Bard T**H User Manual download pdf (Page 8)

Manual 2100-450L

Page 8 of 14

BLADE ADJUSTMENT FOR DESIRED

VENTILATOR AIR

The amount of ventilation air supplied by the

commercial room ventilator is dependant on four (4)

factors.

1. Return air duct static pressure drop.

2. Supply air duct static pressure drop.

3. Indoor blower motor speed.

4. Damper blade open position setting.

Refer to the graph below to determine the blade setting

necessary to achieve the ventilation air required for

each operating mode.

FACTORY DEFAULT SETTINGS ARE:

C**H T**H

T**S W**H

Potentiometer R1. 17 17

Potentiometer R2. 14 14

Potentiometer R3. 12 NA

For more accurate adjustment, use a owhood over

the intake opening to measure and adjust the airow

operation.

Potentiometer R1. Adjusts the airow during blower

operation only.

Potentiometer R2. Adjusts the airow during 1st stage

cooling or heating operation.

Potentiometer R3. Adjusts the airow during 2nd

stage cooling or heating operation.

Energize blower only mode and adjust #1

Potentiometer to desired airow.

Energize 1st stage cooling mode and adjust #2

Potentiometer to desired airow.

Energize 2nd stage cooling mode and adjust #3

Potentiometer to desired airow.

Minimum damper position when using CO

control

damper should be fully closed at 700 ppm or lower, if

not Potentiometer R7 can be adjusted clockwise (CW)

to close it. If it is fully closed at 700 ppm or lower, no

adjustments required.

GRAPH 1

C36H, C42H & W38H1 VENT AIRFLOW

CH3S1 Vent Airflow

100

200

300

400

500

600

700

0 5 10 15 20

Blade Position

Ventilation Airflow (cfm)

Stage 2

Stage 1

Ventilation

1 2 3 4 5 6 7 8 9 10 11 12 13 14

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Bard T**H User Manual Page 8

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