Johnson Controls T28 User manual

Installation Instructions T28

Issue Date 02/01/02

Part No. 24-9715-0, Rev. A www.johnsoncontrols.com

T28 Fan Coil Thermostat

Application Requirements

The T28 thermostats control line voltage fan coil units

and zone valves on heating, cooling, and a

combination of heating and cooling equipment. The

thermostats directly control one or two zone valves.

Thermostats with fan switches require a two-gang

switch box at least 2 1/2 in.-deep, or a 4 in. by 4 in. or

larger junction box with a two-fixture plaster ring. For

example, use Raco No. 230 or Appleton No.4SD1/2

two-gang switch box, plus plaster ring.

Thermostats without fan switches require a 2 in.-deep

single, vertical switch box or a larger box with a

single-fixture plaster ring. For example, use Raco

No. 420 or Appleton No. 111 single switch box.

Note: The boxes and plaster rings are not included

with the thermostat.

Installation

IMPORTANT: The T28 Series Thermostats are

intended to control equipment under normal

operating conditions. Where failure or malfunction of

a T28 thermostat could lead to an abnormal

operating condition that could cause personal injury

or damage to the equipment or other property, other

devices (limit or safety controls) or systems (alarm or

supervisory systems) intended to warn of, or protect

against, failure or malfunction of the T28 thermostat

must be incorporated into and maintained as part of

the control system.

Parts Included

•thermostat

•2 No. 6 screws

•2 fiber washers

Note: Plaster rings and switch box are not furnished.

Dimensions

Refer to Figure 1 and Figure 2 for detailed dimensions

of the T28 Fan Coil Thermostat.

Mounting

Location Considerations

Mount the thermostat about 4 to 5 ft. (1.2 to 1.5 m)

above the floor on an interior wall, where it can sense

the average room temperature. Do not mount the

thermostat where it may react to heat or cold from

water pipes, windows, doors, lamps, sunlight, or other

heat or cold sources.

On unit heater applications, place the thermostat

below and behind the heater in the path of air entering

the unit—not in the path of discharge air.

To mount the thermostat:

1. Install the switch box and plaster ring (when

required). See Figure 3.

2. Remove the cooling anticipator resistor to prevent

over-anticipation on 208/240 VAC installations.

Carefully clip the left-hand resistor leads with

diagonal cutters. See Figure 3.

3. Refer to Wiring section to make the necessary

connections.

4. Loosen the cover screw at the bottom of the cover,

swing the cover bottom out, and lift up to remove.

5. Fasten the thermostat to the switch box with the

two captive screws in the baseplate.

6. Carefully remove the contact protector (insulation

barrier). See Figure 3. Move the temperature

setting lever from Cool to Warm to be sure the

contact arm is free.

7. Reposition the cover, and tighten the cover screw.

8. Turn on the power supply.

9. Check the thermostat operation. Refer to the

Checkout section.

2 T28 Fan Coil Thermostat Installation Instructions

1.13

(29)

1.19

(30)

3.13

(80) 1.19

(30)

1.56

(40)

1.19

(30)

2.88

(73)

Two Mounting Holes for Number 6 Screws

3.28

(83)

5.19

(132)

Figure 1: T28 Without Fan Switch, in. (mm)

HIGH

OFF

MED

LOW

COOL

FA N

2.81

(71)

0.20

(5)

1.56

(40)

5.00

(127)

2.06

(52)

0.78

(20)

Two Mounting Holes for Number 6 Screws

5.19

(132)

1.19

(30)

2.67

(68)

3.08

(78)

3.28

(83)

Figure 2: T28 with Fan Switch, in. (mm)

Cover Insulation

Barrier

Mounting

Screws (2)

Cover

Screw

Fiber

Washer (2)

Two-gang

Switch Box

Junction

Box

Plaster

Ring

(Switch Box and

Plaster Ring Not Furnished)

Figure 3: Mounting the T28 to an Outlet Box, in. (mm)

T28 Fan Coil Thermostat Installation Instructions 3

Wiring

Make wiring connections using wire nuts or other

approved solderless connectors. See wiring diagrams

for proper connections.

WARNING: Risk of Electrical Shock.

Disconnect the electrical power supply before

making the wiring connections to avoid possible

electrical shock or damage to the equipment. On

multiple circuit units, more than one circuit may have

to be disconnected.

Cooling

to Fan

Blue

Tan

Ye ll ow

Red to

Cooling

Orange (hot) to L

Off LO

Figure 4: T28BD Cooling Thermostat with

“Off-HI-MED-LO” Fan Switch

Heating-Cooling

to Fan

Blue

Tan

Ye ll ow

Orange

(hot) to L

Off LO

Brown

to Heating

Red to

Cooling

Figure 5: T28CD Heating-Cooling Thermostat with

“Off-HI-MED-LO” Fan Switch

Sequenced Heating-Cooling

Note: Sequenced heating-cooling models have a

deadband allowing automatic changeover on

three-pipe or four-pipe systems.

No Fan Selector

HEATING - COOLING

Red to Cooling

Orange (hot) to L

Brown to Heating

Figure 6: T28DA Sequenced Heating-Cooling

Thermostat

Fan “OFF” Closes Cooling Valve

Orange

(hot) to L

Blue to Fan

Off

On h

Brown

to Heating

Red to

Cooling

Figure 7: T28DB Sequenced Heating-Cooling

Thermostat with “Off-On” Fan Switch

to Fan

Blue

Tan

Ye ll ow

Orange

(hot) to L

Off

Brown

to Heating

Red to

Cooling

Fan “OFF” Closes Heating

and Cooling Valves

Note:

Figure 8: T28DD Sequenced Heating-Cooling

Thermostat with “Off-HI-MED-LO” Fan Switch

Orange

(hot) to L

Off On

Brown

to Heating

Red to

Cooling

to Fan

Blue

Tan

Yellow

Figure 9: T28DG Sequenced Heating-Cooling

Thermostat with “Off-HI-MED-LO” Fan Switch

4 T28 Fan Coil Thermostat Installation Instructions

Table 1: Electrical Ratings (In Amperes)

Thermostat (Pilot Duty)

Cooling Heating Fan Switch

Volts, AC

Normal Inrush Normal Inrush Full Load Locked Rotor

120 0.32 1.0 0.12 0.36 5.8 34.8

208 0.18 0.57 0.07 0.21 3.3 19.8

240 0.16 0.50 0.06 0.18 2.9 17.4

Setup and Adjustments

Calibration

If the thermostat has a thermometer in the cover,

recalibrate the thermometer by following the steps

below:

1. Remove the thermostat cover.

2. Place an accurate test thermometer and the cover

side-by-side, allowing both the test thermometer

and the cover thermometer to reach a stable

temperature before adjusting.

3. Carefully turn the hex nut behind the insulator with

a thin wrench until the pointer corresponds to the

temperature indicated by the test thermometer.

Checkout

Before leaving the installation, observe at least three

complete operating cycles to ensure that all

components are functioning correctly. Follow the steps

below:

1. Move the lever toward Warm to raise the

temperature setting to check the heating cycle.

2. Move the lever toward Cool to lower the

temperature setting to check the cooling cycle.

The center of the scale is approximately 75°F

(24°C).

Repairs and Replacement

Field repairs must not be made. For a replacement

thermostat, contact the nearest Johnson Controls

representative.

T28 Fan Coil Thermostat Installation Instructions 5

Technical Data

Product T28 Fan Coil Thermostat

Thermostat 55 to 95°F (12 to 35°C)

Range Thermometer 55 to 85°F (12 to 30°C)

Heating 0.6F° (0.3C°)

Cooling 1F° (0.5C°) for typical 120 V Fan Coil Valve Loads

Nominal Operating

Differential Heating-Cooling Models with Automatic Changeover (T28D) have a 6F° (3.3C°)

Differential from Heating On to Cooling On

Adjustment Cool to Warm

Contact Action Snap-acting Bimetal-operated

Baseplate Cold Rolled Steel, Baked on Beige Paint

Material and Finish Cover Cold Rolled Steel, Baked on Ivory Paint

Thermometer Bimetal Type for Accuracy and Clarity, may be Field Adjusted

Without Fan Switch Standard Outlet Box with Captive Screws

Mounting With Fan Switch Mounts to a Two-Gang Switch Box

Wiring Connections Color Coded 18 AWG Wire Leads, 6 in. (152 mm) Long

Individual Pack - 1.0 lb (0.45 kg)

Without Fan Switch Overpack of 20 Units - 23.6 lb (10.7 kg)

Individual Pack - 1.3 lb (0.59 kg)

Shipping Weight

With Fan Switch Overpack of 20 units - 29.5 lb (13.4 kg)

Agency Listings UL Listed: File E6688, CCN XAPX

The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these

specifications, consult the local Johnson Controls office. Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or

misuse of its products.

Controls Group

507 E. Michigan Street

P.O. Box 423 Printed in U.S.A.

Milwaukee, WI 53201 www.johnsoncontrols.com

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