Johnson Controls Penn A19K Series Manuale utente

Installation Sheets Manual 121

Temperature Controls Section

Technical Bulletin A19K, A28K

Issue Date 0119

Code No. LIT-121078

Part No. 996-241, Rev. A

A19K, A28K Series

Industrial Controls

Application

These controls are for

refrigeration, air conditioning

and heating applications.

Control ranges are available to

cover working temperatures

from -30 to 550°F (-35 to

288°C). Controls have NEMA

3R rainproof enclosure for a

broad range of industrial and

general purpose applications.

The A19 single-stage controls

are available with open low,

open high or SPDT contact

action. The A28 two-stage

controls have SPDT contact

action on both switches.

All Series A19K and A28K

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.

Operation

When the temperature increases

to the control dial setting on the

single-pole, double-throw model,

the circuit between “R” and “Y”

closes. Simultaneously the

circuit between “R” and “B”

opens.

Figure 3 illustrates the two-stage

operation of the A28KA and

A28KJ. 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

Mount the control with the

conduit connector pointing

down. Mount to any flat surface

with screws or bolts through the

rubber bushing in the three

mounting feet. (See Fig. 1.)

CAUTION: Do not dent or

deform the sensitive bulb

(element) 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 installing the bulb in a

closed tank, turn off liquid

supply, relieve pressure and

lower liquid level below the

opening before installing or

removing the bulb or bulb well.

For closed tank applications

without well assembly Part

No. FTG13A-600R packing nut

assembly may be supplied. This

packing nut is for applications

where the temperature does not

fall below -35°F (-37°C) or

exceed +250°F (121°C).

Maximum liquid pressure limit is

150 PSIG (1034 kPa). See Fig.

4 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. Push bulb into position

in bottom of well. Replace

bushing into bulb well.

Tighten set screw in end of

adapter to hold bulb in position.

See Fig. 5 for bulb well

illustration.

Wiring

WARNING: Disconnect

power supply before

wiring connections are

made to avoid electrical

shock or possible

damage to equipment.

Fig. 1 -- Industrial control with

remote bulb.

2A19K, A28K Technical Bulletin

Make all wiring connections

using copper conductors only,

and in accordance with the

National Electric Code and local

regulations.

Remove the knob by loosening

the set screw and remove the

cover to make wiring

connections. Make splices in

junction boxes using solderless

connectors or by soldering and

then taping the connections.

Do not use on applications

where electrical ratings exceed

the rating shown on the control’s

label.

CAUTION: Use terminal

screws furnished (8-32 ×

1/4 in. binder head).

Substitution of other

screws may cause

problems in making proper

connections.

Adjustment

The setting is changed by

turning knob on front of control.

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 as

follows:

1. A19K -- Ventilating or

Cooling System: Turn dial

clockwise to a setting above

temperature of controlled

medium. Fan or cooling

system should be off.

When dial is turned

counterclockwise, the fan or

cooling system should turn

on at approximately the dial

setting.

2. A19K -- Heating System:

Turn dial clockwise above

the temperature of

controlled medium. The

heating unit should be on.

When dial is turned

counterclockwise, the

heating unit should turn off

at approximately the dial

setting.

3. A28K -- When wired as

shown in Fig. 3, the damper

should open as the dial is

turned counterclockwise.

The devices should operate

in reverse sequence when

the dial is turned clockwise

to a higher setting.

If the controls 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 control, contact

the nearest Johnson Controls

distributor.

www.penncontrols.com

® Johnson Controls and PENN are registered trademarks of Johnson Controls in the

United States of America and/or other countries. All other trademarks used herein are the property

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