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.
2214 Series
Day/Night Pneumatic Room Thermostats
General Instructions
Full Dial Cover Shown
(Covers must be ordered
separa t el y ex c ep t as no ted . )
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 setpoi nt.
Maximum Air Pressure: 30psig.
Main Air Consumption: 30 scim at 16 psig; 43 scim at
25 psig.
Calibr a ti o n P o int: 9 psig branch line pressure when
ambient equals set point (factory-set).
Day/Night Indexing: Remot e, by change in main air
pressure.
Setpoint Adjustment: Ser rated thumbwheel.
Construction:
Mechanical Components, Di e cast al umin um, stai nless
steel, and glass-filled nylon.
Diaphragm, Fabric-reinforced Neoprene .
Air Lines, Connect to ther m ostat nipples with
spring-reinforced plastic tubes.
Branch Connections, Equipped with internal fiters.
Printed in U.S.A. 8/08 © Copyright 2008 TAC All Rights Reserved. F-24577-3
Environment
Humidity: 5 to 95% relative humidity, non-condensing.
Locations: NEMA Type 1.
ORDERING DATA
Table-1 Model Chart — Thermostats.
Wholesale
Number
2214-121 T23-301
2214-131
2214-122 T24-301
2214-132
a
These models include factory-installed 20-712 dial stop kits.
Replaces
a
T23-3011
a
T24-132
Model
Day/Night
Action
Direct/
Direct
Reverse/
Reverse
Includes (2) 1/4"x 3/16"
tubing reducer s, 20-693
tubing, 20-714 wall plate,
20-711 mounting plate, and
mounting screws.
Description
Table-2 Model Chart — TAC Uni-Kits®.
Wholesale
Number
2214-521
2214-522
2214-621 T23-301
2214-622 T24-301
a
These models include factory-installed 20-712 dial stop kits.
Replaces
a
T23-3011
a
T24-3011
Model
Action Description
Includes thermostat with
Direct/
Direct
stops, 21-933 full dial cover
with bl ank cover conversion,
and 22-022 conversion ki t.
Includes thermostat, 22-1033
Reverse/
Reverse
full dial cover with blank cover
conversion, and 22-023
conversion kit.
Table-3 Covers.
Wholesale
Number
Replaces
Model
21-923 C1-42
22-923 C1-46
Color Material
Satin Chrome
Metal
Dial
Markings
55 to 85 °F
Plastic22-823 C1-47 Beige
22-1023 C1-48 Euro-white 10 to 30 °C
a
21-928
a
22-928
a
a
22-1028
21-933 C3-42
22-933 C3-46
C2-42
C2-46
Satin Chrome
C2-47 Beige
C2-48 Euro-white
Satin Chrome
Metal
Plastic22-828
Metal
Blank Concealed
55 to 85 °F
Plastic22-833 C3-47 Beige
22-1033 C3-48 Euro-white 10 to 30 °C
a
21-939
a
22-939
a
a
22-1039
21-943 C5-42
22-943 C5-46
C4-42
C4-46
Satin Chrome
C4-47 Beige
Metal
55 to 85 °F
Plastic22-839
C4-48 Euro-white 10 to 30 °C
Satin Chrome
Metal
Plastic22-843 C5-47 Beige
22-1043 C5-48 Euro-white
21-948 C6-42
22-948 C6-46
Satin Chrome
Metal
Cooler - Warmer Yes No
Plastic22-848 C6-47 Beige
22-1048 C6-48 Euro-white
a
21-957
a
22-957
a
a
22-1057
a
21-960
a
22-960
a
a
22-1060
2890-010
2890-011
2890-013
a
a
a
a
a
Thermostat covers with concealed setpoint adjustment, and thermostat cover kits inlude setpoint adjustment cover 21-800 (black) or 21-801 (Euro-white).
C11-42
C11-46
Satin Chrome
C11-47 Beige
Metal
Plastic22-857
None Concealed
C11-48 Euro-white
C14-42
C14-46
Satin Chrome
C14-47 Beige
Metal
Plastic22-860
Blank Concealed
C14-48 Euro-white
Kit
Kit
Satin Chrome
Kit Beige
Metal
55 to 85 °F
or Blank
Plastic2890-012
Kit Euro-white 10 to 30 °C or Blank
Setpoint
Adjustment
Yes
Yes
Concealed
Yes
or
Concealed
Thermometer
(External)
(External)
(Internal)
No
Yes
Yes
Yes
No
2 © Copyright 2008 TAC All Rights Reserved. F-24577-3
Table-4 Accessories.
Wholesale
Number
20-676 10-18 Aspirating box, stainless steel
20-695 10-15 Aspirating box, satin finish
20-707 10-53 Metal thermostat guard
20-712 10-59 Internal stop kit
20-715 10-62 Clear c over thermostat guard
20-850 — Thermostat mounting plate
20-881 N2-4 Thermo stat cali bra t io n wren c h
21-473 10-73 Drywa ll mounting bracket
21-800 10-72 Setpoint adju stment cover (black)
21-801 10-81-48 Setpoint adjustment c over (Euro-white)
21-876 10-76 Opaque cover ther mostat guard
22-022 — Thermostat conversion kit
22-023 — Thermostat conversion kit
22-138 MCS-GA Branch tap gauge adaptor
900-002 — Thermostat calibration kit
Replaces
Model
Description
TYPICAL APPLICATIONS
(Piping Diagram)
Location
Caution:
• Do not locate the thermostat near sources of heat or
cold, such as lamps, motors, sunlight, or concealed
ducts or pipes. Doing so wi ll affect the accuracy of the
thermostat.
• Avoid install ing the th ermostat on ou tside wall s. If su ch a
location is necessary, mount the thermostat on an
insulated back plate (accessory it em ).
• Mount thermostats
been finished.
Locate the thermostat where it will be exposed to an
unrestricted circulation of air, which represents the average
temperature of the controlled space.
only after the wall surfaces have
Mounting
Standard M ounting Optio ns
1. Mount the thermostat according to the applicable f igure
(Figure-2 throug h Figure-8). See Fig ure-10 for mounting
dimensions.
2214 Series
Thermostat
M B
Controlled
Device
M
16 psig Day
25 psig Night
Main Air
Figure-1 Typical Application.
INSTALLATION
Inspection
Inspect the package for damage. If damaged, notify the
appropriate carrier immediately. If undamaged, open the
package and inspect th e device for obvious damage. Return
damaged products.
Requirements
• Tools (not provided):
– Appropriate sc rewdriver for mounting the thermosta t
– 20-881 Thermostat cal ibration and cover sc rew
wrench (or 1/16” and 1/4” hex wrenches)
• Training: Installer must be a qualifi ed, experienced
technician
• Appropriate accessories
• Piping diagrams
1/4 x 3/16 in. Barbed Coupling
(included with thermostat)
6 in. Tube Assembly
(order separately)
21-611
for Plastic Tubing
20-693
with Eyelets
(included with
thermostat)
¡
F
¡
1
C
2
6
5
2
2
Cover
Mounting Screws
(included with thermostat)
Figure-2 Flush Mount ing of Thermostat,
Using Drywall Mounting Bracket.
20-714
Wall Plate
(included with
thermostat)
Thermostat
Polyethylene
Tubing Air Supply
Branch
Main
21-473
Drywall Mounting
(order separately)
F-24577-3 © Copyright 2008 TAC All Rights Reserved. 3
6 in. Tube Assembly with Eyelets
20-693
(included with thermostat)
Pre-plumbed
Electrical Box
Polyeth ylene Tubing
Air Supply
Branch
Main
6 in. Tube Assembly with Eyelets
20-693
(included with thermostat)
Thermostat
Polyeth ylene Tubing
Air Supply
Branch
Bracket
Main
Thermostat
¡
F
¡
1
C
2
6
5
2
2
Wall
20-850 Plate
(2) Screws for Electrical
Box Mounting
Cover
(order separately)
(2) #6 Self-Tapping
Screws
Figure-3 Flush Moun ti ng of Thermostat, Using 20- 850 Plate
and Pre-Plumbed Electri cal Box.
Polyeth ylene Tubing
Air Supply
Main
6 in. Tube Assembly with Eyelets
20-693
(included with thermostat)
Branch
Bracket
¡
F
¡
1
C
2
6
5
2
2
Cover
(order separately)
Figure-5 Thermost at Mounted with 22-022
Conversion Kit, Usi ng Wa ll Plate Only, to
Replace Competitive Thermostats.
Wall Plate
3/16 in. Tygothane
Tubing with Eyelets
(included with thermostat)
Thermostat
1
Wall Plate
Mounting Screws
(included with thermostat)
Pre-plumbed
Electrical Box
Air Supply Tubing
Branch
(optional)
2
Wall
Main
Thermostat
¡
F
¡
1
C
2
6
5
2
2
Wall Plate
Mounting Screws
Cover
(order separately)
(included with thermostat)
Figure-4 Thermost at Mounted with 22-022
Conversion Kit, Using Wall Plate and Skirt, to
Replace Competitive Thermostats.
4 © Copyright 2008 TAC All Rights Reserved. F-24577-3
Skirt
¡
F
¡
1
C
2
6
5
2
2
3/16 in. x 1/4 in.
Barbed Coupling
(included with thermostat)
2
Insert
(2) #6 x 1 in.
2 4
Mounting Screws
Cover
1
(2) Thermostat
(for electrical box mounting)
Mounting Screws
(included with thermostat)
3
1 The pneumatic thermostat replacement kits 2214-621 and
2214-622 include a thermostat, a 22-1033 Euro-white cover,
and a 22-023 thermostat conversion kit.
2 Provided in the 22-023 thermostat conversion kit.
3 Optionally, the thermostat may be mounted with the #6 x 1 in.
self-tapping screws provided in the 22-023 kit.
4 Use the #8 x 1 in. mounting screws provided in the 22-023 kit
when mounting the wall plate directly to the wall, without an
electrical box.
Figure-6 Thermosta t Mounted with 22-023 Thermostat
Conversion Kit.
Remove Locator
and Adaptor
20-714
Wall Plate
(included with
thermostat)
Thermostat
¡F
¡
1
C
2
6
5
2
2
Cover
(order separately)
Figure-7 Thermostat Ins tal lation Using
Pipehead in Masonry Wall .
20-716
Insulating Back Plate
(order separately)
20-693
6 in. Tube Assembly
with Eyelets
(included with
thermostat)
Block
Branch
20-710
Mortar Joint Fitting
(order separately)
20-693
6 in. Tube Assembly with Eyelets
(included with thermostat)
Mounting Screws
(included with thermostat)
20-689
Mounting Fitting with
8 ft. Copper Lines
(order separately)
Branch
Cutouts
(partially formed
on underside)
Polyethylene
Tubing
Air Supply
Main
Polyethylene
Tubing
Air Supply
Main
CALIBRATION
The 2214 series thermostats are factory calibrated with day
sensor throttling range set at 3 °F. They should not require
calibration upon installation. However, if it is necessary,
change the throt tling range, calibr ation, or switch po int setting
as follows:
1. Remove the thermostat cover and install a 22-138 branch
tap gauge adaptor into the branch pressure tap hole
(Figure-9).
2. Measure the ambient temperatur e wit h an accurate
thermometer. This tempera ture
of the thermost at
. Take care not to breathe on, or place
a hand near the bimetals, as this will result in an
inaccurate r eading.
Setpoint Adjustment
Limit Stops (2)
(Accessory)
Day Setpoint
Day Bimetals
Fahrenheit
Scale
Night Bimetal
Night Calibration and
Setpoint Screw
Setpont Indicator
˚F ˚C
12
6
2
Night Setpoint Dial
Figure-9 Thermostat Calibration Features
and Limit Stop Acces sory.
must be withi n the range
Cover Scale
T R
H
5
2
Branch
Pressure
Tap
Celsius
Scale
Day Calibration
Screw
Day Throttling
Range
Adjustment
Switching
Screw
¡
F
¡
1
C
2
6
5
2
2
20-642
Mounting Ring and
Flathead Screws
(order separately)
Thermostat
Mounting Screws
Cover
(included with thermostat)
(order separately)
Figure-8 Surface Mounting of Thermostat,
Pipehead Application.
Optional Mounting
Eliminate the pipe head fitting by usi ng the 22-022 therm ostat
conversion ki t and the included instr uctions, plus the
following:
1/4" Plastic Air Lines: Inst all th e 1/4" barbed c ouplings i nto
the air lines. Connect the tube assembly to the 3/16" end of
these couplings.
1/4" Copper Air Lines: Solder the bar bed couplings into the
copper lines. The tube assembly can then be connected to
the 3/16" end of the couplings.
Day Setpoint Calibration
1. Position the day setpoint cam (Figure-9) to match the
ambi ent temperat ure.
2. Set the main air pressure to 15 psig and adjust the day
calibrating screw using a 20-881 thermos tat wrench
(1/16” hex wrench) until the branch tap gauge reads
9 ± 1 psig. Clockwise rotation increases the branch line
pressure. Count erclockwise rotation lowers the branch
line pressure.
Night Setpoint Calibration
1. Incre ase the main line p ressure to 25psig.
2. Using a 20-881 ther mostat wr ench ( 1/16” h ex wrench) in
the night setpoint screw (Figure-9), position the night
setpoint dia l t o match the ambient temperature.
3. Firmly hold the night setpoint dial with your fingers and
adjust the night calibrating screw until the branch tap
gauge reads 9 ± 1 psig.
4. Release the dial and allow it to rotate with the night
calibrating screw to the desired night control point.
F-24577-3 © Copyright 2008 TAC All Rights Reserved. 5
Switching Adjustment
Internal Stop Kit (Accessory)
The 2214 series thermostats are factory calibrated to switch
from day to night action at a pressure between 17 and
21 psig. If necessary, adjust the switch point as follows:
Note:
• The switch point adjustment should be made on a test
bench at which a variable main air supply is available.
• It is necessary to re ad the branch line pressur e whil e
making the switch point adjustment.
1. Set the main air supply to the thermostat to the desired
switch over point. For example, if system pressure is
13 psig day and 18 psig night, the desired switch over
point would be between 15 and 16 psig.
2. Position the day and night setpoints according to
Table-5.
Table-5 Day and Night Setpoints.
Thermo stat Model Day Night
2214-121, 2214-131, 2214-521, 2214-621 55 °F 80 °F
2214-122, 2214-132, 2214-522, 2214-622 85 °F 50 °F
3. Verify that the branch line pressure gauge or branch
pressure tap reads approxim ately the main air pressure
being fed to the thermostat. If not, recheck the day
setpoint calibration.
4. To lower the switch over point, use a 20-881 thermostat
wrench (1/16” hex wrench) to turn the switching screw
clockwise, 1/8 tu rn at a time, until the branch line
pressure fal ls. To raise the switch over point, turn the
switching scr ew counterclockwise in the same manner.
Caution:
action is n ot obtained when the screws are rotated, check to
be sure the direct ion of rotation is correct.
5. Lower the main air pressure to the desired system day
6. Raise the main air pressure to the night setting and
7. Reinstall the thermostat cover and recheck the
Do not force the calibrating screws. If the desired
pressure and observe the branch line pressure. The
branch line pre ssure should rise to appr oximately the
main air pressur e.
observe the ther m ostat for proper fu nction. As the main
air pressur e ri ses past the swi tch over point, t he branch
line pressur e should dr op off to zero. Lower the main air
pressure and verify that the branch line pressure rises
from zero as the main ai r pressure drops below the
switch over poi nt.
calibration at both day and night settings.
The internal stop kit, model 20-712, consists of two screws
and two nuts (Figure-9). Install this kit as follows:
1. Move the setpoint adjust m ent to one extreme limit.
2. Place a nut in the depression in the top plate and move
the adjustment cam o ver the nut, t o where t he slo t in t he
cam exposes the threads of the nut.
3. Thread a stop screw into the nut far enough to allow the
stop to slide in the slot. Repeat on the other side.
4. Move the setpoint adjustment to the desired
temperature, using the internal setpoint indicator.
5. Slide the stops to the desired limi ts and tighten both
screws.
MAINTENANCE
The thermostat requires no maintenance.
Regular mainten ance of the t otal sys tem is reco mmended to
assure sustained, optimum performance.
FIELD REPAIR
None. Replace an inoperative thermostat with a functional
unit.
DIMENSIONAL DATA
1/8
(.318)
2-1/32
(5.16)
1-1/4
(3.18)
1-3/8
(3.5)
Dimensions are in inches (mm).
Figure-10 Mounting Dimensions.
MB
1-3/8
(3.5)
2-1/32
(5.16)
6 © Copyright 2008 TAC All Rights Reserved. F-24577-3
F-24577-3 © Copyright 2008 TAC All Rights Reserved. 7
Copyright 2008, TAC
All brand names, trademarks and registered
trademarks are the property of their respective
owners. Information contained within this
document is subject to change without notice.
F-24577-3
TAC
1354 Clifford Avenue
P.O. Box 2940
Loves Park, IL 61132-2940
www.tac.com
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