Johnson Controls A19ZBC Series Manuale di servizio

FANs 121, 125

Temperature Controls Section A

Technical Bulletin A19ZBC

Issue Date 1291

Code No. LIT-121071

Part No. 996-460

A19ZBC Type

Temperature Control

Application

The A19ZBC is used for general

purpose operating temperature

control applications. The control

has a single-pole, double-throw

contact unit and a temperature

range of 0 to 70°F (-15 to 25°C).

A packing nut assembly, Part

No. FTG13A-600R, (Fig. 2) and

a bulb well No. WEL14A-602R

(Fig. 3) for immersion

applications are available and

are ordered separately, if

required.

All Series A19 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

When provided, follow the

equipment manufacturer’s

instructions. If instructions are

not supplied, follow the

instructions in this sheet.

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.

Mounting

When installing the control, use

the mounting bracket as a

template and mark the location

for the two mounting screws.

Drill or punch two holes and start

the mounting screws. Place the

slot in the bottom of the bracket

under the head of the lower

mounting screw. Position the

control so the top screw is in the

top slot. Tighten both screws. It

is not necessary to level the

control except for appearance.

For closed tank applications

without a bulb well, use the

FTG13A-600R packing nut.

(See Fig. 2.) Put parts over the

support tube section of the

element and place the bulb in

the tank. Install the 1/2 in. NPT

adapter in the tank opening and

tighten. Screw the packing nut

with the retaining washers and

packing into the adapter as

shown in Fig. 2.

CAUTION: Turn Off the

liquid supply and relieve the

pressure before installing or

removing the bulb or bulb

well.

For applications requiring a bulb

well, install the bulb well in the

tank opening. Remove the

bushing from the bulb well and

slide the bushing over the

capillary. Insert the bulb into the

bulb well and replace the

bushing. Push the bulb into

position in the bottom of the well.

Tighten the set screw in the

adapter end to hold the bulb in

position.

Fig. 1 -- A19ZBC Temperature

Control. Note the mounting

bracket on the back of the case.

2 A19ZBC Technical Bulletin

Wiring

WARNING: Disconnect the

power supply before wiring

connections are made to

avoid possible electrical

shock or damage to the

equipment.

Make all wiring connections

using copper conductors only,

and in accordance with the

National Electrical Code and

local regulations. See Fig. 4 for

terminal identifications and

contact action.

Note: Use the terminal screws

furnished (8-32 x 1/4 in. binder

head). Substitution of other

screws may cause problems in

making proper connections.

Adjustments (See Fig. 5)

Set the cut-in point by turning

knob “A” to the desired setting.

Rotate pointer “B” to the desired

cutout setting (differential

adjustment).

Checkout Procedure

Before leaving the installation,

observe at least three complete

operating cycles to be sure that

all components are functioning

correctly.

Repairs and Replacement

Field repairs must not be made.

For a replacement control,

contact the nearest Johnson

Controls distributor.

Controls Group

507 E. Michigan Street

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

Milwaukee, WI 53202

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