BENSON VRBD 250 - Page 33

NAT GAS / LPG MODEL 250 330 410 490
HEAT
OUTPUT
kW
Btu
72.0
246,000
96.0
328.000
120.0
409,000
144.0
491,000
HEAT INPUT
(Nett)
kW
Btu
78.8
268,900
105.2
359,000
130.4
445,000
156.5
534,000
EFFICIENCY % Nett 91.4 91.2 91.5 91.5
EFFICIENCY % Gross 82.3 82.1 82.4 82.4
HEAT
OUTPUT Low Fire
kW
Btu
46.6
159,000
62.2
212.250
77.5
264,430
93.0
317,300
HEAT INPUT
(Nett) Low Fire
kW
Btu
50.7
173,000
67.6
230,720
83.8
286,000
100.6
343,200
GAS CONNECTION BSP/Rc
3/4”
3/4” 3/4” 3/4”
MIN INLET
PRESS NAT GAS
mbar
Ins WG
17.5
7
17.5
7
17.5
7
17.5
7
BURNER
PRESSURE NAT GAS
mbar
Ins WG
8.7
3.5
8.7
3.5
9.2
3.7
9.2
3.7
BURNER PRESSURE
NAT GAS Hi Lo
Hi mbar
Lo mbar
8.7
3..5
8.7
3.5
9.2
3.8
9.2
3.8
MAIN INJECTOR
NATURAL GAS
mm
No Off
3.4
6
3.4
8
3.4
10
3.4
12
NAT GAS
CONSUMPTION
ft
3
/hr
m
3
/hr
294
8.33
393
11.12
490
13.87
587
16.63
MIN INLET
PRESS LPG
Mbar
Ins WG
37.0
14.8
37.0
14.8
37.0
14.8
37.0
14.8
BURNER
PRESSURE LPG
Mbar
Ins WG
25.5
10.2
25.5
10.2
25.5
10.2
25.5
10.2
LPG PROPANE
CONSUMPTION
m
3
/hr
Kg/h
3.21
5.94
4.28
7.92
5.34
9.88
6.41
11.86
MAIN INJECTOR
PROPANE GAS
Mm
No Off
2.0
6
2.0
8
2.0
10
2.0
12
TEMPERATURE
RISE
ºC
ºF
32
58
34
61
32
58
32
58
AIR
FLOW
ft
3
/min
m
3
/sec
4026
1.90
4789
2.26
6527
3.08
8010
3.78
VRABD
THROW
ft
mtrs
203
62
210
64
249
76
256
78
FAN STATIC
PRESSURE
Pa
Ins WG
150
0.60
180
0.72
200
0.80
200
0.80
SOUND LEVEL @ 3m Dba 61 63 66 66
FLUE DIAMETER * mm 130 130 130 130
COMBUSTION AIR DIA mm 130 130 130 130
SUPPLY VOLTAGE Axial 230/1/50 230/1/50 230/1/50 230/1/50
ELECTRICAL POWER(AMPERES) Axial 2.8 4.2 4.8 5.8
INTERNAL FUSE
RATING AMPERES
VRA 6 6 6 6
POWER ABSORPTION Kw Axial 0.56 0.88 0.95 1.2
MOUNTING HEIGHT
(MTRS)
Min
Max
2.4
3.5
2.4
3.5
2.4
3.5
2.4
3.5
GROSS FLUE TEMP ºC 150 150 160 160
WEIGHT Kgs Axial 181 203 242 279
AIR PRESS SWITCH mbar 1.65 1.65 1.65 1.65
FLUE
RESISTANCE
min mbar
max mbar
-0.2
+0.4
-0.2
+0.4
-0.2
+0.4
-0.2
+0.4
7.2 Technical Data