Installation Manual

6 720 644 930
Installation instructions
19
Fig. 26 Combustion air piping not shown for clarity
purposes
Good - Vertical directly on top of the heater.
Better - Closer to the termination horizontally installed in a condi-
tioned space.
Best - Closer to the termination vertically installed in a conditioned
space.
3.3.7 Fan speed adjustment
IMPORTANT! Installation adjustment:
After installing the water heater, the fan speed values for
minimum power (P2) and maximum power (P1) may
need adjustment due to variations in altitude and vent
pipe length.
Failure to make necessary adjustments to fan speed
values may result in improper operation of the
appliance.
First calculate the total equivalent vent length. This is
the straight pipe length of both exhaust and combustion
air plus the number of elbows used. To determine the
length equivalency of each elbow refer to table 6.
Use the equivalent vent length value to determine the
appropriate fan speed values found in Table 19 and
20. Refer to page 21 on how to adjust the fan speeds
if an adjustment is necessary. After changing fan speed
values, proceed to section 6.4 to confirm CO2 values
are within specified ranges.
Preferreddamperpositionforverticalterminations
Unconditioned
space.Donot
installdamper.
Enclosedvent
pipe.Donot
installdamper.
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