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INSTALLATION INSTRUCTIONS

Bard Manufacturing Company, Inc. 
Bryan, Ohio 43506
www.bardhvac.com

Manual:        2100-764
Supersedes: 

NEW

 

Date: 1-19-22

Commercial Room Ventilator  

with Exhaust and Optional CO

2

 Modulation

Model: QCRV-4 (920-0540)

For Use with Bard QC501 Series 

Chilled Water Air Conditioners

Summary of Contents for QCRV-4

Page 1: ...cturing Company Inc Bryan Ohio 43506 www bardhvac com Manual 2100 764 Supersedes NEW Date 1 19 22 Commercial Room Ventilator with Exhaust and Optional CO2 Modulation Model QCRV 4 920 0540 For Use with...

Page 2: ...ard Sequence of Operation 5 Adding Optional CO2 Control Sensor 6 Figures Figure 1 Adjusting OCC Potentiometer on CRV Control Board 3 Figure 2 CRV Installation and Adjustment 4 Figure 3 CRV Control Boa...

Page 3: ...with built in exhaust provisions FIGURE 1 Adjusting OCC Potentiometer on CRV Control Board QCRV 4 The QCRV 4 has a spring return damper blade If vent operation is no longer required or in the event of...

Page 4: ...pressure drop 3 Indoor blower motor speed 4 Damper blade open position setting for each mode of operation 5 Tightness or looseness of building envelope To determine the amount of fresh air that will b...

Page 5: ...rminal strip is energized indicating occupancy Once the selected time has passed the blade will move to the position set by the OCC potentiometer OCC Potentiometer setting This potentiometer can be us...

Page 6: ...nsor Bard Part 8403 096 to this control will maximize the capabilities of this vent by only supplying fresh air intake to maintain CO2 levels This has multiple benefits Minimizes ventilation load on s...

Page 7: ...tuator Motor BROWN WHITE 2 BLACK P3 3 P3 2 P3 1 OPTIONAL CO2 CONTROL REQUIRED FIELD WIRING FOR 1 B ON OFF CO2 CONTROL Unused Tape off 3 TERMINAL STRIP A B CRV CONTROL BOARD UNIT LOW VOLT B SETTING KEY...

Page 8: ...O CHANGE ANY SETTINGS WITH THE SIDE BUTTONS TO LOCK THE CO2 DIP SWITCHES MUST BE POSITIONED AS SHOWN FOR PROPER OPERATION MIS 4025 C Settings Recommended Default RON RELAY ON SET POINT 725 ROF RELAY O...

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