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ELECTRONIC MODULE SYSTEM
MANAGEMENT AND PROTECTION
The ColdMachine is designed for nominal 12 volt DC operating. The
normal operating range is 10.0 volts —15.0 volts. The electronic module
will automatically shut off the system if voltage at the module input
terminal falls below 10.0 volts. As the battery recharges, the electronic
module will automatically turn the system on when the voltage reaches
11.1 volts. This circuity protects the battery from the damaging effects of
a complete discharge and also protects the ColdMachine from chronic
low voltage operation.
MANAGEMENT FUNCTIONS INCLUDE:
• High and low voltage protection (10.0 V DC to 17.0 V DC ) (*) NOTE
• Reverse polarity protections (compressor will not operate)
• High temperature cutout if electronic unit is overheated
• Overload protection if compressor is dangerously overloaded (by
overcharging or extreme high temperature)
• Automatic start abort if the compressor motor cannot rotate
• Battery protection: Low voltage cut out prevents total battery discharge
or drain
• Fan relay circuit protection (0.5 amp max; overcurrent will cause
system to shut down)
• LED diagnostics
(*) NOTE:
If voltage reaches 17.0 V DC, the module "thinks" it is a 24 V
DC system suffering from low voltage, and LED will display one flash. The
module will probably survive. The fan(s) and pump (optional) may not.
WAECO USA, Inc.
26
Tel. (860) 664-4911 • Fax. (860) 664-4912 • www.waecousa.com
OPERATIONAL ERRORS INDICATED BY THE
FLASHING LED ON THE CONDENSING UNIT
If the electronic module "senses" a malfunction, it will auto-
matically switch into its protective mode and will make
repeated start attempts at about 1 minute intervals.
(1) FLASH
Low Voltage Supply. If the supply voltage measured at the
upper (-) and (+) terminals of the electronic module drops
below 10.0 V DC, the system will shut down. It will not restart
until 11.1 V DC is maintained throughout the momentary high-
current start attempt.
(2) FLASHES
Relay Coil Circuit Overload. The relay coil and/or its wiring is
shorted. The electronic module shuts off the output current that
drives the coil. The fan(s) and water pump (optional) will not
operate. (*)
(3) FLASHES
Compressor Motor Starting Problem. The motor rotor (arma-
ture) is mechanically blocked or stuck or the differential pres-
sure inside the compressor is too high and the motor cannot
start.
(4) FLASHES
Under-speed Compressor Motor Problem. If the compressor
cannot reach or maintain its minimum speed of 1800 RPM (due
to poor condenser air flow, overcharge, air in the system,
extremely hot ambient temperature), it will automatically shut
down.
(5) FLASHES
Electronic Overload. The electronic module is overheated
and/or the system has been heavily overloaded (by very high
ambients, fan and/or pump failure, air in the refrigerant circuit,
and/or refrigerant overcharge.
If the system displays any unusual symptoms, runs continuous-
ly or does not cool properly, please refer to the Trouble shoot-
ing guide.
(*) NOTE: Do not operate the system longer than 10 minutes
without the fan running.
For further assistance, please contact
WAECO USA'S
TECHNICAL ASSISTANCE DEPARTMENT
Monday through Friday
8am to 5pm EST
Tel: (860) 664-4911
Fax: (860) 664-4912
Contents, specifications and availability are subject to change without notice.
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