Operating Sequence; General; Occupied Mode; Unoccupied Mode - Prolon M2000 Series Hardware Manual

Operating Sequence

General

The ProLon M2000 RTU Rooftop controller receives readings from five different temperature sensors:
outside air, return air, supply air, mixed air and zone air. In addition to the temperature sensors, it also has
inputs for the static pressure, CO2 levels and proof of fan. It operates on a configurable schedule using an
internal real time clock. Also, as a Master device, it receives data from the zone controllers sent over the
network bus. The controller then analyzes all the data and demands sent by the zones and commands the
appropriate outputs to respond accordingly, within parameters set by the temperature sensors and other
safety limits. The Master sends back information on its network such as supply air temperature, occupan-
cy status and other relevant data for the zone controllers to use.

Occupied Mode

The controller operates the fan. When there is a cooling demand from the zones, the Rooftop controller
will activate the cooling outputs as long as all temperature limits, delays and other related parameters
are respected. Once the demand is satisfied, the outputs are deactivated within the prescribed minimum
on/off time delays.
When there is a heating demand from the zones, the Rooftop controller will activate the heating outputs
as long as all temperature limits, delays and other related parameters are respected. Once the demand is
satisfied, the outputs are deactivated within the prescribed minimum on/off time delays.
When the CO2 levels become too high, the Rooftop controller will open the outside air damper as long as
all temperature limits, delays and other related parameters are respected. Once the CO2 levels return to
normal, the outside air damper returns to its previous position.
When there is no cooling or heating demand from the zones, only the fan is enabled. If the heating equip-
ment permits, a supply air pre-heating sequence may be enabled. This allows cold mixed air to be heated
to a more comfortable level for subsequent use by the zones for ventilation.

Unoccupied Mode

The fan can be configured to operate in intermittent mode. When there is a cooling or heating demand
from any single zone, the Rooftop controller will activate the fan and the necessary cooling or heating
outputs as long as all temperature limits, delays and other related parameter are respected. Once the
demand is satisfied, the fan and any cooling/heating outputs are deactivated within the min. on/off time
delays set.
During the unoccupied period, the Rooftop controller can be driven by the highest demand on the
network and will operate the fan and relevant outputs accordingly.
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REV. 6.1.8 / PL-HRDW-RTU-M2000-C/F-EN