CenCon
44
S-XM
For control of gas fired SH and SHX humidifiers.
BASIC OPERATION
The S-XM expansion module controls the operation of SH and SHX series gas fired humidifiers. This includes
tank water fill and drain and burner control. On a call for humidification the tank first fills with water, then
the burner gas-fired heat is enabled to produce steam. Water level is controlled by the water level probes.
Water quality dictates the minimum tank drain cycle times. Drain temperature is monitored and cooled with
the supply water if required.
S-XM TIMING
Dump Schedule (ppm of calcium
carbonate – pre-programmed)
Less than 60 ppm = 30 hours
60 – 119 ppm = 20 hours
120 – 179 = 15 hours
180 or greater = 10 hours
Drain initiation contact (OCC)
confirm delay time
30 seconds
Drain time
SH_240 and smaller = 20 minutes
SH_400 and larger = 40 minutes
Fill time
30 – 60 minutes
Pilot opening time
10 seconds
Improper gas valve wiring alarm
2 seconds