OPEAION INUCION ENEGY ECOEY ENIAO WI EXAU Model: 92-31 92-32 For Use With Bard 2 hrough 5 on Q eries eat Pumps Bard Manufacturing Company, Inc. Bryan, Ohio 4356 ince 1914...Moving ahead, just as planned. Manual: 21-473 upersedes: NEW File: olume II, ab 14 Date: 4-7-6 Copyright 26 Manual 21-473 Page 1 of 1
CONEN Electrical pecifications... 3 General Description of E... 3 Control equirements... 3 ecommended Control equences... 4 entilation Air Flow... 4 Energy ecovery entilator Maintenance... 6 & 7 Maintenance Procedures... 7 Figures Figure 1 Blower peed Adjustment... 4 Figure 2 Belt eplacement... 8 Figure 3 ub Assembly with Ball Bearings... 9 ables able 1 entilation Air (CFM)... 4 able 2 ummer Cooling Performance... 5 able 3 Winter eating Performance... 6 Control Wiring... 1 COPYIG API 26 BAD MANUFACUING COMPANY BYAN, OIO UA 4356 Manual 21-473 Page 2 of 1
EECICA PECIFICAION Model 92-31 92-32 oltage Amps Control oltage 23 / 28 2. 2 24 GENEA DECIPION he Energy ecovery entilator 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 CO 2, smoke radon, formaldehyde, excess moisture, virus and bacteria. he 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. he package consists of a unique rotary Energy ecovery Cassette that can be easily removed for cleaning or maintenance. It has two 15 inch diameter heat transfer wheels for efficient heat transfer. he heat transfer wheels use a permanently bonded dry desiccant coating for total heat recovery. entilation 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. he rotating energy wheels provide the heat transfer effectively during both summer and winter conditions. Provides required ventilation to meet the requirements of AAE 62.1 standard. NOE: Operation is not recommended below 5 F outdoor temperature because freezing of moisture in the heat transfer wheel can occur. Model 92-31 92-32 For Use With Following Units Q24-A, -B, -C Q3-A, -B, -C Q36-A, -B, -C Q42-A, -B, -C Q48-A, -B, -C Q6-A, -B, -C Q24-A, -B, -C Q3-A, -B, -C Q36-A, -B, -C Q42-A, -B, -C Q48-A, -B, -C Q6-A, -B, -C Electrical 23/28 1 or 3 Phase 46 3 Phase CONO EQUIEMEN 1. Indoor blower motor must be run when ever the E is run. 2. elect the correct motor speed on the E. Using able 1 of the E 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 E if only 2 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. ystem operation costs would also increase. 3. un the E only during periods when the conditioned space is occupied. unning the E during unoccupied periods wastes energy, decreases the expected life of the E, and can result in a large moisture buildup in the structure. he E removes 6 to 7% of the moisture in the incoming air, not 1% of it. unning the E when the structure is unoccupied allows moisture to build up in the structure because there is little or no cooling load. hus, 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. IMPOAN Operating the E during unoccupied periods can result in a build up of moisture in the classroom. Manual 21-473 Page 3 of 1
ECOMMENDED CONO EQUENCE everal possible control scenarios are listed below: 1. Use a programmable electronic thermostat with auxiliary terminal to control the E based on daily programmed occupancy periods. Bard markets and recommends the White-odgers 1F93-38 (Bard Part No. 843-49), 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 C2A for this use. 3. Use a DDC control system to control the E based on a room occupancy schedule to control the E. 4. ie the operation of the E into the light switch. he lights in a room are usually on only when occupied. 5. Use a manual timer that the occupants turn to energize the E for a specific number of hours. 6. Use a programmable mechanical timer to energize the E and indoor blower during occupied periods of the day. ENIAION AI FOW he E 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. ABE 1 ENIAION AI (CFM) igh peed (Black) Medium peed (Blue) ow peed (ed) CFM 45 3 3 he E units are wired from the factory on medium intake and low exhaust speeds. he E 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. his is accomplished by setting the intake blower on a higher speed than the exhaust blower. WANING Open disconnect to shut all power OFF before doing this. Failure to do so could result in injury or death due to electrical shock. Moving the speed taps located in the control panel can change the blower speed of the intake and exhaust. ee Figure 1. FIGUE 1 BOWE PEED ADJUMEN MI-212 Manual 21-473 Page 4 of 1
Manual 21-473 Page 5 of 1 PEFOMANCE AND APPICAION DAA ABE 2 UMME COOING PEFOMANCE (INDOO DEIGN CONDIION DB / 62 WB) EGEND = entilation oad otal = eat ecovery otal = entilation oad ensible = eat ecovery ensible = entilation oad atent = eat ecovery atent Ambient O.D. CFM 45 ENIAION AE % Efficiency CFM 3 ENIAION AE 66% Efficiency CFM 3 ENIAION AE 67% Efficiency DB/WB egreesf D 15 7 214 1458 1458 1458 1458 1458 6884 9477 9477 9477 9477 9477 44 1215 1215 1215 1215 1215 5737 1185 818 818 818 818 818 3786 1431 972 972 972 972 972 459 9587 12 12 12 12 12 3 1 8 7 6 214 1215 1215 1215 1215 1215 1215 1215 1944 9314 22 2533 829 12635 4 131 26325 1293 1125 1125 1125 1125 1125 1125 1125 162 7762 168 17374 1185 1692 5123 111 216 1431 81 81 81 81 81 81 81 1296 621 135 1411 9587 8683 416 9 95 8 7 6 214 972 972 972 972 972 972 972 2187 11744 2632 2533 829 14215 7634 1711 26325 1293 81 81 81 81 81 81 81 18225 9787 2193 17374 1185 1228 6459 1447 216 1431 648 648 648 648 648 648 648 1458 783 15 1411 9587 9768 5246 11 9 8 7 6 214 729 729 729 729 729 729 729 243 141 562 2533 829 15794 9213 329 26325 1293 6 6 6 6 6 6 6 225 11812 4218 17374 1185 49 49 49 49 49 49 49 133 7796 2784 216 1431 486 486 486 486 486 486 486 162 945 33 1411 9587 1854 6331 2261 85 8 7 6 214 486 486 486 486 486 486 486 2673 16 7492 2533 829 17374 1793 487 26325 1293 45 45 45 45 45 45 45 222 13837 6243 17374 1185 1471 9132 412 216 1431 324 324 324 324 324 324 324 1782 117 4995 1411 9857 217 217 217 217 217 217 217 11939 7416 3346 8 7 6 214 4252 243 243 243 243 243 1935 9922 1822 829 2764 1579 1579 1579 1579 1579 12372 6449 1184 1293 3543 225 225 225 225 225 15862 8268 1518 1185 2338 1336 1336 1336 1336 1336 1469 5457 12 1431 2835 162 162 162 162 162 1269 6615 1215 9587 1899 185 185 185 185 185 852 4432 814 7 6 4252 4252 829 2764 829 2764 1293 3543 1293 3543 2338 2338 2835 2835 1899 1899
ABE 3 WINE EAING PEFOMANCE (INDOO DEIGN CONDIION 7 F DB) Ambient O.D. DB Degrees F ENIAION AE 45 CFM 8% Eff. 3 CFM 81% Eff. 3 CFM 82 Eff. W W W W W W 243 1944 225 164 162 1328 6 486 3888 45 328 324 26 55 729 5832 6 492 486 3985 5 972 7776 81 61 648 5313 45 1215 972 1125 821 81 6642 4 1458 11664 1215 9841 972 797 35 171 1368 141 11481 1134 9298 3 1944 15552 162 13122 1296 1627 25 2187 17496 18225 14762 1458 11955 2 243 1944 225 1642 162 13284 15 2673 21384 222 1842 1782 14612 EGEND W = Winter entilation oad W = Winter eat ecovery NOE: ensible performance only is shown for winter application. ENEGY ECOEY ENIAO MAINENANCE GENEA INFOMAION he ability to clean exposed surfaces within air moving systems is an important design consideration for the maintenance of system performance and air quality. he 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. otary counterflow heat exchanges (heat wheels) with laminar airflow are self-cleaning with respect to dry particles. maller 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. FEQUENCY 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. owever, 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. imilar 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 4% or more may develop over a period of one to three years. Manual 21-473 Page 6 of 1
CEANABIIY AND PEFOMANCE 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. he 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. MAINENANCE POCEDUE NOE: ocal 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. he following timetables are recommended and can be altered based on local experience. QUAEY MAINENANCE 1. Inspect mist eliminator/prefilter and clean if necessary. his 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. he 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. his filter is located behind the front-hinged service door. 3. Inspect energy recovery ventilator for proper wheel rotation and dirt buildup. his 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. ecommended energy recovery wheel cleaning procedures follow: Disconnect all power to the unit. Open the front-hinged service door to the unit. 5. emove the front cassette retaining panel from the front of the E. Unplug the amp connectors to the cassette drive motor. lide 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. everse shop vacuum to use as a blower and blow out any residual dry debris from the wheel. NOE: 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 P-1 or equivalent dry film lubricant to the belt. ANNUA MAINENANCE 1. Inspect and conduct the same procedures as outlined under Quarterly Maintenance. 2. o 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 49. NOE: Do not use acid based cleaners, aromatic solvents, temperatures in excess of 17 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. inse 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 P-1 or equivalent dry film lubricant to the belt. Manual 21-473 Page 7 of 1
FIGUE 2 BE EPACEMEN INUCION oute (1) replacement belt in top groove of pulley. Belt eplacement Instructions oute (1) replacement belt in bottom groove of pulley. If belts "squeak" or "chirp" lubricate lightly with P-1 or equivalent "dry film" lubricant. MI-2166 Manual 21-473 Page 8 of 1
FIGUE 3 UB AEMBY WI BA BEAING Manual 21-473 Page 9 of 1
CONO WIING he E comes from the factory with the low voltage control wires not wired into the wall mount low voltage terminal strip. Care must be taken when deciding how to control the operation of the ventilator. When designing the control circuit for the ventilator, the following requirements must be met. CONO EQUIEMEN 1. Indoor blower motor must be run whenever the E is run. 2. elect the correct motor speed tap in the E. Using able 1 of the E 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 E- A5C if only 2 CFM of ventilation air is needed. Use the low speed tap. Using the high speed tap would serve no useful purpose and significantly affect the overall efficiency of the air conditioning system. ystem operating cost would also increase. 3. un the E only during periods when the conditioned space is occupied. unning the E during unoccupied periods wastes energy, decreases the expected life of the E, and can result in a large moisture buildup in the structure. he E removes 6 to 7% of the moisture in the incoming air, not 1% of it. unning the E when the structure is unoccupied allows moisture to build up in the structure because there is little or now cooling load. hus, 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. * * * IMPOAN *** Operating the E during unoccupied periods can result in a build up of moisture in the structure. ECOMMENDED CONO EQUENCE everal possible control scenarios are listed below: 1. Use a programmable electronic thermostat with auxiliary terminal to control the E based on daily programmed occupance periods. Bard markets and recommends the White-odgers 1F93-38 (Bard Part No. 843-49). 2. Use a motion sensor in conjunction with a mechanical thermostat to determine occupancy in the structure. Bard markets the C2A for this use. 3. Use a DDC control system to control the E based on a room occupancy schedule to control the E. 4. ie the operation of the E into the light switch. he lights in a room are usually on only when occupied. 5. Use a manual timer that the occupants turn to energize the E for a specific number of hours. 6. Use a programmable mechanical timer to energize the E and indoor blower during occupied periods of the day. he units are set from the factory with the exhaust blower on the low speed and the intake blower on medium speed. Manual 21-473 Page 1 of 1