Johnson Controls A19 Series Manuale utente

Installation Sheets Manual 121

Temperature Controls Section A

Technical Bulletin A19

Issue Date 0316

Code No. LIT-121015

Part No. 997-349, Rev. H

A19 Series Temperature Controls -- Single-Pole,

Single-Throw and Single-Pole, Double-Throw

Models with NEMA 1 Enclosure

Application

These controls are designed to

cover a broad range of general

purpose operating temperature

control applications in the

refrigeration, air conditioning and

heating field with a minimum

number of models. Typical

applications are: frozen food cases,

display cases, beverage coolers,

milk coolers, etc. Various control

ranges are available.

Controls are supplied with an

adjustable range (except models

with factory sealed settings) and

adjustable or nonadjustable

differential.

All Series A19 temperature

controls 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.

Installation

Follow equipment manufacturer’s

instructions if provided. If

instructions are not provided

proceed as follows:

Mounting

Controls are normally mounted to a

surface through holes in back of

case.

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 control’s calibration and

operation.

For closed tank applications without

well assembly Part No. FTG13A-

600R packing nut assembly may be

supplied. See Fig. 2 for sequence

of installation. Put parts over

support tube section of element,

placing bulb into tank. Tighten

1/2 in. NPT adapter. Screw packing

nut into adapter with the retaining

washers and packing in place as

shown.

To install models supplied with bulb

well, first install bulb well into tank.

Remove bushing from bulb well and

slide bushing over capillary.

Replace bushing into bulb well.

Push bulb into position in bottom of

well. Tighten set screw in end of

adapter to hold bulb in position.

See Fig. 3 for bulb well illustration.

CAUTION: Do not dent or

deform the sensitive bulb of

this control. A dent or

deformation will change the

calibration and cause the

control to cycle at a

temperature lower than the

dial setting. When the bulb

mounting clip is used to

mount the bulb near the

refrigerant tubing, be sure

the sheet metal screw does

not pierce the tubing.

Fig. 1 -- An A19 with external range

adjustment and screwdriver slot.

Adjustments

The A19 temperature controls may

be supplied with an external range

adjustment and screwdriver slot as

shown in Fig. 1, range adjustment

knob or solid cover. Solid cover

models with calibrated dial are

adjusted by removing the cover and

moving dial so the desired setting is

in line with the dial pointer on the

stop bracket. (See Fig. 5.)

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

convertible adjustment models with

remote bulb include a bulb

mounting clip.

2A19 Technical Bulletin

Fig. 2 -- Part No. FTG13A-600R

packing nut assembly. (Used with

swaged bulb with support tube for

direct immersion application.)

Fig. 3 -- Bulb well for liquid

immersion applications where a

temperature bulb may be removed

without draining tank.

Dial settings normally indicate the

cutout setting unless otherwise

specified by the equipment

manufacturer. Models with SPDT

contacts are normally set so the red

(common) to yellow contacts open

at the dial setting.

Models with adjustable differential

and ranges of 20/80°F (-5/28°C),

-30/50°F (-35/10°C) and -30/100°F

(-35/40°C) have a differential scale

plate showing increments of

differential. Other ranges have a

scale plate with a multiplier. For

example when “MIN” differential is

5F°(2.8C°) then x2 is 10F°(5.6C°),

x3 is 15F°(8.3C°), etc. The

controls are supplied with adjusting

lever at minimum differential

stamped on the control. To adjust

move the lever to the differential

required.

Low cutout or high cutout stop

supplied on certain models

(specified by the equipment

manufacturer).

Fig. 4 -- Terminal arrangement of

SPDT models.

If high or low cutout stop adjustment

is required proceed as follows:

1. Set dial to temperature at

which stop is desired.

2. Remove cover of the control.

3. Loosen the cutout stop screw,

slide the screw to the front of

the temperature control against

the plastic step behind the dial

and tighten the screw. (See

Fig. 5.) Sometimes an exact

stop setting is not possible and

stop must be set to the closest

stop corresponding to dial

setting required.

4. Replace cover.

Wiring

CAUTION: Disconnect

power supply before

wiring connections are

made to avoid possible

electrical shock or

damage to equipment.

All wiring should conform to the

National Electrical Code and local

codes. Single-pole, double-throw

models should be wired as shown

in Fig. 4. Use copper conductor

only.

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 applying power, make sure

installation and wiring connections

are according to job specifications.

After the necessary mechanical

adjustment and electrical

connections have been made, an

operational checkout is

recommended.

Adjust the control setpoint to put the

system in operation and observe at

least three complete operating

cycles to be sure that all

components are functioning

correctly.

If the system fails to operate,

recheck the wiring and components.

Repairs and Replacement

Field repairs must not be made.

For a replacement control contact

the nearest Johnson Controls

representative.

Fig. 5 -- All models have a screw

type cutout stop. The stop screw

must be loosened and moved to

the stop setting desired. Tighten

screw after setting is made.

A19 Technical Bulletin 3

European Single Point of Contact:

NA/SA Single Point of Contact:

APAC Single Point of Contact:

JOHNSON CONTROLS

WESTENDHOF 3

45143 ESSEN

GERMANY

JOHNSON CONTROLS

507 E MICHIGAN ST

MILWAUKEE WI 53202

USA

JOHNSON CONTROLS

C/O CONTROLS PRODUCT MANAGEMENT

NO. 22 BLOCK D NEW DISTRICT

WUXI JIANGSU PROVINCE 214142

CHINA

Controls Group

507 E. Michigan Street

P.O. Box 423

Printed in U.S.A.

Milwaukee, WI 53202

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