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Operating Modes
Mode 1 – (H7 and WH1 models) Setpoint operation
using primary piping. The heater outlet water temper-
ature is controlled to the boiler target setpoint. See Fig.
27.
Mode 2 – Setpoint operation using primary/secondary
piping. The control operates the heater to satisfy a
remote system sensor. The heater is turned off based
on boiler max and boiler differential (factory default H7,
P and WHP boilers). See Fig. 28.
Mode 3 – Dedicated DHW operation using UniTemp
80 piping. A call for heat is determined by the DHW
sen-sor and the DHW boiler target. The heater outlet
water is also controlled to the boiler target temperature
(factory default WH1 water heaters). See Fig. 29.
Mode 4 – Outdoor reset using primary piping. The
heater is operated as in Mode 1. However the target
temperature is based on outdoor reset. See Fig. 30.
Fig. 27: Mode 1 Primary Piping
Fig. 28: Mode 2 Primary/Secondary Piping
Fig. 29: Mode 3 Dedicated DHW