Carrier HRVCCLHU User Manual download pdf (Page 9)

Methods to size HRV’s

METHOD 1

1. Calculate cu ft of occupied space.

2. Multiply by recommended air changes per hr (AC/h).

3. Divide by 60 minutes per hr to convert to CFM.

EXAMPLE:

2000 sq ft with 8 ft ceiling

0.35 air changes per hr (AC/h)

(2000 sq ft x 8 ft ceiling x 0.35 AC/h) / 60 min/h = 93.3 CFM

METHOD 2

1. Multiply number of people times 15 CFM/person.

2. Multiply number of bath rooms 20 CFM/each.

3. Add 25 CFM for kitchen.

EXAMPLE:

2 people

2 baths

1 kitchen

(2 x 15) + (2 x 20) + 25 = 95 CFM

Additional heating and cooling load charts

Although the ventilators process the outside air before it enters the home, additional heating and cooling loads need to be

considered.

Heating load BTU

The heating load chart shows the heating loads in Btuh for a range of winter design temperatures for each model of ventilator.

EXAMPLE:

The heating design temperature for Milwaukee, WI is –4°F. At –5°F, the additional heating load of the

HRVCCLHU1250 is 8417 Btuh. This additional load should be taken into consideration when sizing the

heating equipment.

Outside

Temp °F

Heat Load (Btuh) @ Inside Design Temp 72°F

HRVCCLHU1150 HRVCCSVC1250 HRVCCSVC1150 HRVCCSVC1200 HRVCCLVU1150 HRVCCLVU1200 HRVCCLVU1330

–25

4,688 8,165 6,970 7,690 5,500 6,650 9,990

–20

4,466 7,744 6,470 7,090 5,030 6,070 9,310

–15

4,598 8,008 5,990 6,520 4,590 5,510 8,650

–10

4,334 7,547 5,520 5,970 4,160 4,970 8,000

–5

4,069 7,087 5,070 5,440 3,750 4,470 7,380

3,805 6,627 4,550 4,840 3,300 3,910 6,640

3,541 6,167 4,130 4,360 2,940 3,470 6,060

3,502 6,100 3,730 3,900 2,600 3,050 5,500

3,220 5,608 3,290 3,400 2,240 2,600 4,870

2,938 5,116 2,930 3,000 1,940 2,240 4,350

2,950 5,138 2,580 2,610 1,670 1,910 3,850

2,636 4,591 2,240 2,250 1,410 1,600 3,370

2,322 4,045 1,900 1,880 1,160 1,300 2,870

2,009 3,498 1,600 1,560 1,940 1,040 2,430

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Carrier HRVCCLHU User Manual Page 9

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