Sequence Of Operation; Section A: General; Section B: Setpoint; Section C: Outdoor Reset - Slant/Fin SF-10 Operation And Instruction Manual

Sequence of Operation

Section A
General
Operation
Page 4 - 8
Section F
Indirect DHW
Operation
Page 11 - 12

Section A: General

POWERING UP THE CONTROL
When the control is powered up, the control turns on all segments in the display for 2 seconds. Next, the software version is
displayed for 2 seconds. Last, the control enters into the normal operating mode.
DISPLAY BACKLIGHT
The control's display has a backlight that is permanently on while the control is powered.
PIPING
The boiler can be piped in parallel or in primary / secondary to the system. The type of piping chosen affects the location of
the control's operating temperature sensor. The control can either use the boiler outlet sensor or the boiler supply sensor.
PARALLEL PIPING
In parallel piping applications, the boiler outlet temperature is typically the same as that
delivered to the system. Therefore the operating temperature sensor is the boiler outlet sensor.
PRIMARY / SECONDARY PIPING
In primary / secondary applications, the boiler outlet temperature (primary loop) is
typically hotter than the system supply temperature (secondary loop). This occurs when the
system supply pipe has a larger flow rate than the boiler outlet pipe. Therefore, the
control requires an additional sensor (boiler supply) to measure the temperature delivered out
to the system. The operating temperature sensor is the boiler supply sensor.
MODES OF OPERATION (MODE)
The control allows for seven modes of operation in order to define the control operation and piping arrangement used.
The piping arrangement can be categorized into parallel and primary / secondary. The mode of operation is selected using the
MODE item in the Adjust menu. The temperature being controlled out to the heating system is measured by the operating sensor.
The piping arrangement determines which sensor the control uses as the operating sensor. The operating sensor is either the boil-
er outlet sensor or the boiler supply sensor.
MODES 1
(Setpoint and DHW Operation with Parallel Piping)
Mode 1 is designed for setpoint and domestic hot water (DHW) operation
using parallel piping. Once a heat demand signal is present, the
control operates the boiler burner to maintain the boiler target at the boil-
er outlet sensor. Refer to section B for a description of setpoint operation.
Once a DHW demand is present, the control operates the boiler burner to
maintain the DHW target at the boiler outlet sensor. If both a heat demand
and a DHW demand are present at the same time, the control targets the
higher of the two requirements. Refer to section F for a description of indi-
rect domestic hot water operation.
4 Model SF-10 Control Instructions Manual
Section B
Setpoint Outdoor Reset
Operation
Page 8
Section C
External Temp.
Operation
Page 9
Section D
External Direct
Target Input Drive Operation
Page 10
Boiler
Outlet
Sensor
Boiler
Inlet
Sensor
Boiler Boiler
Supply Outlet
Sensor Sensor
Boiler
Inlet
Sensor
BTC
DHW Tank
Boiler Inlet Sensor
Section E
Page 11
Boiler
Outlet
Sensor