Dunkirk Q90-100 Series IV - Manual (Page 3)

3
6. Apply pipe dope to bushing threads. Install gas orifi ce
assembly turning clockwise into mixer. DO NOT USE
TEFLON TAPE.
7.
Attach adapter block to gas valve.
8.
75 MBH: Chose table for correct type of fuel supplied
to your boiler. Replace burner plate with plate listed in
correct table. Different burner plate is used for Nat and
LP fuels.
9.
Install top panel. Restore electrical and gas supply. Set
thermostat high enough to start boiler. Restart boiler.
Check for gas leaks using soapy water or commercial
leak detector.
10.
Fill out data on adjustment/conversion label. Attach to
inside left panel of boiler.
11.
Install front door.
Operate boiler through at least 6 ignition cycles to check for
proper operation of the boiler before leaving job site.
TABLE #2: PROPANE GAS
MODELS 050 MBH
Stock Factory Btu Value of Propane Gas++
Settings 2300 2350 2400 2450 2500
Altitude in Ft. 0-5,000 5,000-10,000
Normal Input (MBH) 50 – – – – –
Combustion Setting (CO
2
) 10.0 -11.1% (CO
< 100 ppm)
Orifi ce 43331095
Burner Plate 109006405
MODELS 075 MBH
Stock Factory Btu Value of Propane Gas++
Settings 2300 2350 2400 2450 2500
Altitude in Ft. 0-5,000 5,000-10,000
Normal Input (MBH) 75 – – – – –
Combustion Setting (CO
2
) 10.0 -11.1% (CO
< 100 ppm)
Orifi ce 43331093 43331096*
Burner Plate 109009107
* For model 075 LP units only at altitudes above 5,000 ft., install 075 MBH High Altitude Orifi ce Kit #5550002629 which includes
43331096 orifi ce.
MODELS 100 MBH
Stock Factory Btu Value of Propane Gas++
Settings 2300 2350 2400 2450 2500
Altitude in Ft. 0-5,000 5,000-10,000
Normal Input (MBH) 100 – – – – –
Combustion Setting (CO
2
) 10.0 -11.1% (CO
< 100 ppm)
Orifi ce 43331091
Burner Plate 109009105
++Contact local gas utility or distributor for Btu value of gas.
HIGH ALTITUDE RATINGS FOR PROPANE
Figure 3 - Gas Valve Adapter Detail