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3.12 Supply Water Thermostat
(SWT) Settings Above 180°F
The adjustable SWT knob includes a factory instal-
led rotation stop that prevents supply water tempe-
rature settings below 140°F or above 180°F. Under
no circumstances should the SWT knob be modi-
fi ed to allow temperature settings below 140°F.
Lower settings may allow corrosive condensation
from fl ue products, decreasing the life of the boiler.
Some applications may call for supply water
temperature settings above 180°F. For these appli-
cations, the SWT rotation stop may be modifi ed to
allow the SWT to be set as high as 194°F. (Note:
modifying the stop to allow higher maximum set-
ting will also result in a corresponding increase in
the minimum SWT temperature setting.) Follow the
steps below to reset the SWT rotation stop to allow
water temperature settings up 194°F:
1. Remove the knob from the adjustable SWT by
pulling the knob directly outward away from
the boiler.
Figure 66
2. Look on the back of the knob and fi nd the
metal rotation stop in one of the numbered
positions (see Figure 66). This metal stop
should have been factory set to position 1
or 7.
3. Remove the metal stop from the knob by gra-
sping it fi rmly with needle nose pliers and
pulling it directly outward. See Figure 67.
4. Place the metal stop in position 5 by grasping
it fi rmly with needle nose pliers (see Figure
68) and pushing it directly inward. Note:
Positions 1, 5 and 7 are the only approved
locations for the SWT rotation stop.
5. Replace the modifi ed knob by aligning
with the fl at on the shaft of the SWT and
pushing fi rmly on the SWT. Make sure
that the indicator mark on the front of the
knob is between the proper modifi ed set-
ting range as marked on the boiler. If not,
remove the knob and rotate the shaft of the
SWT as appropriate so that the indicated
adjustment range will be between approxi-
mately 155°F and 195°F.
Figure 67
Figure 68
18-CG03D1-4
51
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