Bryant ERVBBLHU1150, Installation, Start-Up, And Operating Instructions Manual, Page: 6 / 16

If supply-air from outside is greater than exhaust-air from the
house, an imbalance can result over pressurizing the home. If
exhaust-air is greater than supply-air, combustion appliances may
backdraft, bringing exhaust fumes into the house. A balanced
condition will ensure optimum performance, provide satisfied
customers, and avoid expensive callbacks.
Before proceeding with balancing, all windows, doors, and fire-
place flues should be tightly closed. No exhaust system such as
range top exhausts, dryer exhausts, fume hoods, bath or roof fans
should be in operation. The forced-air furnace (if used for
circulation) should be operating in continuous fan mode for normal
operating speed.
I. BALANCING DAMPERS
Balancing dampers (sometimes called butterfly dampers) are
located in the fresh air intake and the stale air exhaust (See Fig. 12)
of the ERV.
II. FLOW COLLAR
Flow Collars are temporary, and should be installed as close to the
ERV as possible and in straightest sections of duct to ensure
accuracy (See Fig. 12). If only one flow collar is available, install
collar in stale-air duct of the ERV, and record airflow. Next, install
collar in the fresh-air duct and record airflow. If two flow collars
are available, it will be much easier to read airflow and properly
adjust dampers to balance unit.
With wall control at maximum speed (high-speed operation) and
furnace or fan coil on continuous fan, connect hoses to flow collar
to a magnehelic gage (See Fig. 13). When balancing the ERV
make sure all doors and windows are closed. All exhaust fans,
cooking ranges, and driers are turned off and the furnace or fan coil
blower is on. The gate must be leveled and zeroed before use to
read accurately. If needle falls below zero, reverse hose connec-
tions.
Fig. 8–Typical Wall Control
A00112
A00112
YELLOW
Y R G B
RED
GREEN
BLACK
Fig. 9–Control Connector
A98384
BLACK
CONTROL
CONNECTOR
OL
OC
IY
R
G
B
GREEN
RED
YELLOW
AIR EXCHANGE
OFF LOW
INTERMITTENT
ON
% RELATIVE HUM. EXT. TEMP.
21
°
C+ / 70
°
F+
10
°
C / 50
°
F
0
°
C / 32
°
F
60%
55%
45%
—6—