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Furnace Blower Fan Cycles On/Off During the Heating Cycle
LO = 120 F, DIFF = 25 F: when the boiler temperature drops to 110 the burner turns on and the circulator is turned off, just as before. But as the burner re-heats the boiler and the boiler temperature rises back up to 135 F, the burner turns off and the circulator is allowed to turn on. We calculated the 135F as follows: LO setpoint of 120 is
Advantages of an on/off control system: Simple. Least expensive. Disadvantages of an on/off control system: If a large load comes on to the boiler just after the burner has switched off, the amount of steam available is reduced. In the worst cases this may lead to the boiler priming and locking out. Thermal cycling. High/low/off control system
Aquastats: Setting & Wiring Heating System Boiler Aquastat
Burner heats water above the low limit + low diff. "HEATING WTR" Burner (B1) – on Circulator (C1) – off Zone Control (ZC) – off: Step 2: Water is sufficiently heated (Temp. above low limit + low diff.) Burner turns off and zone control is energized. "STANDBY" Burner (B1) – off Circulator (C1) – off Zone Control (ZC) – on: Step 3
May 30, 2017 · This is an area that is located before the burner, where the air and fuel are mixed before they enter the burner. This helps to ensure better combustion, and more efficient heating from the furnace. A furnace burner may be run with gas, oil, or even propane as a fuel source.
Jan 26, 2015 · 1. During the heating time when the furnace is running to reach the temperature ask for, the burners will run for 3.5 to 4 mins.than shut off for 1 min. Then turn on again.it will do this until temp. is meet. The blower will run for another 3 to 4 mins. After furnace shuts off.