Production: All Cassettes
MODEL :18/24/36/42RLX Systems
Duct Fan Control
SOLUTION
Fresh Air Intake w/ Compressor Operation Only
PROBLEM
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
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.
N.O.
+
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