3
GENERAL SEQUENCE OF OPERATION
GENERAL SEQUENCE OF OPERATION
When the GEN II-R controller is powered up, the total number of addressed dampers are determined and
verified on the display. This confirms the controller is communicating with all dampers in the system. If
there are no active heat or cool calls detected, the supply dampers will open in ventilation mode. The
system blower operation can be configured for constant ON or intermittent Auto.
The GEN II-R systems can be field configured for adjustable time based opposing call changeover or vote
based majority changeover. The GEN II-R controller is shipped from the factory for 10-minute opposing
call changeover. The GEN II-R controller “polls” the damper control boards once per minute to determine
the thermostat demand status for heat and cool. The heat and cool changeover functions will operate
according to changeover strategy selected. When the GEN II-R controller changes modes, a 5-minute
purge cycle is initiated before the changeover is completed.
On active heat or cool calls, the non-calling zones will close. When the last calling zone is satisfied in
either heat or cool mode, the GEN II-R controller terminates the HVAC outputs after the next “poll” and
the blower output will be de-energized (unless controller is configured for constant fan) for a 5-minute
purge cycle. During the purge cycle no heat or cool calls are recognized.
When the system is in the heating mode and calls for cooling are received, an opposing call timer strategy
operates. This timer is adjustable from 5 - 30 minutes. The factory default is 10 minutes. At the end of the
selected time period, if the opposing call is 3° away from set point, heating is turned off. After a 5-minute
purge mode, Cooling is turned on until the cool call is satisfied. If necessary, GEN II-R will return to the
heating mode, If all calls have been satisfied, dampers will open for ventilation. If the opposing zone strat-
egy is not desired, this feature may be disabled.
