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1818
For the Installer
F If the unit speed is set close to its highest speed, we recommend to first measure and note both airflows.
G Refer to the unit balancing chart to find the corresponding CFMs.
H Determine which airflow should be adjusted (the higher airflow must be lowered to equalize the lower one).
See example below.
Pressure
in. w.g.
Fresh
CFM
Stale
CFM
0.31 152 155
0.32 156 159
0.33 159 162
0.34 162 166
0.35 165 169
0.36 168 172
0.37 171 176
0.38 174 179
0.39 177 183
0.40 180 186
0.41 183 189
0.42 186 193
0.43 189 196
0.44 193 200
0.45 196 203
0.46 199 206
0.47 202 210
0.48 205 213
0.49 208 217
0.50 211 220
0.51 214 223
0.52 217 227
0.53 220 230
0.54 223 234
0.55 226 237
STALE reading
value with its
corresponding
CFM
FRESH reading
value with its
corresponding
CFM
In that case, the FRESH
airflow must be lowered
to reach the STALE
airflow value.
NOTE: At first airflow readings, for speed value 01, both stale and fresh airflow
values displayed on control screen are 100%.
TURBO
TURBO
Before airflow adjustment
After airflow adjustment
TURBO
TURBO
VQ0151
STALE airflow
reading:
0.41 in. w.g.,
189 CFM
FRESH airflow
reading:
0.50 in. w.g.,
211 CFM
STALE airflow
reading:
0.41 in. w.g.,
189 CFM
FRESH airflow
reading:
0.43 in. w.g.,
189 CFM
NOTE: The following shown values are example. The real values vary according to the preset speed chosen, the unit
installation, etc.
I Adjust stale air TURBO speed (or press % HUM key to keep it as is).
TURBO
TURBO
TURBO
Press % HUM key
to accept chosen
percentage.
% HUM
Press on MODE key to
raise the value.
Press on TURBO key to
lower the value.
MODE
TURBO
OR
Take the reading
from stale airflow
pressure taps.
Check the magnehelic
gauge along with the unit
balancing chart until the
desired airflow is reached.
Write selected
airflow percentage
on label affixed on
the unit for future
reference.
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