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Additional Product Information
This flush mount ceiling plenum is designed for application in
systems that utilize field fabricated (OEM supplied) cold air
ducting. The ducting must be routed through the ceiling
cavity (between the interior ceiling and roof). Ducting
specifications are given in the section labeled “Supply Ducting
and Registers”.
This system utilizes a single, non-ducted centrally located
return air opening. The return air opening is contained within
the ceiling plenum. The ceiling plenum must be located
directly below the roof opening used for mounting the roof top
unit.
All manual controls have been removed from the ceiling
plenum. They have been replaced with control relays. The
relays are mounted in the electrical box of the ceiling plenum.
The relays contain 12 VDC coils (which are energized by a
wall mounted thermostat), with contacts that control the high
voltage used to power the roof top unit.
All air conditioning functions are controlled by the low
voltage wall mounted thermostat. The thermostat controls a
12 VDC electrical circuit which is used to energize the relays
in the ceiling plenum. The thermostats that Airxcel, Inc.
provides for the system are combination (Heat/Cool)
thermostats. These thermostats are capable of operating both
the roof top air conditioner and any furnace with a 12 VDC
control circuit of 1 amp or less (continuous current).
All air conditioning equipment is subject to freeze up when
evaporator air flow is sufficiently reduced. Ducting of any
length creates potential for reduced evaporator air flow and
system freeze-up. To protect both the installer and Airxcel,
Inc. from conditions that promote reduced air flow and system
freeze-up, Airxcel, Inc. has equipped the ceiling plenum
compressor control circuit with a low temperature probe. The
low temperature probe monitors the temperature of the air
conditioner evaporator coil. When the temperature of the
evaporator coil drops below 28 degrees F, the switch will
open, stopping compressor operation. Compressor operation
will resume once the evaporator warms to 55 degrees F.
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