Bryant ERVBBLHU1150, Installation, Start-Up, And Operating Instructions Manual, Page: 8 / 16

Total cu ft. X 0.3 per hr = total. Take total and divide by 60 to get
CFM.
Example:
1320 sq ft. x 8ft in height = 10560 cu ft house
10560 cu ft X 3 floors = 31680 total cu ft in house
31680 cu ft X 0.3 air change per fr = 9500 cu ft
9500 cu ft
÷
60 minimum per hr = 160 CFM
Conclusion: The total amount of airflow needed is 160 CFM. This
falls within airflow range of a ERVCCLHU1200 size unit.
CONTROL BOARD OPERATION
I. BOARD FUNCTION
To ensure proper operation of ERV, configuration jumpers are
located on electronic control board and must match configuration
setup shown on Fig. 16 under Jumper Table. Jumpers are factory
set and do not require any changes unless control board is replaced.
If control board is replaced, or unusual start-up operation is
encountered, check jumpers to make sure they are located properly
(See Fig. 16).
II. DEFROST
Defrost cycle is controlled by a thermistor which is located in the
fresh-air intake passage (the thermistor unit is connected to J4 of
control module (See Fig. 16). When defrost temperature sensor
detects the need for defrost, K5 relay will close for 6 minutes while
K1 and K2 remain energized.
This closes the outdoor air damper while running ERV blower on
high-speed. This process recirculates warm indoor air through heat
recovery core which melts any frost that has formed. Water created
in this process is collected by ERV and drained away. Frequency
of the defrost cycle depends on outdoor temperature (See Table 3).
III. OFF AND INTERMITTENT/OFF MODE
Whenever ERV is off, K1 relay is open (See Fig. 16).
IV. HIGH-SPEED AIR EXCHANGE
When high-speed air exchange occurs, K1 relay closes and K2
(12–vdc relay) is energized. This breaks low-speed contacts, and
closes high-speed contacts. Then, 115vac is applied between
orange and grey wires on Molex plug (pins 1 and 6) and motor
runs in high-speed operation. Also, 115vac is applied across pins
5 and 7, this energizes interlock relay (See Fig. 16).
Fig. 11–Push Button Timer Layout
A98386
3
4
5
I
OC
OL
YELLOW
BLACK
RED
ELECTRONIC CONTROL
BOARD
BACK OF PUSH BUTTON SWITCH
J3
J1
6
7
8
9
4 1 7
5 2 8
6 3 9
BLACK – (J3-4)
COMMON
TERMINAL
STRIP
YELLOW – (J3-3)
INDICATOR
TERMINAL STRIP
RED – (J3-5)
SWITCH
TERMINAL STRIP
BLACK – COMMON, (J3-4)
YELLOW – INDICATOR, (J3-3)
THE WIRES FROM THE SWITCH
RED – SWITCH, (J3-5)
(OC)
(I)
(OL)
(OPTIONAL)
60 MINUTE TIMER
(OPTIONAL)
PUSH BUTTON SWITCHES
(5 SWITCHES MAXIMUM)
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