Use and Care Manual

30
110637-01 - 5/20
RRO Installation & Service Manual
10 Operating (continued)
thermostat is satisfied. Optionally, the
thermal purge (circulator pre-purge time)
maybe added adjusting the Circulator
Pre-purge time parameter. This feature
saves energy by starting the circulator and
delaying the burner start when there is
residual heat available in the boiler.
d. If the thermostat is not satisfied and the
Operating Setpoint (SP) is reached the
system circulator will continue to operate
and the burner will stop. When the boiler
water temperature drops below the setpoint
less the differential setting the burner will
restart.
e. After the thermostat is satisfied the burner
and circulator are stopped.
f. The Warm Start Boiler Control also includes
a low limit control function. When the
boiler water temperature falls below the
Low Limit Setpoint less the Low Limit
Differential the “ZC” terminal and System
Circulator outputs are de-energized and
the oil primary is energized to start the
burner. As temperature rises above the Low
Limit Setpoint the burner is stopped, the
“ZC” output is energized and the System
Circulator is enabled to run in response to a
call for heat.
g. On burner start, if the CAD cell does not
see flame within approximately 15 seconds,
primary control will shut down the burner
and enter into a lockout mode. A lockout is
reset by pressing the reset button located
on the primary control. If the flame is lost
while the burner is firing, the primary control
shuts down the burner, enters a 60 second
recycle delay, and repeats the ignition
sequence. If after three (3) trials for ignition,
flame is not detected, primary control will
enter into restricted mode. Restricted mode
is reset by holding down the reset button for
15 seconds.
3. Using Cold or Warm Start Boiler Control
(Boiler Control) Features
The Boiler Control is located on front of boiler.
The Boiler Control display, along with Up
ñ,
Down ò, and “I” keys may be used to view
boiler operating status (Figure 10-3).
4. Viewing the Operating Mode Options
In operating mode the user may view (but not
change) boiler operating status, settings and
troubleshooting information. To view Boiler
Control display information:
Press and release the “I” key on the Boiler
Control to change from one parameter to
the next. Each setting will alternately flash
between the relevant display code and its
corresponding value.
For example, when the “I” key is pressed
on the Boiler Control until “bt” is displayed,
it will then flash a three digit number (such
as “0”) followed by either “F” (or “C”). This
indicates that the boiler water temperature is
180°F. Other operating parameters display the
information in a similar fashion.
Please note that in operating mode to hold the
display on the value the user can press and
hold either the Up ñ or Down ò keys and the
value will be continuously shown. This may be
helpful in watching a value “live”.
Figure 10-3: Boiler Control
Key Function & Orientation