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Modu-Fire
®
Gas-Fired Boiler Installation
17
Analog Input Direct Drive
The firing rate of the boiler is controlled by an ex-
ternal analog signal, usually from a multiple boiler
control. The boiler turns on and off as directed by
the external control.
An operating limit control ensures that the boiler
temperature does not exceed the set value.
Refer also to Section 3.12.1B.
Use of the Controller
The diagram shows the RWF40 after switching on
power. This condition is called the basic display.
The actual value and the currently active setpoint
are shown here. Manual operation, self-setting, and
the user, parameter, and configuration levels can be
activated from here.
Operation of the Control
The temperature control has three levels of cascad-
ing menus. They are:
USER level,
PARAMETER level, and the
CONFIGURATION level.
The following table indicates the menu options
available from each level. The options available
depend on the operating mode of the boiler.
User Level:
To access the User level from the basic display
press PGM.
Change the setpoint SP1 with or .
Change to setpoint SP2 or dSP with PGM.
Change the setpoint SP2 or dSP with or .
Return to the basic display with EXIT.
Manual Operation of the Boiler
The boiler firing rate can be controlled manually.
Manual Opera-
tion
EXIT But-
ton
Operating Limit Closed
Firing Rate Decreasing
Firing Rate Increasing
Alarm Relay
Energized
Increase
Value
Actual Value
Display (red)
Setpoint
Display
(green)
Decrease
Value
PROGRAM
Button