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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
Manual: 2100-310D
BARD MANUFACTURING COMPANY
Supersedes: 2100-310C
Bryan, Ohio 43506
File: Volume II, Tab 14
Since 1914...Moving ahead, just as planned.
Date: 01-10-05
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CONTENTS Figures QERV Model Nomenclature ................................... 1 Figure 1 Belt Replacement Instructions ................. 6 Electrical Specifications .......................................... 1 Figure 2 Hub Assembly with Ball Bearings ............ 7 General Description of QERV ................................ 1 Control Requirements ............................................ 1 Tables Table 1 Ventilation Air (CFM)................................ 2 Recommended Control Sequences ...
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MODEL NOMENCLATURE For Use With ModelFl ollowing Units Electrica Q ERV - A 4 B QH24-A, -B QH30-A, -B Q - QH Series QH36-A, -B 230/208 Modification Code QH42-A, -B 1 or 3 Phase Energy Recovery Ventilator QH Series Cabinet Size QH48-A, -B 4 - QH241, 301, 361, 421, QH60-A, -B QERV 481, 601 QH24-C Electrical QH30-C A - 230/208 volt QH36-C 460 QH42-C 3 Phase QH48-C QH60-C ELECTRICAL SPECIFICATIONS Control Me odelVs oltag Amp Voltage CONTROL REQUIREMENTS Q8 E
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RECOMMENDED CONTROL VENTILATION AIR FLOW SEQUENCES The QERV is equipped with a 3 speed motor to Several possible control scenarios are listed below: provide the capability of adjusting the ventilation rates to the requirements of the specific application by 1. Use a programmable electronic thermostat with simply changing motor speeds. auxiliary terminal to control the QERV based on daily programmed occupancy periods. Bard TABLE 1 markets and recommends the White-Rodgers VENTILATION AIR (CFM)
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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 DT egreesFVS L VL L VT L HS RHL RHT RVS L VL L VT L HS RHL RHT RVS L VL L VT L HS RHL R HR 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
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TABLE 3 WINTER HEATING PERFORMANCE (INDOOR DESIGN CONDITIONS 70° F DB) Ambient OE .D. VENTILATION RAT 4. 50 CFM 80% Eff.3. 75 CFM 81% Eff 300 CFM 802 Eff DB Degrees F WR VLWL H WR V WL H WR V WH 60 5 24 43 15 94 20 02 10 64 18 62 132 60 0 48 86 30 88 40 05 30 28 36 24 265 50 5 72 29 55 83 60 07 40 92 45 86 398 50 0 96 72 70 7781 10 60 5663 48 531 40 5 10 215 95 7211 012 80 2082 10 664 40 0 14 45810 16611 215 90 8490 72 797 30 5 18 70115 36011 41710 14818 134 929 30 0 12 94410 55512 62010 31217
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6. Use a shop vacuum with brush attachment to clean CLEANABILITY AND PERFORMANCE both sides of the energy recovery wheels. In order to maintain energy recovery ventilation 7. Reverse shop vacuum to use as a blower and blow systems, energy transfer surfaces must be accessible for washing to remove oils, grease, tars and dirt that out any residual dry debris from the wheel. can impede performance or generate odors. Washing NOTE: Discoloration and staining of the wheel of the desiccant surfaces is
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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
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FIGURE 2 HUB ASSEMBLY WITH BALL BEARINGS Manual 2100-310D Page 7
