Broan HRV200 ECM Installation Manual page 22

7. BALANCING THE UNIT (
7.5 B P
ALANCING ROCEDURE
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 Fresh
in. w.g. CFM
0.31 152
0.32 156
0.33 159
0.34 162
0.35 165
0.36 168
0.37 171
0.38 174
0.39 177
0.40 180
0.41 183
0.42 186
0.43 189
0.44 193
0.45 196
0.46 199
0.47 202
0.48 205
0.49 208
0.50 211
0.51 214
0.52 217
0.53 220
0.54 223
0.55 226
I Adjust stale air TURBO speed (or press % HUM key to keep it as is).
NOTE: The following shown values are example. The real values vary according to the preset speed chosen, the unit
installation, etc.
TURBO
Take the reading
from stale airflow
pressure taps.
' )
CONT D
( ' )
CONT D
Stale
CFM
155
159
162
166
169
172
176
179 STALE reading
value with its
183
corresponding
186
CFM
189
193
196
200
203
FRESH reading
206
value with its
210
corresponding
213
CFM
217
220
223
227
230
234
237
MODE
OR
TURBO
Press on MODE key to
raise the value.
Press on TURBO key to
lower the value.
NOTE: At first airflow readings, for speed value 01, both stale and fresh airflow
values displayed on control screen are 100%.
Before airflow adjustment
STALE airflow
reading:
0.41 in. w.g.,
189 CFM
FRESH airflow
reading:
0.50 in. w.g.,
211 CFM
TURBO
TURBO
Check the magnehelic
gauge along with the unit
balancing chart until the
desired airflow is reached.
22
After airflow adjustment
TURBO
TURBO
TURBO
TURBO
In that case, the FRESH
airflow must be lowered
to reach the STALE
airflow value.
Write selected
airflow percentage
on label affixed on
the unit for future
reference.
STALE airflow
reading:
0.41 in. w.g.,
189 CFM
FRESH airflow
reading:
0.43 in. w.g.,
189 CFM
% HUM
Press % HUM key
to accept chosen
percentage.