System Operation
4.9.3 Heater Operation
The heater will activate when the indoor temperature reaches a predetermined level below the setpoint (default
29°F). The heater will then run until the temperature is a certain level above the on point (default 3°F). These
settings can be configured under “Heater” in the Unit Configuration Menu.
Figure 4-15 Heater Operation Logic
4.9.4 Dehumidification
Dehumidification using the compressor or heater is available using the compressor or heater. It can be enabled
under “Dehumidification” in the Unit Config Menu. When the humidity reading from the controller exceeds a
threshold (default 15% above target), dehumidification will activate. The heater will activate if the indoor
temperature is below a certain level (default 11°F below setpoint). Otherwise, the compressor will be used to
dehumidify. Dehumidification will stay active until the target is reached (default 55%).
Figure 4-16 Dehumidification Logic
4.9.5 Generator Run
If a generator run circuit is installed, the system can be set to limit free cooling and compressor speed when
the generator is running. When the alarm signal is received, compressor speed will be limited to a default of
80%. This can be changed under “Generator run” in the Unit Configuration Menu. Free cooling is not limited
by default but can be disabled during generator operation to stop diesel fumes from entering the site. This
setting can also be changed under “Generator run” in the Unit Configuration Menu.
4.9.6 Emergency Ventilation
When the indoor temperature is a much higher than the setpoint (default 14°F), emergency ventilation will
start. The compressor will operate at full speed and the damper will open unless it is completely disabled.
Emergency ventilation will continue to operate until the temperature is below a cutoff point (default 9°F below
activation) at which the system will return to normal operation.
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