T.a.c. 2214 Series General Instructions Manual
Printed in U.S.A.
8/08
©
Copyright 2008 TAC All Rights Reserved.
F-24577-3
Application
The 2214 Series Pneumatic Room Thermostats are
designed for applications requiring separate control
points due to varying occupancy or seasonal loads.
They are particularly well suited to day/night control in
buildings such as schools and hospitals.
These thermostats have a serrated thumb wheel for
setpoint adjustment. They utilize dual bimetals and are
available in both direct and reverse acting models. One
temperature (day) is controlled when the main
pressure is 15 to 17 psig, and the other temperature
(night) is controlled when the main pressure is 21 to
25 psig. Both control points are adjustable and either
may be set to control higher or lower than the other,
using a ball feedback system and a 2:1 relay.
Thermostat covers are available in various styles to
meet particular requirements. Cover options include
models with a setpoint scale and a thermometer, a
setpoint scale only, a thermometer only, or blank. An
external setpoint adjustment cover is available on
some models, or can be field-installed on covers where
desired.
Features
•
Factory-calibrated, stainless steel ball-in-seat
provides pneumatic feedback for stable, linear
operation.
•
Separate factory-calibrated night bimetal and
setpoint dial, with fixed 4 °F night throttling range for
accurate “night” operation.
•
Snap-acting (not gradual) changeover from “day” to
“night” operation and vice versa.
•
Easy-to-use throttling range adjustment and
recalibration.
•
Adjustable (patented) bimetal shows actual
throttling range in both °F and °C. Adjustable 2 to
12 °F (1 to 6.7 °C).
•
Leak-proof, self-closing branch gauge tap.
SPECIFICATIONS
Action: Proportional.
Setpoint Range:
Day, 55 to 85 °F (13 to 29 °C)
Night, 50 to 80 °F (10 to 27 °C).
Throttling Range:
Day, Adjustable 2 to 12 °F
Night, Adjustable 3 to 5 °F.
Supply Air Pressure:
Below 17 psig, Operates at day setpoint.
Above 21 psig, Operates at night setpoint.
Maximum Air Pressure: 30 psig.
Main Air Consumption: 30 scim at 16 psig; 43 scim at
25 psig.
Calibration Point: 9 psig branch line pressure when
ambient equals setpoint (factory-set).
Day/Night Indexing: Remote, by change in main air
pressure.
Setpoint Adjustment: Serrated thumbwheel.
Construction:
Mechanical Components, Die cast aluminum, stainless
steel, and glass-filled nylon.
Diaphragm, Fabric-reinforced Neoprene.
Air Lines, Connect to thermostat nipples with
spring-reinforced plastic tubes.
Branch Connections, Equipped with internal fiters.
Environment
Humidity: 5 to 95% relative humidity, non-condensing.
Locations: NEMA Type 1.
2214 Series
Day/Night Pneumatic Room Thermostats
General Instructions
Full Dial Cover Shown
(Covers must be ordered
separately except as noted.)