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AirFlow Balancing using the DoorPorts FC155HRV& FC200HRV only
Doorbalancing ports (not on all models) are designed to be used in
conjunctionwith a Magnehelic Gauge or Digital Manometer to
measurethe Stale and Fresh airflows for balancing.
Step 1
Preparethe air flow measuring device (i.e. Magnehelic Gauge or
DigitalManometer) by connecting the hoses to the low and high
pressureside of the gauge.
Step 2
Insertthe hoses into the rubber fittings from the optional Door Port
AdapterKit (part # 99-182). Use light pressure and rotate until
fittingis snug. Do not extend the hose past the rubber fitting.
Step 3
Openthe HRV Door. Remove the 4 Door Port Covers by carefully
pushingthem out from the back side of the door (use the blunt end
ofa large drill bit etc.).
Step 4
Closethe HRV Door. Initiate power and operate the HRV on high
speed.Operate the forced air system on high speed (if the HRV is
connectedto the forced air system) .
Step 5
Insertthe 2 rubber fittings from the gauge to the STALE AIR
BalancingPorts (upper right and lower left). Seal the FRESH AIR
BalancingPorts (upper left and lower right) with tape. Record your
reading.
Step 6
Insertthe 2 rubber fittings from the gauge to the FRESH AIR
BalancingPorts (upper left and lower right). Seal the STALE AIR
BalancingPorts (upper right and lower left) with tape. Record your
reading.
Step 7
Referto the "Airflow Reference Chart" for your model and
determinethe FRESH AIR and STALE AIR flow rates (the chart is
locatedon the lower portion of this page).
Step 8
Damperdown the higher airflow and repeat Steps 5 to 7 as required
untilboth airflows are identical (balanced).
Step 9
Removethe tape and rubber fittings and reinstall the 4 Door Port
Covers.
MODEL 200
0230
153
156
Manometer
Reading
AirflowNumbers
(CFM)
(in.w.g.)
0.100 98 91
0.110 102 96
0.120 107 101
0.130 111 107
0.140 115 112
0.150 120 117
0.160 124 122
0.170 128 127
0.180 133 132
0.190 137 137
0.200 141 142
0.210 145 147
0.220 149 152
0230
.
153
156
0.240 157 161
0.250 161 166
0.260 165 171
0.270 169 175
0.280 173 180
0.290 177 184
0.300 181 189
0.310 185 193
0.320 189 198
0.330 192 202
0.340 196 207
0.350 200 211
0.360 203 215
MODEL 155
0180
142
129
Airflow Numbers
(CFM)
Pressure
(in. w.g.)
FreshAir StaleAir
0.100 93 80
0.105 96 83
0.110 99 86
0.115 102 89
0.120 105 92
0.125 108 96
0.130 111 99
0.135 114 102
0.140 117 105
0.145 120 108
0.150 123 111
0.160 130 117
0.170 136 123
0180
.
142
129
0.190 148 135
0.200 154 141
0.210 160 147
0.220 166 154
0.230 172 160
0.240 178 166
0.250 184 172
0.260 191 178
0.270 197 184
0.280 203 190
0.290 209 196
0.300 215 202
0.310 221 209
Pressure
Manometer
Reading
FreshAir StaleAir
MagnehelicGauge hoses connected to
STALEAIR balancing ports
Illustrationof measuring STALE airflow using a Magnehelic Gauge.
MagnehelicGauge hoses connected to
FRESHAIR balancing ports
Illustrationof measuring FRESH airflow using a Magnehelic Gauge.
FreshAir
BalancingPorts
(top-left,
bottom-right)
Stale Air
Balancing Ports
(top-right,
bottom-left)
Illustration of a doorwith door ports
Airflow Reference Charts
FC200HRV
FC155HRV