calculating service size
- Thread starter wyboy
- Start date
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jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
If you are thinking of applying 220.51 or 220.53 to a heat pump, I would say that it is not allowed.
standard service calculation
standard service calculation
For a standard service calculation, 220.51 requires space heating loads to be calculated at 100 percent of the connected load if a heat pump is considered space heating. 220.53 allows a demand factor of 75% if a heat pump is an appliance load. So is a heat pump an appliance load or space heating load?
standard service calculation
For a standard service calculation, 220.51 requires space heating loads to be calculated at 100 percent of the connected load if a heat pump is considered space heating. 220.53 allows a demand factor of 75% if a heat pump is an appliance load. So is a heat pump an appliance load or space heating load?
- Location
- Connecticut
- Occupation
- Engineer
220.53 says you can take 75% of four or more appliances OTHER THAN space-heating equipment or air conditioning equipment.
You cannot apply 75% to a heat pump.
apprntice
Member
- Location
- Modesto, CA
If you look on 220 Part IV, as per 220.82(c) you can use 100% of the nameplate rating of the heat pump, or 100% + 65% if any supplemental electric heating.
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