Electrical Service; Air Cooled Condensers - Model Darc; Fan Speed Control; Ambient Thermostats - Data Aire LCS Installation, Operation And Maintenance Manual

Noise factors should be also considered
when locating an air cooled heat
exchanger. Proximity to windows, walls,
and surrounding structures can cause
objections by the occupants. An acoustical
expert should be consulted when noise is
of a particular concern.
Air cooled heat exchangers should be
placed at a level that is higher than the
indoor evaporator. Mounting the remote
heat exchanger (condenser or condensing
unit) more than 10 feet below the evaporator
is not recommended. Excessive liquid line
pressure drop can cause poor evaporator
performance.
Piping must be supported within 18 inches
of the inlet and outlet connections. The
inlet connection is located on the top
header on all remote heat exchangers and the outlet connection is located on the bottom header of
all units.
Air cooled condensers should be placed at a level that is above the level of the indoor evaporator.
Mounting a condenser or condensing unit more than ten feet below the evaporator is not recommended.
Excessive liquid line pressure drop can cause poor evaporator performance.
4.4

Electrical Service

Refer to Sections 3.1 to 3.5 for information regarding line voltage and control voltage wiring
details.
4.5

Air Cooled Condensers - Model DARC

4.5.1 Fan Speed Control

Standard outdoor air cooled condensers have a fan speed controller on the fi rst fan. On single-
fan condensers this is the only means of control. A variable speed controller modulates the motor
speed based on system head pressure. The fan speed controller will normally not require fi eld
adjustment.

4.5.2 Ambient Thermostats

Additional motors (subsequent to the fan speed control operated motor) on multi-fan condensers
are cycled by ambient-sensing thermostats. These thermostats have a capillary tube with a remote
sensing bulb. They will function best if the sensing bulbs are mounted below the coil, away from
exposure to direct sunlight, with the bulb in a vertical position. An instruction set comes as part of a
mounting kit that includes a sheet metal bracket, mounting clamp(s) and TEK screws. This includes
directions for fi eld mounting and adjusting the thermostat bulbs. Desired head pressure should be
maintained at approximately 250 psi.
18