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Introduction
The service disconnect switch may be used to turn the unit
off for emergency shutdown or when routine maintenance
is performed. The handle of the switch may be tagged/
locked in the "Off" position to prevent unintended
operation.
Note: Electric box components are labeled with reference
designators. See the unit electrical drawing
provided in the data package to identify the
components.
Circuit Breakers/Motor Start Protectors
CyberOne EC CW systems incorporate state of the art
component protection with the use of motor start
protectors and circuit breakers located in the electric box.
If an overload occurs, the switches must be manually re-
set after the overload condition is cleared.
Coil(s)
Cooling and optional hot water re-heating coils are
aluminum finned/copper tube construction. The coils are
leak tested and cleaned before installation by the factory.
EC Fan
The unit is equipped with a high efficiency, electronically
commutated (EC) fan. EC fans have a brushless motor
equipped with permanent magnets and permanently
lubricated ball bearings. The fan impellers are backward
curved and attached to the rotor casing. The fan is
balanced and aerodynamically optimized to minimize
vibration.
The fan does not use drive belts. Fan speed is variable,
controlled by a 0 to 10 Vdc signal from the system
controller. The fan motor is equipped with integral
electronics and does not require the addition of secondary
electronics such as thermal protection, inverters or filters.
The fan will not produce AC inverter whine.
EC fans feature an integrated monitoring function to
protect the motor and electronics against damage from
jamming, phase loss or overheating. If any of the following
failure conditions occur, the motor automatically stops
and an alarm is signaled:
1
•
Locked rotor
•
Loss of a
phase1
•
Low main supply voltage
•
Over-heating of
electronics2
•
Over-heating of
motor2
Temperature/Humidity Sensor
As a standard for room air control, a temperature/humidity
(T/H) sensor is factory mounted in the return air stream.
The T/H sensor monitors the return air conditions and
provides input signal(s) to the system controller to
1
Upon correction of these failure conditions, the motor will automatically reset.
2
Upon correction of these failure conditions, the motor must be manually reset by turning off power for 20 seconds.
8
2
manage the operation of the A/C unit consistent with the
set points entered in the system controller. As an option,
sensor(s) may be shipped loose for field installation. Refer
to the electrical drawing supplied with the unit for details
specific to the system.
Optional Equipment
Heater
An optional electric or hot water heater may be mounted
in the supply air stream after the cooling coils to reheat
supply air, as may be required to offset the sensible
cooling of the system during the dehumidification cycle,
and for the automatic heating mode.
Electric Reheat
For this option, electric resistance heating elements are
factory installed.
Hot Water Reheat
For this option, hot water heating coil(s) are factory
installed. A 2-way or 3-way modulating valve is provided
to control the flow of hot water through the coils to
maintain the correct re-heat temperature.
Humidifier
CyberOne EC systems are offered with an optional
electrode steam humidifier. The humidifier is factory
installed inside the air conditioner and includes fill and
drain valves and associated piping. Operation of the
humidifier's fill and drain cycles is based on water
conductivity and is maintained by the humidifier
controller. An operating manual for the humidifier is
provided under separate cover. Refer to that manual for
detailed information on operation of the humidifier.
Condensate Pump
An optional factory-installed condensate pump may be
provided. The pump automatically eliminates condensate
and humidifier flush water (if applicable) from the drain
pan. Should an overflow occur, an internal overflow safety
switch will signal the controller of the alarm condition.
Water Detector
Spot type or strip/cable type water detectors shall be
provided. Upon sensing a water leak, the water detector
control circuit will signal the A/C system controller of the
alarm condition.
AH-SVX010C-EN
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