Dry Contact For Clogged Filter Or Schedule Override; Static Pressure And Co2; Figure 13 - Connecting The Dry Contact Input To The Controller; Figure 14 - Connecting The Co2 And Pressure Sensors - Prolon M2000 Series Hardware Manual

Dry Contact for Clogged Filter or Schedule Override

Analog input 4 on the M2000 RTU can also be configured as a dry contact input for either a clogged filter
sensor or as a schedule override input. Please refer to Figure 13 to see proper connection.
• Clogged filter sensor: To indicate that the filter is clogged, the contact must be closed.
• Schedule Override: Closing the contact causes the M2000 to immediately return to occupied
mode from unoccupied mode. The M2000 remains in occupied mode as long as the contact is held
closed. If it was already in occupied mode, there is no change.

Figure 13 - Connecting the Dry Contact Input to the Controller

Static Pressure and CO2

Analog inputs 8 and 9 on the M2000 rooftop controller are dedicated to the CO2 and static pressure
sensors, respectively. By default, a 4-20 mA signal is expected for the CO2 input and a 0-5 VDC or 1-5 VDC
signal is expected for the static pressure input. However, this can be modified using the internal jumpers
(see p.8). Please refer to Figure 14 for correct wiring.
REV. 6.1.8 / PL-HRDW-RTU-M2000-C/F-EN
(-)
(+)
(-)
(+)

Figure 14 - Connecting the CO2 and Pressure Sensors

Clogged Filter
OR
Schedule
Override
Static Pressure Sensor
CO2 Sensor
13