Operating instructions

Heater
Model
Mass Flow Rate of Flue
Gasses (kg/s)
VSXO20UT
0.0130
VSXO25UT
0.0139
VSXO30UT
0.0165
VSXO35UT
0.0167
VSXO40UT
0.0183
VSO15UT
0.0114
VSO20UT
0.0125
VSO25UT
0.0137
VSO30UT
0.0189
VSO35UT
0.0207
VSO40UT
0.0253
Flue Pressure (Pa)
Max Flue Resistance
19
13
33
7.5
35
6
19
28
29
24
28
Flue Gas Temp (°C)
185
205
180
185
220
165
190
225
205
235
240
VSO45UT
0.0253 26 210
VSO50UT
0.0257 27 220
VSXO45UT
0.0210 31 185
VSXO50UT
0.0224 10 195
Table 2. Induced VSO Herringbone Settings - Natural Gas (G20)
Table 3. Flue details - Natural Gas (G20)
Heater
Model
Cold HB Pressure Hot HB Pressure
mm H
2
O mbar mm H
2
O mbar
VSO20UH
18.4 1.8 10.2 1.0
VSO25UH
25.5 2.5 17.3 1.7
VSO30UH
14.3 1.4 10.2 1.0
VSO35UH
22.4 2.2 16.3 1.6
VSO40UH
20.4 2.0 17.3 1.7
VSO15UH
14.3 1.4 10.2 1.0
VSO45UH
33.6 3.2 22.4 2.2
VSO50UH
33.6 3.2 22.4 2.2