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July 19, 2004
6F-Fan Unit
A 6F-fan unit is mounted at the top of the electronics compartment to circulate air through the equipment to minimize
critical component temperatures. The motors of the fan units remain on at all times, which improves the life of the
electronics by minimizing stress due to thermal cycling. This also ensures good thermal coupling between the field
cabinet air and the circuit packs, preventing the occurrence of hot spots. Moving the heat from the equipment to the
field cabinet air allows the field cabinet to dissipate it to the outside environment.
In the PG-FlexPlus field cabinet, the 6F-fan unit pulls internal field cabinet air upward through the electronic
equipment and exhausts the air into the top plenum. This air then enters and travels down the front duct, exiting at
the bottom. The cooled air exiting at the bottom of the duct re-enters the equipment stack at the bottom of the rack.
This field cabinet is equipped with a door-mounted heat exchanger. Heat exchanger fans draw outside air through
the battery compartment and blows it through the outside heat exchanger plenum, exhausting the warm air through
louvers at the top of the door. The high velocity air in the heat exchanger plenum considerably increases the amount
of heat eliminated from the field cabinet.
Heat Exchangers
A convoluted-core heat exchanger (highest performing heat exchanger offered by CommScope) is provided with the
PG-FlexPlus field cabinet.
The heat exchanger is located on the PG-FlexPlus field cabinet's front door. Two environmentally protected fans are
included with this heat exchanger. These fans are environmentally protected to provide long life in corrosive
environments.
The fans draw outside air through louvers at the bottom of the front door and exhaust the air into the heat exchanger
plenum. The warmed air then exits through vents at the top of the door on the outside of the field cabinet. A small
amount of air from the HX intake is vented into the battery compartment which exits through the vents on the left-
side of the battery compartment. Equipment heat is brought into the heat exchanger for cooling by the 6F-fan unit
mounted at the top the equipment rack.
The two heat exchanger fans on each door are controlled by two separate thermostats. The low-temperature
thermostat ensures that heat exchanger fans are off at very cold ambient temperatures, which maximizes the night-
time cooling of batteries. The high-temperature thermostat operates the fans only when the equipment compartment
is hot which allows the field cabinet to run quieter at night, though night-time battery cooling is sacrificed.
Thermostat set points are listed in
Thermostat
ADC Telecommunications, Inc.
Table
3.
Table 3. Thermostat Temperature Set Points
Monitored
Type
Temperature
Low
Battery
Compartment
High
Equipment
Compartment
Turn ON
Turn OFF
(±5°F) (±3°C)
(±5°F) (±3°C)
55°F (13°C)
37°F (3°C)
131°F (55°C)
117°F (47°C)
SCP-PGCAB001-010-01H
5
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