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Mode 5 – Outdoor reset using primary/secondary pip-
ing. The heater is operated as in Mode 2. However, the
target temperature is based on outdoor reset. See Fig.
31.
Mode 6 – Designed for an external input signal with
primary piping. The external input signal can be pro-
vided from a BMS, an EMS or a sequencing control.
The external input signal changes the boiler target
according to a linear scale. The control operates the
boiler burner to maintain the boiler target at the boiler
outlet sensor. See Fig. 32.
Mode 7 – Designed for an external input signal with
primary/secondary piping. The external input signal
can be provided from a BMS, an EMS or a sequenc-
ing control. The external input signal changes the
boiler target according to a linear scale. The control
operates the boiler burner to maintain the boiler target
at the remote system sensor. See Fig. 33.
Mode 8 – This mode is used for remote control mode.
The Boil Max setting is the heater shutdown tempera-
ture.
Fig. 31: Mode 5 Primary/Secondary Piping with
Outdoor Reset
Fig. 32: Mode 6 Primary Piping with External Target
Temp
Fig. 33: Mode 7 Primary/Secondary Piping with
External Target Temp