INITIAL START-UP
4-6
4.4 UNIT REASSEMBLY
Once the combustion calibration adjustments
are properly set, the unit can be reassembled for
service operation.
1. Set the ON/OFF switch in the OFF position.
2. Disconnect AC power from the unit.
3. Shut off the gas supply to the unit.
4. Remove the manometer and barbed fittings
and reinstall the NPT plug using a suitable
pipe thread compound.
5. Remove the combustion analyzer probe
from the vent hole. Replace the NPT plug in
the vent hole using a suitable pipe joint
compound.
6. Replace the unit’s side panels and front
door.
4.5 OVER-TEMPERATURE LIMIT
RESET BUTTON FOR
MANUAL RESET
TEMPERATURE LIMIT
SWITCH
DIGITAL OVER-
TEMPERATURE
ALARM SWITCH
ADJUSTABLE
TEMPERATURE
LIMIT SWITCH
SWITCHES
The unit contains three (3) types of over-
temperature limit switches. These switches
consist of a manual reset switch, a rotary dial
adjustable switch and a digital alarm switch.
These switches are mounted on a plate as
shown in Figure 4-5. The switches can be
accessed by opening the front panel door of the
unit.
The manual reset switch is not adjustable and is
permanently fixed at 210°F. This switch will shut
Figure 4-5
Over Temperature Limit Switch
Locations
4.5.1 Digital Alarm Switch Checks and
Adjustments
The digital alarm switch settings can be checked
or adjusted using the controls and display on the
front panel of the switch illustrated and
described in Figure 4-6 and Table 4-2
temperature exceeds 210°F. Following an over-
by pressing the manual reset button shown in
Figurer 4-5 before the boiler can be restarted.
The rotary dial over-temperature switch is
manually adjustable from xxx to yyy ºF. This
switch allows the boiler to restart, once the
temperature drops below the selected
Alarm
F
Limit Control
Figure 4-6
RST
SET
temperature setting on the dial. Set the dial on
this over-temperature switch to the desired
setting.
The digital alarm switch shown in Figures 4-5
and 4-6 is preset at the factory to 210ºF and
should not be changed. If an over-temperature
condition is detected, this switch automatically
shuts down the boiler and sounds an audible
alarm. If desired, the over-temperature alarm
switch settings can be checked or adjusted
using the procedure in paragraph 4.5.1.
Digital Alarm Switch Front Panel
Содержание Benchmark 3.0LN Series
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