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INSTALLATION INSTRUCTIONS
Commercial Room Ventilator
with Exhaust and Optional CO
For Use with Bard QC501 Series
Model: QCRV-4 (920-0540)
Chilled Water Air Conditioners
Bard Manufacturing Company, Inc.
Bryan, Ohio 43506
www.bardhvac.com
Modulation
2
Manual:
2100-764
Supersedes: NEW
Date:
1-19-22
Page
1 of 8
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Summary of Contents for Bard QCRV-4
- Page 1 INSTALLATION INSTRUCTIONS Commercial Room Ventilator with Exhaust and Optional CO Modulation Model: QCRV-4 (920-0540) For Use with Bard QC501 Series Chilled Water Air Conditioners Bard Manufacturing Company, Inc. Manual: 2100-764 Bryan, Ohio 43506 Supersedes: NEW Date: 1-19-22 www.bardhvac.com Page 1 of 8...
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Page 2: Table Of Contents
CRV Board Sequence of Operation ......5 Figure 4 CRV Wiring Diagram ......7 Adding Optional CO Control Sensor ......6 Figure 5 8403-096 CO Sensor Set Up ....8 Table Table 1 QCRV-4 Ventilation Mode ....... 5 Manual 2100-764 Page 2 of 8... -
Page 3: Description
Description QCRV-4 The QCRV commercial room ventilator (CRV) is The QCRV-4 has a spring return damper blade. If vent designed to be used with Bard QC501 series chilled operation is no longer required or in the event of a water air conditioners. It is an electromechanical power loss, the blade will spring return close. - Page 4 Ventilator Air To determine the amount of fresh air that will be supplied to the structure: NOTE: QCRV-4 is factory adjusted to the "B" blade setting. 1. Determine the pressure drop of the supply air duct (see Table 1). For duct-free applications with return...
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Page 5: Qcrv-4
“OCC” Potentiometer setting: This potentiometer can QCRV-4 (see Figure 1 on page 3). Label on right be used to adjust the blade setting for outdoor air side of QCRV indicates the A, B, C, D and E intake when the "3"... -
Page 6: Adding Optional Co Control Sensor
Figure 4 or the one on the ventilator assembly. 2-10VDC signal with a resistive load greater than 5. To check operation, restore power to the unit. 5000 ohms. Bard CO sensor part #8403-096 can 6. Make sure that thermostatic control is in be used when the 2-10V output is connected to “occupied”... -
Page 7: Figure 4 Crv Wiring Diagram
FIGURE 4 CRV Wiring Diagram UNIT LOW -VOLT *A - MODULATING CO2 CONTROL TERMINAL STRIP (8403-096) *B - ON/OFF CO2 CONTROL (USING OCC POTENTIOMETER SETTING) REQUIRED FIELD WIRING FOR OPTIONAL CO2 CONTROL CRV CONTROL BOARD Actuator Motor BLACK WHITE Control FDBK BROWN *Unused - Tape off... - Page 8 FIGURE 5 8403-096 CO Sensor Set Up PRESS UP AND DOWN ARROWS TO ENTER CONFIGURATION MODE USE ARROWS TO SELECT SETTING. PUSH MIDDLE BUTTON TO CHANGE. CONTROLLER WILL SHOW SET. NOTE: MENU DIP SWITCH MUST BE IN "ON" POSITION #5 TO CHANGE ANY SETTINGS WITH THE SIDE BUTTONS.