User Guide

ManualsBrandsBarber Colman ManualsHVAC Replacement PartsDead Band Reverse Acting Thermostat

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 devices are

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.

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.

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 each

setpoint.

Maximum Air Pressure: 30 psig.

Main Air Consumption: 30 scim.

Setpoint Adjustment: Individual concealed adjustments for

heating and cooling by means of a 20-881 calibration 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 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.

2212-318

2212-319

Dual Setpoint/Deadband

Pneumatic Room Thermostats

General Instructions

Blank Cover Shown

(Covers must be ordered

separately except as noted.)

Summary of content (8 pages)

PAGE 1
2212-318 2212-319 Dual Setpoint/Deadband Pneumatic Room Thermostats General Instructions 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.
PAGE 2
ORDERING DATA Table-2 Model Chart — Thermostat Replacement Kits. Table-1 Model Chart — Thermostats. Wholesale Number Replaces Model 2212-318 T35-301 2212-319 T36-301 a Action Description Includes (2) 1/4" x 3/16" Direct barbed couplings, 6" piece of polyethylene tubing, 20-714 Reverse wall plate, 20-711 mounting plate, and mounting screws.
PAGE 3
Requirements Polyethylene Tubing Air Supply • Tools (not provided): – Appropriate screwdriver for mounting the thermostat – 20-881 Thermostat calibration and cover screw wrench (or 1/16” and 1/4” hex wrenches) Pre-plumbed Electrical Box Branch Main 20-693 6 in.
PAGE 4
20-693 6 in. Tube Assembly with Eyelets (included with thermostat) Polyethylene Tubing Air Supply Branch Main Bracket Remove Locator and Adaptor Polyethylene Tubing Air Supply Branch Block Main 20-714 Wall Plate (included with thermostat) Thermostat Thermostat 20-710 Mortar Joint Fitting (order separately) Wall Plate 20-693 6 in.
PAGE 5
OPERATION Heating Thermostat Output Pressure Increase The deadband output (branch) pressure is factory set at 8 psig (55.2 kPa), placing both heating and cooling actuators in the “off” (or closed) position. The output remains at that pressure while the ambient (room) temperature varies within the deadband. When the ambient temperature closely approaches either the heating or cooling setpoint at either end of the deadband, the output pressure changes at the rate of approximately 3.3 psi/°F (41 kPa/°C).
PAGE 6
Calibrating Screw "B" Calibrating Screw "B" 74 78 74 O L I N G 0 72 7 68 IN G 68 66 Cooling Dial CO 76 74 I N G 76 Cooling Dial Cooling Setpoint and Stop Heating Setpoint and Stop L C 70 O O 72 HEAT 72 70 Heating Dial Calibrating Screw "C" 68 Calibrating Screw "C" Calibrating Screw "A" Cooling Setpoint and Stop Direct-Acting Heating Bimetal 78 66 HE 68 Heating Setpoint and Stop Reverse-Acting Cooling Bimetal Dead-Band Lever Sensor Ball Heating Dial A G T 70 I N 72 Calibrating Sc
PAGE 7
MAINTENANCE The thermostat requires no maintenance. Regular maintenance of the total system is recommended to assure sustained, optimum performance. FIELD REPAIR None. Replace an inoperative thermostat with a functional unit. DIMENSIONAL DATA 1/8 (.318) M B 2-1/32 (5.16) 1-1/4 (3.18) 1-3/8 (3.5) 2-1/32 (5.16) 1-3/8 (3.5) Dimensions are in inches (mm). Figure-12 Mounting Dimensions. F-24576-4 © Copyright 2008 TAC All Rights Reserved.
PAGE 8
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-24576-4 TAC 1354 Clifford Avenue P.O. Box 2940 Loves Park, IL 61132-2940 www.tac.