Fujitsu 18RLX Reference manual

Production: All CassettesMODEL :18/24/36/42RLX Systems

Duct Fan ControlSOLUTION

Fresh Air Intake w/ Compressor Operation OnlyPROBLEM

SERVICE BULLETIN

Number: 0006

Date: 9/22/09 Rev2

Type: Field

FUJITSU GENERAL AMERICA, INC

353 Route West. Fairfield, NJ 07004

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

Em: [email protected]

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

Duct fan booster

Compressor

N.O.

24V DC

115V AC

IPM

Current Sensor

Built in Relay

N.O.

4. Components utilized

Current sensor with built-in relay specifications:

Split Core Fixed Threshold Current Status Sensor with Command Relay and

Switching Power Supply.

FGAI Fresh Air Kit Part # KHRS940-25

5. Recommended Fan size.

Duct and Fan are field supply. A fan capable of generating 15 CFM at a

static pressure of approximately .26 inches W.C.

Wiring

•Recommended wire size- 14 AWG.

10A Fuse

(Field Supply)

• Install the current sensor around one of the compressor line voltage

wires.

• Tuck sensor into the clearance behind the compressor wire molex

plug.

• Secure the current sensor with a zip tie.

Current Sensor Installation

• 4 zip ties are needed for correct installation.

• Secure the current sensor wires with all four zip ties according to the

arrows. Do not tie around any of the copper lines.

•Cut the ends of the zip ties.

Secure Current Sensor

15 CFM

58.8 Pa

.24 in W.C.

CASSETTE

2.75” x 4”

Field Supplied

Transition

Fan

4” Duct

Outside (Fresh)

Air Intake

Fan Static Pressure Requirements:

Static pressure required at Cassette = .24 in W.C.

25 ft. 4” duct + intake=45ft. TEL x .04/100 = .018 in W.C.

TOTAL =.258 in W.C.

Fan Selection:

Select fan to deliver 15 CFM @ approximately .26 in W.C.

Static pressure requirements will vary with duct length and

inlet conditions.

NOTE: Filter for outside air required. Add filter static pressure loss to static

pressure requirements above.

CEILING CASSETTE

OUTSIDE (FRESH) AIR INTAKE

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