Slant/Fin EM-10 Service Manual - Manual (Page 27)

27 EM-40-SM Service Manual
Applications
Mode 6 and 7 – External Target Temperature Input and Setpoint Operation
Mode 6 – External Target Temperature Input and
Setpoint with Parallel Piping
The control receives a heat demand provided from an
external target temperature input signal. The control turns
on the boiler pump and operates the boiler to maintain the
target temperature at the boiler outlet sensor. The control
receives a setpoint demand from a DHW aquastat. The
control turns on the boiler pump and operates the boiler to
maintain the setpoint boiler target temperature at the boiler
outlet sensor whenever a setpoint demand is present.
Note: An external relay is required to operate the DHW
pump and provide DHW priority if required by disabling
the boiler pump.
Mode 7 – External Target Temperature Input and
Setpoint with Primary – Secondary Piping
The control receives a heat demand provided from an
external target temperature input signal. The control turns
on the boiler pump and operates the boiler to maintain the
target temperature at the boiler supply sensor. The control
receives a setpoint demand from an external control. The
control turns on the boiler pump and operates the boiler to
maintain the setpoint boiler target temperature at the boiler
supply sensor whenever a setpoint demand is present.
BTC
Mode 6
EMS
0-10 V (dc)
Relay
Boiler Inlet Sensor (Included)
Factory
Installed
Boiler
Outlet
Sensor
BTC
Mode 7
0-10 V (dc)
tN4 System
Control
Relay
Boiler Inlet Sensor (Optional)
Factory
Installed
Boiler
Outlet
Sensor
Secondary
Piping
Sensor
(Included)
External
Control
Sensor