Fieldpiece HG2 - HVAC Guide System Analyzer - Manual (Page 10)

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2.2 Superheat INPUT FORM
Figure 7. INPUT FORM for Standard Table Superheat Test.
Figure 8. INPUT FORM for Custom Table Superheat Test.
SH Table: Default: “Standard” uses the target super-
heat table from Title 24 for fi xed restrictor systems.
Other selection: “Custom” allows you to enter your
own target superheat by displaying the
Target SH
input.
Target SH (Custom SH Table ): Change the SH Ta-
ble to Custom and enter the manufacturer’s recom-
mended superheat in the
Target SH input.
Refrigerant: Default: R-22. Other selections: R-410A,
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.
OD Dry Bulb (outdoor dry bulb, Standard SH Ta-
ble ): Clip a calibrated ATA1 to the inlet of the con-
denser fi ns (typically on the side of the condenser),
in the shade if possible. Note that the temperature of
the air entering the outdoor coil can be considerably
diff erent than the ambient temperature due to recir-
culation of air exiting the unit. Determine the aver-
age temperature of the air entering the condenser.
ID Wet Bulb (indoor wet bulb, Standard SH Table ):
Take measurements very close or within the return
air side of the inlet to the air handler (not at the re-
turn grill since temperatures change by the time the
air reaches the indoor coil). Wet the wet bulb sensor
(ATWB1) and insert it aft er 15 minutes of continu-
ous running. Clip downstream of the fi lter if the
fi lter is just before the air handler. Clip on the side
facing the evaporator and take the measurements.
If the fi lter is not before the evaporator, make small
holes in the return plenum just big enough for the
probes. Seal any holes before leaving the jobsite.
Watch the wet bulb temperature; it will drop and
then stabilize. Th
e wet bulb temperature is the sta-
bilized reading. If the sensor starts to dry out, the
reading will rise and the wrong temperature will be
recorded.
SL Pressure (suction line pressure): Connect the
ASX14 to the suction side service port. Select pres-
sure mode on the ASX14 head. Th
e system must be
stabilized before taking the measurements. 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.
SL Temp (suction line temperature): Measure near SL
service port (within 6 inches). 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
suction line. If working on a package unit make sure
you are at least 6 inches away from the compressor.
Figure 9. ATC1 pipe clamp thermocouple attached to a pipe correctly. Fi 9 ATC1 i l th l tt h d t i tl
Standard table uses the Title 24 target
superheat table.
Customer ID is useful for record keeping.
Can be measured automatically with
Fieldpiece accessory heads.
Custom table allows you to enter your
own target superheat value.
Can be measured automatically with
Fieldpiece accessory heads.
Units can be changed to either English
or Metric.