Watts AERCO Benchmark OMM-0121 Operation And Maintenance Manual page 96

Benchmark 750-3000 Boiler Operation & Maintenance Manual
APPENDIX E: INDOOR/OUTDOOR RESET RATIO CHARTS
Header Temperature for a Building Reference Temperature = 90°F (32.2°C)
AIR TEMP
°F °C 0.6
90 32.2 90
85 29.4 93
80 26.7 96
75 23.9
99
70 21.1
102
65 18.3 105
60 15.6 108
55 12.8 111
50 10.0 114
45 7.2 117
40 4.4
120
35 1.7
123
30 -1.1 126
25 -3.9 129
20 -6.7 132
15 -9.4 135
10 -12.2 138
5 -15.0 141
0 -17.8 144
OMM-0122_D • GF-206 • 5/9/2019
0.8 1.0 1.2
90 90 90
94 95 96
98 100 102 104
102 105 108 111
106 110 114 118
110 115 120 125
114 120 126 132
118 125 132 139
122 130 138 146
126 135 144 153
130 140 150 160
134 145 156 167
138 150 162 174
142 155 168 181
146 160 174 188
150 165 180 195
154 170 186 202
158 175 192 209
162 180 198 216
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
RESET RATIO
1.4 1.6 1.8
90 90 90
97 98 99
106 108
114 117
122 126
130 135
138 144
146 153
154 162
162 171
170 180
178 189
186 198
194 207
202 216
210
218
2.0 2.2 2.4
90 90 90
100 101 102
110 112 114
120 123 126
130 134 138
140 145 150
150 156 162
160 167 174
170 178 186
180 189 198
190 200 210
200
210
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