TAC Pneumatic Products Catalog

T34-3011 (2218-301, 2218-534 Kit)
Energy Conservation Summer-Winter Room Thermostat
This pneumatic room thermostat is designed for
proportional control of pneumatic valves and
damper actuators in environmental control
systems where a dual pressure air main is utilized
for seasonal changeover of heating and cooling
functions. Its design incorporates a highly
sensitive, bimetal, thermostatic element and a pilot
operated relay with pneumatic feedback for
accuracy and stability over the entire operating
range.
Features:
• Small size: Approximately 2 x 2 in. (51 x 51 mm).
• 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.
• Separate bimetals (and setpoint scales) for heating and
cooling.
• Limited setpoint ranges for energy conservation: 44 to 74�F
(7 to 23�C) for winter (heating) and 76 to 85�F
(24.5 to 29.5�C) for summer (cooling).
• Snap-acting (not gradual) changeover from direct action to
reverse action, and vice versa.
Model Chart
Model No.
T34-3011 a
Wholesale Model
No.
2218-301 b
�� 2218-534 c
Parts Description
� Refer to Specifications.
a All thermostats include: Two mounting screws.
b
All Wholesale thermostats include: One or two 1/4 x 3/16 i n. tubing reducer(s), 20-693 tubing, 20-714 wall plate, 20-711 mounting plate, and two mounting
screws.
c For details refer to Table , “T-Series Thermostat Kits,” on page 122.
2218-301 Thermostat
21-933 Full dial cover with blank cover conversion
22-022 Conversion kit
Cover Options
Thermostat covers are available separately in various styles to meet particular requirements. Cover options include models with
setpoint scale and thermometer, setpoint scale only, thermometer only or blank (suggest using blank cover). An external
setpoint adjustment cover is available with all models and can be field installed on covers where required.
Covers must be ordered separately, refer to Cover Selection Table on page 25.
F-27383-1 © Copyright 2006 TAC. All Rights Reserved. 125
T34-30
(2218-
1,
2218-5
Kit)