Slant/Fin SF-10 Operation And Instruction Manual page 5

MODE 2
(Setpoint and DHW Operation with Primary / Secondary Piping)
Mode 2 is designed for setpoint and domestic hot water (DHW) operation
using primary / secondary piping. Once a heat demand signal is present,
the control operates the boiler burner to maintain the boiler target at the
boiler supply 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 supply 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 indirect domestic hot water operation.
MODE 3
(Outdoor Reset and DHW Operation with Parallel Piping)
Mode 3 is designed for outdoor reset and domestic hot water (DHW)
operation using parallel piping. Once a heat demand is present, the
control operates the boiler burner to maintain the calculated outdoor reset
target at the boiler outlet sensor. Refer to section C for a description of
outdoor reset 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.
MODE 4
(Outdoor Reset and DHW Operation with Primary / Secondary Piping)
Mode 4 is designed for outdoor reset and domestic hot water (DHW)
operation using primary / secondary piping. Once a heat demand is
present, the control operates the boiler burner to maintain the calculated
outdoor reset target at the boiler supply sensor. Refer to section C for a
description of outdoor reset operation.
Once a DHW demand is present, the control operates the boiler burner to
maintain the DHW target at the boiler supply 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 indirect domestic hot water operation.
MODE 5
(External Target Temperature Input and DHW Operation –Parallel Piping)
Mode 5 is designed for an external input signal and domestic hot water
(DHW) with parallel piping. The external input signal can be provided from
a BMS, an EMS, or a tekmar tN4 System Control. The external input
signal creates an internal demand and changes the boiler target accord-
ing to a linear scale. The control operates the boiler burner to maintain the
boiler target at the boiler outlet sensor. Refer to section D for a description
of external target temperature 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.
DHW Tank
BTC
DHW Tank
External
0 - 10 V (dc)
Control
Temperature Target
Model SF-10 Control Instructions Manual
BTC
Boiler Boiler
Supply Outlet
Sensor Sensor
Boiler Inlet Sensor
Outdoor
Sensor
DHW Tank
Boiler
Outlet
Sensor
Boiler Inlet Sensor
BTC
Outdoor
Sensor
Boiler Boiler
Outlet
Supply
Sensor Sensor
Boiler Inlet Sensor
BTC
DHW Tank
Boiler
Outlet
Sensor
Boiler Inlet Sensor
5