Forced-Air Application; Connect Ducts To Hrv; Condensate Drain; Locate And Install Exterior Hoods - Bryant HRVBBLHU Installation, Start-Up, And Operating Instructions Manual

III. FORCED-AIR APPLICATION
Most HRV applications will be installed in conjunction with new
or existing forced-air system. To operate properly, the fresh-air
supply and stale-air return from HRV connect directly to return-air
duct system. This is how the HRV distributes fresh air and
removes stale air from inside of building (See Fig. 7). For these
installations, furnace or fan coil blower must be interlocked and
operate continuously whenever HRV is energized.
→
Interlock relay kit Part No. KVAAC0101VIR is available and
designed to interlock HRV with indoor equipment blower. When
HRV is energized, R and G circuit inside of furnace or fan coil will
energize. See Fig. 13 and interlock relay kit for additional
information and Installation Instructions.
NOTE: The fresh air from HRV 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 HRV
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.
If HRV duct work is installed in an unconditioned space,
insulated flexible duct is required.
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 HRV 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 HRV ports for
fresh-air supply, and stale-air return. When using metal duct from
fresh-air supply to system duct work, the metal duct should be
insulated (See Fig. 5). 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.
NOTE: Balancing dampers should be installed in stale air exhaust
and fresh air intake ducts before connecting to the HRVBBSVU
and the HRVBBLVU units. The balancing dampers are provided
in the HRVBBLHU units (see balancing HRV section).
V. CONDENSATE DRAIN
To connect condensate drain, proceed as follows:
1. Insert sleeved grommets into bottom of unit using the
gasket washer and nut (See Fig. 6).
2. Cut two sections of plastic tubing, about 12" long and attach
them to each drain.
3. Join the two short sections of plastic tubing to the "T"
connector and the main tube as shown.
4. Make a loop in the tubing below the "T" connector to create
a trap to prevent sewer gases from entering the ventilation
system (See Fig. 6).
5. Connect unit drain to building's main drain. Provide slight
slope from unit for run-off.
VI. 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 HRV 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 10 ft 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.
FLEXIBLE
DUCT
FRESH-AIR
SUPPLY
Fig. 5—Flexible Duct Fit-Up
Fig. 6—Condensate Drain With Loop Trap
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DUCTS CONNECTING TO
RETURN-AIR DUCT SYSTEM
STALE-AIR
RETURN
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