Dunkirk 90-50 Installation, Operation & Maintenance Manual page 7

Altitude in Ft.
Normal Input (MBH)
Manifold Pressure In W.C.
Orifice
Altitude in Ft.
Normal Input (MBH)
Manifold Pressure In W.C.
Orifice
* For model 90-75 LP units only at altitudes above 5,000 ft., install 90-75 High Altitude Orifice Kit #550001810. For all other alti-
tudes use factory installed orifice.
Altitude in Ft.
Normal Input (MBH)
Manifold Pressure In W.C.
Orifice
++Contact local gas utility or distributor for Btu value of gas.
boilers for use aT HigH alTiTude
NOTICE
For model 90-75 LP units only at altitudes
above 5,000 ft., install 90-75 high Altitude
Orifice Kit #550001810*. For all other
altitudes use factory installed orifice.
TABLE #2: SERIES 90 PROPANE GAS
SERIES 90-50
Stock Factory
Settings 2300
0-5,000
50 –
2.5 3
43331095
SERIES 90-75*
Stock Factory
Settings 2300
0-5,000
75 –
2.5 3.5
43331093
SERIES 90-100
Stock Factory
Settings 2300
0-5,000
100
–
2.5 3
43331091
7
Btu Value of LP Gas++
2350 2400
5,000-10,000
– –
3 2.5
43331095
Btu Value of LP Gas++
2350 2400
5,000-10,000
– –
3.5 3.5
43331096*
Btu Value of LP Gas++
2350 2400
5,000-10,000
– –
3 3
43331091
2450 2500
– –
2.5 2.5
2450 2500
– –
3 3
2450 2500
– –
2.5 2.5