AERCO KC1000 Boiler equipped with C-More 2002 - Manual (Page 46)

INITIAL START-UP
4-6
4.5 UNIT REASSEMBLY
Once combustion calibration is set properly, the
unit can be reassembled for permanent
operation as follows:
1. Set the ON/OFF switch to the OFF position.
Disconnect the AC power supply from the
unit.
2. Shut off the gas supply to the unit.
3. Remove any regulator adjustment tools by
first pulling up the screwdriver blade to
disengage it from the regulator adjusting
screw, and then turning the tool out of the
top of the regulator.
4. Apply a drop of silicone adhesive to the
regulator adjusting screw to lock its setting.
5. Remove the gasket from the tool and place it
back onto the regulator cap.
6. Reinstall the cap and gasket back on the
regulator. Tighten the cap using a screw-
driver or wrench.
7. Remove all of the manometers and barbed
fittings and reinstall the pipe plugs using a
suitable thread compound.
8. Remove the combustion analyzer probe
from the vent hole. Seal the probe hole and
replace the vent connection cover.
9. Replace the unit’s panels and hood.
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
be adjusted 20
0
to 40
o
F above the operating
header temperature. The upper over-temper-
ature limit switch is a manual reset device and is
not adjustable. It will shut the unit off if the water
temperature reaches 240°F. DO NOT attempt to
adjust its setpoint.
To adjust the lower over temperature switch limit
switc
h:
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 attempt to adjust the upper switch. It
has been factory preset. Adjust the lower
switch between 20°F to 40°F higher than the
maximum header temperature the unit may
see.
3. Replace the shell cap and wing nut.
OVER-TEMPERATURE
SWITCHES
SHELL SENSOR
209
TEMPERATURE SWITCH DETAILS
137
HARNESS
136
FROM SHELL
NC
NC
C NO
C
LIQUID LEVEL SWITCH
OVER TEMP. SWITCH
Figure 4.6
Over Temperature Limit Switch Location