EKO_Q25_CoolingSystem Version 7.1.1

PHOTO REQUIRED of Cooling System (Coil and Condenser) nameplate/model number and controls per MINHERS Chapter 9. Raters/RFIs are responsible for documenting reasons for missing photos. For space cooling systems, confirm that system types, fuel types, locations and number of units which are entered into the software are substantiated by plans and/or field data collected by the Rater/RFI for the actual condition of the rated home. Also confirm that output capacities, efficiencies, cooling sensible heat fractions, heat pump fan power and heat pump energy which are entered into the software correspond with what is shown on AHRI certificates or OEM data.

• Air Handlers are part of the duct system. For software that does not otherwise capture heating/cooling equipment location, make sure air handler locations are captured in the duct location entries.
• Cooling fuels are described in equipment definitions, and should match the fuels/rates defined for the building as a whole.
• Photographs of installed air handlers, coils, ductless heads, and outside units will capture type and location.
• Photographs of meters and tanks can capture fuels used in the home.
• For split refrigerant systems, capacity is a function of both the inside and outside coil(s). AHRI requires both model numbers to define equipment efficiency and capacity.
• If both coils are from the same manufacturer, OEM matching tables usually provide the values.
• For non-split systems, nameplate photographs typically have full specifications listed.
• Ground source heat pumps will have different efficiencies depending on whether they’re closed-loop (brine) systems or open-loop (water source) systems. OEM charts usually list all options.
• GSHP pump energy: electrical consumption by the pumps can have a notable impact on system efficiency: Water source heat pumps (open-loop) typically use higher wattage pumps than those used for closed-loop heat pumps. Variable speed pumps may have varying wattage. Refer to manufacturer’s specs to determine wattage based on flow settings.
• GSHP Wells: confirm that well type, number of wells, well depth and loop flow which are entered into the software correspond with the plans for projected ratings, and/or correspond with site data collected by the Rater/RFI in the field for the actual condition of the house being rated.

SCORING:

• Satisfactory: No errors in cooling system modeling
• 1: one to two minor errors in cooling modeling (listed below) (this is per modeled system)
• 2: NO PHOTO OR three to four minor errors (listed below) in cooling modeling OR one to two major errors in cooling modeling (this is per modeled system)
• 3: Incorrect number of units OR five or more minor errors (listed below) OR three or more major errors in cooling modeling (listed below) (this is per modeled system) of either heating, cooling or hot water heating system

Minor Cooling Modeling Errors:

• Modeled SEER/SEER2/EER value off by 0.5 to 1.0 from AHRI certificate, supporting documentation, or conversion calculation
• Modeled output capacity off by 2 kBtu/h to 5 kBtu/h from AHRI Certificate or supporting docs
• Incorrect fan motor type modeled
• % Cooling Load Served off by 2% to 5%
• Incorrect location identified for Cooling System

Major Cooling Modeling Errors:

• Incorrect equipment type identified
• Incorrect fuel type identified
• Modeled SEER/SEER2/EER off by greater than 1.0 from AHRI certificate, supporting documentation, or conversion calculation
• SEER2 not properly converted to SEER or the improper SEER/SEER2 dropdown was selected in the building model
• SEER value from supporting documentation is modeled as SEER2 value
• Modeled output capacity off by greater than 5 kBtu/h from AHRI Certificate or supporting docs
• % Cooling Load Served off by greater than 5%