Broan B33DHW Installation & Operation Instructions

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Installation & Operation Instructions 800.558.1711

The B33DHW has an illuminated display, user selectable setpoint, and a power ON / OFF button located behind

the diuser. The diuser is fastened with tamper resistant screws to limit access to the control. The diuser can

also be fastened with the included phillips screws if limiting access to the control is not needed.

When turning power on for the rst time, the set point will be at the factory setting of 55% RH. In the event of

a power outage, the dehumidier restarts at the previous set point when power is restored.

Pressing the middle button (the power button), the control will toggle the B33DHW to turn ON or OFF.

If the unit is on and power button is pressed, control will turn compressor and fan o. As a result, both DISPLAY

and LED will go o.

If the unit is o and power button is pressed, control will turn fan on. As a result, both DISPLAY and LED will

go on.

If there is an error, the unit will shut down and indicator LED will turn to red and display will show an error code

(see page 13 for error codes).

Sequence of Operation

1. Press the ON / OFF button to turn the dehumidier control on. The display will show “00” for a couple of

seconds and then it will display the RH level of the room and the dehumidier blower will turn on to start

sampling the air for one minute.

Indicator LED, located above display, will be green, showing the unit is operating normally.

2. Pressing either of the arrow keys will cause the DISPLAY to ash and indicate the current set point. The RH set

point can be adjusted from a minimum of 35% to a maximum of 99% in 1% increments. Adjust the humidity set

point as desired. The recommended initial setting is 55%.

Pressing the DOWN arrow key below the 35% set point on the control will cause the display to read “00” and

the B33DHW will run continuously. After 10 seconds, it will go back to display room RH level.

Ten seconds after making an adjustment, from either UP or DOWN arrow keys, the display will go back to show

the room RH level.

3. If the sensor detects a reading above the set point, it will run the fan to sample the return air for a period of one

minute. The sampled humidity of the return air will be compared to the RH setting. If the humidity is above the

setting, the dehumidier compressor turns on. The compressor remains on until the measured humidity falls 3%

below the RH setting. If the sampled humidity is below the setting, the compressor and blower turn o and the

display returns to showing the RH setting. The dehumidier will sample again every 15 minutes.

CONTROLS

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Broan B33DHW 33 Pint Dehumidifier