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

Page 1

RECOMMENDED CONTROL SEQUENCES

Several possible control scenarios are listed below:

1.Use a programmable electronic thermostat with auxiliary terminal to control the QERV based on daily programmed occupancy periods. Bard markets and recommends the White-Rodgers 1F94-80 (Bard Part No. 8403-034), programmable electronic thermostat for heat pump applications.

2.Use a motion sensor in conjunction with a mechanical thermostat to determine occupancy in the classroom. Bard markets the CS2000 for this use.

3.Use a DDC control system to control the QERV based on a room occupancy schedule to control the QERV.

4.Tie the operation of the QERV into the light switch. The lights in a room are usually on only when occupied.

5.Use a manual timer that the occupants turn to energize the QERV for a specific number of hours.

6.Use a programmable mechanical timer to energize the QERV and indoor blower during occupied periods of the day.

VENTILATION AIR FLOW

The QERV is equipped with a 3 speed motor to provide the capability of adjusting the ventilation rates to the requirements of the specific application by simply changing motor speeds.

TABLE 1

VENTILATION AIR (CFM)

 

High Speed

Midium Speed

Low Speed

 

(Black

(Blue)

(Red)

CFM

 

 

 

450

375

300

 

 

 

 

The units are wired from the factory on low speed. The speed can be changed by switching the toggle switch on the front of the QERV to the desired speed.

The QERV2-A4B is equipped with independently controlled 3-speed motor to provide the capability of adjusting the ventilation rates to the requirements of the specific application and to be able to provide positive pressure in the structure. This is accomplished by setting the intake blower on a higher speed than the exhaust blower.

Manual 2100-310D

Page 2

PERFORMANCE AND APPLICATION DATA

TABLE 2

SUMMER COOLING PERFORMANCE (INDOOR DESIGN CONDITIONS 75° DB / 62° WB)

Ambient

VENTILATION RATE – 450 CFM

 

VENTILATION RATE – 375 CFM

 

VENTILATION RATE – 300 CFM

 

O.D.

 

 

 

65% Efficiency

 

 

 

 

 

66% Efficiency

 

 

 

 

 

67% Efficiency

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DB/WB

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DegreesF

VLT

VLS

VLL

HRT

HRS

 

HRL

VLT

VLS

VLL

HRT

HRS

 

HRL

VLT

VLS

VLL

HRT

HRS

 

HRL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

75

21465

14580

6884

13952

9477

 

4475

17887

12150

5737

11805

8018

 

3786

14310

9720

4590

9587

6512

 

3075

105

70

14580

14580

0

9477

9477

 

0

12150

12150

0

8018

8018

 

0

9720

9720

0

6512

6512

 

0

 

65

14580

14580

0

9477

9477

 

0

12150

12150

0

8018

8018

 

0

9720

9720

0

6512

6512

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

80

31590

12150

19440

20533

7897

 

12635

26325

10125

16200

17374

6682

 

10692

21060

8100

12960

14110

5427

 

8683

 

75

21465

12150

9314

13952

7897

 

6054

17887

10125

7762

11805

6682

 

5123

14310

8100

6210

9587

5427

 

4160

100

70

12352

12150

202

8029

7897

 

131

10293

10125

168

6793

6682

 

111

8235

8100

135

5517

5427

 

90

 

65

12150

12150

0

7897

7897

 

0

10125

10125

0

6682

6682

 

0

8100

8100

0

5427

5427

 

0

 

60

12150

12150

0

7897

7897

 

0

10125

10125

0

6682

6682

 

0

8100

8100

0

5427

5427

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

80

31590

9720

21870

20533

6318

 

14215

26325

8100

18225

17374

5345

 

12028

21060

6480

14580

14110

4341

 

9768

 

75

21465

9720

11744

13952

6318

 

7634

17887

8100

9787

11805

5345

 

6459

14310

6480

7830

9587

4341

 

5246

95

70

12352

9720

2632

8029

6318

 

1711

10293

8100

2193

6793

5345

 

1447

8235

6480

1755

5517

4341

 

1175

 

65

9720

9720

0

6318

6318

 

0

8100

8100

0

5345

5345

 

0

6480

6480

0

4341

4341

 

0

 

60

9720

9720

0

6318

6318

 

0

8100

8100

0

5345

5345

 

0

6480

6480

0

4341

4341

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

80

31590

7290

24300

20533

4738

 

15794

26325

6075

20250

17374

4009

 

13365

21060

4860

16200

14110

3256

 

10854

 

75

21465

7290

14175

13952

4738

 

9213

17887

6075

11812

11805

4009

 

7796

14310

4860

9450

9587

3256

 

6331

90

70

12352

7290

5062

8029

4738

 

3290

10293

6075

4218

6793

4009

 

2784

8235

4860

3375

5517

3256

 

2261

 

65

7290

7290

0

4738

4738

 

0

6075

6075

0

4009

4009

 

0

4860

4860

0

3256

3256

 

0

 

60

7290

7290

0

4738

4738

 

0

6075

6075

0

4009

4009

 

0

4860

4860

0

3256

3256

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

80

31590

4860

26730

20533

3159

 

17374

26325

4050

22275

17374

2672

 

14701

21060

3240

17820

14110

2170

 

11939

 

75

21465

4860

16605

13952

3159

 

10793

17887

4050

13837

11805

2672

 

9132

14310

3240

11070

9857

2170

 

7416

85

70

12352

4860

7492

8029

3159

 

4870

10293

4050

6243

6793

2672

 

4120

8235

3240

4995

5517

2170

 

3346

 

65

4860

4860

0

3159

3159

 

0

4050

4050

0

2672

2672

 

0

3240

3240

0

2170

2170

 

0

 

60

4860

4860

0

3159

3159

 

0

4050

4050

0

2672

2672

 

0

3240

3240

0

2170

2170

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

75

21465

2430

19035

13952

1579

 

12372

17887

2025

15862

11805

1336

 

10469

14310

1620

12690

9587

1085

 

8502

80

70

12352

2430

9922

8029

1579

 

6449

10293

2025

8268

6793

1336

 

5457

8235

1620

6615

5517

1085

 

4432

65

4252

2430

1822

2764

1579

 

1184

3543

2025

1518

2338

1336

 

1002

2835

1620

1215

1899

1085

 

814

 

 

 

 

 

60

2430

2430

0

1579

1579

 

0

2025

2025

0

1336

1336

 

0

1620

1620

0

1085

1085

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

70

12352

0

12352

8029

0

 

8029

10293

0

10293

6793

0

 

6793

8235

0

8235

5517

0

 

5517

75

65

4252

0

4252

2764

0

 

2764

3543

0

3543

2338

0

 

2338

2835

0

2835

1899

0

 

1899

 

60

0

0

0

0

0

 

0

0

0

0

0

0

 

0

0

0

0

0

0

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LEGEND

 

 

 

 

VTL

=

Ventilation Load – Total

HRT

=

Heat Recovery – Total

VLS

=

Ventilation Load – Sensible

HRS

=

Heat Recovery – Sensible

VLL

=

Ventilation Load – Latent

HRL

=

Heat Recovery – Latent

Manual 2100-310D

Page 3

TABLE 3

WINTER HEATING PERFORMANCE (INDOOR DESIGN CONDITIONS 70° F DB)

Ambient

 

 

 

 

 

 

 

 

O.D.

 

 

VENTILATION RATE

 

 

 

 

 

 

 

 

 

 

 

 

 

DB

450 CFM 80% Eff.

375 CFM 81% Eff.

300 CFM 802 Eff.

 

 

 

 

 

 

 

 

 

 

Degrees F

WVL

WHR

WVL

WHR

WVL

WHR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

65

2430

1944

2025

1640

1620

1328

 

 

 

 

 

 

 

 

 

 

 

60

4860

3888

4050

3280

3240

2656

 

 

 

 

 

 

 

 

 

 

 

55

7290

5832

6075

4920

4860

3985

 

 

 

 

 

 

 

 

 

 

 

50

9720

7776

8100

6561

6480

5313

 

 

 

 

 

 

 

 

 

 

 

45

12150

9720

10125

8201

8100

6642

 

 

 

 

 

 

 

 

 

 

 

40

14580

11664

12150

9841

9720

7970

 

 

 

 

 

 

 

 

 

 

 

35

17010

13608

14175

11481

11340

9298

 

 

 

 

 

 

 

 

 

 

 

30

19440

15552

16200

13122

12960

10627

 

 

 

 

 

 

 

 

 

 

 

25

21870

17496

18225

14762

14580

11955

LEGEND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

24300

19440

20250

16402

16200

13284

WVL

= Winter Ventilation Load

15

26730

21384

22275

18042

17820

14612

WH

= Winter Heat Recovery

 

 

 

 

 

 

 

 

 

NOTE: Sensible performance only is shown for winter application.

ENERGY RECOVERY VENTILATOR MAINTENANCE

GENERAL INFORMATION

The ability to clean exposed surfaces within air moving systems is an important design consideration for the maintenance of system performance and air quality. The need for periodic cleaning will be a function of operating schedule, climate, and contaminants in the indoor air being exhausted and in the outdoor air being supplied to the building. All components exposed to the airstream, including energy recovery wheels, may require cleaning in most applications.

Rotary counterflow heat exchanges (heat wheels) with laminar airflow are “self-cleaning” with respect to dry particles. Smaller particles pass through; larger particles land on the surface and are blow clear as the flow direction is reversed. For this reason the primary need for cleaning is to remove films of oil based aerosols that have condensed on energy transfer surfaces. Buildup of material over time may eventually reduce airflow. Most importantly, in the case of desiccant coated (enthalpy) wheels, such films can close off micron sized pores at the surface of the desiccant material, reducing the efficiency with which the desiccant can adsorb and desorb moisture.

FREQUENCY

In a reasonably clean indoor environment such as a school, office building, or home, experience shows that reductions of airflow or loss of sensible (temperature) effectiveness may not occur for ten or more years. However, experience also shows that measurable changes in latent energy (water vapor) transfer can occur in shorter periods of time in commercial, institutional and residential applications experiencing moderate occupant smoking or with cooking facilities. In applications experiencing unusually high levels of occupant smoking, such as smoking lounges, nightclubs, bars and restaurants, washing of energy transfer surfaces, as frequently as every six months, may be necessary to maintain latent transfer efficiency. Similar washing cycles may also be appropriate for industrial applications involving the ventilation of high levels of smoke or oil based aerosols such as those found in welding or machining operations, for example. In these applications, latent efficiency losses of as much as 40% or more may develop over a period of one to three years.

Manual 2100-310D

Page 4

CLEANABILITY AND PERFORMANCE

In order to maintain energy recovery ventilation systems, energy transfer surfaces must be accessible for washing to remove oils, grease, tars and dirt that can impede performance or generate odors. Washing of the desiccant surfaces is required to remove contaminate buildups that can reduce adsorption of water molecules. The continued ability of an enthalpy wheel to transfer latent energy depends upon the permanence of the bond between the desiccant and the energy transfer surfaces.

Bard wheels feature silica gel desiccant permanently bonded to the heat exchange surface without adhesives; the desiccant will not be lost in the washing process. Proper cleaning of the Bard energy recovery wheel will restore latent effectiveness to near original performance.

MAINTENANCE PROCEDURES

NOTE: Local conditions can vary and affect the required time between routine maintenance procedures, therefore all sites (or specific units at a site) may not have the same schedule to maintain acceptable performance. The following timetables are recommended and can be altered based on local experience.

QUARTERLY MAINTENANCE

1.Inspect mist eliminator/prefilter and clean if necessary. This filter is located in the wall sleeve and can be accessed by either removing the exterior louver grille, the vent package from inside the unit, or by disconnecting the unit from the wall brackets, and rolling the unit away from the sleeve on its integral wheel system. The filter is an aluminum mesh filter and can be cleaned with water and any detergent not harmful to aluminum.

2.Inspect the comfort air filter and clean or replace as necessary. This filter is located behind the front-hinged service door.

3.Inspect energy recovery ventilator for proper wheel rotation and dirt buildup. This can be done in conjunction with Item 2 above. Energize the energy recovery ventilator after inspecting the filter and observe for proper rotation and/or dirt buildup.

4.Recommended energy recovery wheel cleaning procedures follow: Disconnect all power to the unit. Open the front-hinged service door to the unit.

5.Remove the front cassette retaining panel from the front of the QERV. Unplug the amp connectors to the cassette drive motor. Slide energy recovery cassette out of the ventilator.

6.Use a shop vacuum with brush attachment to clean both sides of the energy recovery wheels.

7.Reverse shop vacuum to use as a blower and blow out any residual dry debris from the wheel.

NOTE: Discoloration and staining of the wheel does not affect its performance. Only excessive buildup of foreign material needs to be removed.

8.If any belt chirping or squealing noise is present, apply a small amount of LPS-1 or equivalent dry film lubricant to the belt.

ANNUAL MAINTENANCE

1.Inspect and conduct the same procedures as outlined under Quarterly Maintenance.

2.To maintain peak latent (moisture) removal capacity, it is recommended that the energy recovery wheels be sprayed with a diluted nonacid based evaporator coil cleaner or alkaline detergent solution such as 409.

NOTE: Do not use acid based cleaners, aromatic solvents, temperatures in excess of 170°F or steam. Damage to the wheel may result.

Do not disassemble and immerse the entire heat wheel in a soaking solution, as bearing and other damage may result.

3.Rinse wheel thoroughly after application of the cleaning solution, and allow to drain before reinstalling.

4.No re-lubrication is required to heat wheel bearings of the drive motor, or to the intake and exhaust blower motors.

5.If any belt chirping or squealing noise is present, apply a small amount of LPS-1 or equivalent dry film lubricant to the belt.

Manual 2100-310D

Page 5

FIGURE 1

BELT REPLACEMENT INSTRUCTIONS

Belt Replacement

Instructions

Route this part of replacement belt in top groove of pulley.

Route this part of replacement belt in bottom groove of pulley.

If belt "squeaks" or "chirps" lubricate lightly with LPS-1 or equivalent "dry film" lubricant.

MIS-1890

Manual 2100-310D

Page 6

FIGURE 2

HUB ASSEMBLY WITH BALL BEARINGS

Manual 2100-310D

Page 7