
fix the problem. Scroll
down to see more.
Continued from above. Use
the Up/Down Arrows to
scroll through the OUTPUT
FORM to see all suggested
actions.

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22 23
2.1 Superheat Overview
Superheat is the temperature rise above the boiling point of the refriger-
ant. Too high, and the refrigerant boils o early in the evaporator and wastes
most of the capacity of the evaporator. Too low, and you risk liquid going into
the compressor.
Using superheat is the best way to obtain proper refrigerant charge for a
xed restrictor metering device system.
If the air conditioner is in good working order and the airow is adjusted
properly, comparing the actual and target superheat will tell you if refriger-
ant needs to be added or recovered. Ensure the pressure never exceeds the
manufacturer's maximum overload pressure guidelines.
On a xed restrictor system, the target superheat is determined based
upon the indoor wet bulb and outdoor dry bulb temperatures.
e Actual SH (superheat) should be within ±5°F of the Target SH to
ensure optimum performance. If the actual SH is outside this range, modi-
cations to the charge or adjustments to the restrictor (TXV) are necessary.
Adding refrigerant lowers Actual SH. Recovering refrigerant increases
your Actual SH. e amount of refrigerant necessary to add or recover will
vary based on the size of the system and the dierence between the Actual
and Target SH.
To get Actual Superheat, you need to measure suction line pressure and
suction line temperature. To get Target Superheat heat for xed restrictor
systems you need to measure return air wet bulb and outdoor dry bulb.
Because everything within the system is interdependent, one adjustment
can aect other parts of the system. For example, increasing airow increases
the superheat, which may require adding refrigerant. Aer modications, al-
low 15 minutes to stabilize and then retest.
Refrigeration Cycle
Use the HG3, ASX14 and ATC1
to get actual superheat.
EVAPORATOR
CONDENSER
THROTTLE
VALVE
COMPRESSOR
REFRIGERANT
FLOW
H
i
g
h
P
r
e
s
s
u
r
e
S
i
d
e
L
o
w
P
r
e
s
s
u
r
e
S
i
d
e
RETURN AIR SUPPLY AIR
OUTDOOR AIR HOT AIR
R
AUTO
OFF
T/C
CAL
T
TT
Clear
Input Output
Sync
Recall
Enter
Save
MAX 30VDC
24VAC
CONNECT ONLYTO
ACCESSORYHEADS!
HVAC Guide
Fieldpiece HG3
SETUP
Targ et
Evaporator
Logger
Light
Exit Temp
CFM
Display
Superheat
SubcoolingCombustion
CheckMe!
Data
Service
INPUT FORM
SH Table:Standard
Refrigerant:R-22
OD Dry Bulb: 85.4ä)
5HWXUQ:% ä)
SL Pressure ä)
6/7HPS ä)
CustomerID:__JONES123
ASX14
Air
Conditioner
Superheat and
Subcooling
AUTO
OFF
T/C
CAL
SET
ATM
STABLE ON
LO BATT

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24 25
2.2 Superheat INPUT FORM
Inputs
SH Table (Superheat Table) Select Standard or Custom. Standard calcu-
lates the Target Superheat using charts from California's Title 24. Cus-
tom allows the technician to enter in the Target Superheat.
Target SH (Target Superheat) if you selected Custom on SH Table and then
type in the Manufacturer's recommended superheat in the Target SH
input.
Refrigerant Select from the 39 Refrigerants available.
OD Dry Bulb (Outdoor Dry Bulb) Air temperature going into the con-
denser. Suggested Accessories: ATH4, ATA1.
Ret Wet Bulb (Return Wet Bulb) Take the wet bulb temperature at the in-
let of the evaporator. Generally right before the lter is a good location.
Suggested Accessories: ATH4, ATWB1.
SL Pressure (Suction Line Pressure) Pressure of the suction line taken at
the suction line service port. Suggested Accessories: ASX14.
SL Temp (Suction Line Temperature) Take the suction line temperature be-
tween the evaporator and compressor. Make sure to be at least 6 inches
away from the compressor. Suggested Accessories: ATC1.
Customer ID Used in the le name to save, recall and download tests. Use
arrow buttons to "type" in each character. Press RIGHT arrow to get to
the rst character. Once complete, press ENTER to lock it in.
Units Select English or Metric units
Superheat INPUT FORM using the Standard superheat table
fromTitle 24.
Superheat INPUT FORM using the Custom superheat table
which allows the technician to enter in the manufacturer's
recommended superheat.
Use the arrows to type in
each character.
Press right arrow then
UP/DOWN arrows to switch
to Custom to enter
the manufacturer's
recommended superheat.
Use arrows to manually
enter in manufacturer's
recommended superheat.
Units can be changed to
either English or Metric.
Highlight input and press
Enter to see the list of
refrigerants. Scroll to desired
refrigerant. Press Enter to
lock it in.
Take measurements using
Fieldpiece Accessory Heads
or manual entry.

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26 27
2.3 Superheat OUTPUT FORM
Outputs
Target SH (Superheat): Indicates what the superheat should be. For Cus-
tom SH Table it is the manufacturer's recommended superheat entered
by the tech. For Standard SH Table it is calculated from Return Wet Bulb
and Outdoor Dry Bulb.
Actual SH (Superheat): Shows the superheat calculated from the measured
suction line temperature and suction line pressure.
Vapor Sat: is is the vapor saturation temperature (boiling point) of the
refrigerant in the evaporator coil. Calculated from SL Pressure.
Suggested Actions: Suggested actions are displayed to correct the
problem. Use the down arrow to scroll down OUTPUT FORM. Be-
cause everything within the system is interdependent, one adjust-
ment can affect the whole system. Tests should be used together
such as Superheat to correct refrigerant charge and Target Evap Exit
Temp to correct airflow across the evaporator coil.
See Sec (See Section): e section numbers on the OUTPUT FORM refer
to the sections in this manual with more detailed information about each
test.
Keep scrolling through the
OUTPUT FORM to see all
suggested actions.
Superheat OUTPUT FORM.
Superheat OUTPUT FORM continued from above.
The OUTPUT FORM displays
the results of the test.
Compare the Target SH to
the Actual SH. The difference
should be about 5 °F.
Use suggested actions to fix
the problem. Scroll down to
see more.

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28 29
3.1 Subcooling Overview
Subcooling is the temperature decrease below the saturation tempera-
ture (same as the condensing point) in the condenser. Too high, and refriger-
ant condenses too early in the condenser and ‘wastes’ most of the capacity of
the condenser. Too low, and a mixture of gas and liquid can be delivered to
the expansion valve, reducing eciency.
In a properly working TXV/EXV system, the superheat is held constant.
is is why subcooling is the best way to obtain proper refrigerant charge for
a TXV/EXV system. If the air conditioner is in good working order and the
airow is adjusted properly, comparing the actual and target subcooling will
tell you if refrigerant needs to be added or recovered (ensure the pressure
never exceeds the manufacturer's maximum overload pressure guidelines).
Make sure the TXV/EXV bulb is installed properly, there is proper re-
frigerant to obtain target subcooling, and there are no liquid line restrictions.
e
Actual SC (subcooling) should be within ±3°F of the Target SC
for correct refrigerant charge.
For Actual Subcooling, you need to measure liquid line pressure and liq-
uid line temperature. Target Subcooling is usually specied by the manufac-
turer and if not the HG3 uses conservative Target Subcooling tables.
Adding refrigerant increases your Actual SC. Recovering refrigerant
decreases your Actual SC. e amount of refrigerant necessary to add or
recover will vary based on the size of the system and the dierence between
the Actual and Target SC.
Because everything is interdependent, changes in one part of the system
aect other parts of the system. For example, increasing airow decreases the
subcooling, which may require adding refrigerant. Aer modications, allow
15 minutes for the system to stabilize; and then retest.
Use the HG3, ASX14, and ATC1
to measure Actual Subcooling.
Refrigeration Cycle
EVAPORATOR
CONDENSER
THROTTLE
VALVE
COMPRESSOR
REFRIGERANT
FLOW
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RETURN AIR SUPPLY AIR
OUTDOOR AIR HOT AIR
AUTO
OFF
T/C
CAL
SET
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Recall
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Save
MAX 30VDC
24VAC
CONNECT ONLYTO
ACCESSORYHEADS!
HVAC Guide
Fieldpiec e HG3
SETUP
Target
Evaporator
Logger
Light
Exit Temp
CFM
Display
Superheat
SubcoolingCombustion
CheckMe!
Data
Service
INPUT FORM
SH Table:Standard
Refrigerant:R-22
OD Dry Bulb: 85.4ä)
5HWXUQ:% ä)
SL Pressure ä)
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CustomerID:__JONES123
ASX14
Air
Conditioner
Superheat and
Subcooling
AUTO
OFF
T/C
CAL
SET
ATM
STABLE ON
LO BATT

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30 31
3.2 Subcooling INPUT FORM
Inputs
Target Subcooling Find this value on the equipment manufacturer's
name plate. If it's not listed, the HVAC Guide will make a conservative
estimate.
Refrigerant 39 Refrigerants available. Press Enter to get to the list. Use
the UP/DOWN arrows to select refrigerant. Press ENTER to lock it in.
LL Pressure Liquid Line Pressure taken at the liquid line service port.
LL Temp Taken aer the condenser near the liquid line service port.
Customer ID Used in the le name to save, recall and download tests. Use
arrow buttons to key in each character. Press RIGHT arrow to get to the
rst character. Once complete press ENTER to lock it in.
Units Select English or Metric units.
Subcooling INPUT FORM asks the technician if the
manufacturer's recommended subcooling is available
before proceeding with the test.
Subcooling INPUT FORM with manufacturer's data.
Select Yes or No and press
Enter. If you select No the
HVAC Guide will base the
Target SC on a conservative
chart.
Use Arrows to enter Target SC.
Take measurements using
Fieldpiece Accessory Heads
enter them manually.

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32 33
3.3 Subcooling OUTPUT FORM
Outputs
Target SC (Subcooling) Indicates what the subcooling should be from the
manufacturer’s specications. e HVAC Guide uses a built in conserva-
tive estimate when manufacturer’s specications are not available.
Actual SC (Subcooling) Displays the subcooling calculated from the mea-
sured liquid line temperature and liquid line pressure.
Liquid Sat is is the saturation temperature of the refrigerant in the con-
denser coil. It is one of the temperatures from which subcooling is cal-
culated.
See Sec (See Section) e section numbers on the OUTPUT FORM refer to
the sections in this manual with more detailed information about each
test.
Suggested Actions Suggested actions are displayed to correct the
problem. Use the down arrow to scroll down the OUTPUT FORM.
Because everything within the system is interdependent, one adjust-
ment can affect the whole system. Tests should be used together
such as Subcooling to correct refrigerant charge and Target Evap
Exit Temp to correct airflow across the evaporator coil.
Subcooling OUTPUT FORM.
Subcooling OUTPUT FORM continued from above.
Compare the Actual SC to the
Target SC. Actual subcooling
should be within about 3°F
the target subcooling.
The OUTPUT FORM displays
the results of the test.
Keep scrolling through the
OUTPUT FORM to see all
suggested actions.
Use suggested actions to fix
the problem. Scroll down
with the arrows to see more.

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34 35
4.1 Combustion Overview
Combustion Test helps you determine the eectiveness of the combus-
tion by analysis of combustion products and temperature.
e Combustion Test will only tell you about combustion and does not
take into account any losses from poor insulation, or cycling and standby
losses. It does not measure any losses in the distribution system such as unin-
sulated hydronic piping, air duct leakage or insulation levels.
Properly tuned gas combustion equipment will produce little or no car-
bon monoxide, no soot, and will consume less fuel.
Combustion gases should be sampled close to the exit from the heat ex-
changer within an area where all gases would be well mixed and before dilu-
tion air enters the venting systems (i.e. dra hoods, barometric dampers, etc).
Testing within 18 inches of the breech is a typical location for most oil-red
equipment. If the appliance is an atmospheric gas type with a dra hood, the
test would be taken in the top ue passage prior to mixing with dilution air.
Aer testing is complete, the hole in the ue/stack must be plugged ap-
propriately.
Use the HG3, AOX2, ACM3, and AOXP2
to perform combustion analysis.

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36 37
4.2 Combustion INPUT FORM
Inputs
Fuel Select Natural Gas, Oil #2 or Propane.
Type Default: Condensing. Other selection: Non-Condensing. e pres-
ence of a condensate line indicates a condensing unit, otherwise it is a
non-condensing unit.
Primary Temp (Primary Temperature) Measure the temperature of the
air being introduced to the combustion process.
O2 (Oxygen) Connect the AOX2 with the switch on %O2and take a sample
of the combustion products in the ue/stack (within 18 inches from the
start of the ue).
Flue Temp (Flue Temperature) Connect the ATR1 temperature probe to
the AOX2. Set the AOX2 on TEMP and measure the temperature of the
combustion products in the ue/stack (18 inches from the start of the
ue).
CO (Carbon Monoxide) Connect the ACM3 and take a sample of the com-
bustion products in the ue/stack in the same location as the O2% mea-
surement (within 18 inches from the start of the ue).
Dra Press (Dra Pressure) Air pressure taken in the ue. Suggested Ac-
cessories: ADMN2, ASP2.
Customer ID Used in the le name to save, recall and download tests. Use
arrow buttons to "type" in each character. Press RIGHT arrow to get to
the rst character. Once complete press ENTER to lock it in.
Units Select English or Metric units.
Combustion Analysis INPUT FORM.
Fuel drop down menu.
Press Enter to see the fuel list.
Take measurements using
Fieldpiece Accessory Heads
or manual entry.
Scroll to appropriate Fuel
using the UP/DOWN Arrows.
Press Enter to lock it in.

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38 39
4.3 Combustion OUTPUT FORM
Outputs
CO2 (carbon dioxide) e %CO2in the combustion products.
Excess O2 (Excess Air) e amount of O2above the minimum theoreti-
cal amount needed for complete combustion. For complete and ecient
combustion, Excess O2must be adjusted to manufacturer’s specica-
tions.
COAF (Carbon Monoxide Air Free) e amount of CO in the combustion
products taking into account the dilution eect of excess O2.
Net Temp (Net Temperature) e stack (vent) temperature minus the pri-
mary air temperature.
Standard E (Eciency) e actual eciency of the combustion equip-
ment calculated by analyzing the losses up the exhaust.
Siegert E (Eciency) e European standard for combustion eciency.
See Sec (See Section) e section numbers on the OUTPUT FORM refer to
the sections in this manual with more detailed information about each
test.
Atmospheric Fan Assisted Natural Gas or LPG
Oxygen (O2) 6-9%
StackTemperature 325-500°F
Condensing Natural Gas or LG
Oxygen (O2) 6-9%
StackTemperature 90-140°F
Natural Gas/LPG Power Burners
Oxygen (O2) 3-6%
StackTemperature 275-500°F
Fuel oil Flame Retention Power Burners
Oxygen (O2) 3-7%
StackTemperature 325-500°F
Fuel Oil Non-Flame Retention Power Burners
Oxygen (O2) 6-9%
StackTemperature 400-600°F
Condensing Oil
Oxygen (O2) 3-7%
StackTemperature 90-140°F
Combustion OUTPUT FORM.
Appropriate levels for combustion equipment chart.
Manufacturer's specifications should always be
determined before adjusting the system.
The OUTPUT FORM displays the
results of the test. Standard
Efficiency should be close to
manufacturer's specifications.