Bard 357-93-E User Manual download pdf (Page 4)

Form No. S3409-510

Supersedes S3409-1009

Page 4 of 8

Ventilation System Packages

BAROMETRIC FRESH AIR DAMPER - BFAD STANDARD

The barometric fresh air damper is a standard feature on all models. It is installed on the inside of the

service door and allows outside ventilation air, up to 25% of the total airflow rating of the unit, to be

introduced through the air inlet openings and to be mixed with the conditioned air. The damper opens

during blower operation and closes when the blower is off. Adjustable blade stops allow different amounts

of outside air to be introduced into the building and can be easily locked closed if required.

BLANK OFF PLATE - BOP OPTIONAL

A blank off plate is installed on the inside of the service door. It covers the air inlet openings, which

restricts any outside air from entering the unit. The blank off plate should be utilized in applications where

outside air is not required to be mixed with the conditioned air.

MOTORIZED FRESH AIR DAMPER - MFAD OPTIONAL

The motorized fresh air damper is internally mounted behind the service door and allows outside ventilation

air, up to 25% of the total airflow rating of the unit, to be introduced through the air inlet openings and to be

mixed with the conditioned air. The two position damper can be fully opened or closed. The damper blade

is powered open by a 24VAC motor with spring return on power loss. The damper can be controlled by

indoor blower operation or can be field connected to be managed based on building occupancy.

COMMERCIAL ROOM VENTILATOR - CRV OPTIONAL

The built-in commercial room ventilator is internally mounted behind the service door and allows outside

ventilation air, up to 50% of the total airflow rating of the unit, to be introduced through the air inlet

openings. It includes a built-in exhaust air damper.

The commercial room ventilator (CRV) is a simple and innovative approach to improving the indoor air

quality by providing fresh air intake and exhaust capability through the CRV. The damper can be easily

adjusted to control the amount of fresh air supplied into the building. The CRV can be controlled by indoor

blower operation or field controlled based on room occupancy. Two versions are available: the CRVS is

power open - spring return on power loss; the CRVP is power open and power return. Complies with

ANSI/ASHRAE Standard 62.1 “Ventilation for Acceptable Indoor Air Quality.”

ECONOMIZER - EIFM OPTIONAL

The built-in economizer system is internally mounted behind the service door and allows outdoor air to be

introduced through the air inlet openings. The amount of outdoor air varies in response to the system

controls and settings defined by the end user. It includes a built-in exhaust air damper. The economizer

is designed to provide “free cooling” when outside air conditions are cool and dry enough to satisfy cooling

requirements without running the compressor. This in turn provides lower operating costs, while extending

the life of the compressor.

Standard Features:

• One Piece Construction - Easy to install with no mechanical linkage adjustment required.

• Exhaust Air Damper - Built in with positive closed position. Provides exhaust air capability to

prevent pressurization of tight buildings.

• Actuator Motor - 24 volt, power open, spring return with built in torque limiting switch.

• Proportioning Type Control - for maximum “free cooling” economy and comfort.

• Moisture Eliminator & Prefilter - permanent, washable aluminum construction.

• Enthalpy Control - adjustable to monitor outdoor temperature and humidity.

• Minimum Position Potentiometer - adjustable to control minimum damper blade position for

ventilation purposes.

• Mixed Air Sensor - to monitor outside and return air to automatically modulate damper position.

WALL-MOUNT ENERGY RECOVERY VENTILATOR - ERVF OPTIONAL

The wall-mount energy recovery ventilator is a highly innovative approach to meeting indoor air quality

ventilation requirements as established by ANSI/ASHRAE Standard 62.1. The ERVF allows from 200 to

450 CFM (depending upon model) of fresh air and exhaust through the unit while maintaining superior

indoor comfort and humidity levels. In most cases, this can be accomplished without increasing equipment

sizing or operating costs. Heat transfer efficiency is up to 67% during summer and 75% during winter

conditions.

The ERVF consists of a unique “rotary energy recovery cassette” that provides effective sensible and

latent heat transfer capabilities during summer and winter conditions. Various control schemes are

addressed - including limiting ventilation during building occupancy only.

The ERVF is designed to be internally mounted behind the service door in the W70A or W70L model wall

mount units. It can be built-in at the factory or field installed as an option. ERVF-*5C can be independently

adjusted for intake and exhaust rates.

Bard Wall-Mounts are designed to provide optional ventilation packages to meet all of your ventilation and indoor air quality requirements.

All units are equipped with a barometric fresh air damper as the standard ventilation package. All ventilation packages can be built-in at the factory,

or field-installed at a later date.

Motorized Fresh Air Damper

Barometric Fresh Air Damper

Commercial Room Ventilator

Economizer

Energy Recovery Ventilator

NOTE: The above vent systems are intake only without built-in exhaust capability. Building will likely require separate field

installed barometric relief or mechanical exhaust elsewhere within the conditioned space. Balancing dampers in the return air

grille may be required to achieve specified amount of outdoor air intake.

Manufactured under U.S. Patent Nos. 5,485,878; 5,301,744; 5,002,116.

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Bard 357-93-E User Manual Page 4

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