439 | SIEMENS - BUILDING TECHNOLOGIES diversitech.com | 800.995.2222 ©2022 DiversiTech Corporation. All Rights Reserved PNEUMATIC SYSTEMS Features • Liquid filled sensing element • Direct acting (DA), reverse acting (RA), and heating-cooling models (HC) • Mounting bracket provided The HU 186 Room and Duct Hygrostats are pneumatic instruments sensitive to slight changes in relative humidity. They feature adjustable sensitivity and bimetal temperature compensation to minimize temperature effects. The room hygrostat comes complete with standard cover and wall plate. The duct hygrostat is shipped inside the duct mounting box. The TH 188 Unit Mounted Thermostat is a remote bulb, gradual acting pneumatic instrument that maintains a pre-selected temperature by positioning pneumatic devices that control a heating or cooling medium. Item ID Description 188-0030 Thermostat, Pneumatic, Unit Mounted, DA/RA, Heat/Cool, Liquid Filled Bulb 188-0031 Thermostat, Pneumatic, Unit Mounted, DA, Liquid Filled Bulb 188-0033 Thermostat, Pneumatic, Unit Mounted, DA/RA, Heat/Cool, Liquid Filled Bulb 188-0034 Thermostat, Pneumatic, Unit Mounted, DA/RA, Heat/Cool, Liquid Filled Bulb Item ID Description 186-0013 Hygrostat, Room, Pneumatic, DA, 20% to 90% RH, with Cover and Wall Plate 186-0019 Hygrostat, Room, Pneumatic, RA, 20% to 90% RH, with Cover and Wall Plate HU 186 Room Hygrostats TH 188 Unit Mounted Thermostats Features • Maximum Dry Bulb Temp. - 135°F • Control Range (rh) - 20 to 90% Application The TH 188 thermostat is mounted in fan coil units and unit ventilators to control a space temperature in applications where a wall thermostat cannot be used.
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