Johnson Controls R45 Series Technical Bulletin

Brand: Johnson Controls

Model: R45 Series

Type: Technical Bulletin

FANs 121, 125

Relays and Contactors Section R

Technical Bulletin R45

Issue Date 0882

Part No. 24-4229-5, Rev. —

Code No. LIT-121565

R45 Series

Electronic Interface

Application

These electronic interfaces are

for installations where a mixture

of Johnson Controls

CYBERTRONIC

and R41 or

R48 economizer equipment is

required.

Features

•

provides flexibility

•

adds new capability

•

easy to wire and install

•

simple to adjust

General Description

The R45AA and R45AB interfaces

allow the economizer control

signal to control one or more

CYBERTRONIC controlled

devices.

They convert the R41 or R48

economizer's +2 to +18 V.D.C.

signal into the 0 to -16 V.D.C.

signal needed to operate the

CYBERTRONIC products.

The R45GA and R45GB

interfaces allow the

CYBERTRONIC control signal to

control one or more economizer

devices. They convert the

CYBERTRONIC 0 to -16 V.D.C.

signal into the +2 to +18 V.D.C.

signal needed to operate

economizer products.

The electronic interfaces also

match the impedances to the

two product lines.

Installation

These interfaces have two holes

for mounting in a standard 2 in. x

4 in. switch box. Prior to final

mounting, the calibration

procedure should be performed.

Fig. 1 -- R45 Electronic Interface.

They mount with transformer,

adjustment potentiometer, and

wire leads inside the switch box.

An insulating shield covers the

board to prevent shorting when

the cover is screwed down on

the box. (See Fig. 2.)

Wiring

CAUTION: Disconnect

power supply before wiring

and mounting connections

are made to prevent

electrical shock and

possible damage to the

equipment.

All wiring must be in accordance

with local regulations and

Electrical Codes.

The interfaces are supplied with

color coded wire leads. See

Figs. 3 and 4 for wiring

diagrams.

Specifications

2 R45 Technical Bulletin

All connections should be made

using No. 18 AWG wire. The

connections should be made

within the switch box with wire

nuts or solder and tape.

Recheck connections before

applying power to the interface.

Calibration Procedure

The R45A( ) Economizer to

CYBERTRONIC Interface

1. Connect the

CYBERTRONIC load or a

1000 ohm resistor across

the Red (+) and Blue (-)

output leads.

2. Connect appropriate supply

voltage.

3. Apply 2 V.D.C. to the

White/Red (+) and

White/Blue (-) input leads.

4. Adjust the zero

potentiometer until

0.01 V.D.C. is read across

the output leads. Slowly

decrease the zero

potentiometer until

0.05 V.D.C. is just read.

5. Increase the input voltage to

18 V.D.C.

6. Adjust the span

potentiometer for an output

reading of -16 V.D.C.

7. Repeat Steps 3 through 6 to

achieve precise calibration.

The R45G( ) CYBERTRONIC to

Economizer Interface

1. Connect the economizer

load or a 10 k ohm resistor

across the Red (+) and Blue

(-) output leads.

2. Connect appropriate supply

voltage.

3. Apply zero V.D.C. to the

White/Red (+) and

White/Blue (-) input leads.

4. Adjust the zero

potentiometer until the

+2 V.D.C. is read across the

output leads.

5. Apply -16 V.D.C. to the

input.

6. Adjust the span

potentiometer for an output

reading of +18 V.D.C.

7. Repeat Steps 3 through 6 to

achieve precise calibration.

Checkout Procedure

Before leaving the installation,

several complete operating

cycles of the system should be

observed to see that all

components are functioning

properly.

Repairs and Replacement

Field repairs must not be made.

For a replacement interface,

contact the nearest Johnson

Controls Commercial Systems

wholesaler.

Ordering Information

To order, specify Complete

Product Number.

Performance specifications

appearing herein are nominal

and are subject to accepted

manufacturing tolerances and

application variables.

Controls Group

507 E. Michigan Street

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

Milwaukee, WI 53202

Johnson Controls R45 Series Technical Bulletin

Johnson Controls R45 Series Technical Bulletin

Johnson Controls R45 Series Technical Bulletin

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