22
ULTRA-SORB MODEL MP INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
AIRFLOW PROVING SWITCH
An air fl ow proving switch should be used to prevent the steam valve from
opening if air is not moving in the duct.
HIGH LIMIT HUMIDISTAT
To prevent over saturation when duct air is cooler than 70 °F (21 °C), use a
high limit (duct mounted) humidistat (Figure 10-1). Mount it 10' to 15' (3 to
4.5 m) downstream from the Ultra-sorb panel, and set it at 80 to 90% RH.
Controls
OPERATION
FIGURE 22-1: ULTRA-SORB MODEL MP TYPICAL CONTROL WIRING
2-10 VDC
REVERSE ACTING
SIGNAL FROM BAS
OR HUMIDISTAT
MODULATING STEAM
CONTROL VALVE
2-10 VDC SIGNAL
