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I-TEC ENERGY RECOVERY VENTILATOR SYSTEM
GENERAL DESCRIPTION
The I-TEC Energy Recovery Ventilator (ERV) was
designed to provide energy efficient, cost effective
ventilation to meet IAQ (indoor air quality)
requirements while still maintaining good indoor
comfort and humidity control for a variety of
applications such as schools, classrooms, lounges,
conference rooms and others. It provides a constant
supply of fresh air for control of airborne pollutants
including CO
, smoke, radon, formaldehyde, excess
2
moisture, virus and bacteria.
The ERV incorporates patented rotary heat exchanger
technology to remove both heat and moisture. The
package consists of unique rotary Energy Recovery
Cassettes that can be easily removed for cleaning or
maintenance. It has two 15" diameter heat transfer
wheels for efficient heat transfer. The heat transfer
wheels use a permanently bonded dry dessicant coating
for total heat recovery.
The I-TEC ERV is also provided with filters to reduce
the required service needed and to extend the life of
the heat recovery wheels. The exhaust air blower is
protected by disposable filters and the intake air blower
is protected by washable filters. Both are accessible
without the need for tools.
Ventilation is accomplished with two blower/motor
assemblies for maximum ventilation at low sound
levels. The intake and exhaust blowers can be
independently adjusted to maintain desired building
pressurization conditions. The rotating wheels provide
the heat transfer effectively during both summer and
winter conditions. Provides required ventilation to
meet the requirements of ASHRAE 62.1 Standard.
NOTE: During operation below 5°F outdoor temperature,
freezing of moisture in the heat transfer wheel can
occur. Consult the factory if this possibility exists.
The I-TEC ERV can be controlled in different ways.
It can be turned ON/OFF with an occupancy control,
thermostat or CO
control. It can also be configured
2
for fully modulating variable speed with a CO
to only bring in the minimal amount of ventilation
required (helping to minimize sound levels and
ventilation load on the structure).
CONTROL WIRING
The I-TEC ERV comes wired from the factory ready to
operate in manual mode (ON/OFF cycling) and set to
375 CFM of ventilation. Care must be taken when
deciding how to control the operation of the ventilator.
When designing the control circuit for the ventilator,
the following requirements must be met:
1. The indoor blower must be run whenever the I-TEC
ERV is run.
2. Select and configure the correct CFM ventilation
level that the I-TEC ERV needs to operate and
configure the system to this level following later
instructions within this section. Over ventilating
serves no useful purpose and significantly affects
the overall efficiency of the system. System
operating costs would also increase.
3. Run the I-TEC ERV only during periods when
the conditioned space is occupied. Running the
ERV during unoccupied periods wastes energy,
decreases the expected life of the ERV, and can
result in large moisture buildup in the structure.
The ERV removes 60-70% of the moisture in the
incoming air, not 100% of it. Running the ERV
when the structure is unoccupied allows moisture
to build up in the structure because there is little
or no cooling load. Thus, the air conditioner is
not running enough to remove the excess moisture
being brought in. Use a control system that in
some way can control the system based upon
occupancy.
Operating the I-TEC ERV during unoccupied
periods can result in a build up of excess
moisture in the structure.
RECOMMENDED CONTROL SEQUENCES
Several possible scenarios are listed below:
1. Use a programmable electronic thermostat with
auxiliary terminal to control the ERV based on
daily programmed occupance periods. Bard
markets and recommends Bard Part #8403-060
control
programmable electronic thermostat.
2
2. Install a Bard CompleteStat™ with occupancy
sensor which learns room usage and automatically
engages ventilation.
3. Use a DDC control system to control the ERV based
upon a room occupancy schedule to control the
ERV.
4. Tie the operation of the ERV into the light switch.
The lights in a room are usually on only when
occupied.
(VENT CODE "R")
Manual 2100-597G
Page
49 of 68
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