57
Bell
fi res
Installation instructions
TECHNICAL DETAILS
APPLIANCE RATINGS
Derby Large Tunnel 3 CF (Centre fi re)
Gas
Natural gas
Propane
Thermal effi ciency
[%]
83.2
84.2
Annual fi replace
effi ciency
[%]
76.4
78.0
Input maximum
Btu/hr
40,000
29,000
Input minimum
Btu/hr
7,200
6,800
Supply pressure
in. w.c.
7.0
11.0
kPa
1.74
2.74
Manifold pressure
maximum (hot)
in. w.c.
5.20
10.8
kPa
1.30
2.69
Manifold pressure
maximum (cold)
in. w.c.
5.10
10.8
kPa
1.26
2.69
Manifold pressure
minimum
in. w.c.
0.20
0.40
kPa
0.05
0.10
Main burner Injector marking
(back)
Nr. 200 (=1xØ2.00 mm)
Nr. 95 (=1xØ0.95 mm)
Main burner Injector marking
(front)
Nr. 200 (=1xØ2.00 mm)
Nr. 125 (=1xØ1.25 mm)
Pilot Injector marking
Nr. 36 (SIT 0.977.091)
Nr. 23 (SIT 0.977.150)
