PD_Q20_CoolingSys 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. If installed, Rater/RFI verifies and documents the correct space cooling system(s) types, fuel types, locations and number of units. Rater/RFI verifies and documents the correct output capacities, efficiencies, cooling sensible heat fractions, heat pump fan power and heat pump energy.

• Air Handlers are part of the duct system. Make sure air handler locations are captured.
• Cooling fuels 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: Rater/RFI verifies and documents the correct well type, number of wells, well depth and loop flow.

SCORING:

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

Minor Cooling Verification Errors:

• SEER/SEER2/EER value off by 0.5 to 1.0 from AHRI certificate, supporting documentation, or conversion calculation
• 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 Veriification Errors:

• Incorrect equipment type identified
• Incorrect fuel type identified
• 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 is documented
• SEER value from supporting documentation is documented as SEER2 value
• Output capacity off by greater than 5 kBtu/h from AHRI Certificate or supporting docs
• % Cooling Load Served off by greater than 5%