Johnson Controls A19ZBA User manual

FANs 121, 125

Temperature Controls Section A

Technical Bulletin A19ZBA

Issue Date 1291

Code No. LIT-121065

Part No. 997-778

A19ZBA Type Temperature Control

Application

The A19ZBA temperature control

is designed for water chiller

applications. The control has a

range of 38 to 80°F (3 to 27°C)

with contacts that open on a

temperature drop.

A packing nut assembly, Part

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

supplied with the control for

immersion applications where a

bulb well is not required. Bulb

well No. WEL14A-600R (Fig. 3)

for immersion applications is

available, 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 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.

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.

Fig. 1 -- A19ZBA-1 Temperature

Control. Note the mounting

bracket on the back of the case.

Note: Use the terminal screws

furnished (8-32 ×1/4 in. binder

head). Substitution of other

screws may cause problems in

making proper connections.

2 A19ZBA Technical Bulletin

Adjustments (See Fig. 4)

The A19ZBA control has a

locked low cutout stop. Pointer

"B" is locked in place with a

screw that requires a special

spanner wrench, Part No.

836-61, to change the setting.

The special wrench is supplied

with each control. To change

the low cutout stop setting,

proceed as follows:

1. Loosen screw "C" with the

special wrench.

2. Slide pointer arm "B" to the

desired cutout setting

(adjustable from

approximately 38 to 48°F

[3 to 9°C]). The cutout

setting is indicated by the

flat of arm "B."

3. Tighten screw "C."

The cut-in temperature is set by

moving knob "A" to the desired

cut-in setting. This knob

adjustment does not change the

cutout setting, but provides for a

short or long recycle time as

required by the application.

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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