CenCon
50
P-XM
Pressure sensing module. The P-XM can output either a dry on/off contact or a modulating 0-10Vdc output
corresponding to 0-10mbar (0-4”wc) differential pressure.
BASIC OPERATION
The Pressure module will measure the required variable flow in a direct fired heater using the M-XM heating
module. The P-XM has an internally mounted air pressure sensor rated at an output of 0-10mbar (0-4”wc).
CAUTION: Do not blow into the pressure ports. Excessive pressure and moisture will damage it. The
ports are fragile and should not be tampered with.
At power start up, the P-XM will perform a snap check of the pressure sensor (near 0.0 pressure differential).
Primarily for testing for kinked tubing, if any pressure is present at the sensor the yellow light will turn on solid
for 2 seconds then revert to normal operation. It then ignores the pressure sensing output until after the
supply blower starts. It then ensures the pressure differential across the profile is within operating range
before allowing the heat to be enabled.
The CenCon air pressure monitoring system performs a time weighted calculation based on severity of change
to provide some protection against nuisance lock outs from various sources, such as wind gusts. Once the
airflow has stabilized, the timer is reset. For timing values refer to the M-XM alarm list.
Common contact input to Pressure Switch
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