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FUJITSU GENERAL AMERICA, INC
353 Route West. Fairfield, NJ 07004
Ph: 973-575-0381 Fx: 973-836-0449
Em: ServiceHVAC@fujitsugeneral.com
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.
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
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Summary of Contents for Fujitsu 18RLX
- Page 1 FUJITSU GENERAL AMERICA, INC SERVICE BULLETIN 353 Route West. Fairfield, NJ 07004 Number: 0006 Ph: 973-575-0381 Fx: 973-836-0449 Date: 9/22/09 Rev2 Em: ServiceHVAC@fujitsugeneral.com Type: Field PROBLEM Fresh Air Intake w/ Compressor Operation Only SOLUTION Duct Fan Control MODEL :18/24/36/42RLX Systems Production: All Cassettes 1.
- Page 2 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.
- Page 3 Current Sensor Installation • 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.
- Page 4 Secure Current Sensor • 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.
- Page 5 CEILING CASSETTE OUTSIDE (FRESH) AIR INTAKE 58.8 Pa .24 in W.C. 15 CFM 4” Duct Outside (Fresh) CASSETTE Air Intake 2.75” x 4” Field Supplied Transition 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.