Specifications

DRI-STEEM
®
STS
®
steam-to-steam humidifier schedule and features
Rev. 02/11 Page 2 of 5
STS with DI/RO water option
The following is a description of the STS humidifier with the DI/RO water option proposed for use on the subject
project.
Steam pressure is reduced to 15 PSI.
Tag Quantity Model Capacity Dispersion method Duct dimensions (w x h)
AHU one STS-100S 109 lb/hr Ultra-Sorb 22” x 12”
The above STS humidifier with the DI/RO water option is furnished with:
1. Evaporating chamber constructed of 14-gauge, type 304 stainless steel
2. Internal heat exchanger with supply and return headers
3. A(n) __pneumatic_________ 120V primary/24V secondary (to control flow of steam into heat exchanger)
4. Steam trap (¾” F&T trap for STS-25/50/100; 1¼” F&T trap for STS-200/400/800)
5. Wye strainer
6. Float fill valve
7. Vapor-logic
®
4 microprocessor-based control system with USB port for firmware updates and data backup and
restore, and control using a Vapor-logic4 keypad and/or a Web interface. System maintains and monitors
water level via a conductivity probe system.
_____ Wall transmitter _____Duct transmitter
__XX___ Control signal by others:
_____0-10 VDC _____4-20 mA
_____ Modulating high limit control; includes a duct mounted ±2% RH humidity transmitter
(0% - 100% RH range)
_____ Auxiliary temperature sensor/transmitter for temperature compensation control to prevent window
condensation, or air temperature monitoring
_____ Airflow proving switch:
_____RH-3 pressure _____Sail
_____ Duct high limit humidistat (30 - 90% RH)
Interoperability with building automation system:
_____Modbus
®
(standard) _____BACnet
®
(optional) _____LonTalk
®
(optional)