Brochure

H18-301 (2230-018)
32
© Copyright 2006 TAC. All Rights Reserved. F-27383-1
Room Humidistat
Model Chart
Specifications
The pneumatic room humidistat is a
proportioning-type device designed to control
pneumatic valves or damper actuators associated
with heating or cooling coils, humidifiers, air
washers, or other humidifying or dehumidifying
equipment to maintain constant relative humidity.
This device uses a highly sensitive hygroscopic
nylon ribbon and a pilot bleed relay with pneumatic
feedback. Throttling range, action (direct or
reverse), and setpoint are easily adjusted by
graduated dials. Internal limit stops are available to
restrict adjustment range when required.
Features:
Attractive appearance (various metal or ABS plastic covers
available).
Factory calibrated. S.S. ball-in-seat provides pneumatic
feedback for linear, stable operation.
Leakproof, O-Ring-sealed, spring-loaded self-closing
branch gauge tap.
Easy manual changeover from reverse to direct action, and
vice versa.
Model No. Wholesale Model No. Description
H18-301 2230-018
a
a
Includes cover, (2) 1/4” x 3/16” reducers, 6” piece of plastic tubing, mounting plate, and wall plate.
Refer to Specifications.
Action Proportional: factory set for reverse action, adjustable for direct action.
Setpoint range 20 to 90% RH.
Throttling range 5 to 15%/12 psi adjustable, factory set 10%.
Construction
Element Hygroscopic nylon.
Components Die cast aluminum, stainless steel, and glass-filled nylon.
Diaphragms Fabric-reinforced neoprene.
Air filter Internal.
Maximum ambient temperature 140qF (60qC).
Supply air pressure Clean, dry, oil free air required (Refer to EN-123).
Nominal 20 psig (138 kPa).
Minimum 16 psig (110 kPa).
Maximum 30 psig (207 kPa).
Connections For spring-reinforced 3/16 in. plastic tubing and required fittings (order separately).
Calibration point 9 psig branch line pressure when ambient humidity equals setpoint.
Setpoint adjustment Serrated thumb wheel. May be concealed with 10-72 adjustment cover (order separately).
Cover Included with Humidistat.
Scale 20 to 90%.
Finish Satin chrome painted aluminum.
Air consumption 17 scim (4.6 mL/s); 19 scim (RA) (5.2 mL/s).
H18-301
(2230-01
8)
50
20
90