Bard QERV2-A4B, QERV-A4B User Manual

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
Bryan, Ohio 43506

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

Manual: 2100-310D
Supersedes: 2100-310C
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

Energy Recovery Ventilator

Electrical
A - 230/208 volt

QH Series Cabinet Size
4 - QH241, 301, 361, 421,
481, 601

Modification Code

ELECTRICAL SPECIFICATIONS

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VREQ802/0322.2V42

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.

htiWesUroF

ledoM

VREQ

lortnoC

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CONTROL REQUIREMENTS

B-,A-42HQ
B-,A-03HQ
B-,A-63HQ
B-,A-24HQ
B-,A-84HQ
B-,A-06HQ

C-42HQ
C-03HQ
C-63HQ
C-24HQ
C-84HQ
C-06HQ

stinUgniwolloFlacirtcelE

802/032

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064

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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.

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.

IMPORTANT

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

Manual 2100-310D
Page 1