18-HE58D1-5 5
Installer’s Guide
INSTALLATION GUIDELINES
GENERAL GUIDELINES
1) Do operate the ERV independent of the indoor cen-
tral heating and cooling blower system (furnace / air
handler). Independent operation of the ERV allows
the ERV to introduce the minimum required fresh
air at all times of the year.
2) Do Not set up a control system that requires the
indoor (furnace / air handler) blower for the heating
and cooling system to operate (when in the cooling
mode) when the ERV operates. Fan operation during
the cooling mode without cooling occurring is not
recommended under most circumstances and ap-
plications. Fan operation evaporates the condensed
moisture (water) on the cooling coil and results in
increased Relative Humidity inside the home. For
exceptions and additional details, see the ERV Ap-
plication Bulletin.
3) Humidifiers and ERV/HRV’s. When the “fresh air”
is ducted into the return duct and the system is to
have a humidifier, install a “fan power humidifier.”
Do not install a by-pass humidifier, as it can freeze
based on the installation, outdoor temperature and
homeowner thermostat setback requirements.
APPROVED INSTALLATIONS
I) Separate Room Exhaust Air Pick-Up / Fresh Ex-
changed outside air to central system return air
ERV
RA (Furnace)
Minimum 3'
Furnace
SA
EA
OA
FA
(example, from bathrooms,
dining area)
OA
RA
Figure 7
Legend
RA - Room Air
OA - Outside Air
FA - Fresh Air
EA - Exhaust Air
SA -Supply Air
Note: Entering mixed air temperature to furnace (fur-
nace heating air) must be above 50°F (18°C) to prevent
condensation in furnace heat exchanger.
II) Separate Return Air and Fresh Air Supply
RA
(example, from bathrooms,
kitchen area)
Furnace
RA (Furnace)
OA
ERV
EA
FA
Living area*
SA
Figure 8
Note: Introduce fresh air where good mixing will occur
to minimize discomfort to occupants.
NON APPROVED / NOT RECOMMENDED
INSTALLATIONS
I) Exhaust Air and Fresh Air Ducted To System Return
Air Duct
Minimum 3'
Furnace
SA
RA (to ERV)
OA
ERV
Minimum 3'
FA
Minimum 3'
FAFA
EA
RA (Furnace)
Figure 9
Note: Application requires indoor blower to be running
when ERV runs. This is in violation of General Guide-
line #2 on page 3.
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