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Gas Conversion Kit Manual

ManualsBrandsBosch ManualsPlumbingTherm 18" Natural Gas Tankless Water Heater With 175,000 Max Input BTU, Non Condensing Technology, 150 PSI Max Water Pressure, Energy Star Rated, Electronic Ignition, In Grey
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6 720 607 679
Gas Type Conversion
9
C. Adjusting CO
2
:
Note: P1 adjustment will change the P2 reading.
Confirm the P1 value BEFORE adjusting the P2 level.
1. If P1 CO
2
level is off:
B Loosen yellow painted philips screw (1) and cover
should rotate down (2) revealing a recessed brass
slotted screw. Fig. 17.
B Turning the slotted screw counter clockwise will
raise P1 CO
2
levels and clockwise will lower P1
CO
2
levels. Adjustments to the slotted screw will
also change P2 CO
2
levels.
B After the P1 CO
2
readings are correct, press the
‘ ’ button to enter the P2 mode. Verify CO
2
readings in P2 mode.
Fig. 17 Adjusting P1 CO
2
level
2. If P2 CO
2
level is off:
B Remove yellow painted #40 Torx cover from the front
of the gas valve. (Fig. 18, pos.1) A plastic #40 Torx
screw will be revealed.
B Turning the plastic #40 Torx screw counter
clockwise will lower P2 CO
2
levels and clockwise
will raise P2 CO
2
levels. (Fig. 18, pos. 2).
Note: This screw adjustment is very sensitive and
should be made in small increments. It may take several
minutes for readings to stabilize.
Fig. 18 Adjusting P2 CO
2
level
Final Readings
P2 CO
2
Reading: % CO
2
P1 CO
2
Reading: % CO
2
3. Verify both P1 and P2 CO
2
readings are within the
ranges specified in table 5 or 6. Repeat steps 1 and 2
as necesssary until CO
2
values are within the specified
ranges.
4. Once CO
2
values are within the specified ranges,
measure the CO readings on P1 and P2. These
readings can’t exceed the values shown in table 5 or 6
according to your appliance. If values exceed this limit,
inspect vent system and heat exchanger fin coils for
blockage.
D. Returning to Service:
1. Return slotted screw cover to original position and
tighten philips screw.
2. Reinstall Torx cover.
3. Remove CO
2
analyzer probe and reinstall flathead
screw with gasket in exhaust collar.
4. Apply conversion sticker to the right side of front
cover above rating plate sticker. Ensure information is
filled out accurately.
5. Press ON/OFF button to turn OFF the heater and
then turn ON the heater.
6. Heater is ready for normal operation.
6720607679-10.1AL
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