T.a.c 2212-319, 2212-318 User Manual
Application
The 2212-318 and 2212-319 Dual Setpoint/Deadband
Pneumatic Room Thermostats are designed for the
proportional control of pneumatic valves, damper
actuators, or other final control devices in
environmental control systems. These device s ar e
used when it is desirable to set up, between selected
heating and cooling setpoints, a temperature span
within which the HVAC system uses no energy for
heating or cooling. The high capacity, two-pipe,
pilot-operated, relay-type design provides pneumatic
feedback for accuracy and stability over the entire
operating range.
2212-318
2212-319
Dual Setpoint/Dead ban d
Pneumatic Room Thermostats
General Instructions
These thermostats are available in either direct- or
reverse-acting models, each utilizing two bimetals, one
heating and one cooling, to interrupt the deadband
(branch) pressure. In the direct-acting model, the
heating bimetal modulates the pressure between zero
and the deadband pressure, and the cooling bimetal
modulates the branch pressure between the deadband
pressure and main air pressure. In the reverse-acting
model, this action is reversed. The deadband pressure
is adjustable in the field, to adapt to specific
applications. Two concealed setpoint dials, one
heating and one cooling, are used to set the individual
heating and cooling setpoints to the desired values.
This creates the desired deadband between the two
selected setpoints. All calibration functions are
accessible from the front of the thermostat. The use of
a blank cover (21-928) is recommended with this
device. Other cover options may be utilized if desired.
Features
• Factory-calibrated, stainless steel ball-in-seat
provides pneumatic feedback for stable, linear
operation.
• Deadband is easily selected by setting the desired
heating and cooling setpoints.
• Field-adjustable deadband output pressure is
factory set at 8 psig.
• Leak-proof, self-closing branch gauge tap.
Blank C over Shown
(Covers must be ordered
separa t el y ex c ep t as no ted . )
SPECIFICATIONS
Action: Proportional.
Setpoint Range:
Heating, 57 to 75 °F (14 to 24 °C).
Cooling, 65 to 83 °F (18 to 28 °C).
Throttling Range: 1.5 °F (approx.) non-adjustable for eac h
setpoint.
Maximum Air Pressure: 30 psig.
Main Air Consumption: 30 scim.
Setpoint Adjustment: In dividual conceal ed adjustments fo r
heating and cool ing by means of a 20- 881 calibrati on wrench.
Calibration:
Deadband, Factory-set at 8 psig (adjustable).
Direct-Acting Models ,
Heating 5.5 psig at setpoint.
Cooling 10.5 psig at setpoint.
Reverse-Acting Models,
Cooling 5.5 psig at setpoint.
Heating 10.5 psig at setpoint .
Construction:
Mechanical Components, Die cast aluminum, stainless
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.
Environment
Humidity: 5 to 95% relative humidity, non-condensin g.
Locations: NEMA Type 1.
Printed in U.S.A. 8/08 © Copyright 2008 TAC All Rights Reserved. F-24576-4
ORDERING DATA
Table-1 Model Chart — Thermostats.
Wholesale
Number
2212-318 T35-301 Direct
2212-319 T36-301 Reverse
a
Other rough-in hardware and installation fittings must be ordered
separately.
Replaces
Model
Action Description
Includes (2) 1/4" x 3/16"
barbed couplings, 6" piece of
polyethylene tubing, 20-714
wall plate, 20-711 mounting
plate, an d mounting scr e ws .
a
Table-2 Model Chart — Thermostat Replacement Kits.
Wholesale
Number
2212-538 T35-301 Direct
2212-539 T36-301 Reverse
Replaces
Model
Action Description
Table-3 Covers.
Wholesale
Number
21-928 C2-42 Satin Chrome Metal
22-1028 C2-48 Euro-white Plastic
21-957 C11-42 Satin Chrome Metal
22-1057 C11-48 Euro-white Plastic
21-960 C14-42 Satin Chrome Metal
22-1060 C14-48 Euro-white Plastic
a
Thermostat covers with concealed setpoint adjustment inlude setpoint adjustment cover 21-800 (black) or 21-801 (Euro-white).
Replaces
a
Model
Color Material
Dial
Markings
Blank Concealed No
None Concealed
Blank Concealed
Setpoint
Adjustment
Includes thermostat, 21-928
blank cover, and 22-022
conversion kit
Thermometer
Yes
(External)
Yes
(Internal)
Table-4 Accessories.
Wholesale
Number
20-695 10-15 Aspirating box
20-707 10-53 Metal thermostat guard
20-710 10-57 Universal mounting fitting
20-712 10-59 Dial stop kit
20-714 10-77 Black wall plate
20-715 10-62 Clear thermostat guard
20-716 10-78 Insulated back plate
20-850 — Thermostat mounting plat e
20-881 N2-4 Calibration wrench
21-473 10-73 Drywall mounting bracket
21-800 10-72 Setpoint a djustment cover (black)
21-801 10-81-48 Setpoint adjustment cover (Euro-white)
21-876 10-76 Opaque thermostat guard
22-022 — Thermostat conversion kit
22-023 — Thermostat conversion kit
22-138 MCS-G A Branch ta p ga ug e ad aptor
900-002 — Thermostat calibration kit
Replaces
Model
Description
TYPICAL APPLICATIONS
(Piping Diagram)
2212 Series
Dead-Band Thermostat
BM
M
HC
HWS CWS
N.O. Heating Valve
3 to 8 psig
Figure-1 Direct-Acting Application.
INSTALLATION
Inspection
N.C. Cooling Valve
8 to 13 psig
Inspect the package for damage. If damaged, notify the
appropriate carrier immediately. If undamaged, open the
package and inspect the device for obv ious damage. Ret urn
damaged products.
2 © Copyright 2008 TAC All Rights Reserved. F-24576-4
Requirements
• Tools (not provided):
– Appropriate screwdriver for mounting the thermostat
– 20-881 Thermostat cal ibration and cover screw
wrench (or 1/16” and 1/4” hex wrenches)
• Training: Installer must be a qualified, experienced
technician
• Appropriate accessories
• Piping diagrams
6 in. Tube Assembly with Eyelets
20-693
(included with thermostat)
Pre-plumbed
Electrical Box
Polyeth ylene Tubing
Air Supply
Branch
Main
Location
Caution:
• Do not locat e the the rmostat nea r sources of heat or cold,
such as lamps, motors, sunlight, or conceal ed ducts or
pipes. Doing so wil l affect the acc uracy of the t hermostat.
• Avoid install ing th e thermost at on out si de wall s. If such a
location is necessary, mount the thermostat on an
insulated back plate (accessory item).
• 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
Mount the thermostat according to the applicable figure
(Figure-2 through Figure-8). See Figure -12 for mounting
dimensions.
1/4 x 3/16 in. Barbed Couplings
21-611
for Plastic Tubing
(included with thermostat)
20-693
6 in. Tube Assembly
with Eyelets
(included with
thermostat)
20-714
Wall Plate
(included with
thermostat)
Polyethylene
Tubing Air Supply
Branch
Main
Thermostat
Wall
20-850 Plate
(2) Screws for Electrical
Box Mounting
(2) #6 Self-Tapping
Cover
(order separately)
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)
Thermostat
Branch
Bracket
Skirt
Thermostat
21-473
Drywall Mounting
(order separately)
Cover
(order separately)
Wall Plate
Mounting Screws
(included with thermostat)
Figure-4 Thermost at Mounted with 22-022
Conversion Kit, Using Wall Plate and Skirt, to
Replace Competitive Thermostats.
Cover
(order separately)
Mounting Screws
(included with thermostat)
Figure-2 Flush Mount ing of Thermostat.
F-24576-4 © Copyright 2008 TAC All Rights Reserved. 3
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