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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 Manual : 2100-390
Bryan, Ohio 43506 Supersedes:
File: Volume III Tab 19
Since 1914...Moving ahead, just as planned.
Date: 04-26-01
© Copyright 2001
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CONTENTS FIGURES GENERAL General Information ................................................. 1 Figure 1 ................................................................ 2 Unpacking ................................................................ 1 Figure 2 ................................................................ 3 Description ............................................................... 1 Figure 3 ................................................................ 4 Figure 4 ...........
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GENERAL DESCRIPTION GENERAL INFORMATION The economizer should only be installed by a trained The EIFM-2 and EIFM-3 economizers are designed to be used with Bard 1-1/2 thru 3 ton wall mount series air heating and air conditioning technician. These instructions serve as a guide to the technician installing conditioners and heat pumps with low ambient fan cycling controls. They are electromechanical the economizer package. They are not intended as a step by step procedure with which the mechanic
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INSTALLATION BASIC INSTALLATION 1. Unpack the economizer assembly which includes 2. Remove and save the existing exterior blower access the integral economizer with attached electrical and service access panels on the Bard wall mount harness, mixed air thermistor, miscellaneous unit. (See Figure 1.) hardware and installation instructions. WARNING Open and lock unit disconnect switch before installing this accessory to prevent injury or death due to electrical shock or contact with mov
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3. RIGHT HAND UNITS Remove and save existing 4. Remove and discard the condenser partition blank unit return air filter and left side filter support off plate. (See Figure 2.) bracket. Remove and save top four (4) screws from grille. (See Figure 2.) LEFT HAND UNITS Remove and save the existing unit return air filter and right side filter bracket. FIGURE 2 MIS-345 Manual 2100-390 Page 3
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5. FOR RIGHT HAND UNITS Install economizer FOR LEFT HAND UNITS Install economizer by inserting the economizer into the unit to the far by inserting the economizer into the unit to the far left side clearing the right filter bracket. Once the right side clearing the left filter bracket. Once the economizer is fully inserted, slide the economizer to economizer is fully inserted, slide the economizer to the right until it is tight against the back of the the left unit it is tight against the
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7. Open unit control panel to gain access to unit low IMPORTANT: Position front lip of economizer under voltage terminal block. front grille and on top of condenser partition. (See Figure 3 inset.) This is important to ensure proper 8. FOR LEFT HAND UNITS Reroute economizer drainage of any water entering damper assembly. wiring harness to the left side. (See Figure 4.) 6. Mount mixed air thermistor to blower partition as 9. Route electrical harness leads through the 7/8” shown with scre
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Manual 2100-390 Page 6 FIGURE 5 TOP VIEW OF CONTROL PANEL MIS-350
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9. Connect lead with fork terminal to corresponding D. Adjust the enthalpy control to position A, B, C, points on terminal strip. Re.: C.Y.G. (See wiring or D to achieve the maximum combination of diagram.) temperature and humidity acceptable for the installation as per Table 2 below. The 10. Wire nut leads with 5/8” stripped ends to Y1 and suggested setting is between A & B 70° DB Y2 leads from thermostat. See wiring diagram in @ 55 percent RH. It is further recommended to this manual or o
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ECONOMIZER – WA, WL & WH SERIES ECONOMIZER SEQUENCE OF OPERATION CONDITION A – COOL OUTDOORS FEATURES First stage cooling closes and powers the economizer One piece construction – easy to install with no dampers to economizer mode and the indoor blower mechanical linkage adjustment required. starts. Mixed Air Sensor senses a mixture of return air Exhaust air damper – built in with positive closed and outdoor air and modulates the dampers accordingly. position. Provides exhaust air capab
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CONDITION B – WARM OUTDOORS First stage cooling cycles and compressor and dampers remain in mechanical cooling mode. FIGURE 7 MECHANICAL COOLING OPERATION MIS-348 Manual 2100-390 Page 9
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FIGURE 8 ECONOMIZER OPERATION FOR SINGLE COMPRESSOR UNIT MIS-1351 WALL THERMOSTATS FOR HEAT PUMPS WITH ECONOMIZER FOR AIR CONDITIONING WITH ECONOMIZER Thermostat Part No. 8403-021 (Honeywell T874D1934) Thermostat Part 8403-027 (White Rodgers IF92-71) Electronic Heat Pump Thermostat Subbase part no. 8404-012 (Honeywell Q674A1001) 2 Stage Cool / 2 Stage Heat 2 Stage Cool / 3 Stage Heat Manual 2100-390 Page 10
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Manual 2100-390 Page 11
