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6.When the call for heat is complete, or the unit reaches its setpoint temperature, the gas valve will close, and the fan will continue to run for its 30 second
8.2Resolving Lockouts
There are many causes of lockouts. The four
most common causes are: (1) inadequate gas supply,
(2)poor combustion, (3) ignitor failure (4) combustion
air.
1.Inadequate gas supply: Before proceeding, ensure that the gas supply has not been shutoff or the LP tank (LP boilers) is not empty. Then, restart the boiler and observe the operational cycle. After the
2.Poor Combustion: Poor combustion should be suspected if there is a strong flue gas odor. The odor may result from an improper gas/air ratio
(high or low O2 or CO2). If an improper gas/air ratio is suspected, consult the factory.
3.Ignitor failure: If the boiler goes through a normal start cycle but combustion does not occur, ignitor failure should be suspected. Check the ignitor by unplugging the ignitor plug and measuring the ignitor resistance. It should be
4.Inadequate combustion air: If the boiler goes through a normal ignition cycle, and shuts off after the blower ramps up to full speed, an abnormal restriction in the air intake or exhaust system should be suspected. Check the air filter for buildup of debris and clean filter if necessary. Inspect all exhaust venting and intake venting for blockages. Remove any blockages and inspect and replace any damaged vent sections. If the unit still continues to lockout after igniting, consult the factory.
Once the reason for the lockout has been identified and resolved you can reset the unit by pressing the manual reset button (see Detail A in Figure 30, Control Panel).
8.3 Delayed Ignition - Possible Causes
8.3.1High Lockup Pressure (LP Appliances)
- Occurs on Start-up
High lock up pressure is the most common cause of delayed ignitions on LP fueled appliances. It may result from an improper second stage regulator selection or from a faulty regulator.
Lock up can be detected by measuring the gas supply pressure to the appliance at the inlet pressure port on the gas valve. The gas supply to the appliance must be shut off before making any connections.
To check: use a water manometer or pressure gauge with a scale reading of at least 25 in. W.C. or 15 oz/ in2. (6.2kPa). Attach the manometer to the gas valve inlet pressure port. Turn on the gas supply. The Brute Magnum appliance is designed to operate with supply pressures of
8.3.2Gas Valve Regulation
Gas valve regulation problems can also cause delayed ignitions. If gas valve regulation problems are suspected, consult the factory. Do not attempt field adjustment or repair.
8.3.3Defective Burner - Occurs on Startup
or at Burner Shutdown
A defective burner can cause a delayed ignition. If the gas supply pressure is proper, and the gas valve is functioning properly, the burner should be inspected. There should be no distortion or perforations in the burner. Replace if indicated.
8.4Short Cycling — Boiler
Because the Brute Magnum is a modulating
boiler, and its input will decrease when there is a reduction in heating load, short cycling is greatly reduced. If the heating load drops below the minimum input of the boiler for an extended period, the boiler will have a tendency to short cycle. This can be a symptom of improper control strategy or setpoints, or a load distribution problem. See Section 5.5 regarding controller setup. Contact your Representative to discuss possible remedies.
