Fieldpiece HG2 - HVAC Guide System Analyzer - Manual (Page 19)

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CheckMe!® INPUT FORM
Sys Type (System Type): Default: AC (Air Condition-
ing). Other selections: H Pump Heat (heat pump in
heating mode), H Pump Cool (heat pump in cool-
ing mode) or Geothermal.
Nom Ton: Nominal tonnage of the A/C system.
INDOOR UNIT
All temperature and pressure measurements must
be taken aft er the unit reaches steady state (generally 15
minutes of continuous operation).
Metering Device: Default: TXV/EXV. Other selec-
tion: Fixed.
ID Volt (indoor unit voltage): Default: 120V 1 phase.
Other selections: 240V 1 phase, 240V 3 phase, 460V
3 phase or 575V 3 phase.
Return DB (dry bulb) and Return WB (wet bulb):
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 sen-
sor (ATWB1) and insert it aft er 15 minutes of con-
tinuous running. Insert the dry bulb sensor (ATA1)
through the same hole. Th
ey can be clipped together
on the downstream side of the fi lter if the fi lter is
just before the air handler.
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. If the fi lter is not directly upstream of the
air handler, make small holes in the return plenum
just big enough for the probes. Seal any holes before
leaving the jobsite.
Supply DB (dry bulb leaving the indoor coil): Mea-
sure in the center of the supply plenum. Make a
small hole in the supply plenum and insert a cali-
brated dry bulb thermocouple such as the ATA1 or
ATB1. Determine the average air temperature in the
supply plenum.
OUTDOOR UNIT
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.
Rated Amps (Rated amperage of the outside unit):
Th is can be found on the nameplate along with the
outdoor voltage and the refrigerant.
OD Volts (outdoor unit voltage): Default: 240V 1phase.
Other selections: 120V 1 phase, 240V 3 phase, 460V
3 phase or 575V 3 phase.
Target Subcool: Manufacturer’s recommended
subcooling for TXV/EXV systems. Th is varies by
manufacturer , and may also change depending on
weather conditions. Always charge to the equip-
ment manufacturer’s specifi cations when available.
If no target subcooling is available then the HVAC
Guide
TM tester will make a conservative estimate.
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