Broan BLP150E75NS-HW User's And Installer's Manual page 22

8. INSTALLER'S TROUBLESHOOTING (CONT'D)
W D
arning Escription
W22 Right blower airflow
W32 Left blower airflow
W52 Initial setting
incomplete
W61 Electronics
overheating
protection mode
W65 Flow direction
selector
LCD does LCD connection
not light
up
Frost prevention
AHU Furnace
synchronization
NOTE: If LED on unit is constantly lit, it is the filter maintenance indicator. If LED is blinking, there is an error so check LCD for error
code. With the rubber cover on, only the LED is visible. To see LCD, remove the rubber cover.
Make sure that no piece of mineral wool will enter in the unit during installation. Otherwise, this could reduce airflow and generate
vibrations and noise in the unit.
STEP 1: Perform a visual inspection of the supply damper system. Clean filters, distribution
registers and outside supply hood. Inspect ducting to ensure it is not squeezed or bent.
If STEP 1 did not fix the problem, perform STEP 2: Remove ducting of the supply path. On the
LCD screen, select MAX to check if the unit is able to reach the selected flow. If so, review the
ducting path.
If STEP 2 did not fix the problem, perform STEP 3: On the LCD screen, select the MIN and
MAX flow setting values then reset the unit. MAX flow value will display on the LCD screen. If
MAX flow is above desired MAX flow, set MAX and MIN flows.
If STEP 3 did not fix the problem, perform STEP 4: Replace the supply blower and repeat STEP 3.
If STEP 4 did not fix the problem, perform STEP 5: Replace the electronic assembly.
STEP 1: Perform a visual inspection of the exhaust damper system. Clean filters, distribution
registers and outside exhaust hood. Make sure no non-return damper is installed in exhaust
hood since it can freeze in winter. Inspect ducting to ensure it is not squeezed or bent.
If STEP 1 did not fix the problem, perform STEP 2: Remove ducting of the supply path. On the
LCD screen, select MAX to check if the unit is able to reach the selected flow. If so, review the
ducting path.
If STEP 2 did not fix the problem, perform STEP 3: On the LCD screen, select the MIN and
MAX flow setting values then reset the unit. MAX flow value will display on the LCD screen. If
MAX flow is above desired MAX flow, set MAX and MIN flows.
If STEP 3 did not fix the problem, perform STEP 4: Replace the exhaust blower and repeat
STEP 3.
If STEP 4 did not fix the problem, perform STEP 5: Replace the electronic assembly.
STEP 1: Press + or - to access the selection menu.
STEP 2: Complete configuration. (Refer to section 5 for more details).
The unit is currently in overheating protection mode. The power transmitted to the motor is
deliberately reduced to decrease electronics temperature. The unit will exit this mode by itself
once conditions are back to normal. It is normal to observe reduction in airflows during this
period. This condition should appear only when the unit is set in high speed and located in a
warmer environment, for example over 30°C (86°F).
Flow selector is probably set in the wrong direction. The red selector must be set on the side
of the outdoor ducting (Duct connected with the outside of the dwelling).
STEP 1: Open electric cover and check LCD wire connectors to ensure they are both well
connected (At each end of the white wire connected behind the LCD).
This is not an error. It indicates a flow unbalancing for frost prevention. The unit will exit this
mode by itself once conditions are back to normal.
This is not an error. If unit is set in installation type T2 or T4 and the speed setpoint is below 40
CFM, this AHU + CFM target will appear on LCD. In this status, the blowers can remain off for
a certain period of time waiting for synchronization with furnace (time base running to achieve
the targeted CFM level).
CAUTION
22
s
olution