TAC 2218 User Guide

Page 1

TAC

1354 Clifford Avenue P. O. Box 2940 Loves Park, IL 61132-2940 www.tac.com

Application

The 2218 Series Pneumatic Room Thermostats are designed for proportional control of pneumatic valves and damper actuators in environmental control systems where a dual presure air main is utilized for seasonal changeover of heating and cooling functions. Their 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.

Indexing the thermostat from summer control (reverse acting) to winter control (direct acting), or vice versa, is accomplished by remotely changing the main air pressure supply from 16 psig (summer) to 25 psig (winter). Models are also available that operate on slightly different pressures to replace many competitive devices.

2218 Series

Summer-Winter

Pneumatic Room Thermostats

General Instructions

Full Dial Cover Shown (Covers must be ordered separately except as noted.)

These thermostats have a serrated thumb wheel for setpoint adjustment. Models are also available with preassembled internal dial stops. 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.

• Snap-acting (not gradual) changeover from direct

action to reverse action 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: See Table-1 and Table-2. Throttling Range: See Table-1 and Table-2. Supply Air Pressure:

Below 16 psig, Operates at summer setpoint.

Above 25 psig, Operates at winter setpoint. Maximum Air Pressure: 30 psig. Main Air Consumption: See Table-1 and Table-2. Calibration Point: See Table-1 and Table-2. Summer/Winter 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.

Page 2

ORDERING DATA

Table-1 Model Chart — Thermostats.

Wholesale

Number

Replaces

Model

Action

Setpoint

Range

Calibration

Point

Throttling

Range

Air

Consumption

Description

2218-132 T32-301

2218-142

T32-3011

2218-133 T33-301

2218-134 T32-321

2218-301

T34-3011

These models include factory-installed 20-712 dial stop kits. Special energy-conservation model. Use of 21-928 blank cover with this model is suggested.

RA @ 16 psig DA @ 25 psig

DA @ 16 psig RA @ 25 psig

RA @ 13 psig DA @ 18 psig

RA @ 16 psig (summer) DA @ 25 psig (winter)

55 to 85 °F

(13 to 29 °C)

Winter = 44 to 74 °F (7 to 23 °C) Summer = 76 to 85 °F (24 to 29 °C)

12 psig branch

line pressure

9 psig branch

line pressure

Table-2 Model Chart — Uni-Kits®.

Wholesale

Number

2218-532

Replaces

Model

T32-3011

Action

Setpoint

Range

55 to 85 °F

(13 to 29 °C)

Winter = 44 to 74 °F

2218-534

T34-3011

RA @ 16 psig DA @ 25 psig

2218-632 T32-301

These models include factory-installed 20-712 dial stop kits.

Special energy-conservation model. Use of 21-928 blank cover with this model is suggested.

(7 to 23 °C) Summer = 76 to 85 °F (24 to 29 °C)

55 to 85 °F

(13 to 29 °C)

Calibration

Point

12 psig branch

line pressure

9 psig branch

line pressure

12 psig branch

line pressure

Adjustable

2 to 12 °F

(1 to 7 °C)

Fixed

4°F (2°C)

Nominal

2 °F (1 °C)

Throttling

Range

Adjustable

2 to 12 °F

(1 to 7 °C)

Fixed 4°F (2°C) Nominal 2 °F (1 °C)

Adjustable

2 to 12 °F

(1 to 7 °C)

17 scim @ 16 psig 30 scim @ 25 psig

30 scim @ 16 psig 43 scim @ 25 psig

Air

Consumption

17 scim @ 16 psig 30 scim @ 25 psig

30 scim @ 16 psig 43 scim @ 25 psig

17 scim @ 16 psig 30 scim @ 25 psig

Includes (2) 1/4" x 3/16" barbed couplings, 20-693 tubing, 20-714 wall plate, 20-711 mounting plate, and mounting screws.

Description

Includ es thermosta t with stops, 21-933 full dial cover with blank cover conversion, and 22-022 conversion kit.

Includes thermostat, 22-1033 full dial cover with blank cover conversion, and 22-023 conversion kit.

Table-3 Covers.

Wholesale

Replaces

Number

21-923 C1-42

22-923 C1-46

Model

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

21-928

22-928

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

21-939

22-939

22-1039

C4-42

C4-46

Satin Chrome

C4-47 Beige

Metal

55 to 85 °F

Plastic22-839

C4-48 Euro-white 10 to 30 °C

Setpoint

Adjustment

Yes

Concealed

Thermometer

Yes

(External)

Page 3

Table-3 Covers. (Continued)

Wholesale

Replaces

Number

21-943 C5-42

22-943 C5-46

Model

Color Material

Satin Chrome

Metal

Dial

Markings

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

21-957

22-957

22-1057

21-960

22-960

22-1060

2890-010

2890-011

2890-012

2890-013

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

C11-48 Euro-white

C14-42

C14-46

Satin Chrome

C14-47 Beige

C14-48 Euro-white

Kit

Satin Chrome

Kit Beige

Kit Euro-white

Metal

Plastic22-857

Metal

Plastic22-860

Metal

Plastic

None Concealed

Blank Concealed

55 to 85 °F

or Blank

10 to 30 °C

or Blank

Setpoint

Adjustment

Yes

Concealed

Thermometer

(External)

(Internal)

Yes

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 cover thermostat guard

20-850 — Thermostat mounting plate

20-881 N2-4 Thermostat calibration wrench

21-473 10-73 Drywall mounting bracket

21-800 10-72 Setpoint adjustment cover (black)

21-801 10-81-48 Setpoint adjustment cover (Euro-white)

21-876 10-76 Opaque cover thermostat 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)

2218 Series Thermostat

M B

Controlled Device

16 psig Summer

25 psig Winter

Main Air

Figure-1 Typical Application.

Page 4

INSTALLATION

Mounting

Inspection

Inspect the package for damage. If damaged, notify the appropriate carrier immediately. If undamaged, open the package and inspect the device for obvious damage. Return damaged products.

Requirements

• 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)

• Training: Installer must be a qualified, experienced

technician

• Appropriate accessories

• Piping diagrams

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 will affect the accuracy of the thermostat.

• Avoid installing the thermostat on outside walls. If such a

location is necessary, mount the thermostat on an insulated back plate (accessory item).

• Mount thermostats

been finished.

only after the wall surfaces have

Standard Mounting Options

1. Mount the thermostat according to the applicable figure (Figure-2 through Figure-8). See Figure-11 for mounting dimensions.

1/4 x 3/16 in. Barbed Coupling

21-611

for Plastic Tubing

(included with thermostat)

20-693

6 in. Tube Assembly

with Eyelets

(included with

thermostat)

Thermostat

Cover

(order separately)

Mounting Screws

(included with thermostat)

Figure-2 Flush Mounting of Thermostat,

Using Drywall Mounting Bracket.

20-714

Wall Plate

(included with

thermostat)

Polyethylene

Tubing Air Supply

Branch

21-473

Drywall Mounting

(order separately)

Main

Locate the thermostat where it will be exposed to an unrestricted circulation of air, which represents the average temperature of the controlled space.

6 in. Tube Assembly with Eyelets

20-693

(included with thermostat)

Thermostat

Cover

(order separately)

Polyethylene Tubing

Pre-plumbed Electrical Box

Wall

20-850 Plate

(2) Screws for Electrical

Box Mounting

(2) #6 Self-Tapping

Screws

Air Supply

Branch

Main

Figure-3 Flush Mounting of Thermostat, Using 20-850 Plate

and Pre-Plumbed Electrical Box.

Page 5

20-693

Bracket

6 in. Tube Assembly with Eyelets

(included with thermostat)

Thermostat

Wall Plate

Mounting Screws

Cover

(order separately)

(included with thermostat)

Figure-4 Thermostat Mounted with 22-022

Conversion Kit, Using Wall Plate and Skirt, to

Replace Competitive Thermostats.

6 in. Tube Assembly with Eyelets

20-693

(included with thermostat)

Bracket

Polyethylene Tubing

Air Supply

Main

Branch

Skirt

Polyethylene Tubing

Air Supply

Branch

Main

Air Supply Tubing

Branch

Main

Wall Plate

Pre-plumbed Electrical Box (optional)

3/16 in. Tygothane

Tubing with Eyelets

(included with thermostat)

Wall

Thermostat

3/16 in. x 1/4 in.

Barbed Coupling

(included with thermostat)

Insert

(2) #6 x 1 in.

2 4

Mounting Screws

Cover

(2) Thermostat

(for electrical box mounting)

Mounting Screws

(included with thermostat)

1 The pneumatic thermostat replacement kit 2218-632 includes

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 Thermostat Mounted with 22-023 Thermostat

Conversion Kit.

Thermostat

Mounting Screws

Cover

(order separately)

(included with thermostat)

Figure-5 Thermostat Mounted with 22-022

Conversion Kit, Using Wall Plate Only, to

Replace Competitive Thermostats.

Wall Plate

Remove Locator

and Adaptor

20-714

Wall Plate

(included with

thermostat)

Thermostat

¡F

¡C

Cover

(order separately)

Figure-7 Thermostat Installation Using

Block

20-693

6 in. Tube Assembly with Eyelets

(included with thermostat)

Mounting Screws

(included with thermostat)

Pipehead in Masonry Wall.

Polyethylene

Tubing

Air Supply

Branch

Main

20-710

Mortar Joint Fitting

(order separately)

Page 6

Polyethylene

Tubing

Air Supply

Branch

Main

20-716

20-689

Mounting Fitting with

8 ft. Copper Lines (order separately)

Insulating Back Plate

(order separately)

Cutouts

(partially formed

on underside)

20-693

6 in. Tube Assembly

with Eyelets

(included with

thermostat)

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 pipehead fitting by using the 22-022 thermostat conversion kit and the included instructions, plus the following:

1/4" Plastic Air Lines: Install the 1/4" barbed couplings into the air lines. Connect the tube assembly to the 3/16" end of these couplings.

1/4" Copper Air Lines: Solder the barbed couplings into the copper lines. The tube assembly can then be connected to the 3/16" end of the couplings.

CALIBRATION

Calibration of Single Bimetal Models

The 2218 series thermostats are factory calibrated with the throttling range set at 3 °F. They should not require calibration upon installation. However, if the throttling range is changed, or if limited summer control action at 8 psig main air pressure is required, recalibrate the thermostat 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 temperature with an accurate thermometer. This temperature

of the thermostat

. Take care not to breathe on, or place a hand near the bimetals, as this will result in an inaccurate reading.

3. Move the setpoint adjustment to the measured ambient temperature, using the internal setpoint indicator.

must be within the range

Standard Calibration

1. Taking care not to breathe on, or place the hand near the bimetal, use a 20-881 thermostat wrench (1/16” hex wrench) to turn the reverse acting calibration screw until the branch line pressure indicates 12 psig. Clockwise rotation increases the branch line pressure. Counterclockwise rotation decreases the branch line pressure.

2. Raise the main air pressure to 25 psig.

3. Turn the direct acting calibration screw until the test gauge indicates 12 psig. Clockwise rotation decreases the branch line pressure. Counterclockwise rotation increases the branch line pressure.

Cover Scale

Setpoint Adjustment

Setpont Indicator

Branch

Internal Setpoint

Indicator

Limit Stops (2)

(Accessory)

Thermostatic

Bimetal

Fahrenheit

T R

˚F ˚C

Pressure

Tap

Celsius

Scale

Reverse Acting

Calibration Scre

Scale

Direct Acting

Calibration Screw

Throttling Range

Switch-over

Calibration Screw

Adjustment Slide

Figure-9 Single Bimetal Thermostat Calibration

Features and Limit Stop Accessory.

Special Calibration — 8 psig Summer Control

1. Set the main air pressure to 8 psig.

2. Taking care not to breathe on, or place the hand near the bimetal, use a 20-881 thermostat wrench (1/16” hex wrench) to turn the reverse acting calibration screw until the branch line pressure indicates 6 psig. Clockwise rotation increases the branch line pressure. Counterclockwise rotation decreases the branch line pressure.

3. Raise the main air pressure to 25 psig.

4. Turn the direct acting calibration screw until the test gauge indicates 6 psig. Clockwise rotation decreases the branch line pressure. Counterclockwise rotation increases the branch line pressure.

Page 7

Switch Over Point Adjustment

If necessary, adjust the switch point as follows:

Note:

• The switch point adjustment requires changes to the

main air pressure, which could affect other parts of the system. This adjustment should instead be made on a test bench at which a variable main air supply is available.

• Install a test gauge into the branch line, so that this

pressure can be measured while making the switch point adjustment.

1. Set the main air pressure to the desired switch over point.

2. Move the setpoint adjustment to its farthest clockwise position.

3. Use a 20-881 thermostat wrench (1/16” hex wrench) to turn the switch over calibration screw, 1/8 turn at a time, until the branch pressure just drops to 0 psig. This sets the switch over point.

4. Recalibrate the thermostat according to the instructions in Standard Calibration or Special Calibration, as applicable.

5. Reinstall the thermostat cover and set the thermostat to the desired setpoint.

Calibration of Dual Bimetal Models

The 2218-301 thermostat is factory calibrated and should not require calibration upon installation. However, if the summer or winter setpoint requires calibration, or if the switch point needs to be raised or lowered, recalibrate the thermostat as follows:

1. Remove the thermostat cover and install a 22-138 branch tap gauge adaptor and a suitable 0 to 30 psig gauge into the branch pressure tap hole (Figure-10).

2. Measure the ambient temperature with an accurate thermometer. This temperature

of the thermostat

. Take care not to breathe on, or place a hand near the bimetals, as this will result in an inaccurate reading.

Summer Setpoint Calibration

1. Position the summer setpoint cam to the measured ambient temperature (Figure-10).

2. Set the main air pressure to 16 psig.

3. Adjust the summer calibration screw, using a 20-881 thermostat wrench (1/16” hex wrench), until the branch tap gauge reads 9 the branch line pressure. Counterclockwise rotation decreases the branch line pressure.

±1 psig. Clockwise rotation increases

must be within the range

3. The winter setpoint is in calibration when the winter setpoint dial indicates the ambient temperature within ±2 °F. If not, adjust the winter setpoint as follows:

a. Rotate the winter setpoint screw until the dial gently

contacts its stop. Clockwise rotation increases the ambient temperature reading, and counterclockwise rotation decreases the ambient temperature reading.

b. Continue rotating the setpoint screw approximately

1/8 turn, slippint the screw inside the dial.

c. Turn the setpoint screw back and check for 9 ±1 psig

branch air pressure, with the dial indicating the ambient temperature within ±2 °F.

d. Repeat steps a, b, and c, as necessary, until winter

setpoint calibration is obtained.

4. The winter setpoint screw may now be used to position the dial to the desired winter control point.

Cover Scale

Setpoint Adjustment

Limit Stops (2)

(Accessory)

Summer Setpoint

Summer

Bimetal

Fahrenheit

Scale

Winter

Bimetal

Winter Calibration and

Setpoint Screw

Setpont Indicator

Winter Setpoint Dial

Branch

Pressure

Tap

Celsius

Scale

Summer

Calibration

Screw

Switching

Screw

Figure-10 Dual Bimetal Thermostat Calibration

Features and Limit Stop Accessory.

Switch Over Point Adjustment

Adjust the switch over point as follows:

Note:

• The switch point adjustment requires changes to the

main air pressure, which could affect other parts of the system. This adjustment should instead be made on a test bench at which a variable main air supply is available.

• Install a test gauge into the branch line, so that this

pressure can be measured while making the switch point adjustment.

Winter Setpoint Calibration

1. Increase the main air pressure to 25 psig.

2. Using a 20-881 thermostat wrench (1/16” hex wrench), rotate the winter calibration screw until the branch tap gauge reads 9 branch line pressure. Counterclockwise rotation

±1 psig. Clockwise rotation increases the

1. Set the main air pressure to 15 psig.

2. Position the summer setpoint dial to 85 °F and the winter setoint dial to 44 °F.

3. The branch tap gauge should read 15 psig, minimum. If not, recheck the summer setpoint calibration.

decreases the branch line pressure.

Page 8

4. Slowly increase the main air pressure until the branch tap gauge drops to 0 psig. This is the main air pressure at which the thermostat switches from summer control to winter control.

5. If the main air pressure at the switching point is less than 17 psig or greater than 21 psig, adjust the switching screw as follows, using a 20-881 thermostat wrench (1/16” hex wrench):

a. If the switching point is less than 17 psig, turn the

switching screw 1/8 turn counterclockwise, to raise the switching point. Raise the main air pressure until the branch tap gauge reading drops to 0 psig (switching point). If the main air pressure at this point is still less than 17 psig, repeat this step, as necessary, until the switching point is obtained.

b. If the switching point is greater than 21 psig, turn the

switching screw 1/8 turn clockwise, to lower the switching point. Lower the main air pressure until the branch tap gauge reading drops to 0 psig (switching point). If the main air pressure at this point is still greater than 21 psig, repeat this step, as necessary, until the switching point is obtained.

4. Move the setpoint adjustment to the desired temperature, using the internal setpoint indicator.

5. Slide the stops to the desired limits and tighten both screws.

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

Caution:

Do not force the calibrating screws. If the desired action is not obtained when the screw is rotated, check to be sure the direction of rotation is correct.

6. Reinstall the thermostat cover and set the thermostat to the desired setpoint.

Concealed Adjustment

If concealment of the setpoint adjustment is required, install a 21-800 (black) or 21-801 (Euro-white) setpoint adjustment cover as follows:

1. Remove the thermostat cover.

2. Insert the adjustment cover through the slot at the top of the cover and bend the tangs outward on the inside of the cover.

3. Reinstall the cover onto the thermostat.

Internal Stop Kit (Accessory)

The internal stop kit, model 20-712, consists of two screws and two nuts (Figure-9 and Figure-10). Install this kit as follows:

1. Move the setpoint adjustment to one extreme limit.

2. Place a nut in the depression in the top plate and move the adjustment cam over the nut, to where the slot in the 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.

1/8

(.318)

2-1/32

(5.16)

1-1/4

(3.18)

1-3/8

(3.5)

Dimensions are in inches (mm).

Figure-11 Mounting Dimensions.

1-3/8

(3.5)

2-1/32

(5.16)

F-24579-2

TAC

1354 Clifford Avenue P.O. Box 2940 Loves Park, IL 61132-2940

www.tac.com