Johnson Controls T28 Series Manual de usuario

Installation Sheets Manual 121

Room Thermostats Section

Technical Bulletin T28

Issue Date 0484

Code No. LIT-121640

T28 Series

Fan Coil Thermostats

Application

The T28 thermostat controls line

voltage fan coil and heating

zone valves on heating, cooling,

and combination heating-cooling

systems. The thermostats can

be used to directly control one or

two zone valves. Models are

available for automatic change-

over by the thermostat or from a

changeover control.

Thermostats are available with

or without fan switches.

All Series T28 thermostats are

designed for use only as

operating controls. Where an

operating control failure would

result in personal injury and/or

loss of property, it is the

responsibility of the installer to

add devices (safety, limit

controls) that protect against, or

systems (alarm, supervisory

systems) that warn of control

failure.

Operation

The T28 controls space

temperature by automatically

cycling a valve. Heating

contacts make on a drop in

temperature, opening a fan coil

valve to permit flow of hot water.

Cooling contacts make on a rise

in temperature, opening a fan

coil valve to permit flow of cold

water. Air circulation across the

coil may be controlled manually

with the fan switch models.

Note: The T28 thermostat with

a fan switch keeps the cooling

valve closed when the fan switch

is in the “OFF” position.

Installation

The thermostat should be

mounted 4 to 5 ft (1.2 to 1.5m)

above the floor on an interior

wall in a location where it will be

subjected to and affected by

average room temperature. Do

not mount the thermostat where

it may be affected by heat or

cold from water pipes, windows,

doors, lamps, sunlight, or other

heat or cold sources.

Thermostats with fan switches

require a two-gang switch box at

least 2-1/2 in. deep, or a

4 in. x 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 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.

Install the thermostat as follows:

CAUTION: Disconnect the

power supply before wiring

connections are made to

prevent possible electrical

shock or damage to

equipment.

1. Install the switch box and

plaster ring (when required).

2. On 208/240 V. A.C.

installations, remove the

cooling anticipator to

prevent over-anticipation.

Carefully clip the left-hand

resistor leads with diagonal

cutters. (See Fig. 4.)

3. Make wiring connections

using solderless connectors

or other approved

connectors. See Wiring

Diagrams for proper

hookup. Wire leads are

color coded for easy wiring

identification.

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. Move the

temperature setting lever

from Cool to Warm to be

sure the contact arm is free.

7. Replace the cover and

tighten the cover screw.

8. Connect the power supply.

9. Check the thermostat

operation.

Fig. 2 -- Interior of a T28CA

Thermostat.

Fig. 1 -- T28 Thermostat with

fan switch.

2 T28 Technical Bulletin

Checkout Procedure

Before leaving the installation,

observe at least three complete

operating cycles to be sure that

all components are functioning

correctly.

1. Move 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).

Service

If the thermostat has a

thermometer in the cover, the

thermometer can be

recalibrated. Remove the

thermostat cover. Place an

accurate test thermometer and

the cover side by side and allow

to reach a stable temperature

before adjusting. Carefully turn

the hex nut behind the insulator

with a thin wrench until the

pointer corresponds to the test

thermometer.

Repairs and Replacement

Field repairs must not be made.

For a replacement thermostat,

contact the nearest Johnson

Controls wholesaler.

Fig 4 -- Remove the cold anticipator resistor for

208/240 V. service by clipping the leads at point

“A” and “B”.

T28 Technical Bulletin 3

4 T28 Technical Bulletin

Controls Group

507 E. Michigan Street

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

Milwaukee, WI 53202

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