Bard QERV-A4B, QERV2-A4B User Manual

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OPERATION INSTRUCTIONS

ENERGY RECOVERY VENTILATOR

WITH EXHAUST

Model: QERV-A4B

QERV2-A4B

For Use With Bard

2 Through 5 Ton

QH Series Heat Pumps

BARD MANUFACTURING COMPANY

Manual:

2100-310D

Bryan, Ohio 43506

Supersedes:

2100-310C

Since 1914...Moving ahead, just as planned.

File:

Volume II, Tab 14

Date:

01-10-05

 

 

 

CONTENTS

QERV Model Nomenclature ...................................

1

Electrical Specifications ..........................................

1

General Description of QERV ................................

1

Control Requirements ............................................

1

Recommended Control Sequences .......................

2

Ventilation Air Flow .................................................

2

Performance and Application Data ....................

3 - 4

Energy Recovery Ventilator Maintenance ..............

4

Maintenance Procedures .......................................

5

Figures

 

 

Figure 1

Belt Replacement Instructions .................

6

Figure 2

Hub Assembly with Ball Bearings ............

7

Tables

 

 

Table 1

Ventilation Air (CFM)................................

2

Table 2

Summer Cooling Performance ................

3

Table 3

Winter Heating Performance ...................

4

COPYRIGHT DECEMBER 2003 BARD MANUFACTURING COMPANY BRYAN, OHIO USA 43506

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

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