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9. Remove the combustion analyzer probe
from the vent hole. Seal the probe hole and
replace the vent connection cover.
4.6 OVER TEMPERATURE LIMIT SWITCH
ADJUSTMENTS
There are two Over-Temperature Limit switches
that turn off the unit when the outlet water
temperature becomes too hot. The lower over-
temperature limit switch is adjustable and should
0
o
be adjusted 20
to 40
F above the operating
header temperature. The upper over-
temperature limit switch is a manual reset device
and is not adjustable. It will shut the unit off if the
water temperature reaches 240
attempt to adjust its set point.
To adjust the lower over temperature switch limit
switch:
1. Remove the wing nut from the top center of
the shell cap. Lift the cap off the shell.
2. The two over-temperature limit switches are
located at the top of the shell (see Fig. 4.6).
Do not adjust the upper switch it has been
factory preset. Adjust the lower switch
0
o
between 20
to 40
F higher than the
maximum header temperature the unit may
see.
3. Replace the shell cap and wing nut.
o
F. DO NOT
23
INITIAL START-UP
Figure 4.6
Over Temperature Limit Switch Location
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