using 220.84 in calcs

[dhsvcs]

I have a job where customer has a 450 sq ft 1 bedroom apt sharing a 8 meter meter center that is fused at 250 amps ( 240/120 1 phase ).
Present service is 60 amps ( gas range ), electric water heater.
He wants to install a mini-split with a horizontal canister in the hallway ( drop the hallway ceiling ) using a 12000 btu heat pump. ( draws less than 10 amps @240 v )
It is in Miami, so I am not to concerned about supplemental heat since unit will work down to 5 degrees F.
My question is ....when I do a load calc for the unit, do I need to add the "fake" 8000 va load for the apt making it tight for the load calc of the unit, or only for all 8 units
in the total load calc which is allowing me to use the 200.84 43% demand factor ?
The complex has a separate existing 100 amp service feeding the added laundry room with 2 washers and 2 dryers and small outside ltg circuit polaris tapped to the overhead service..
Thanx, DHSVCS

 

[dhsvcs]

rewritten to make more sense...

I have a job where customer has a 450 sq ft 1 bedroom apt sharing a 8 unit meter center that is fused at 250 amps ( 240/120 1 phase ).
Present service is 60 amps ( gas range ), with 3000 w electric water heater. ( 1 of 3 buildings)

He wants to install a mini-split with a horizontal canister in the hallway ( drop the hallway ceiling ) using a 12000 btu heat pump. ( draws less than 10 amps @240 v )

It is in Miami, so I Think I am not required to have supplemental heat since unit I am specifying will work down to 5 degrees F.
My question is ....when I do a load calc for the unit, do I need to add the "fake" 8000 va load for the apt making it tight for the load calc of the unit, or only for the total of all 8 units in the total load calc, which is allowing me to use the 200.84 43% demand factor ? It makes a difference in allowing me to install a microwave oven vs a hood fan.

The building has added a separate existing 100 amp service feeding the added " laundry room" with 2 washers and 2 dryers and small outside ltg circuit so I don't need a dryer or laundry circuit. Service is is polaris tapped to feed from the overhead service which I will need to repair, but it was installed with a permit. Trying to bring the meter "room" to current standards would get cost prohibitive..
For example, look at the main disconnect..

Thanx, DHSVCS

 

[dhsvcs]

Can't use anyhow...service is less than 100 Amps per unit..

 

[dhsvcs]

Can't use 220.84 anyhow...not because of 100 A size..don't think that makes a difference...but with such a small existing service, every amp is precious...It does not take long to fill up a 200 A disconnect for 8 apartments, even with no dryer and gas ranges..
BUT....7 of the apartments have 2 small in wall a/c units...
With a water heater, vent fan or microwave, and a refrigerator, if I add 1 small permanently attached load or am allowed to count the in wall ac's as a small appliance load, I can multiply the small appliance load by 75% and can utilize the existing service....
The in wall ac's share an existing circuit ( should be less than 7.5 amps if I remember right )..
That is if I calculate the water heaters at 3000 watts and the hood fans at 3 amps..
Not a job I am proud of....I put a request into FPL for a stand alone service....But the customer only owns 1 unit of 8 and does not want to rebuild the service for all 8 units..
I could also suggest a small mini-split with a ceiling cartridge that would allow for lowering the ceiling in the hallway and running ducts to the bathroom, bedroom and living room / kitchen at 22 seer for a reasonable cost and a low current draw....
Even a small 1.5 ton heat pump could be installed with a separate wall mount ahu at a reasonable price for the 1 unit..

Open for suggestion...
Thanx, dhsvcs

 

[Hv&Lv]

Not sure what questions You still have but..
Does Florida mandate supplemental heat? If it doesn't don’t include it in your calcs

 

[david luchini]

Can't use anyhow...service is less than 100 Amps per unit..

There's no 100A requirement in 220.84

 

[dhsvcs]

I noticed there was no 100 A requirement, but it was too late to "edit" my reply as it closed on me while writing...

The apartments have 2 through the block wall window units. One in the kitchen/living area and one in the bedroom. At present, there is no other cooling or heating. I am trying to add a central system to the apartment I am working on to replace the 2 wall units and replace the existing panel.

The 2 units each are not easily removable. If they are removed, the holes would have to be filled...

 

[dhsvcs]

I could also go with a high efficiency mini-split, version 3c...