T.A.C. TK-6024, TK-6124, TK-8024, TK-8124 User Guide

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APPLICATION

For proportional temperature control of pneumatic valves and actuators to maintain air or liquid tempe rat ures in duct, plenum chambers , li quid lines, tanks , et c. May also be used as a low limit thermostat.

SPECIFICATIONS

Thermostat: Proportiona l two pipe type. Thermostats are

ambient compens ated.

Sens ing Ele m ent: Remote liquid-fi lled copper. Control Dial Range: -20 to 240°F ( -29 t o 115°C). Shipped

as -20 to 120°F, reverse side of dial 100 to 240°F. Throttling Range: Adjustab le 3 t o 35°F /10 psi (2 to 19°C/69 kPa) change in output , factory set at 5°F (3°C). Output Air Signal: 0.5 psig (3.4 kPa) to suppl y a ir pr essure

-0.5 (-3. 4 kP a ).

Action: See Table 1. Ambient Limits:

Shipping, -40 to 150°F ( -40 t o 65°C). 0 to 98% R.H.,

non-condensing. Case Operating, 40 to 150°F (4 to 65°C). 10 to 98% R.H., non-condensing.

Bulb, 310°F (154°C) maximum.

Supply Air Pressure: Clean, oil free, dry ai r required

(reference EN-123).

Nominal, 20 psig (138 kPa). Minimum, 15 psig (103 kPa). Maximum, 30 psig (207 kPa).

Air Connections: 1/8" FNPT for main, branches and

AL-362 gauges (not i ncluded). Air Consumption for Sizing Air compres sor: 0.008 scfm (3.8 ml/s).

Air Capacity for Sizing Air Mains: 16 scim (4.4 ml/s). Mounting: Upright position on a wall or vert ical flat surface. Bulb Dimensions: See T able 1. Capillary Length: 6’ (1.8 m). Case Dimensions: 5-13/16" high x 6- 3/16" wide x 4" deep

(148 mm x 157 mm x 102 mm).

ACCESSORIES

AL-362 Stem mounted back connected 0-30 psi gauge AT-201 3/8" x 9-1/2" with 3/4" MNPT copper bulb well

requires AT-209

AT-203 3/8" x 9-1/2" with 3/4" MNPT stainless steel bulb

well requires AT-209 AT-206 3/8" x 4-1/2" with 1/2" MNPT copper bulb well AT-208 Duct mo un ting kit AT-209 Liquid line or tank mounting kit AT-211 Bulb shie ld AT-539 Pilot pressure kit TOOL-95 Pneumatic calibration tool kit (required for use

as low limit thermostat)

TK-6024, TK-6124, TK-8024,

TK-8124

Pneumatic Bulb Thermostats

General Instructions

MAINTENANCE PARTS

AT-520-011 Relay repair kit AT-528 Pilot restrictor kit DYDK- 77-031 Thermal element for TK-8X24 DYDK- 99-011 Thermal element for TK-6X24

Figure-1 Piping Connections.

Table-1 Specifications.

Bulb

Part Number Action

TK-6024

TK-8024 Averaging

TK-6124

TK-8124 Averaging

Direct Acting (DA) - increase output pressure on temperature rise. Reverse Acting (RA) - Decrease output pressure on temperature rise.

Style

Straight

Dimensions

in (mm)

3/8 x 4-5/ 8 (9.5 x 117)

3/32 x 8’

(2.4 x 2.4 m)

3/8 x 4-5/ 8 (9.5 x 117)

3/32 x 8’

(2.4 x 2.4 m)

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PRE-INSTALLATION Inspection

Visually insp ect the car ton for damage . If da maged, not ify t he appropriat e carrier imme diately. Visuall y inspect the device for obvious defects. Return damaged or defective products.

Required Installation Items

• Tools (not provided):

Appropriate dri ll , drill bits and screwdriver for mounting screws

Needle nose pliers or 3/ 16" open-ended wrench to hold dial shaft

• Appropriate Accessories

• Mounting screws and appropriate fitt ings (not provided)

INSTALLATION

Caution:

technician. Make all connections in accordance with the job piping diagrams, local and national codes. Avoid locations near steam or hot water coils or pipes, or wherever radiant heat will affect the bulb or cap il lary tube.

Installer must be a qualified, experienc ed

THERMOSTAT MOUNTING

Mount the thermostat in an upright position on a wall or vertical fla t surface that does not vibrate.

Three (3) mountin g holes 3/16

" (5 mm) pr ovided on cas e.

BULB MOUNTING

Table-2 Liquid Line and Tank for TK-6X24.

Part Number Description Mt. Fitting

AT-201 AT-203

AT-206 Copper bulb well 1/2" MNPT

AT-209

Requires AT-208.

Recommended installation is with a bulb well.

Copper bulb well

Stainless steel bulb

well

Bulb mounting kit 3/4" MNPT

3/4" MNPT

Insertion

Size

1/2" dia.

OD (9-1/2”

long

1/2" dia.

OD 4-1/2"

long

Lengt h of

bulb

Figure-2 Mounting Dimensions.

Figure-3 Bulb Well Install ation.

Table-3 Application Limitati ons at 250°F Fluid Temp.

(Max. 350°F)

Part Number

AT-201 11 250 AT-203 20 500 AT-206 11 250 AT-209 4150

Max. Recommended

Velocity (FPS)

Max. Recommended Stati c Pressur e

(psig)

Installation of TK-6X24 Bulb into AT-206 Bulb Well

1. Install AT-206 bulb well into 1/2" FNPT opening.

2. Place packing (included with AT-206) over bulb support section a nd in s er t b ul b into w e ll.

3. Push packing into nut on well using a screwdr iver.

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Figure-4 Installation of TK-6X24 into AT-206 Bulb Well.

Installation of TK-6X 24 Bulb in to AT -201 or AT-203 Bulb Well (Requires AT-209 Kit)

Outdoor Installation of TK-6X24

Install with AT-211 kit as shown below.

1. Mount bulb to outside wall or surface with bulb clip.

2. Place shield over bul b and fasten to mounting surface.

1. Install bulb well or adaptor from AT-209 into 3/4" FNPT opening.

2. Place packing nut, washers and packi ng fr om AT-209 over bulb support section and insert bulb into well or AT-209 adaptor.

3. Push interlocking washers and packing into well or adaptor and tighten packing nut until firmly sealed.

Figure-5 Installati on of TK-6X24 Bulb int o AT-201 or AT-203

Bulb Well with Required AT-20 9 Kit .

Duct Instal lation of TK-8X24

Install avera ging bulb mounting with two AT-208 kits as sho wn below.

Figure-7 Installation of TK-6X24 Using AT-211 Outside Bulb

Shield.

Duct Installation of TK-6X24

Install bulb with AT-208 kit as shown below.

Figure-8 Installation of TK-6X24 Using AT-208 Duct

Mounting Kit.

ADJUSTMENTS

Thermostats are shi pped from the factory calibr ated to provide an 8 psig control line pressur e when the cont rol point is equal to the setpoint.

To make all adjustments, remove the cover by first lo osening the cover screws. Squeeze sli ghtly on the top and bot tom and pull forward and down, unhooking the top first.

Setpoint Dial

The thermostat has a total dial range of -20° to +240°F. One side of the dial i s marked -20 to 120 and the other 10 0 to 240. If a setpoint higher than 120° is required, proceed as follows:

1. Rotate setpoint dial to 110°.

Figure-6 Installation of TK-8X24 Using AT-208 Duct

Mounting Kit.

Note:

Access panel ma y be requi red t o allow f or ty ing bul b to

copper after it i s installed in the duct.

2. using a 3/16 setpoint dial.

3. Loosen screw that holds dial in place and remove.

4. Remove dial and turn over to the 100 to 240 side.

5. Start screw int o dial po st, bef ore tight ening l ine up di al at 110°, and tighten. Be sure to hold dial post with wrench when tightening screw ti ght.

6. Proceed with standard throttling rang e and calibration procedures.

" open end wrench, hold hex shaft below

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Throttling Range

The throttling range should be set at the lowest value which will allow th e thermostat to control the system without cyclin g under norm al load conditions. The most

satisfactory setting will vary with he type of control system. The throttling range is changed by sliding the throttling range adjustment sl ider to its proper position. See Figure 9. Calibration of the thermostat should be checked after the throttling range has been changed. When making the throttling range adjustment, ca re should be taken to prevent excessive side forces on the feedback lever. In no case should the pi vot poi nt be r aised when the a djust ment is made .

Throttling Range Adjustment

If the throttl ing range of the thermostat as shi pped is not satisfactory, proceed as follows:

1. Move slid er to appr oxim ate posi tion desi red (see F igu re 9) .

2. With instrument measuring a stable temperature, rota te setpoint dial CCW to low end of scal e, then CW to that temperature “s etpoint”.

3. Adjust setpoint calibration screw until 3 psig (RA) or 13 psig (DA) is read on branch gauge.

4. Rotate setpoint dial CW toward upper end of scale until 13 psig (RA) or 3 psig (DA) is read on branch gauge.

5. Difference between setp oint dial read ing s in st ep 2 and 4 is the approximate m echanical throttli ng range of the thermostat. The thermal throttli ng range will be equal to or less than the mechani cal throttling range.

6. If the throttling range in step 5 does not provide the control desi red, move throttling range slider in appropriat e direction and repeat steps 2 through 5 until desired contr ol is obtained. I f unable to obtain sat isfactory control, check system for proper sizing of components being controlled and sensing element location.

Figure-9 Thermost at Adjustments.

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CALIBRATION

After the installation has been completed, the thermostat should be checked for calibration. As a nominal cali bration, the controlled branch pressure should be 8 psig when the setpoint is equal to the bulb temperature, indicated by a thermometer loc ated near the bulb. In some applications, a value other than 8 psig wi ll be required to get the desired control results. Change the 8 psig will be requir ed to get the desired contr ol results. Change the 8 psig designation as used in the calibration procedure, should this be the case.

1. Using the branch gauges, or a separate test gauge connected to the branch test port (see Note), rotate the dial [direct acting (DA) - lower, reverse acting (RA) - raise] in the appropriate direction. The branch pressure should raise to be the same as the supply pressure ±1 psi.

Note:

As shown in Figure 9, each thermostat is furnished with a branch test connection. If a test gauge is to be used at this connection, use a 5/64" Allen wrench to unsc rew (countercl ockwise) the test point scr ew one full turn before attaching te st gauge.

2. Measure the temperature at the bulb. Thi s mu st be a stable tempera ture.

3. Rotate the dial to this temperature.

4. Turn the setpoint calibration screw (see Figure 9) until a branch pressure of 8 psig ±1 psi is read on the branch gauge.

1. Remove restriction cover plate, restriction and two gaskets (see Figure 9 for location).

2. Using the parts from the AT-539 place in order one gasket, restrictor plate, the other gasket and cover plate with the tubing attached on the restrictor mount ing pad. Then install the two (2) screws.

3. Route 5/32" pla stic tubing through hole i n base and connect to constant 15 or 20 psig main.

Calibration When Used As Low Limit

1. Determine throttling range required . This normally is appro ximate ly 10°F.

2. Adjust branc h pressure from first thermos tat to maximum branch pressure.

3. Adjust thro tt li ng range as described in Thro ttling Range Adjustment on page 3.

4. After thrott ling range is ad justed, proceed with calib ration of control point as descr ibed in Calibration.

FIELD SERVICE

Relay repair kit, pilot restrictor and thermal elements are available. See Maintenance Parts on page 1 for specific part numbers.

Note:

The hex nut on the adjusting screw is used to provide tension only and should not be loosened when making adjustments.

5. Turn the dial to the desired setpoint.

6. If separate test gauge is used, remove gau ge, tighten test point screw and replace cover.

7. Observe operation of system for satisfactory control. If necessary, recalibrate after system has come in control and stabilized.

USE AS A LOW LIMIT THERMOSTAT

These thermostats may be used as low limit thermostats. Normally in this application, they are used in series with the branch pressure of another proportional thermostat. When using two proportional thermostats in series, the second unit must have an exter nal main air source for the pilot cham ber of the thermostat. This is required to insure the operation of the second thermostat at low branch pressure fr om the first thermostat. An external pilot pressure kit is required for this. The part number of this kit is AT-539.

Attachment of AT-539

To attach the AT-539 external pilot pressure kit, use the following procedure.

MAINTENANCE

Regular maintenance of the total system is recommended to assure sustained optimum performance.

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F-14684-4

TAC

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

www.tac.com