Bryant HRVBBSHA, HRVBBLHA, HRVBBSVA manual Methods to Size HRVs

Physical data (continued)

Model	HRVBBLHA1150	HRVBBLHA1250	HRVBBSVA1100	HRVBBSHA1100
Capacity—CFM @	130---168	191---210	99---107	99---107
0.5-0.3ESP (in. wc)
Efficiency (Sensible)—Percent	65	65	66	66
32_F (0_ C)
	65	60	66	66
--13_F (--25_ C)
Efficiency (Latent)—Percent
@ all temperatures	0	0	0	0
Heat Core Exchange Area—
cu ft (cu m)	120 (3.4)	166 (4.7)	55 (5.1)	55 (5.1)

Model	HRVBBLHA1150	HRVBBLHA1250	HRVBBSVA1100	HRVBBSHA1100
Voltage	120	120	120	120
Max Power — watts	150	218	150	150
Max Amps	1.4	1.9	1.3	1.3

Methods to Size HRVs

Method 1:

1.Calculate cubic feet of occupied space

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

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

Example: 2000 sq ft with 8 ft ceiling 0.35 air changes per hour (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 bathrooms times 20 CFM/each

3.Add 25 CFM for kitchen

Example: 2 people

2bathrooms

1kitchen

(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

Outside Temp	Heat Load (BTUh)
	@ Inside Design
°F	Temp 72°F
	HRVBBLHA1150
–25	4,688
–20	4,466
–15	4,598
–10	4,334
–5	4,069
0	3,805
5	3,541
10	3,502
15	3,220
20	2,938
25	2,950
30	2,636
35	2,322
40	2,009

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 HRVBBLHA1250 is 8417 BTUh. This additional load should be taken into consideration when sizing the heating equipment.

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