Slant/Fin EM-10 Service Manual - Manual (Page 4)

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 boiler outlet sensor or the boiler supply sensor.
MODE 1 (Two Setpoints with Parallel Piping)
Mode 1 is designed for setpoint operation using parallel
piping. The heat demand is available to activate a setpoint
for space heating systems. The setpoint demand is available
to activate a second setpoint for heating an indirect domestic
hot water tank.
Once a heat demand is present, the control stages the
boiler to maintain the boiler target 1 at the boiler outlet
sensor. Once a setpoint demand is present, the
control stages the boiler to maintain the boiler target 2 at the
boiler outlet sensor. If both demands are present, the control
operates at the higher of the two targets. Refer to section B
for a description of setpoint operation.
MODE 2 (Two Setpoints with Primary/Secondary Piping)
Mode 2 is designed for setpoint operation using primary /
secondary piping. A heat demand is available to activate
a setpoint for space heating systems. A setpoint demand
is available to activate a second setpoint for heating an
indirect domestic hot water tank.
Once a heat demand is present, the control stages the
boiler to maintain the boiler target 1 at the boiler supply
sensor. Once a setpoint demand is present, the
control stages the boiler to maintain the boiler target 2
at the boiler supply sensor. If both demands are
present, the control operates at the higher of the two targets.
Refer to section B for a description of setpoint
operation.
4 EM-40-SM Service Manual
Section A: General
Factory Installed
Boiler Outlet Sensor
Boiler Inlet Sensor (Included)
Factory Installed
Boiler Outlet Sensor
Secondary Piping
Sensor (Included)
Boiler Inlet Sensor (Included)
BTC
Mode 1
Relay
Factory
Installed
Boiler
Outlet
Sensor
Boiler Inlet Sensor (Included)
BTC
Mode 2
Zone Box
Relay
Factory
Installed
Boiler
Outlet
Sensor
Boiler Inlet Sensor (Optional)
Secondary
Piping
Sensor
(Included)