Table of Contents
Advertisement
Overview
Figure 1.
Typical internal layout- CRS-042/084
PIPE TRANSITION
ELECTRICAL
KNOCK-OUTS
DISCONNECT
SWITCH
EVAPORATOR
COIL
ELECTRIC BOX
SWING-OUT
HINGE
ELECTRICAL
KNOCK-OUTS (IN
BOTTOM OF BOX)
NOTE: CABINET ACCESS PANELS REMOVED TO SHOW INTERNAL PARTS.
Electrical Compartment
The electrical components are protected inside an electric box
located behind the rear access panel. The electric box cover is
safety interlocked with the service disconnect switch (See
Figure
1) preventing the cover from being opened when the
switch in the On position. The switch must be turned Off to gain
access to the electrical compartment.
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 locked in the Off
position to prevent unintended operation.
Circuit Breakers/Motor Start Protectors
CyberRow 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.
Compressor
A scroll compressor is utilized in DX based CyberRow
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
8
PLATE
EC FAN (3)
CONDENSER
(CRS-W and CRS-G
UNITS ONLY)
T/H SENSOR
AIR FILTERS
COMPRESSOR
CASTER
HOUSING (4)
LEVEL
ADJUSTMENT
SCREW (4)
PIPING/ELECTRICAL
KNOCK-OUTS
DRAIN PANS
(IN FLOOR OF CABINET)
FLOAT SWITCH
simultaneously, creating smooth, nearly continuous
compression.
Electronic Thermal Expansion Valve
An auxiliary control module mounted to the door of the electric
box, manages the operation of the electronic expansion valve
(EEV). The control module 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.
Electronic Hot Gas Bypass
Used for freeze protection and capacity control, an
electronically controlled hot gas bypass valve is managed by
the same auxiliary control module that manages the EEV
valve. The hot gas bypass system allows the compressor to
run continuously instead of cycling the compressor on and off
for capacity control. The hot gas bypass system manages
system capacity based on the suction temperature. The hot
gas regulator valve meters hot gas into the evaporator coil
during low load periods or when evaporator air flow is reduced.
Coil(s)
Cooling coils are aluminum finned/copper tube construction.
The coils are leak tested and cleaned before installation by the
factory. Condensate drain pans are provided to collect water
condensed by the coils. The drain pans are emptied by a
condensate pump that directs the water to a pipe stub located
either at the top or the bottom of the A/C unit depending on the
piping configuration (see
A float switch is placed in the lower condensate pan to detect
if the water level rises. If the condensate pan fails to drain, the
Figure 9, p. 14
and
Figure 11, p.
AH-SVX015A-EN
16).
Advertisement
Table of Contents
Troubleshooting
