INSTALLATION INSTRUCTIONS ECONOMIZERS WITH EXHAUST MODELS EIFM-2B EIFM-3B For Use with Bard 1-1/2 thru 3 Ton Wall Mount Air Conditioners and Heat Pumps Bard Manufacturing Company Bryan, Ohio 43506 Since 1914...Moving ahead, just as planned.
CONTENTS GENERAL General Information ................................................. 1 Unpacking ................................................................ 1 Description ............................................................... 1 INSTALLATION Basic Installation ...................................................... 2 Economizers – WA, WH & WL Series .................... 8 FIGURES Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 ........................................
GENERAL GENERAL INFORMATION DESCRIPTION The economizer should only be installed by a trained heating and air conditioning technician. These instructions serve as a guide to the technician installing the economizer package. They are not intended as a step by step procedure with which the mechanically inclined owner can install the package.
INSTALLATION BASIC INSTALLATION 1. Unpack the economizer assembly which includes the integral economizer with attached electrical harness, mixed air thermistor, miscellaneous hardware and installation instructions. 2. Remove and save the existing exterior blower access and service access panels on the Bard wall mount unit. (See Figure 1.) WARNING Open and lock unit disconnect switch before installing this accessory to prevent injury or death due to electrical shock or contact with moving parts.
3. RIGHT HAND UNITS Remove and save existing unit return air filter and left side filter support bracket. Remove and save top four (4) screws from grille. (See Figure 2.) 4. Remove and discard the condenser partition blank off plate. (See Figure 2.) LEFT HAND UNITS Remove and save the existing unit return air filter and right side filter bracket.
5. FOR RIGHT HAND UNITS Install economizer by inserting the economizer into the unit to the far left side clearing the right filter bracket. Once the economizer is fully inserted, slide the economizer to the right until it is tight against the back of the control panel. (See Figure 3.) FOR LEFT HAND UNITS Install economizer by inserting the economizer into the unit to the far right side clearing the left filter bracket.
IMPORTANT: Position front lip of economizer under front grille and on top of condenser partition. (See Figure 3 inset.) This is important to ensure proper drainage of any water entering damper assembly. 6. Mount mixed air thermistor to blower partition as shown with screws provided. Bracket with sensor installs on top of blower partition. Screws are inserted from the underside. Route wires as shown and secure with wire tie. Connect wires to thermistor. (See Figures 2 & 3.) 7.
Manual 2100-390 Page 6 FIGURE 5 TOP VIEW OF CONTROL PANEL MIS-350
. Connect lead with fork terminal to corresponding points on terminal strip. Re.: C.Y.G. (See wiring diagram.) 10. Wire nut leads with 5/8” stripped ends to Y1 and Y2 leads from thermostat. See wiring diagram in this manual or on economizer. NOTE: Wires referenced in Note 1 on wiring diagram are for special control application only and are not normally used. These wires may be used in conjunction with other circuitry to open the damper regardless of outside temperature and humidity.
ECONOMIZER – WA, WL & WH SERIES ECONOMIZER SEQUENCE OF OPERATION FEATURES CONDITION A – COOL OUTDOORS • One piece construction – easy to install with no First stage cooling closes and powers the economizer dampers to economizer mode and the indoor blower starts. Mixed Air Sensor senses a mixture of return air and outdoor air and modulates the dampers accordingly. Compressor operation is inhibited. (See Figure 6.) mechanical linkage adjustment required.
CONDITION B – WARM OUTDOORS First stage cooling cycles and compressor and dampers remain in mechanical cooling mode.
FIGURE 8 ECONOMIZER OPERATION FOR SINGLE COMPRESSOR UNIT MIS-1351 WALL THERMOSTATS FOR HEAT PUMPS WITH ECONOMIZER Thermostat Part 8403-027 (White Rodgers IF92-71) Electronic Heat Pump Thermostat 2 Stage Cool / 3 Stage Heat Manual 2100-390 Page 10 FOR AIR CONDITIONING WITH ECONOMIZER Thermostat Part No. 8403-021 (Honeywell T874D1934) Subbase part no.
Manual 2100-390 Page 11
