35
Application Example
Steam humidification system controlled by a 0 to 10 Vdc valve wired to output #1. The humidity
sensor is located in the return air duct. A proportional high limit humidity sensor is installed in the
supply duct. An outdoor temperature sensor is installed in the fresh air duct.
Humidistat model number: H270-69-13-10-31
Figure 35-1. Alternative humidistat wiring A17898 (H270)
On/Off
High
Limit
Humidistat
(optional)
Air
Flow
Switch
(optional)
Main
Humidity
Sensor
Humidifier
Connections
Humidifier
Location
Outside
Air
Exhaust
Air
Humidifier
Connection
Terminals
24
25
24
25
27
28
5