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1 6
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1.1
Target 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 airflow.
The 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 airflow prob-
lem may exist. The 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 airflow.
Increasing airflow can be accomplished by eliminating restrictions in the
duct system, increasing blower speed, cleaning filters or opening registers.
After corrective measures are taken, repeat measurement procedures as often
as necessary to establish adequate airflow 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 airflow is higher than expected.
Look for causes of low capacity such as refrigerant mischarge or dirty con-
denser coil. If the airflow is high, correct by lowering the fan speed.
1 2005 Residential ACM Manual, Page RD-5, (#5-7)
Direction
of Airflow
A-Coil
Filter
Fan
Dry Bulb and
Wet Bulb T/C
Dry Bulb T/C
Supply Plenum
Clear
Input
Output
Sync
Recall
Enter
Save
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEADS!
HVAC Guide
Fieldpiece HG3
SETUP
Target
Evaporator
Logger
Exit Temp
CFM
Display
Superheat
Subcooling
Combustion
CheckMe!
Data
Jacket
Charging
Clear
Input
Output
Sync
Recall
Enter
Save
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEADS!
HVAC Guide
Fieldpiece HG3
SETUP
Target
Evaporator
Logger
Exit Temp
CFM
Display
Superheat
Subcooling
Combustion
CheckMe!
Data
Clear
Input
Output
Sync
Recall
Enter
Save
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEADS!
HVAC Guide
Fieldpiece HG3
SETUP
Target
Evaporator
Logger
Exit Temp
CFM
Display
Superheat
Subcooling
Combustion
CheckMe!
Data
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
Subcooling
Combustion
CheckMe!
Data
Service
Clear
Input
Output
Sync
Recall
Enter
Save
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEADS!
HVAC Guide
Fieldpiece HG3
SETUP
Target
Evaporator
Logger
Exit Temp
CFM
Display
Superheat
Subcooling
Combustion
CheckMe!
Data
Clear
Input
Output
Sync
Recall
Enter
Save
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEADS!
HVAC Guide
Fieldpiece HG3
SETUP
Target
Evaporator
Logger
Exit Temp
CFM
Display
Superheat
Subcooling
Combustion
CheckMe!
Data
Clear
Input
Output
Sync
Recall
Enter
Save
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEADS!
HVAC Guide
Fieldpiece HG3
SETUP
Target
Evaporator
Logger
Exit Temp
CFM
Display
Superheat
Subcooling
Combustion
CheckMe!
Data
Clear
Input
Output
Sync
Recall
Enter
Save
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEADS!
HVAC Guide
Fieldpiece HG3
SETUP
Target
Evaporator
Logger
Exit Temp
CFM
Display
Superheat
Subcooling
Combustion
CheckMe!
Data
Clear
Input
Output
Sync
Recall
Enter
Save
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEADS!
HVAC Guide
Fieldpiece HG3
SETUP
Target
Evaporator
Logger
Exit Temp
CFM
Display
Superheat
Subcooling
Combustion
CheckMe!
Data
Clear
Input
Output
Sync
Recall
Enter
Save
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEADS!
HVAC Guide
Fieldpiece HG3
SETUP
Target
Evaporator
Logger
Exit Temp
CFM
Display
Superheat
Subcooling
Combustion
CheckMe!
Data
Clear
Input
Output
Sync
Recall
Enter
Save
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEADS!
HVAC Guide
Fieldpiece HG3
SETUP
Target
Evaporator
Logger
Exit Temp
CFM
Display
Superheat
Subcooling
Combustion
CheckMe!
Data
Clear
Input
Output
Sync
Recall
Enter
Save
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEADS!
HVAC Guide
Fieldpiece HG3
SETUP
Target
Evaporator
Logger
Exit Temp
CFM
Display
Superheat
Subcooling
Combustion
CheckMe!
Data
Clear
Input
Output
Sync
Recall
Enter
Save
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEADS!
HVAC Guide
Fieldpiece HG3
SETUP
Target
Evaporator
Logger
Exit Temp
CFM
Display
Superheat
Subcooling
Combustion
CheckMe!
Data
Clear
Input
Output
Sync
Recall
Enter
Save
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEADS!
HVAC Guide
Fieldpiece HG3
SETUP
Target
Evaporator
Logger
Exit Temp
CFM
Display
Superheat
Subcooling
Combustion
CheckMe!
Data
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
Subcooling
Combustion
CheckMe!
Data
Service
Clear
Input
Output
Sync
Recall
Enter
Save
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEADS!
HVAC Guide
Fieldpiece HG3
SETUP
Target
Evaporator
Logger
Exit Temp
CFM
Display
Superheat
Subcooling
Combustion
CheckMe!
Data
Clear
Input
Output
Sync
Recall
Enter
Save
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEADS!
HVAC Guide
Fieldpiece HG3
SETUP
Target
Evaporator
Logger
Exit Temp
CFM
Display
Superheat
Subcooling
Combustion
CheckMe!
Data
Clear
Input
Output
Sync
Recall
Enter
Save
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEADS!
HVAC Guide
Fieldpiece HG3
SETUP
Target
Evaporator
Logger
Exit Temp
CFM
Display
Superheat
Subcooling
Combustion
CheckMe!
Data
Clear
Input
Output
Sync
Recall
Enter
Save
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEADS!
HVAC Guide
Fieldpiece HG3
SETUP
Target
Evaporator
Logger
Exit Temp
CFM
Display
Superheat
Subcooling
Combustion
CheckMe!
Data
Clear
Input
Output
Sync
Recall
Enter
Save
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEADS!
HVAC Guide
Fieldpiece HG3
SETUP
Target
Evaporator
Logger
Exit Temp
CFM
Display
Superheat
Subcooling
Combustion
CheckMe!
Data
Clear
Input
Output
Sync
Recall
Enter
Save
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEADS!
HVAC Guide
Fieldpiece HG3
SETUP
Target
Evaporator
Logger
Exit Temp
CFM
Display
Superheat
Subcooling
Combustion
CheckMe!
Data
Clear
Input
Output
Sync
Recall
Enter
Save
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEADS!
HVAC Guide
Fieldpiece HG3
SETUP
Target
Evaporator
Logger
Exit Temp
CFM
Display
Superheat
Subcooling
Combustion
CheckMe!
Data
Clear
Input
Output
Sync
Recall
Enter
Save
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEADS!
HVAC Guide
Fieldpiece HG3
SETUP
Target
Evaporator
Logger
Exit Temp
CFM
Display
Superheat
Subcooling
Combustion
CheckMe!
Data
Clear
Input
Output
Sync
Recall
Enter
Save
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEADS!
HVAC Guide
Fieldpiece HG3
SETUP
Target
Evaporator
Logger
Exit Temp
CFM
Display
Superheat
Subcooling
Combustion
CheckMe!
Data
Jacket
Charging
Jacket
Charging
Jacket
Charging
Jacket
Charging
Jacket
Charging
Jacket
Charging
Jacket
Charging
Jacket
Charging
Jacket
Charging
Jacket
Charging
Jacket
Charging
Jacket
Charging
Jacket
Charging
Jacket
Charging
Jacket
Charging
Jacket
Charging
Jacket
Charging
Jacket
Charging
Jacket
Charging
Jacket
Charging
Jacket
Charging
OUTPUT FORM
CO2: 6.3%
Excess O2:
76.8%
COAF: 103ppm
Net Temp:
82 ˙F
Standard Eff:
85%
Siegert Eff:
94%
Draft Press: 0.08IWC
INPUT FORM
Pressure is between
160psig and 220psig.
SL Pressure: ---.-psig
LL Pressure: ---.-psig
Difference: ---.-psig
Confirm Pressures
CustomerID: __JONES123
INPUT FORM
SH Table:Standard
Refrigerant:R-22
OD Dry Bulb:
85.4
˙F
Return WB:
61.0˙F
SL Pressure
:
---.-˙F
SL Temp:
--.-˙F
CustomerID:__JONES123
INPUT FORM
Into Evap
Return DB
: 72.1
˙F
Return WB:
64.5˙F
Out of Evap
Supply DB:
55.6˙F
CustomerID: __JONES123
Units:English
INPUT FORM
Span: 2hours
Per: 30seconds
SEY
SET ID:IndoorTemp
Measurement: 72.8
SET ID:CompAmps
Measurement: 17.2
INPUT FORM
ACV
CustomerID
:--JONES123
01/24/2000 04:20:22PM
OUTPUT FORM
CO2: 6.3%
Excess O2:
76.8%
COAF: 103ppm
Net Temp:
82 ˙F
Standard Eff:
85%
Siegert Eff:
94%
Draft Press: 0.08IWC
INPUT FORM W/O
Manufacturer’s Data
Refrigerant: R-22
LL Pressure: 220.3psig
LL Temp
:
91.1˙F
CustomerID:__JONES123
Units:English
12/31/2011 11:59:59PM
INPUT FORM W/O
Manufacturer’s Data
Refrigerant: R-22
LL Pressure: 220.3psig
LL Temp
:
91.1˙F
CustomerID:__JONES123
Units:English
12/31/2011 11:59:59PM
INPUT FORM
Into Evap
Return DB:
72.1
˙F
Return WB:
64.5˙F
Out of Evap
Supply DB
:
55.6˙F
CustomerID: __JONES123
Units:English
INPUT FORM
Refrigerant:R-410A
Constrict the
Charging Jacket until
the difference
between the SL
Pressure and LL
Pressure is between
INPUT FORM
SH Table:Standard
Refrigerant:R-22
OD Dry Bulb:
85.4
˙F
Return WB:
61.0˙F
SL Pressure
:
---.-˙F
SL Temp:
--.-˙F
CustomerID:__JONES123
INPUT FORM
Sys Type
:AC
Grant and Sys Info:
None
INDOOR UNIT
Meter Device:TXV/TEV
Return DB:
71.7˙F
Return WB:
60.8˙F
INPUT FORM
Sys Type
:AC
Grant and Sys Info:
None
INDOOR UNIT
Meter Device:TXV/TEV
Return DB:
71.7˙F
Return WB:
60.8˙F
Memory:
Com with PC
Erase a Single Test
Erase a Customer
Erase a Grant
Check Memory Status
Clear Data logs
Clear All Data
Memory:
Com with PC
Erase a Single Test
Erase a Customer
Erase a Grant
Check Memory Status
Clear Data logs
Clear All Data
INPUT FORM
SET ID:IndoorTemp
Measurement: 72.8
SET ID:CompAmps
Measurement: 17.2
Span: 2hours
Per: 30seconds
START
INPUT FORM
DCV
CustomerID
:--JONES123
01/24/2000 04:20:22PM
INPUT FORM
Grille 01
ID:LivingRm1
Flow:Supply
Manufacturer’s Data
Free Area in sqft:
00.421sqft
Velocity
: 212ft/min
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:
72.1
˙F
Return WB:
64.5˙F
Out of Evap
Supply DB:
55.6˙F
CustomerID
: __JONES123
Units:English
ARH4
Sling
Psychrometer
Head
ON
AUTO OFF
1%RH/mVDC
1°F/mVDC
1°C/mVDC
LO BATT
DEW POINT
%RH
WET BULB
TEMP
°F
°C
ON
OFF
ATH4
T1-T2
T2
T1
Function
T1
CAL
T2
CAL
AUTO OFF
°C
°F
T1
T2
Set meter to mVDC
range to display
temperature directly.
LO BATT
ON
Dual
Temperature
Head
OFF
ATH4
T1-T2
T2
T1
Function
T1
CAL
T2
CAL
AUTO OFF
°C
°F
T1
T2
Set meter to mVDC
range to display
temperature directly.
LO BATT
ON
Dual
Temperature
Head
OFF
AAV3
Air Velocity
& Temperature
Accessory
Head
ON
LCD
X100
LO BATT
READ
ENGLISH
ENGLISH METRIC
Ft/min
MPH
°F
M/s
KM/hr
°C
METRIC
AVG
NORMAL
AUTO OFF
AOX2
Combustion
Check
%
O
%
CO
TEMP
ON
GAS
OIL
Lo Batt
°C °F
AUTO
OFF
STABLE
Fuel Type
2
2
T/C
CAL
ACM3
Carbon
Monoxide
Accessory
Head
ON
Converts
1PPM CO
concentration
to 1mVDC
LO BATT
ON
OFF
AVERAGE
NORMAL
AUTO
OFF
ZERO
SET
ACH4
CAT.III
300V
400A
CLAMP
AC Current
Clamp
1AAC / 1mVAC
400AAC MAX
!
ASX14
Air
Conditioner
Superheat and
Subcooling
AUTO
OFF
T/C
CAL
SET
ATM
STABLE
ON
LO BATT
Setting up the ATH4 and HVAC Guide
analyze to measure return dry bulb and
wet bulb temperatures between the air
filter and evaporator coil.
