Operating instructions
8. CHECKING AND ADJUSTING
9. MAINTENANCE
WARNING: Improper installation, adjustment, alteration, service, maintenance, or use can cause carbon monoxide
poisoning, explosion, fire, electrical shock, or other conditions which may cause personal injury or property damage.
Consult a qualified installer, service agency, fuel oil supplier, or your distributor or branch for information or assistance. The
qualified installer or agency must use only factory-authorized and listed kits or accessories when modifying this product.
Failure to follow this warning could result in electrical shock, fire, personal injury, or death.
PROCEDURE 1—EXPLANATION OF MODEL NUMBERS AND RATING PLATE
Boilers with the same number of sections are identical to each other except for their firing rate. The firing rate is determined by nozzle size in oil
burner and oil pressure at nozzle.
Each model number has 3 possible firing rates depending on which nozzle is installed. The model number represents the largest possible output
for the unit. For example, a BW4BAH140AAAA has a maximum input of 140,000 Btuh. The rating plate for each model shows the three possible
firing rates. Boilers come shipped with the largest nozzle installed. By changing nozzles, the BW4BAH140AAAA firing rate can be changed to
91,000 or 105,000 Btuh input.
PROCEDURE 2—GENERAL INFORMATION
Boilers with the same number of sections are identical to each other except for their firing rate. The firing rate is determined by the nozzle size
in the oil burner and the oil pressure at the nozzle. For example, models BW4BAH091, BW4BAH105, and BW4BAH140 are the same boiler,
without a tankless coil, except for the firing rate of the oil burner. Models BW5BAH126, BW5BAH175 and BW4BAH210 are the same boiler,
with a tankless coil, except for the firing rate of the oil burner.
Fig. 2—Dimensional Drawing and Boiler Ratings and Capacities
Oil-Fired Hot Water Boiler Ratings
BOILER MODEL NO.
NO.
SEC
INPUT
*MBH
**HEATING
CAPACITY
*MBH
NET
I=B=R
RATING
*MBH
FIRING
RATE
+GPH
AFUE
++
MINIMUM
CHIMNEY
SIZE/HEIGHT
DIMENSIONS — (IN.)
WITH
TANKLESS
COIL
WITHOUT
TANKLESS
COIL
Area (In.) Height (Ft) A B C
BW5BAH091† BW4BAH091† 3 91 80 70 0.65 86.3 8 X 8 15 14-1/2 6 8
BW5BAH105 BW4BAH105 3 105 92 80 0.75 85.2 8 X 8 15 14-1/2 6 8
BW5BAH140 BW4BAH140 3 140 119 103 1.00 83.4 8 X 8 15 14-1/2 6 8
BW5BAH126† BW4BAH126† 4 126 111 97 0.90 86.0 8 X 8 15 17-3/4 6 9–5/8
BW5BAH175 BW4BAH175 4 175 150 130 1.25 83.9 8 X 8 15 17-3/4 6 9–5/8
BW5BAH210 BW4BAH210 4 210 178 155 1.50 82.4 8 X 8 15 17-3/4 6 9–5/8
BW5BAH168 BW4BAH168 5 168 147 128 1.20 86.5 8 X 8 15 21 6 11–1/2
BW5BAH245 BW4BAH245 5 245 209 182 1.75 83.6 8 X 8 15 21 6 11–1/2
BW5BAH280 BW4BAH280 5 280 236 205 2.00 82.0 8 X 8 20 21 6 11–1/2
*MBH = 1,000 BTU per hour, BTU = British Thermal Unit
**Heating Capacity based on 13 percent CO
2
with a —0.02 in. wc draft over fire, and a #1 smoke or less. Testing was done in accordance with the D.O.E. (Department of
Energy) test procedure.
+GPH = Gallons per hour oil at 140,000 BTU per gallon
++AFUE = Annual Fuel Utilization Efficiency based upon D.O.E. test procedure.
As an Energy Star Partner, the manufacturer has determined that this product meets Energy Star guidelines for Energy Efficiency.
† Field supplied factory accessory low fire kit required.
A96152
A
19
5
⁄
8
″
GAGE
36″
1
1
⁄
4
IN.
RETURN
1
1
⁄
4
IN. SUPPLY
AQUASTAT
CONTROL
(WITHOUT COIL)
AQUASTAT
CONTROL
(WITH COIL)
TANKLESS
HEATER
1
⁄
2
IN. N.P.T.
9″
C B
3
⁄
4
IN.
ASME
RELIEF
VALVE
FRONT SIDE REAR
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