OPERATION INSTRUCTIONS ENERGY RECOVERY VENTILATOR WITH EXHAUST Models: 920-0074 QWSERV 920-0138 QWSERV with Intelligent Defrost For Use With Bard 2 Through 5 Ton QW*S Series Bard Manufacturing Company, Inc. Bryan, Ohio 43506 Since 1914...Moving ahead, just as planned.
CONTENTS Electrical Specifications............................................ 3 General Description.................................................. 3 920-0074 & -0138 with Intelligent Defrost................ 3 Control Requirements.............................................. 3 Recommended Control Sequences......................... 4 Control Wiring........................................................... 4 Ventilation Airflow.....................................................
ELECTRICAL SPECIFICATIONS Model Voltage Amps Control Voltage 920-0074 920-0138 230 / 208 2.2 24V Model For Use with the Following Units 920-0074 920-0138 QW2S-A, -B, -C QW3S-A, -B, -C QW4S-A, -B, -C QW5S-A, -B, -C GENERAL DESCRIPTION CONTROL REQUIREMENTS The Energy Recovery Ventilator was designed to provide energy efficient, cost effective ventilation to meet I. A. Q.
RECOMMENDED CONTROL SEQUENCES Several possible control scenarios are listed below: 1. Use a programmable electronic thermostat with auxiliary terminal to control the ERV based on daily programmed occupancy periods. Bard markets and recommends Bard Part No. 8403-060 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 CS2000A for this use. 3.
PERFORMANCE AND APPLICATION DATA TABLE 2 SUMMER COOLING PERFORMANCE (INDOOR DESIGN CONDITIONS 75°DB/62°WB) Ambient O.D.
TABLE 3 WINTER HEATING PERFORMANCE — (INDOOR DESIGN CONDITIONS 70°F DB) VENTILATION RATE Ambient O.D.
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.
FIGURE 2 BELT REPLACEMENT INSTRUCTIONS Route (1) replacement belt in top groove of pulley. Belt Replacement Instructions Route (1) replacement belt in bottom groove of pulley. If belts "squeak" or "chirp" lubricate lightly with LPS-1 or equivalent "dry film" lubricant.
FIGURE 3 HUB ASSEMBLY WITH BALL BEARINGS Manual 2100-533E Page 9 of 12
Intake Damper Motor Cassette Motor Capacitor Intake Blower Motor Exhaust Blower Motor Capacitor Black/White Component Blower Motor Cassette Motor Yellow Green Orange Brown Capacitor 4/370 3/250 1 2 3 4 Cassette 26 Motor Plug White Red (Low Speed) Blue (Med. Speed) Black (High Speed) Red (Low Speed) Blue (Med.
Manual 2100-533E Page 11 of 12 Intake Damper Motor Cassette Motor Capacitor Intake Blower Motor Exhaust Blower Motor Capacitor Green Orange Brown Yellow Capacitor 4/370 3/250 1 2 3 4 Cassette 26 Motor Plug White Red (Low Speed) Blue (Med. Speed) Black (High Speed) Red (Low Speed) Blue (Med.
FIGURE 4 CONFIGURING 8403-067 CO2 CONTROL VOLTAGE OUTPUT SET JUMPER PJ5 AS SHOWN C V SET JUMPER PJ2 TO VOLTAGE AS SHOWN VOLTAGE OUTPUT 2 TO 10 V 4 TO 20 mA C V MIS-3175 Manual 2100-533E Page 12 of 12 SET JUMPER PJ1 TO CURRENT AS SHOWN
