option is relay level. This is used for multi-speed fan configurations where it is necessary to
turn off lower level relays when higher level relays turn on. After configuring the relay settings,
sensors are assigned to one or more relays to ascertain the gas values that will be used to
trigger connected ventilation equipment.
Zones
Unlike sensors and relays, zones are not a physical object. Instead, zones are used to group
relays together that control a particular area. This allows multiple fans, or multi-speed fans, to
be controlled in sequence. The
Home Screen
of the control panel scrolls through all
configured zones and displays the aggregated information, providing a quick and easy way to
see the status of the entire system. Each zone also has its own alarm setpoint and on-delay
that is used for the internal alarm.
Overrides
In addition to triggering relays via gas concentrations and setpoints, each relay can also be
manually or automatically overridden. Manual override allows the user to activate or
deactivate a relay either for an adjustable duration or until reset by the user. Automatic
override allows the user to schedule days and times when the relays will activate or deactivate,
regardless of the gas concentration.
Analog Output
Each GDCP-Touch and GDCP-ExpansionPack is equipped with one analog output that
generates a 4-20 mA, 2-10 VDC, 1-5 VDC, or 0.2-1 VDC signal. This signal is proportional to
the average concentration of target gas present in the assigned zone. It may be used for
monitoring gas or for controlling a VFD. Not all systems will accept this signal directly and may
need an intermediary controller.
Modbus Output
This control panel system uses Modbus RTU for communication. A third-party BMS or DDCS
can be configured to communicate with the system. Available information includes gas
concentration, sensor types, errors present, relay states, and more. There is no configuration
required for this output at the control panel.
BACnet IP Output
The IP address, subnet mask, gateway address, and DHCP can all be configured under the
BACnet Settings
page to enable communication over BACnet IP. The information available
from the control panel is the same as with Modbus.
IOM03
Rev 1.1 – May 18, 2021
24
