Greenheck ERT User Manual

REMOTE PANELS

Two Position

• Unit On/Off: Controls start and stop of the entire
unit.

Three Position

• Hand/Off/Automatic: Three way switch operates
as an override to allow the unit to be turned on,
off, or operated automatically by the building
controls.

Time Delay
Override

The time delay override
is used in conjunction
with the 7-day time
clock. This option allows
the operator to override
the 7-day time clock
when it has turned the
ERV off. The override
period is manually set
for up to two hours.

Greenheck remote panels offer a convenient and attractive option for controlling and monitoring energy
recovery ventilators. A variety of indicator lights, switches and time devices are available to be mounted to a
stainless steel face plate.

Field wiring is only required from the remote panel to a low voltage terminal strip in the control center of the
energy recovery ventilator. A junction box is included with the remote panel.

Two of the many
remote panel
configurations
are shown.
Customize your
remote panel
with the options
listed below.

Lights

• Dirty Supply Filter

• Dirty Exhaust Filter

• Unit On/Off

• Economizer *: Indicates when “free cooling”
conditions are present.

• Rotation Sensor: Indicates when the energy wheel
is not rotating.

• Frost Control **: Indicates when frost control is
activated.

Switches

Time Devices

7-Day Time Clock

A programmable digital
7-day time clock
automates start/stop
control of the energy
recovery ventilators. It
is easily programmed
to energize the ERV
when the space is
occupied and shut
down the unit when the
space is unoccupied.

* Refer to the ERV catalog for details on the outdoor
air sensors to be used in conjunction with the
economizer indicator light. An enthalpy sensor or
temperature sensor must be selected with the
economizer indicator light.

** Consult the ERV catalog for details on preheat,
timed exhaust, and modulating frost control options.

Ventilation Control Options

Greenheck offers two methods of controlling the
ventilation rates. Each method controls outdoor
air and exhaust air fans simultaneously.

• Set Point Control

The CO2sensor controls high and low speeds
(1/2 or 1/3 reduction) via inputs to factory
installed and programmed variable frequency
drive (VFD). When the CO2levels in the space are
below the field adjustable set point, the VFDs will
switch to low speed. When the CO2levels in the
space are above the set point, the VFDs will
switch to high speed.

• Proportional Control

Using a 0-10V signal, the CO2sensor modulates
VFDs that continuously vary the speed of the
supply and exhaust fans. Outdoor air volumes are
controlled to maintain CO2levels within the
desired range.

Demand Control Ventilation

Demand control ventilation practices may be desirable for applications with widely varying outdoor air
requirements such as, auditoriums, theaters and gymnasiums. The ventilation system must be sized for the
maximum occupancy, however, there may be a considerable number of operating hours when less outdoor air
is required.

In these cases, the Greenheck demand control ventilation option is a simple, reliable and cost effective
solution that helps reduce energy bills and provides a better indoor climate.

CO2 Sensor

The heart of the demand
control ventilation
system is a CO2sensor
which monitors the
carbon dioxide levels in
the building. The sensor
may be factory installed
in the exhaust air stream
or shipped loose for field
mounting in the
occupied space.

The sensor displays the
CO2 content in parts per
million. The CO2setpoint
is field adjustable.

As a result of our commitment to continuous improvement, Greenheck reserves the right to change specifications without notice.

DEMAND CONTROL

Greenheck P.O.Box 410 • Schofield, WI 54476-0410 • Phone [phone] • greenheck.com

Copyright © 2005 Greenheck Fan Corp. • Remote Control Panels RG Rev. 3 May 2005

Model APEX

The Model APEX is designed
for energy recovery
applications requiring up to
20,000 cfm. Supplemental
heating and cooling is
available.

MiniVent

The MiniVent energy recovery
ventilator is designed for
applications requiring 300-750
cfm. The unit is designed for
floor mount, wall mount or
hanging from the ceiling.

Model ERT

Combines the benefits of
the energy wheel and a
wrap around heatpipe with
supplemental heating and
cooling

.

Additional Energy Recovery Products offered by Greenheck