INSTALLATION
CAUTION:
UNIT DAMAGE HAZARD
Failure to follow this caution may result in reduced life of
this unit.
Do not install ERV in a corrosive or contaminated
atmosphere.
I.
MOUNT UNIT
The ERV can be suspended from floor joists or rafters using chains
and 4 springs. Attach a metal hanging bracket to all 4 sides of the
cabinet (See Fig. 4). The unit may be installed on a shelf, if an
isolation pad is provided to dampen vibration. Unit should always
be installed as level as possible.
II.
INDEPENDENT SYSTEM APPLICATION
In the absence of a forced-air system and a typical duct system
layout, the ERV can be applied as an independent stand alone unit.
To ensure comfort, this type of application involves running both
fresh-air, and return-air registers (or stale-air pick-up registers)
throughout the home.
CAUTION:
CARBON
MONOXIDE
POISONING
HAZARD
Failure to follow this warning could result in personal
injury or death.
Do not install return-air registers (or stale-air pickup
registers) in same room as gas furnace or water heater
Fresh-air registers are normally located in bedrooms, dining
rooms, living rooms, and basements. It is recommended that
registers be placed 6 to 12 in. from the ceiling on an interior wall
and airflow directed towards ceiling. If registers are floor installed,
airflow should be directed toward the wall.
Return air (or stale-air pickup registers) are normally located to
draw from kitchen, bathroom, basement, or other rooms where
stale-air can exist.
Proper size and type of registers must be used to minimize pressure
drop. The velocity of airflow through register should not be above
400 feet per minute.
Maximum length of duct for the system should be designed
according to the highest speed of the unit. Refer to specifications
listed in unit Product Data Sheet for ventilation capacities.
III.
FORCED-AIR APPLICATION
Most ERV applications will be installed in conjunction with new
or existing forced-air systems. To operate properly, the fresh-air
supply and stale-air return from ERV connect directly to return-air
duct system. This is how the ERV distributes fresh air and removes
stale air from inside of the building (See Fig. 7). For these
installations, furnace or fan coil blower must be interlocked and
operate continuously whenever ERV is energized.
Interlock relay kit Part No. KVAAC0101VIR is available and
designed to interlock ERV with indoor equipment blower. When
ERV is energized, R and G circuit inside of furnace or fan coil will
energize. See Fig. 10 and interlock relay kit for additional
information and Installation Instructions.
NOTE:
The fresh air from ERV is introduced into return-air duct
at a point no less than 6 ft upstream of furnace or fan coil. This
connection should be direct (See Fig. 7). This is to allow incoming
fresh-air to mix before entering indoor equipment.
IV.
CONNECT DUCTS TO ERV
CAUTION:
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in minor
property damage from sweating duct or loss of unit
efficiency and capacity.
ERV should be installed in a conditioned space with
insulated flex duct for supply and exhaust air to the
outdoor ambient.
Insulated flexible duct is required on both fresh-air inlet and
exhaust-air outlet ducts connecting to exterior wall. When using
insulated flexible duct, the vapor barrier of the flexible ducts must
be taped very tight to prevent condensation problems. To reduce
pressure drop, stretch the flex duct and support it in a proper
manner to avoid reduced airflow.
When connecting the ERV to a return-air duct system, insulated
flexible duct can be used. However, when metal or rigid ducts are
applied use approximately 18–in. of flexible duct at ERV ports for
fresh-air supply, and stale-air return (See Fig. 6). This can act as a
silencer when connecting ducts to return-air duct system. This
should eliminate transmission of noise or vibration from unit to
main duct system. In addition, there are four 30–in. duct ties
provided to help fasten flexible duct to port on ERV.
V.
LOCATE AND INSTALL EXTERIOR HOODS
IMPORTANT:
To prevent condensation problems, insulated
flexible ducts are required on both fresh-air inlet and exhaust-air
outlet ducts connecting between ERV and exterior wall.
Fresh-air intake and stale-air exhaust must be separated by at least
6 ft. Fresh-air intake must be positioned at least 10ft. from nearest
dryer vent, furnace exhaust, driveway, gas meter, or oil fill pipe.
Fresh-air intake must be positioned as far as possible from garbage
containers and potential chemical fumes. When possible, it is
advised to locate the intake and exhaust hoods on same side of
house or building. The intake and exhaust hoods should never be
located on interior corners or in dead air pockets. (See Fig. 7) Both
intake and exhaust hoods must be 18 in. from ground and at least
12 in. above anticipated snow level.
After selecting proper hood locations, make appropriate size hole
through exterior wall, pass flexible duct through hole and insert
hood tube into duct. Tape duct vapor barrier tightly around hood
tube and insert assembly back into wall and fasten securely.
Fig. 4–Chain Spring Installation
A92269
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