Bard QERV2-A4B, QERV-A4B manual Model Nomenclature, Electrical Specifications, General Description

MODEL NOMENCLATURE

Q ERV - A 4 B

Q - QH Series Modification Code

Energy Recovery Ventilator

QH Series Cabinet Size

4 - QH241, 301, 361, 421,

481, 601

Electrical

A - 230/208 volt

ELECTRICAL SPECIFICATIONS

			Control
Model	Voltage	Amps	Voltage
QERV	230 / 208	2.2	24V

GENERAL DESCRIPTION

The Energy Recovery Ventilator was designed to provide energy efficient, cost effective ventilation to meet I. A. Q. (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, beauty salons and others. It provides a constant supply of fresh air for control of airborne pollutants including CO2, smoke radon, formaldehyde, excess moisture, virus and bacteria.

The ventilator incorporates patented rotary heat exchange state-of-the-art technology to remove both heat and moisture.

It is designed as a single package which is factory installed. The package consists of a unique rotary Energy Recovery Cassette that can be easily removed for cleaning or maintenance. It has two 15 inch diameter heat transfer wheels for efficient heat transfer. The heat transfer wheels use a permanently bonded dry desiccant coating for total heat recovery.

Ventilation is accomplished with 2 blower/motor assemblies each consisting of a drive motor and dual blowers for maximum ventilation at low sound levels. Air is exhausted at the same rate that fresh air is brought into the structure thus not pressuring the building. The rotating energy wheels provide the heat transfer effectively during both summer and winter conditions. Provides required ventilation to meet the requirements of ASHRAE 62-2001 standard.

NOTE: Operation is not recommended below 5°F outdoor temperature because freezing of moisture in the heat transfer wheel can occur.

	For Use With
Model	Following Units	Electrical
	QH24-A, -B
	QH30-A, -B
	QH36-A, -B	230/208
	QH42-A, -B	1 or 3 Phase
	QH48-A, -B
QERV	QH60-A, -B
	QH24-C
	QH30-C
	QH36-C	460
	QH42-C	3 Phase
	QH48-C
	QH60-C

CONTROL REQUIREMENTS

1.Indoor blower motor must be run when ever the QERV is run.

2.Select the correct motor speed on the QERV. Using Table 1 of the QERV Installation Instructions determine the motor speed needed to get the desired amount of ventilation air needed. For instance, do not use the high speed tap on a QERV if only 200 CFM of ventilation air is needed. Use the low speed tap. Using the high speed tap would serve no useful purpose and would effect the overall efficiency of the air conditioning system. System operation costs would also increase.

3.Run the QERV only during periods when the conditioned space is occupied. Running the QERV during unoccupied periods wastes energy, decreases the expected life of the QERV, and can result in a large moisture buildup in the structure. The QERV removes 60 to 70% of the moisture in the incoming air, not 100% of it. Running the QERV 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 on occupancy.

IMPORTANT

Operating the QERV during unoccupied periods can result in a build up of moisture in the classroom.

Manual 2100-310D Page 1