Filter
Top Products
10) Flue Gas Temperature – The flue gas temperature will vary depending on
heat input rate, air temperature rise across the heat exchanger, and air
flowrate through the furnace. To prevent excessive water vapor condensation
from the flue gases, the gross flue gas temperature should not fall below
330ºF. In addition, if the gross flue gas temperature exceeds 650ºF, the
heating efficiency of the furnace will be reduced.
To reduce high flue temperatures, after properly adjusting the burner, check
for blocked supply/return airflow. Remove any blockages, increase fan
speed, or consider reducing the furnace heat input rate. Also, verify there is
no air leakage into the combustion chamber from around the burner mounting
flange or heat exchanger mounting plate. If flue gas temperatures are too low,
consider increasing the heat input rate or reducing the amount of
supply/return airflow.
11) Cycle the furnace several times to verify the burner lights off and shutsdown
smoothly without excessive noise or smoke production.
Table 1: Oil Burner Application and Specifications for the Crown Furnaces
Furnace Model:
Burner Model: R.W. Beckett, AF R.W. Beckett, NX Carlin Combustion,
EZ-1HP
Riello, 40-F3
Standard Nozzle: Delavan, 0.75 GPH
/ 80 deg. angle /
hollow cone
Delavan, 0.60 GPH
/ 60 deg. angle /
semi solid (W)
Delavan, 0.65 GPH
/ 60 deg. angle /
hollow cone
Delavan, 0.70 GPH
/ 60 deg. angle /
hollow cone
Oil Pump Pressure (PSIG): 130 150 140 150
Burner Head Type: F3 Standard Standard F3
Head / Turbulator Setting: Z = 1.125 in. 3 A = 0.65 2
Air Band Setting: Fully-closed - 0.6 -
Air Shutter / Damper Setting: 5 - Fully-closed 3
Overfire Draft (in. W.G.):
Smoke Spot, Max. (Bacharach Scale):
Carbon Dioxide, CO2, Maximum (%):
Carbon Dioxide, CO2, Minimum (%):
Carbon Monoxide, CO (PPM)
Oil Solenoid Valve Equipped: No Yes No Yes
Prepurge Time (sec):
Postpurge Time (sec):
Ignition Type:
All
# 1
13
12*
0.02
0
None
None
Interrupted
* When operating these furnaces at the lowest input rate (84,000 BTUH), the carbon dioxide (CO
2
)
value may not be able to be adjusted above 12%.
This is normal and does not necessarily indicate
a problem.
Supply/Return Airflow and Air Temperature
The supply/return airflow shall be set to obtain an air temperature rise, across the
furnace, in the range of 70 to 100ºF. Since the flow resistance of each duct system is
slightly different, the airflow (fan speed) may have to be changed in the field to achieve
a satisfactory temperature rise.
23