Bryant ERVBBLHU1150, Installation, Start-Up, And Operating Instructions Manual, Page: 7 / 16

Measure exhaust air first. It is typically the lowest pressure due to
nature of system and ductwork. Next measure fresh air. If fresh air
reading is higher than exhaust reading, adjust damper until reading
is same. If reading is lower, return to exhaust damper and adjust to
obtain same reading. The label on flow collar can be used to
convert static pressure into airflow.
Once ERV is balanced and dampers are adjusted to equalize
airflow, use tape or drive screw to prevent damper blades from
moving. Remove flow collars and secure ducts. This procedure
should be repeated to ensure unit is balanced properly.
NOTE: The flow collar directional arrow (on flow collar) must be
oriented in the airflow direction of the unit.
NOTE:
Some field modification may be required to ensure proper
temporary installation of flow collar during balancing when
insulated flexible duct is used.
NOTE: For airflow pattern, see Fig. 14.
CAUTION: UNIT DAMAGE HAZARD
Failure to follow this caution may result in reduced unit
efficiency, capacity or unit life.
Do NOT use ERV during construction of a house or when
sanding drywall. This type of dust may damage system.
VENTILATION EVALUATION
When ventilation requirement is determined, use Product Data
Digests to reference unit airflow delivery and performance. The
ventilation capacity of an ERV unit while at maximum speed is
defined according to greatest total airflow required. These methods
are derived from the Canadian National Building Code 1990
version and the CSA F326.1 revision.
The following 2 methods can be used to evaluate the approximate
ventilation needs of a house. Accuracy of calculations are depen-
dent upon the information available and knowing critical measure-
ments of the structure (See Fig. 15).
METHOD 1
To calculate approximate ventilation or extend defrost for cold
climate conditions:
The sum of rooms X 10 CFM per room, plus 20 CFM for a master
bedroom or basement are required.
Example: 11 rooms X 10 CFM + 2 X 20 CFM = 150 CFM.
NOTE: The master bedroom and basement are not included in
first part of this equation, but figured in at second part of the
equation.
METHOD 2
To calculate approximate ventilation:
Referencing same example (See Fig. 15).
Fig. 10–Interlock Relay Wiring Layout
A05042
FOUR WIRE
TWO-WIRE
HEATING ONLY
TWO
WIRE
W BLK BLK
WHT WHT
GND
115V FIELD-
SUPPLIED
FUSED
DISCONNECT
NOTE: Connect Y-terminal as
shown for proper operation.
FURNACE
AUXILIARY
J-BOX
INDOOR UNIT
24V
TERMINAL BLOCK
THERMOSTAT
TERMINALS
INTERLOCK RELAY
GND
W
R
R
G
G
C
Y
Y
3
2
1
1
4
7 2
5
8 3
6
9
CONDENSING
UNIT
9-PIN AMP PLUG
120V FROM
VENTILATOR
C
TABLE 1–WALL CONTROL
MODE HUMIDITY LEVEL BOARD FUNCTION FAN SPEED INDICATOR LED’S
Off Any Off/Intermittent Off OFF
Low Below Setpoint Exchange High High Both ON
Above Setpoint Exchange Low Low
Intermittent Below Setpoint Exchange High High Both ON
Above Setpoint Off/Intermittent Off ON light on Exchange OFF
Below 23°F(-5°C) Any Defrost/Exchange High/Low Both ON
TABLE 2–MAXIMUM HUMIDITY LEVELS
OUTSIDE TEMPERATURE PERCENT RELATIVE HUMIDITY
70°F and Above 21°C and above 60 percent
50°F 10°C 55 percent
32°F 0°C 45 percent
—7—
→