6 720 607 679
8
Gas Type Conversion
A. Once Gas Pressure is adequate
B Press ON/OFF button to turn off the heater.
B Remove brass flat head screw on the exhaust collar
as seen in Fig. 5.
B Insert CO
2
analyzer probe into the measuring port.
The tip of the probe should be in the center of the flue
pipe (approx 1.5" inserted). Avoid air gaps between
probe and measuring port as they can alter readings.
Fig. 15 Measuring port
B While holding the Program (P) button in, press the
ON/OFF button to turn ON the heater (see Fig. 6).
As soon as ‘188’ flashes on the display, release the
Program button. The display should now read P2.
Press ‘ ’ button until “P1” appears on display.
Fig. 16
B. Measuring CO
2
(combustion cover must be
installed):
B Open all hot water taps to achieve a flow rate of at
least 6 gallons per minute. (1 tub and 2 sinks should
be sufficient). If heater display reverts back to P2,
open more hot water fixtures to allow sufficient flow.
B Press ‘ ’ until P1 reappears on display.
B Record the CO
2
reading in P1 below. (Analyzer
reading may take several minutes to stabilize).
B Press the ‘ ’ button until P2 appears. Unit will
ramp down to low fire and the flow should decrease.
B Record the CO
2
reading in P1 and P2 below.
P2 CO
2
Reading: % CO
2
P1 CO
2
Reading: % CO
2
Note: When making adjustments, make sure
combustion cover is installed.
Values for GWH 715 ES, GWH 2700 ES, Evolution 500,
940ES, 940ESO
CO
2
range (%)
Max. CO level
(measured)
Nat. Gas
max. input P1 7.5 % - 8.1 % < 250 ppm
min. input P2 2.3 % - 2.6 % < 60 ppm
LP Gas
max. input P1 8.7 % - 9.3 % < 250 ppm
min. input P2 2.7 % - 3.0 % < 60 ppm
* Values above are for climate controlled conditions. Inputs
such as gas pressure, heating value of the gas, humidity and
temperature of combustion air all impact CO and CO
2
values. Changes in these inputs can result in different CO
and CO
2
values on the same appliance.
Table 5 CO
2
& CO target numbers
Values for GWH 2400 ES, 830ES
CO
2
range (%)
Max. CO
level
(measured)
Nat. Gas
max. input P1 7.2 % - 7.8 % < 250 ppm
min. input P2 2.3 % - 2.6 % < 60 ppm
LP Gas
max. input P1 8.3 % - 8.9 % < 250 ppm
min. input P2 2.6 % - 2.9 % < 60 ppm
* Values above are for climate controlled conditions.
Inputs such as gas pressure, heating value of the gas,
humidity and temperature of combustion air all impact CO
and CO
2
values. Changes in these inputs can result in
different CO and CO
2
values on the same appliance.
Table 6 CO
2
& CO target numbers
(60 pages)
(28 pages)
(48 pages)
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