PV500-2 06/10
5
Section 2
4. After 20 to 30 minutes of operation or when water in
the tank is above 120°F, insert CO (carbon monoxide)
tester in flue damper opening under the draft diverter
(125 gallon models) or in the flue collector opening
(250 gallon models). CO reading must be less than
.02% (or 200 ppm).
5. Insert
CO
2
(carbon dioxide) tester in the flue damper
opening under the draft diverter (125 gallon models)
or in the flue collector opening (250 gallon models)
and take reading. CO
2
should be 6 to 8%.
NOTE:
Monitoring CO and CO
2
readings in vent after the
draft diverter will give erroneous readings. These
measurements must be taken as flue gases exit the
heater flue collector under the draft diverter as
dilution with ambient air from the draft diverter occurs
in the vent.
6. Insert temperature gauge in ¼" hole and read vent
temperature. Temperature should be at least 300°F
but less than the room temperature plus 400°F when
the water temperature is approximately 130°F.
7. Connect micro-amp meter as shown in Figure 2-6 and
check micro-amps. A minimum of two micro-amps is
required for proper operation.
8. Record the following information for future use:
A. Inlet gas pressure ________________"W.C.
B. Gas pressure, manifold (step 2) _____ "W.C.
C. Vent draft (step 3) ________________"W.C.
(should be minimum of 1 in. W.C.)
D. CO reading (step 4) ______% (less than .02%)
E. CO
2
reading (step 5) __________% (6-8%)
F. Vent gas temperature (step 6)
Gross__________________
F.
Less Ambient____________°F.
Net____________________°F.
G. Micro-amps reading (step 7)______________.
COMBINATION GAS VALVE
Figure 2-5
MICRO-AMP METER HOOK-UP
Figure 2-6
