Defaults - RBI IEW-199 Installation And Operation Instructions Manual

BOILER CONTROL: INTERNAL WIRING & OPERATION
g. As the DHW tank approaches setpoint, the input
rates will be modulated until the modulation rate
of the boilers drop below the Next Boiler Stop
Rate. Then the master boiler shuts down the last
boiler that started.
h. The Calculated Setpoint Max Offset Up and
Calculated Setpoint Max Offset Down are applied
to individual boilers in multiple boiler cascade
operation.
• These temperature offset values are used to
change the response of individual boilers to
the system setpoint.
• Increasing either of these values will cause the
system to react more quickly, but may result in
frequent cycling.
• Decreasing these values will cause the system
to react more slowly to achieve the setpoint.
• By increasing the Calculated Setpoint Max
Offset Up value, the Master boiler will offset
individual boilers setpoint temperature by a
larger amount in order to achieve the tank
setpoint.
• By increasing the Calculated Setpoint Max
Offset Down value, the master boiler will
decrease the boiler setpoints by a larger
amount to achieve the system setpoint.
i. The Rotation Interval is the frequency at which the
master boiler will change the lead boiler in the
sequence.
• For example, if the Rotation Interval is set to 4
days and there are 4 boilers operating together
the following chart shows the operating
sequence over the next 25 days.
Table 8.8: Rotation Interval Sequence
Days of Operation
1-5
6-10
11-15
16-20
21-25
36
Start/Stop Sequence
1-2-3-4
2-3-4-1
3-4-1-2
4-1-2-3
1-2-3-4
I.

DEFAULTS

1. Factory Defaults – Restore: By pressing the
"Select" key while in the "Factory Defaults" screen.
All factory settings will be restored on the control.
2. Site Defaults – Save: To save the current settings as
"Site Defaults," press the "Select" key while in the
following menu.
3. Site Defaults – Reset: To restore the "Site
Defaults," press the "Select" key while in the following
menu.