CyberOne EC CW IOM Manual
4
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.
1.4.2
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.
1.4.3
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.
1.4.4
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:
a.
Locked rotor
1
b.
Loss of a phase
1
c.
Low main supply voltage
2
d.
Over-heating of electronics
2
e.
Over-heating of motor
2
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.
1.4.5
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 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 your unit for details specific to your
system.
1.5
Optional Equipment
1.5.1
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.
1.5.1.1
Electric Reheat
For this option, electric resistance heating elements are
factory installed.
1.5.1.2
Hot Water Re-heat
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.
1.5.2
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.
1.5.3
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 E²
system controller of the alarm condition.
