Johnson Controls A19BAC Manuel utilisateur

Installation Sheets Manual 121

Temperature Controls Section

Technical Bulletin A19BAC, A28AA

Issue Date 0588

Code No. LIT-121077

A19BAC, A28AA Single and Two-Stage Space Thermostats

For Farm and General Purpose Applications

Application

The single-stage A19BAC and

the two-stage A28AA

thermostats incorporate single-

pole double-throw switches for

controlling automatic ventilation

or heating in livestock barns,

poultry houses, milk houses,

brooder houses and other

buildings. The 30 to 110°F (0 to

43°C) and 0 to 140°F (-15 to

60°C) temperature ranges

permit use for many space

applications.

All Series A19 and A28 space

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) or systems (alarm,

supervisory systems) that

protect against, or warn of,

control failure.

Operation

On a temperature increase to

the dial setting, the circuit

between R and Y closes.

Simultaneously the R and B

circuit opens.

Figure 3 illustrates the operation

of the A28AA. On a temperature

increase to the dial setting, the

circuit between R and Y of the

low stage switch (RYL) closes.

Simultaneously the circuit

between R and B (RBL) opens.

On a further increase in

temperature the high stage

switch operates and closes RYH

while simultaneously opening

RBH. The reverse sequencing

takes place on a temperature

fall.

Installation

Mounting

Mounting may be by wiring

conduit or to a flat surface with

screws through holes provided

in back of frame.

CAUTION: On rough

mounting surfaces use the

top two mounting holes

only. When these controls

are mounted on an uneven

surface using screws in all

four holes, the case can be

twisted enough to affect

the thermostat’s calibration

and operation.

Mount the thermostat 5 to 6 feet

above the floor where it will be

exposed to the average

temperature of the controlled

space. Do not mount where it

will be affected by unusual heat

or cold, such as directly over an

animal stall or in sunlight. Avoid

locations near a door, window or

hay chute. Do not mount on an

outside wall or where maximum

ambient temperature exceeds

140°F (60°C).

CAUTION: Do not dent or

deform the sensitive bulb

of this thermostat. A dent

or deformation will change

the calibration and cause

the thermostat to cycle at a

temperature lower than the

dial setting.

Adjustment

Knob adjustment or screwdriver

slot is supplied on the range

screw. Dial pointer is located on

cutout stop bracket on knob and

screwdriver adjustment models.

Solid cover models are adjusted

by removing cover and moving

dial so set point is in line with

dial pointer on the stop bracket.

(See Fig. 4.)

Fig. 1 -- Exterior view of Space

Thermostat.

Convertible adjustment models

can be field converted from

concealed screwdriver slot

adjustment to knob adjustment

or external screwdriver slot

adjustment. They are supplied

with a snap-in plug in the cover

to provide concealed

screwdriver slot adjustment. For

knob adjustment remove the

snap-in plug and press the knob

onto the slotted shaft. For

external screwdriver slot

adjustment remove the snap-in

plug.

The A28AA switch is stamped to

indicate the HI-TEMP switch and

the LO-TEMP switch.

A high temperature cutout stop

is supplied on the thermostats.

(See Fig. 4.) If cutout stop is

required proceed as follows:

1. Set dial to temperature at

which stop is desired.

Fig. 2 -- The Space Thermostats

with convertible adjustment

have a snap-in plug in the

cover, built-in screwdriver slot

and a knob for field installation.

2 A19BAC, A28AA Technical Bulletin

2. Remove cover from

thermostat.

3. Loosen the cutout stop

screw, slide the screw to the

front of the thermostat

against the plastic stop

behind the dial and tighten

the screw. (See Fig. 4.)

Sometimes an exact stop

setting is not possible and

stop must be set to the

closest step corresponding

to dial setting required.

4. Turn dial to set point

desired.

5. Replace cover.

Wiring

CAUTION: Disconnect

power supply before wiring

connections are made to

avoid electrical shock or

possible damage to

equipment.

All wiring should conform to local

codes and the National

Electrical Code. Use copper

conductors only. Do not use on

applications where electrical

ratings exceed ratings shown on

the thermostat’s cover label.

See Figs. 5 through 11 for

typical wiring applications.

CAUTION: Use terminal

screws furnished

(8-32 ×1/4 in. binder

head). Substitution of

other screws may cause

problems in making proper

connections.

Checkout Procedure

Before leaving the installation,

observe at least three complete

operating cycles to be sure that

all components are functioning

correctly.

Check for correct operation in

the following manner.

1. A19BAC -- Ventilating or

Cooling System: Turn dial

clockwise to a setting above

space temperature. Fan or

cooling system should be

off. When dial is turned

counterclockwise, the fan or

cooling system should turn

on approximately at the dial

setting.

A19BAC -- Heating System:

Turn dial clockwise above

the space temperature; the

heating unit should be on.

When dial is turned

counterclockwise, the

heating unit should turn off

approximately at the dial

setting.

2. A28AA -- If hookup is similar to

Fig. 8, fan should start at

approximately space

temperature and should

change to high speed as the

dial is turned counterclockwise

to a lower temperature setting.

If wiring is similar to Fig. 9, the

damper should open as the

dial is turned counterclockwise.

The devices should act in

reverse sequence when the

dial is turned clockwise to a

higher setting.

3. If control devices do not

operate in the manner

described above, check all

wiring for short circuits and

tightness of wiring

connections. If controlled

devices operate in reverse

(start in high or fully open

position) check wiring as it is

probably reversed.

Repairs and Replacement

Field repairs must not be made.

For replacement thermostat

contact the nearest Johnson

Controls wholesaler.

A19BAC, A28AA Technical Bulletin 3

4 A19BAC, A28AA Technical Bulletin

Notes

Controls Group

507 E. Michigan Street

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

Milwaukee, WI 53202

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