Arkansas HVACR NewsMagazine March 2020

S tate, National, Chapter News State national Chapter News

Equipment Sizing 2018 IECC requires systems to be sized by Manual J load calculation and S equipment sizing. Manual S will take us to a better understanding of equipment matching and Sensible Heat Ratio. R403.7 Equipment sizing and efficiency rating (Mandatory). Heating and cooling equipment shall be sized in accordance with ACCA Manual S based on building loads calculated in accordance with ACCA Manual J or other approved heating and cooling calculation methodologies. New or replacement heating and cooling The intricacies of each of these codes varies from simple to a bit more complicated; THEREFORE, it is imperative that each person take advantage of the “Stakeholder” meetings. If attending is impossible, one should submit their opinions to the Arkansas Energy Office. You can mail or email. It would be best to use the following Arkansas Amendment Form.doc equipment shall have an efficiency rating equal to or greater than the minimum required by federal law for the geographic location where the equipment is installed.

Whole-house Mechanical Ventilation Whole house ventilation has become the responsibility of the HVAC contractor. It is an area that we are struggling to comply with. There is significant debate and many have defaulted to Energy Recovery Ventilation systems. Of course, that is an expensive add on. When ventilation systems use the furnace or air handler blower to move air, the blower must be an ECM. If the ventilation system has its own blower it must comply with code efficiency standards. R403.6 Mechanical ventilation (Mandatory). The building shall be provided with ventilation that complies with the requirements of the International Residential Code or International Mechanical Code , as applicable, or with other approved means of ventilation. Outdoor air intakes and exhausts shall have automatic or gravity dampers that close when the ventilation system is not operating. R403.6.1 Whole-house mechanical ventilation system fan efficacy. Fans used to provide whole-house mechanical ventilation shall meet the efficacy requirements of Table R403.6.1. Exception: Where an air handler that is integral to tested and listed HVAC equipment is used to provide whole-house mechanical ventilation, the air handler shall be powered by an electronically commutated motor.

Just click on the blue link above, compete the form, and submit to energyinfo@adeq.state.ar.us