Fieldpiece HG2 - HVAC Guide System Analyzer - Manual (Page 13)

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3.2 Subcooling INPUT FORM
Figure 12. Subcooling Test INPUT FORM question.
Figure 13. Subcooling Test INPUT FORM with Manufacturer's Data.
Figure 14. Subcooling Test INPUT FORM without Manufacturer's Data.
Does the manufacturer have a recommended
subcooling? Default: Yes. Always answer "YES" if
you have a manufacturer’s recommended subcooling.
Other selection: "NO" will use a conservative estimate
for Target SC (Subcooling).
Refrigerant: Default: R-22. Other selections: R410A,
R-134A, R-404A, R-407C, R-409A, R-408A, R-507A,
R-414B (Hotshot
TM ), R-422C (Oneshot TM ), R-422B
(NU222B TM ) or R-12.
Target SC (WITH Manufacturer’s Data) : Man-
ually input the manufacturer’s target subcooling.
LL Pressure (liquid line pressure): Connect the
ASX14 to the liquid line service port. Set the acces-
sory head to measure pressure and ensure the read-
ing stabilizes before locking in the reading. Enter
data manually if you want to get pressure from your
gauges. Th
e analysis is only as good as the measure-
ments. Th e Fieldpiece ASX14 has better resolution
than most gauge sets.
LL Temp (liquid line temperature): Measure near the
same location LL Pressure was taken. Use the ATC1,
ATC2 or ATC3 to get a good pipe temperature. Th
e
clamp should be perpendicular to the pipe and
should be securely seated with the sensor in contact
with the liquid line. If working on a package unit
make sure you are at least 6 inches away from the
compressor.
Figure 15. ATC1 pipe clamp thermocouple attached to a pipe correctly.
Answering Yes or No takes you to a
different INPUT FORM. Always use
the manufacturer's recommended
subcooling when available.
Target SC must be entered from the
equipment specifications.
Can be measured automatically with
Fieldpiece accessory heads.
Units can be changed to either English
or Metric.
Without manufacturer's recommended
subcooling data, the HVAC Guide TM
tester makes a conservative Target SC
estimate.
Can be measured automatically with
Fieldpiece accessory heads.
Current time is set within TIME switch
position (see page 52).