Boiler Ratings & Capacities - Dunkirk Q90-125 Installation, Operation & Maintenance Manual

Figure 1 - Boiler Jackets
Input
Model
(MBH)
(1)
125 125
150 150
175 175
200 200
(1)
1 MBH = 1,000 Btuh (British Thermal Units Per Hour)
(2)
AFUE (Annual Fuel Utilization Effi ciency) and Heating Capacity is based on Department of Energy test procedure.
These low pressure gas-fi red hot water boilers are design certifi ed by CSA International, for use with natural and propane
gases. Boilers are constructed and hydrostatically tested for maximum working pressure of 50 psi (pounds per square
inch) in accordance with A.S.M.E. (American Society of Mechanical Engineers) Boiler and Pressure Vessel Code, Section IV
Standards for heating boilers.
Boilers are certifi ed in accordance with ANSI (American National Standards Institute) Z21.13 standards as gas-fi red, direct
vent, condensing, hot water boilers.
Heating Capacity indicates amount of heat available after subtracting losses up the stack. Most of this heat is available
to heat water. Small portion is heat loss from jacket and surfaces of boiler, it is assumed this heat stays in the structure.
Net AHRI Rating represents portion of remaining heat applied to heat radiation or terminal units (i.e. Finned tube
baseboard, cast iron radiators, radiant fl oor, etc.). Difference between Heating Capacity and Net AHRI Rating, called piping
and pickup allowance, establishes reserve for heating volume of water in the system and offsetting heat losses from
piping. Net AHRI Ratings shown are based on piping and pickup factor of 1.15. Net AHRI Rating of boiler selected should
be greater than or equal to calculated peak heating load (heat loss) for building or area(s) served by boiler and associated
hot water heating systems. Manufacturer should be consulted before selecting boiler for installations having unusual
piping and pickup requirements.
1 -BOILER RATINGS & CAPACITIES
Table 1 - SEA LEVEL RATINGS (NATURAL AND PROPANE GASES)
Heating Capacity Net AHRI Rating
(MBH)
(1)(2)
113
134
158
180
Shipping
(MBH) Weight (lbs.)
(1)
98 284
117 284
137 284
157 284
3
AFUE
Flue Diameter
(2)
90.0 2" CPVC & 3" PVC
90.0 2" CPVC & 3" PVC
90.0 2" CPVC & 3" PVC
90.0 2" CPVC & 3" PVC