Ac Condenser

Status
Not open for further replies.
J

Jerseydaze

Senior Member
I have a house I'm bidding on and am looking to give a range price on the Ac condenser and blower. The size of the units are yet unknown. I ve always wired based on the name plate and am new to the estimating process my question is is there a Kw range based on ton IE 20 ton unit would use x KW a 30 ton would use etc.
 
Jerseydaze said:
I have a house I'm bidding on and am looking to give a range price on the Ac condenser and blower. The size of the units are yet unknown. I ve always wired based on the name plate and am new to the estimating process my question is is there a Kw range based on ton IE 20 ton unit would use x KW a 30 ton would use etc.
Click to expand...

how big is this house?:D
 
The ampacity of the compresser for a house will depend on the size and
seer of the unit. A 3 ton unit can be anywhere form 25 to 50 amps. The blower will be determined on weather you have a heat pump or a stright cool unit. 5kw heat for a heat pump is common, 15 to 20 kw for heat if electric heat strip. All Depends. Bid on the higher units and smile if they are smaller.
 
largest permissable unit here for res. is 5 ton always safe in bidding @ 10 amps per ton but the mca is usually lower. You can bet the location for condensors will be changed at least once.
 
480sparky said:
1 ton = 3.516 KW.

http://www.bry-air.com/tech-center/resources/conversion-tools/useful/default.html
Click to expand...

One ton of air conditioning is 12,000 BTU per hour, and 1 kW is 3413 BTU per hour, so one ton is the equivalent of 3.516 kW.

That is not the amount of power that is required to operate a 1 ton air conditioner.

The SEER is the seasonal average energy removed per unit of energy used, in Thousands of BTUs removed per kWHour. With a SEER of 12 that would mean an average power of 1 kW per ton.

That is not the connected load for a 1 ton air conditioner. There will be other conditions that define the required circuit capacity.
 
5.5 Amps per Ton?

5.5 Amps per Ton?

For some reason i seem to remember seeing 5.5 Amps per ton, using my Amp-Clamp (at 240 Volts). Do the potassium salt bridges in my cerebral cortex need dusting off, or is this value reasonable? :confused:
 
eric stromberg said:
For some reason i seem to remember seeing 5.5 Amps per ton, using my Amp-Clamp (at 240 Volts). Do the potassium salt bridges in my cerebral cortex need dusting off, or is this value reasonable? :confused:
Click to expand...

That is reasonable. That would be 1320 Watts at 240 Volts. 12,000 BTU/1320 Watts = 9 for an efficiency ratio. It might be a little low for circuit design but is certainly in the ball park.
 
mdshunk said:
If you like rules of thumb, I use 15 amps per every 600 conditioned square feet.
Click to expand...

Rules of thumb are great. Got lots of 'em.
15 Amps per 600 sq ft seems a little high. Is this Commercial? It seems like Residential might be about half this amount.
 
Status
Not open for further replies.
Top