Fujitsu 36RLX Service-Bulletin

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FUJITSU GENERAL AMERICA, INC

353 Route West. Fairfield, NJ 07004

Ph: 973-575-0381 Fx: 973-836-0449

PROBLEM

Fresh Air Intake w/ Compressor Operation Only

SOLUTION

Duct Fan Control

MODEL :18/24/36/42RLX Systems

1. Outline

The circuit shown below provides a cost effective solution for wiring a current switch

that monitors the compressor operation ON/OFF status and energizes the coil of a

relay which in turn close the contacts and provide line voltage to the duct fan. The

duct fan is required to introduce fresh (outside) air for ventilation.

2. Application

A third party current sensor switch with a built-in relay was

used in this application. The current sensor may be

installed around one of the compressor line voltage wires (Red,

Black or White).

3. Wiring diagram

Production: All Cassettes

IPM

Current Sensor

N.O.

24V DC

N.O.

Built in Relay

115V AC

SERVICE BULLETIN

Number: 0006

Date: 9/22/09 Rev2

Type: Field

Compressor

Duct fan booster