General Description - NOT model specificEnergy Recovery Ventilator with Heating and Cooling
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Microprocessor Control
The microprocessor controller is specifically designed
and programmed to optimize the performance of the
unit with supplemental
heating and cooling. This
option ensures that the
outdoor air is conditioned
to the desired discharge
conditions. The controller and accompanying sensors
are factory-mounted, wired and programmed. Default
settings are pre-programmed, but are easily field-
adjustable.
The microprocessor controller can be interfaced with
a Building Management System through LonWorks®,
BACnet®, or ModBus.
Please refer to the Installation, Operation and
Maintenance manual for detailed information.
Unoccupied Recirculation Damper
The unoccupied recirculation option provides a
recirculation damper from the return air intake to the
supply airstream to reduce heating and cooling loads
when less ventilation is required. During the unoccupied
mode, the exhaust fan will remain off and the supply
air fan will operate with mode of tempering to maintain
unoccupied temperature set point.
Service Outlet
120 VAC GFCI service outlet ships loose for field
installation. Requires separate power source so power
is available when unit main disconnect is turned off for
servicing.
Vapor Tight Lights
Vapor tight lights provide light to each of the
compartments in the energy recovery unit. The lights
are wired to a junction box mounted on the outside of
the unit. The switch to turn the lights on is located in
the unit control center. The switch requires a separate
power source to allow for power to the lights when the
unit main disconnect is off for servicing.
Hot Gas Bypass Valve (standard scroll)
On units equipped with hot gas bypass, hot gas
from the compressor is injected into the liquid line of
the evaporator coil after the thermostatic expansion
valve. This process starts to occur when suction gas
temperatures drop below 28°F, which is 32°-34°F coil
surface temperature. Hot gas helps the evaporator coil
from freezing up and the compressor from cycling. The
valve needs to be adjusted to exact specifications once
unit is installed in the field.
Hot Gas Reheat Valve
Units equipped with a reheat
coil use a three-way valve with
actuator to control the supply air
discharge temperature of the unit
during dehumidification mode.
The unit controller provides a
0-10VDC signal to control the
amount of reheat to meet the supply
temperature set point.
Controls by Others
The reheat coil needs to be purged to ensure adequate
oil return. It is recommended that every six hours of
reheat compressor run time should initiate a six minute
purge cycle. During the purge cycle, the reheat valve
should be modulated to 100% open to the reheat coil.
Optional Component Overview
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