Carrier Weathermaster 48P030-100 Controls, Start-Up, Operation, Service, And Troubleshooting page 138

Fig. 22 — RXB, EXB, CEM, SCB Input/Output Connections
138
V RELATIVE HUMIDITY
ACM
0
POWER SUPPLY
24VDC
V
ACL
0
If the Humidity sensors (supplied or field
provided) indicate swings in relative
humidity, a local 24 vdc power supply
should be field installed to level out the
reading from the device.