Bacharach PCA 2 24-9448, Operating & Maintenance Instructions, Page: 11 / 108

Instruction 24-9448 1-5
Introduction
1.4 Operational Overview
The PCA 2 s powered by ether ts 4 nternal batteres, or by an optonal
AC power adapter that operates from any convenent source of 100–
240 VAC, 50/60 Hz power. The type of batteres used can be ether dspos-
able alkalne or rechargeable NMH. Note that rechargeable batteres can
be charged nsde the analyzer usng the optonal AC power adapter.
The PCA 2 s controlled by 11 front panel push buttons, whle a graphcal
LCD s used to dsplay all combuston and emsson test data and analyzer
parameters.
A probe and hose assembly, wth an ntegral thermocouple and flter/wa-
ter-trap connect to the bottom of the analyzer, thus provdng the means of
drawng n gas samples, and for measurng stack temperature and draft.
The PCA 2 s turned ON by pressng ts red
I/O
button. A warm-up perod
of 60 seconds then begns, durng whch tme the analyzer performs self
dagnostcs. At the end of the warm-up perod, f no errors were detected
the message “NO ERRORS DETECTED” s brefly dsplayed followed by
the dsplay of the Combuston Test HOLD screen. If errors were detected,
the message “ERRORS DETECTED” s dsplayed along wth a lst of the
errors. These errors must be corrected before proceedng wth the combus-
ton test.
Before startng a test be sure to select the fuel beng burned. The default
fuel selected s Natural Gas. Note that the name of the fuel beng burned
s ndcated at the top of the dsplay. To change the fuel: frst, press the
MENU
(
F2
) button; next, select
FUEL
from the menu; then use the but-
tons to hghlght the fuel beng burned; and fnally, press the green
ENT
button to select the hghlghted fuel.
To assure correct combuston-effcency calculatons, the analyzer must
know the burner’s prmary-ar temperature. The analyzer normally uses
ts nternal temperature sensor for the prmary-ar temperature value, but
ths method s only acceptable f the burner s usng ambent room ar. If
the burner s drawng n cold outsde ar, we recommend that the optonal T-
AIR thermocouple be used. Ths thermocouple plugs nto the bottom of the
analyzer and s placed n the burner’s prmary-ar stream.
Begn the combuston test by frst nsertng the analyzer’s probe tube nto
the stack-gas stream of the applance under test, and then pressng the
RUN/HOLD
button to dsplay the Combuston Test RUN screen. The ana-
lyzer wll begn to contnuously montor the stack temperature, %O
2
and