29
Air Flow Balancing using the Door Ports
FC155HRV & FC200HRV only
Door balancing ports (not on all models) are designed to be used in
conjunction with a Magnehelic Gauge or Digital Manometer to
measure the Stale and Fresh airflows for balancing.
Step 1
Prepare the air flow measuring device (i.e. Magnehelic Gauge or
Digital Manometer) by connecting the hoses to the low and high
pressure side of the gauge.
Step 2
Insert the hoses into the rubber fittings from the optional Door Port
Adapter Kit (part # 99-182). Use light pressure and rotate until
fitting is snug. Do not extend the hose past the rubber fitting.
Step 3
Open the HRV Door. Remove the 4 Door Port Covers by carefully
pushing them out from the back side of the door (use the blunt end
of a large drill bit etc.).
Step 4
Close the HRV Door. Initiate power and operate the HRV on high
speed. Operate the forced air system on high speed (if the HRV is
connected to the forced air system) .
Step 5
Insert the 2 rubber fittings from the gauge to the STALE AIR
Balancing Ports (upper right and lower left). Seal the FRESH AIR
Balancing Ports (upper left and lower right) with tape. Record your
reading.
Step 6
Insert the 2 rubber fittings from the gauge to the FRESH AIR
Balancing Ports (upper left and lower right). Seal the STALE AIR
Balancing Ports (upper right and lower left) with tape. Record your
reading.
Step 7
Refer to the "Airflow Reference Chart" for your model and
determine the FRESH AIR and STALE AIR flow rates (the chart is
located on the lower portion of this page).
Step 8
Damper down the higher airflow and repeat Steps 5 to 7 as required
until both airflows are identical (balanced).
Step 9
Remove the tape and rubber fittings and reinstall the 4 Door Port
Covers.
MODEL 200
0 230
153
156
Manometer
Reading
Airflow Numbers
(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
0 230
.
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
0 180
142
129
Airflow Numbers
(CFM)
Pressure
(in. w.g.)
Fresh Air Stale Air
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
0 180
.
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
Fresh Air Stale Air
Magnehelic Gauge hoses connected to
STALE AIR balancing ports
Illustration of measuring STALE airflow using a Magnehelic Gauge.
Magnehelic Gauge hoses connected to
FRESH AIR balancing ports
Illustration of measuring FRESH airflow using a Magnehelic Gauge.
Fresh Air
Balancing Ports
(top-left,
bottom-right)
Stale Air
Balancing Ports
(top-right,
bottom-left)
Illustration of a door with door ports
Airflow Reference Charts
FC200HRV
FC155HRV
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