Tests 1.1, Target evaporator exit temperature, Figure 3. setting up the ath4 and hvac guide – Fieldpiece HG2 - HVAC Guide System Analyzer User Manual
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Tests
1.1
Target Evaporator Exit Temperature
For given return plenum air conditions, Target
Evaporator Exit Temperature gives you an indication of
the proper indoor airfl ow. Th
is test can be easily per-
formed simultaneously with superheat or subcooling
tests.
If actual evaporator exit temperature is more than
3°F above or below the Target Evaporator Exit Tempera-
ture, an airfl ow problem may exist. Ensure that fi lters are
clear, dampers are adjusted properly and the fan speed
is set correctly if it can be varied. Th
e Target Evapora-
tor Exit Temperature switch position uses the table from
California Title 24.
Direction
of Airfl ow
A-Coil
A-Coil
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
C
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ter
Figure 3. Setting up the ATH4 and
HVAC Guide
TM
tester to measure dry
bulb and wet bulb temperatures
between fi lter and coil.