Optional Controls And Packages - Industrial Climate Engineering ECUA90 Installation & Operation Manual

reset is necessary to prevent harmful short-cycling. To reset switch, turn primary power off, then back
on or turn thermostat system switch off, then back on.
Low Pressure Switch
The low pressure switch is mounted on the compressor suction line. It is designed to open if the refrigerant
pressure drops to 40 PSIG; it resets when the pressure rises to 60 PSIG. The switch protects the unit if
airflow through the indoor blower is impeded, if the blower motor fails, or if there is a loss of refrigerant.
1.7 Optional Controls & Packages
Protective Coating Packages
Two corrosion protection packages are offered- one for the condenser section (the Coastal Environmental
package) and the other for the entire unit (the Coat-All Package).
The condenser protection package includes:
• Corrosion resistant fasteners
• Sealed or partially sealed condenser fan motor
• Two layer epoxy/urethane applied to all exposed internal copper and metal in the in the condenser
section
• An impregnated polyurethane on the condenser coil
The Coat-all package includes all of the above but also includes an impregnated polyurethane on the
evaporator coil and the two layer epoxy/urethane on all exterior and interior components and sheet metal.
(Note: the internal sheet metal which is insulated and the internal control box are not coated).
Three Phase Voltage Monitor
Continuously measures the voltage of each of the three phases. The monitor separately senses low and
high voltage, voltage unbalance including phase loss and phase reversal. A red LED glows to indicate
a fault. When all voltages are acceptable a green LED glows. Automatically resets when voltages and
phases are within operating tolerances. Not required on 1ø units.
Dirty Filter Indicator
A diaphragm type of indicator measures the air pressure on either side of the filter and when the pressure
drops below the set point, a red LED is illuminated. The set point is adjustable.
Protective Coil Coatings
Either the condenser or evaporator coil can be coated. For harsh conditions, e.g., power plants, paper mills
or sites were the unit will be exposed to salt water, the condenser coil should be coated. Note: Cooling
capacity may be reduced by up to 5% on units with coated coils.
POST PURGE
WHEEL
LEDs
8
DELAY ON MAKE
(COMPRESSOR TIME DELAY)
WHEEL
ECU 12/2014 NEW