Greenheck Melink IH3 Operations - Manual (Page 5)

IV. Operational Modes of the Intelli-Hood
There are four (4) Modes of the Intelli‐Hood. The Modes are defined below. Other sections of
the manual will describe more detail about how the Intelli‐Hood system changes modes.
Energy Saving Mode
Energy Saving Mode is the operational state when one or more exhaust fans are on. In most
cases, all exhaust fans controlled by Intelli‐Hood will be in Energy Saving Mode at the same time,
however, in some installations, it is possible that some fans be in Energy Saving Mode while others
remain in Standby.
Standby Mode
In Standby Mode, the exhaust fans are not operating, but Intelli‐Hood is monitoring
temperature and optic sensors. The Touchpads are typically used to manually change the mode of the
system between Standby and Energy Saving Mode. Depending on conditions detected by sensors and
programmable options, it is possible for Intelli‐Hood to automatically change modes.
100% Mode (Bypass)
100% Mode (also referred to as Bypass or Sensor Bypass) is a secondary function. Typically, the
Intelli‐Hood is set to appropriately send the exhaust fans to full speed based on conditions detected by
temperature and optic sensors. The kitchen staff person has the ability to send the fans to full speed by
placing the system into 100% Mode when it is currently operating in Energy Saving Mode. 100% Mode
is a timed function with a default expiration time of 10 minutes. After the timer expires, fans will revert
back to Energy Saving Mode.
Emergency Fire Mode
Emergency Fire Mode is triggered by the hood fire suppression system or other fire prevention
system of the building. This mode is activated when the main power (120 or 230 VAC single phase) to
the Intelli‐Hood System Controller is shut off. Through control wiring and programming of VFDs, the
exhaust fans are commanded to run at full speed. In most cases, supply fan VFDs are commanded to
stop running. In this mode, the Intelli‐Hood System Controller, User Interfaces and Hood Sensors have
no power and function.