Specifications

Appendix K: Make-up Heat Requirements
Although the HRV600i, HRV700i and HRV1200i models
have good efficiencies, the supply air could be colder
than the ambient room air. It is possible to eliminate the
discomfort associated with this temperature difference by
installing an electric duct heater. This will temper the air
before it is distributed throughout the building. The table
below gives the heating requirements in kilowatts at dif-
ferent temperatures and airflows.
IMPORTANT
The data does not reflect a reduction in effectiveness due
to frosting. Based on the standard air at: 0.075 lb/ft
3
and
Cp = 0.24 Btu/lbm°F [1.2 Kg/m
3
and Cp = 1.0 KJ/Kg°C].
Table K1: Make-up Heat Requirements (kW) – HRV600i and HRV700i
Supply
Air
(CFM)
Supply
Air
(L/s)
Outdoor Air
−40°F [−40°C]
Outdoor Air
−22°F [−30°C]
Outdoor Air
−4°F [−20°C]
Outdoor Air
14°F [−10°C]
Outdoor Air
32°F [0°C]
Desired Air
Temperature
Desired Air
Temperature
Desired Air
Temperature
Desired Air
Temperature
Desired Air
Temperature
55°F
[13°C]
68°F
[20°C]
73°F
[23°C]
55°F
[13°C]
68°F
[20°C]
73°F
[23°C]
55°F
[13°C]
68°F
[20°C]
73°F
[23°C]
55°F
[13°C]
68°F
[20°C]
73°F
[23°C]
55°F
[13°C]
68°F
[20°C]
73°F
[23°C]
700 330 7.4 10.4 11.5 5.6 8.6 9.7 3.9 6.8 8.0 2.1 5.1 6.2 0.3 3.3 4.4
650 307 6.6 9.4 10.5 5.0 7.8 8.9 3.4 6.2 7.3 1.8 4.6 5.6 0.2 3.0 4.0
600 283 5.9 8.5 9.4 4.5 7.0 8.0 3.0 5.6 6.5 1.6 4.1 5.1 0.1 2.7 3.7
550 259 5.2 7.6 8.5 3.9 6.3 7.2 2.6 5.0 5.9 1.3 3.7 4.6 0.1 2.4 3.3
500 236 4.0 6.1 7.0 3.0 5.1 5.9 1.9 4.0 4.9 0.9 3.0 3.8 — 1.9 2.7
450 212 3.0 4.9 5.6 2.1 4.0 4.8 1.3 3.2 3.9 0.4 2.3 3.1 — 1.5 2.2
400 189 2.2 3.9 4.6 1.5 3.2 3.9 0.9 2.5 3.2 0.2 1.9 2.5 — 1.2 1.8
Table K2: Make-up Heat Requirements (kW) – HRV1200i
Supply
Air
(CFM)
Supply
Air
(L/s)
Outdoor Air
−40°F [−40°C]
Outdoor Air
−22°F [−30°C]
Outdoor Air
−4°F [−20°C]
Outdoor Air
14°F [−10°C]
Outdoor Air
32°F [0°C]
Desired Air
Temperature
Desired Air
Temperature
Desired Air
Temperature
Desired Air
Temperature
Desired Air
Temperature
55°F
[13°C]
68°F
[20°C]
73°F
[23°C]
55°F
[13°C]
68°F
[20°C]
73°F
[23°C]
55°F
[13°C]
68°F
[20°C]
73°F
[23°C]
55°F
[13°C]
68°F
[20°C]
73°F
[23°C]
55°F
[13°C]
68°F
[20°C]
73°F
[23°C]
1,250 590 14.6 19.9 21.9 11.2 16.5 18.5 7.8 13.1 15.2 4.4 9.7 11.8 1.0 6.3 8.4
1,200 566 13.5 18.6 20.6 10.4 15.5 17.4 7.2 12.3 14.3 4.0 9.1 11.1 0.8 5.9 7.9
1,150 542 12.6 17.4 19.3 9.6 14.5 16.4 6.6 11.5 13.4 3.6 8.5 10.4 0.7 5.5 7.4
1,100 675 11.2 15.9 17.7 8.5 13.2 15.0 5.8 10.5 12.3 3.1 7.7 9.6 0.4 5.0 6.8
1,050 495 10.7 15.2 16.9 8.1 12.6 14.3 5.5 10.0 11.7 2.9 7.4 9.1 0.4 4.8 6.5
1,000 472 9.9 14.1 15.7 7.4 11.7 13.3 5.0 9.3 10.9 2.6 6.9 8.5 0.2 4.4 6.1
900 425 8.5 12.4 13.8 6.4 10.2 11.7 4.3 8.1 9.6 2.2 6.0 7.5 0.1 3.9 5.4
800 377 7.0 10.4 11.7 5.2 8.6 9.9 3.4 6.8 8.2 1.7 5.0 6.4 — 3.3 4.6
700 330 5.0 8.1 9.3 3.7 6.7 7.9 2.3 5.3 6.5 0.9 3.9 5.1 — 2.5 3.7
VCES-HRV-IOM-1C – HRV600i, HRV700i, HRV1200i
38