moab88
Member
- Location
- West Virginia
- Occupation
- Journeyman Electrician
I'm currently doing a service upgrade for a duplex in West Virginia. I'm having trouble with my calculation once I get to the AC/Heat part. This is what I have so far.
924 sqft x 3 VA = 2,772 VA
Small Appliance -> 4 x 1500 VA = 6,000 VA (When I spoke to the inspector he told me including the 2 minimum branch circuits required, this does not include the Refrigerator. I'm assuming he means he wants the fridge on a dedicated circuit. I went ahead and added a dedicated circuit for a wall mounted microwave as well.)
**Please correct me if I'm wrong I might be misunderstanding the inspector when it comes to my calculations.**
Laundry -> 2 x 1500 VA = 3,000 VA (Inspector also mentioned the one required branch circuit does not include the washing machine.)
2,772 VA + 6,000 VA + 3,000 VA = 11,772 VA
11,772 VA - 3,000 VA = 8,772 VA
35% x 8,772 VA = 3,070.2 VA
3,070.2 VA + 3,000 VA = 6,070.2 VA General Lighting Load
Range = 10.2 kW -> Table 220.55 makes value 8,000 VA
Dryer = 30A / 240V = 7,200 VA
On top of the 3 - Zone Mini Split Unit, which I will link the specs, the homeowner wants to supplement with baseboard heating.
I went ahead and sized my baseboard heaters before I was told about the Mini Split so obviously some of these can be lowered or simply removed. The Mini Split Specs from Home Depot state that the Coverage Area is 1200 sq ft. Is this overkill with the baseboard heating?
For the sake of my question, let's assume we're using the mini split mentioned and 6 separate baseboard heating units.
Baseboard Heating (240v) = 6750 W Total
The information I've found on the Mini Split goes as followed:
Compressor -> RLA = 20A
Outdoor Fan Motor -> RLA = 0.9A
Minimum Current Amperage -> MCA = 25A
Cooling Input Power -> 670 ~ 3210 W
Heating Input Power -> 1400 ~ 3530 W
I'm not sure what numbers I'm supposed to used in my calculation and this is the first time I've had to size a service on my own. I've taken my trade school classes but they were basic example questions and I don't know how to account for this Mini Split. I know this is a lot please bare with me, I've been stressing about doing a good job and making sure everything is safe and to code for the homeowner.
Mini Split Specs (Column under Model # YN030GMFI22M3D on Page A: Outdoor Units)
Home Depot Link
924 sqft x 3 VA = 2,772 VA
Small Appliance -> 4 x 1500 VA = 6,000 VA (When I spoke to the inspector he told me including the 2 minimum branch circuits required, this does not include the Refrigerator. I'm assuming he means he wants the fridge on a dedicated circuit. I went ahead and added a dedicated circuit for a wall mounted microwave as well.)
**Please correct me if I'm wrong I might be misunderstanding the inspector when it comes to my calculations.**
Laundry -> 2 x 1500 VA = 3,000 VA (Inspector also mentioned the one required branch circuit does not include the washing machine.)
2,772 VA + 6,000 VA + 3,000 VA = 11,772 VA
11,772 VA - 3,000 VA = 8,772 VA
35% x 8,772 VA = 3,070.2 VA
3,070.2 VA + 3,000 VA = 6,070.2 VA General Lighting Load
Range = 10.2 kW -> Table 220.55 makes value 8,000 VA
Dryer = 30A / 240V = 7,200 VA
On top of the 3 - Zone Mini Split Unit, which I will link the specs, the homeowner wants to supplement with baseboard heating.
I went ahead and sized my baseboard heaters before I was told about the Mini Split so obviously some of these can be lowered or simply removed. The Mini Split Specs from Home Depot state that the Coverage Area is 1200 sq ft. Is this overkill with the baseboard heating?
For the sake of my question, let's assume we're using the mini split mentioned and 6 separate baseboard heating units.
Baseboard Heating (240v) = 6750 W Total
The information I've found on the Mini Split goes as followed:
Compressor -> RLA = 20A
Outdoor Fan Motor -> RLA = 0.9A
Minimum Current Amperage -> MCA = 25A
Cooling Input Power -> 670 ~ 3210 W
Heating Input Power -> 1400 ~ 3530 W
I'm not sure what numbers I'm supposed to used in my calculation and this is the first time I've had to size a service on my own. I've taken my trade school classes but they were basic example questions and I don't know how to account for this Mini Split. I know this is a lot please bare with me, I've been stressing about doing a good job and making sure everything is safe and to code for the homeowner.
Mini Split Specs (Column under Model # YN030GMFI22M3D on Page A: Outdoor Units)
Home Depot Link
