Bryant ERVBBLHU1150, Installation, Start-Up, And Operating Instructions Manual, Page: 5 / 16

The purpose of the interlock relay kit is to energize indoor system
equipment (furnace or fan coil) blower whenever ERV is calling.
If ERV is energized, and indoor system equipment is not, interlock
relay will energize and make R and G at indoor equipment. This
will insure fresh air distribution throughout the building via the
central duct system.
II. 20 MINUTE TIMER
A push button timer can be used to override the wall control and
put ERV into high speed for 20 minutes. Connect switches in
parallel and connect leads to ERV terminals I, OC, and OL. (See
Fig. 10) Push button locations are ideal in special activity areas,
such as bathrooms, or kitchens, where high-speed exhaust opera-
tion is needed for a short period of time.
NOTE: The 20 minute timer will not function properly unless
ERV wall control is applied and working correctly. Timing
function is internal to electronic circuit board. It is activated by a
momentary contact between OC and OL. The I connection is to
illuminate the push button. The maximum number of push button
timers that can be applied is 5.
III. 60 MINUTE ADJUSTABLE TIMER
A 60 minute adjustable timer can also be used to override wall
control and put ERV into high-speed operation for a select amount
of time. Connect timer in parallel with push button timers, or to
ERV terminals OC and OL (See Fig. 11).
The 60 minute timer will provide a minimum of 10 minutes, and
a maximum of 60 minutes of ventilation at high speed.
BALANCING ERV
Balancing intake and exhaust airflow is very important for proper
system operation and optimum performance when applying an
ERV. Unit balancing prevents a positive and/or negative pressure
within a home. Balancing the ERV is done by applying temporary
flow collars and adjusting the balancing dampers to the fresh air
intake and stale air exhaust ducts (See Fig. 12). Airflow is
temporarily determined by connecting a magnehelic gage to the
temporary flow collar (See Fig. 13). Both flow collars and
magnehelic gage are included in the accessory start-up balancing
kit.
Fig. 7–Exhaust Ventilation
INSULATED DUCT CONNECTING
FRESH AIR & EXHAUST TO
OUTSIDE
6
′
18
″
MIN
FURNACE
REAR
INLET HOOD
6
′
EXHAUST HOOD
18
″
ERV
A00111
NOTE: Supply & exhaust ducts have
internal balancing dampers
that must be adjusted.
GROUND LEVEL
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