Introduction
10
SS-SVX002B-EN
Internal Layout - Down-flow Model
The following figure depicts a sample internal layout of a
TR-CFD (down-flow) unit and identifies the major
components. The location of major components vary
depending on model number and options purchased.
Figure 5.
Typical Internal Layout- Down-flow
STEAM
DISTRIBUTER
ELECTRIC BOX
HUMIDIFIER
COMPRESSORS
REFRIGERANT PIPING
CONDENSATE PUMP
(LOCATION MAY VARY)
ELECTRIC REHEAT
ELEMENTS
(BEHIND EC FANS)
EC FANS
MANUAL RESET
OVERHEAT SWITCHES
COILS
AIR FILTERS
Note: Front View - Door and Access Panels Removed
Electric Box Access
The electrical components are protected in an enclosure
located inside the cabinet behind the hinged access door
with the controller display panel. The front access door is
safety interlocked with the main power service disconnect
switch, preventing the door from being opened when the
switch is in the On position. The main power service
disconnect switch must be turned Off to gain access to the
components within the electric box. The handle of the
switch may be locked in the “Off” position to prevent
unintended operation.
WARNING
Hazardous Voltage and Rotating
Components!
Failure to follow instructions below could result in
death or serious injury.
During installation, testing, servicing and
troubleshooting of this product it may be necessary to
work with live and exposed rotating and electrical
components. Have a qualified or licensed service
individual who has been properly trained in handling
exposed rotating and electrical components perform
these tasks.
Circuit Breakers/Motor Start Protectors
CyberAir units incorporate state of the art component
protection with the use of motor start protectors and
circuit breakers. If an overload occurs the switches must
be manually re-set after the overload condition is cleared.
Compressors
Two scroll compressor circuits are utilized in DX based
CyberAir systems. With fewer moving parts, scroll
compressors have demonstrated superior durability. The
scroll compressor is designed around two identical spirals
or scrolls that, when inserted together, form crescent
shaped pockets. During a compression cycle, one scroll
remains stationary while the other scroll orbits around the
first. As this motion occurs, gas is drawn into the scrolls
and moved in increasingly smaller pockets toward the
center. At this point the gas, now compressed to a high
pressure, is discharged from a port in the center if the fixed
scroll. During each orbit, several pockets of gas are
compressed simultaneously, creating smooth, nearly
continuous compression.
Electronic Expansion Valve
The system controller manages the operation of the
electronic expansion valve (EEV) for each refrigeration
circuit. The controller manages the EEV based on input
signals from the suction pressure and temperature
sensors. It regulates the amount of refrigerant entering the
evaporator to maintain the correct superheat temperature.
Coils
The evaporator coils are aluminum finned/copper tube
construction. The coils are leak tested prior to installation
