Bard WGEIFM-3C Installation Instructions Manual
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Contents
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Manual 2100-498BPage 8 of 17EXAMPLE:1. Measure return air temperature (RAT)(assume 75° F for example).2. Measure outdoor air temperature (OAT)(assume 60° F for example).3. Calculate the mixed air temperature (MAT)which will result from the desiredcombination of OAT (10 percent) and RAT(90 percent)..1 OAT + .9 RAT = MATor substituting example values.1 (60° F) + .9 (75° F) = 73.75° F4. Adjust the minimum position potentiometerknob until proper mixed air temperature ascalculated above is reached. Care shouldbe taken to insure thermometer is sensingair that is well mixed.5. Mark correct setting on dial of minimumposition potentiometer for future reference.D. Adjust the economizer logic module toposition A, B, C and D to achieve themaximum combination of temperature andhumidity acceptable for the installation as perTable 2. The suggested setting is betweenA & B 70° DB @ 55 percent RH. It isfurther recommended to always set thecontrol at C or above.) (See Figure 5.)E. Switch the thermostat fan control to automaticand position the heat/cool switch to cool.Adjust the thermostat temperature to engagethe first stage of cooling only (Y). This willcause the dampers to modulate to achievemixed air temperature of 55° provided outsideair enthalpy is sufficiently low. If enthalpy istoo high for economizing, low enthalpy can besimulated by temporarily removing andjumping leads on terminals 2 and 3 ofenthalpy control together. This will also causethe economizer damper to modulate awayfrom minimum position. (Be sure to properlyreconnect leads at end of checkoutprocedure).F. Readjust temperature on the thermostat toengage the second stage of cooling (Y2).The damper motor should return to previouslyset minimum position. Compressor motorshould start.G. Switch thermostat to OFF fan and OFF heat/cool positions to de-energize unit.Economizer damper should return to fullclosed (100 percent return air) position.Checkout is complete.14. Replace control access panel and mist eliminator.15. Remove blank off plate or barometric fresh airdamper if installed on the service access panel. Plugthe four (4) holes used to mount the BOP or BFADwith the plastic plugs supplied with the economizer.16. Replace service access panel.17. Economizer is now ready for operation.TABLE 2ECONOMIZER LOGIC CONTROL SETTINGlaiDgnitteS HR%02 HR%05 HR%08yplahtnElotnoCgnitteSA F.ged08)C.ged62(F.ged37)C.ged32(F.ged66)C.ged91(B F.ged67)C.ged42(F.ged07)C.ged12(F.ged36)C.ged71(C F.ged47)C.ged32(F.ged66)C.ged91(F.ged95)C.ged51(D F.ged17)C.ged12(F.ged36)C.ged71(F.ged45)C.ged21( |
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