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INSTALLATION INSTRUCTIONS
ECONOMIZERS WITH EXHAUST
Model
EIFM-5C
For Use with Bard 3-1/2 through 6 Ton
Wall Mount Air Conditioners
and Heat Pumps
Manual : 2100-447
Bard Manufacturing Company
Supersedes:
Bryan, Ohio 43506
File: Volume III Tab 19
Since 1914...moving ahead just as planned.
Date: 12-14-04
© Copyright 2004
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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 GENERAL INFORMATION DESCRIPTION The economizer should only be installed by a trained The EIFM-5 economizer is designed to be used with heating and air conditioning technician. These Bard 3-1/2 through 5 ton wall mount series air instructions serve as a guide to the technician installing conditioners and heat pumps equipped with low ambient the economizer package. They are not intended as a fan cycling controls. They are electromechanical step by step procedure with which the mechanic
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INSTALLATION 2. Remove and save the existing exterior blower BASIC INSTALLATION access and service access panels on the Bard wall 1. Unpack the economizer assembly which includes mount unit. (See Figure 1.) the integral economizer with attached electrical 3. Remove and save existing unit return air filter and harness, mixed air thermistor, miscellaneous center screw in front grille. (See Figure 1.) hardware and installation instructions. 4. Remove and discard the exhaust cover plate. (See Figur
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IMPORTANT: Position front lip of economizer on 7. Open unit control panel to gain access to unit low top of front grille and condenser partition (See voltage terminal block. Figure 2 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 of the economizer. LEFT HAND UNITS Slide the economizer to (See Figure 3.) the left until it is tight against the back of the corner 9. Route ele
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FIGURE 3 MIS-1356 Manual 2100-447 Page 4
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Manual 2100-447 Page 5 FIGURE 4 TOP VIEW OF CONTROL PANEL MIS-350 MIS-350
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10. Connect leads with fork terminal to corresponding 3. Calculate the mixed air temperature (MAT) points on terminal strip. RE: C.Y.G. (See wiring which will result from the desired diagram.) combination of OAT (10 percent) and RAT (90 percent). 11. Wire nut leads with 5/8" stripped ends to Y1 and Y2 leads from thermostat. See wiring diagram in .1 OAT + .9 RAT = MAT this manual. or substituting example values NOTE: Wires referenced in note one on wiring .1 (60°F) + .9 (75°F) = 7
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F. Readjust temperature on the thermostat to ECONOMIZER SEQUENCE OF OPERATION engage the second stage of cooling (Y2). Condition A Cool Outdoors The damper motor should return to previously set minimum position. Compressor motor First stage cooling closes and powers the economizer should start. dampers to economizer mode and the indoor blower G. Switch thermostat to OFF fan and OFF heat/ starts. Mixed Air Sensor senses a mixture of return air cool positions to de-energize unit. and outdoor
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CONDITION B WARM OUTDOORS First stage cooling cycles the compressor and dampers remain in mechanical cooling mode. FIGURE 6 MECHANICAL COOLING OPERATION MIS-348 Manual 2100-447 Page 8
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FIGURE 7 ECONOMIZER OPERATION FOR SINGLE COMPRESSOR UNIT MIS-1351 WALL THERMOSTATS FOR HEAT PUMPS WITH ECONOMIZER FOR AIR CONDITIONING WITH ECONOMIZER Thermostat Part 8403-027 (White Rodgers IF92-71) Thermostat Part 8403-021 (Honeywell T874D1934) Electronic Heat Pump Thermostat Subbase Part 8404-012 (Honeywell Q674A1001) 2 Stage Cool / 3 Stage Heat 2 Stage Cool / 2 Stage Heat Manual 2100-447 Page 9
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Manual 2100-447 Page 10
