Additional Pages of Load Calc

Additional Pages of Load Calc

Additional Pages of Load Calc

Additional Pages of Load Calc

TMI

What is your location? I see you are in Allentown, Pa.

Everything points to a 2.5 ton system but with full cooling BTUs. If you go up in size to a 3 ton, it is quite probable that modifications to your ductwork system will be required to handle the extra CFMs. How many returns do you have and how do you filter your return air?

The obvious question is since you are replacing a 2 1/2 ton system, how did it perform especially in cooling?

What size heat strip do you have now?

Here is a suggested Trane system you might consider looking at. Same available from sister company Am Standard.

5270059 Active Systems TRANE XR13 WEATHERTRON TRANE 4TWR3030C1 *AM7A0C36H31 1025 32200 13.00 15.50 29000 9.00 16500 1 HRCU-A-CB 258 662 Yes

IMO

This post was edited by tigerdunes on Sun, Nov 30, 14 at 7:40

Tiger dunes

We have 5 returns and filter return air at the AHU using 1" pleated filter. For new unit we are considering stepping up to an Aprilaire air purifier.

The current system performs adequately for cooling, except for hall at top of stairs which I think is due to lack of supply and return registers (they are in the adjoining bedrooms).

We currently have a 10kw heat strip.

If possible, you should add a return to the upstairs hall. BR doors should be left open or at least cracked to get some air movement.

This issue is not related to the your HVAC system but your ductwork design/sizing.

IMO

Someone went to a lot of trouble and expense to produce that room-by-room Wrightsoft calculation for you, probably a serious contractor.

According to the calculation, you would need a 2-1/2 ton HP if single speed and perhaps 3-ton if variable speed for full-load heating capacity and still have properly sized cooling.

My choice would be for a Carrier Infinity or Carrier Infinity Greenspeed system.

IMO

SR

I certainly would run some numbers on the Greenspeed. I doubt strictly on a reasonable payback that a Greenspeed could be justified versus a conventional high eff air source HP system.

IMO

We are currently considering the Trane XR15 and XL15i units (single stage, variable speed) to take advantage of the EDD that the Carrier units do not have.

Great choices no doubt but if you are looking for a system offering a lot of bang for the buck, then the XR13.

5270059 Active Systems TRANE XR13 WEATHERTRON TRANE 4TWR3030C1 *AM7A0C36H31 1025 32200 13.00 15.50 29000 9.00 16500 1 HRCU-A-CB 258 662 Yes

Look at the numbers, all outstanding. Compare the cost to the XR15 and XL15i systems not to mention their performance/eff numbers to above.

10 KW heat strip and HW Mdl 8321 thermostat.

IMO

5270059 Active Systems TRANE XR13 WEATHERTRON TRANE 4TWR3030C1 *AM7A0C36H31 1025 32200 13.00 15.50 29000 9.00 16500 1 HRCU-A-CB 258 662 Yes

5198250 Active Systems TRANE XR15 WEATHERTRON TRANE 4TWR5030G1 *AM7A0C36H31 1050 32200 13.00 16.00 30000 9.00 18700 1 HRCU-A-CB 250 662 Yes

5021599 Active Systems TRANE XL15I WEATHERTRON TRANE 4TWX5030B1 *AM7A0C36H31 1050 33400 13.50 16.00 30000 9.50 18700 1 HRCU-A-CB 259 627 Yes

IMO