Slant/Fin EM-10 Installation - Manual (Page 5)

5 EM-10-40 Operation and Instruction Manual
MODE 4
(Outdoor Reset and Setpoint with Parallel Piping)
Mode 4 is designed for outdoor reset and setpoint operation
using parallel piping. The heat demand is available to provide
outdoor reset for space heating systems. The
setpoint can be used to heat an indirect domestic hot
water tank.
Once a heat demand is present, the control stages the
boiler to maintain the calculated outdoor reset target at the
boiler outlet sensor. Refer to “Outdoor Reset Operation”
section for a description of outdoor reset operation.
Once a setpoint demand is present, the control stages the
boiler to maintain the boiler target at the boiler outlet sensor.
If both demands are present at the same time, the control
targets the higher of the two requirements. Refer to “Setpoint
Operation” section for a description of setpoint operation.
MODE 5 (Outdoor Reset and Setpoint with Primary/
Secondary Piping)
Mode 5 is designed for outdoor reset and setpoint operation
using primary / secondary piping. The heat demand is
available to provide outdoor reset for space heating systems.
The setpoint demand can be used to heat an indirect
domestic hot water tank.
Once a heat demand is present, the control stages the
boiler to maintain the calculated outdoor reset target at the
boiler supply sensor. Refer to “Outdoor Reset Operation”
section for a description of outdoor reset operation.
Once a setpoint demand is present, the control stages the
boiler to maintain the boiler target at the boiler supply
sensor. If both demands are present at the same time, the
control targets the higher of the two requirements. Refer to
section “Setpoint Operation” for a description of setpoint
operation.
BTC
Mode 5
Boiler
Outlet
Sensor
Boiler Inlet Sensor
Boiler
Supply
Sensor
Outdoor
Sensor
Relay
BTC
Mode 4
Relay
Boiler
Outlet
Sensor
Boiler Inlet Sensor
Outdoor
Sensor