EKO_Q24_HeatingSystem Version 7.1.1

PHOTO REQUIRED of Heating System nameplate/model number and controls per MINHERS Chapter 9. Raters/RFIs are responsible for documenting reasons for missing photos. For space heating 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, heating auxiliary electric use (EAE) [if relevant], heat pump fan power and heat pump energy which are entered into the software match 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.
• Heating fuels are described in equipment definitions, and should correspond with the fuels/rates defined for the building as a whole.
• Photographs of installed air handlers, boilers, 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 heating system modeling
• 1: one to two minor errors in heating modeling (listed below) (this is per modeled system)
• 2: NO PHOTO OR three to four minor errors (listed below) in heating modeling OR one to two major errors in heating 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 heating modeling (listed below) (this is per modeled system) of either heating, cooling or hot water heating system

Minor Heating Modeling Errors:

• Modeled AFUE or HSPF/HSPF2 value off by 1% to 2% from AHRI Certificate, supporting documentation, or conversion calculation. Modeled COP value off by 5% to 10% from AHRI Certificate or supporting docs.
• Modeled output capacity off by 2 kBtu/h to 5 kBtu/h from AHRI Certificate or supporting docs
• If relevant, modeled EAE off by 10 kWh to 25 kWh from AHRI Certificate or supporting docs
• Incorrect fan motor type modeled
• % Heating Load Served off by 2% to 5%
• Incorrect location identified for Heating System

Major Heating Modeling Errors:

• Incorrect equipment type identified
• Incorrect fuel type identified
• Modeled HSPF/HSPF2 off by greater than 2% from AHRI certificate, supporting documentation, or conversion calculation
• HSPF2 not properly converted to HSPF or the improper HSPF/HSPF2 dropdown was selected in the building model
• HSPF value from supporting documentation is modeled as HSPF2 value.
• Modeled AFUE value off by greater than 2% from AHRI Certificate or supporting docs.
• Modeled COP value off by greater than 10% from AHRI Certificate or supporting docs.
• Modeled output capacity off by greater than 5 kBtu/h from AHRI Certificate or supporting docs
• If relevant, modeled EAE off by greater than 25 kWh from AHRI Certificate or supporting docs
• % Heating Load Served off by greater than 5%