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35 8 31 2 55 8 51 2 75 8 71 2 23 4 213 16 35 8 31 2 35 8 31 2 35 8 31 2

Forced-air furnaces are reliable workhorses that need to have their filters cleaned or changed at least once per month when in use

or like the following:

Otherwise, a dirty, clogged filter can reduce the efficiency of heat output by as much as 70 percent and will cause the entire heating unit to overexert itself trying to reach a 68-degree thermostat setting when outside temperatures plummet below freezing The air that passes through the filter is cool air drawn from the inside of the house After being filtered clean, it gets warmed by the fuel burner flame, then blown back into the house through ducts and registers Naturally, if you live in a dusty environment or own a long-haired pet, you ll have to clean or replace air filters more frequently than if you lived in a cleaner area and didn t own a pet Most furnaces now are direct drive If your furnace is belt driven, check the condition of the belt (adjust/replace if needed) A qualified serviceperson should inspect the furnace yearly Some of the blower motor and fan assemblies have permanently lubricated bearings, while other bearings should be oiled before each heating season begins and periodically throughout the fall and winter months

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In both cases, the window is separated into four equal horizontal frames You can use both the cols and rows attributes in a single frameset to combine a horizontal and vertical layout The structure of a mixed layout can become tricky, but always remember you begin at the top and move from left to right, top to bottom, creating a grid of frames Here s an example with four frames, created from two rows and two columns:

<frameset rows="*,*" cols="*,*"> <frame src="blankhtml" /> <frame src="blankhtml" /> <frame src="blankhtml" /> <frame src="blankhtml" /> </frameset>

If your furnace has a humidifier, it should be checked annually Change the water panel; make sure the unit is receiving water through its system and discharging excess water out the drain line

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When you mix columns and rows in a frameset, you are limited to the same number of columns as rows If you want to have a different number of columns than rows in your layout, you must nest frameset tags, as discussed later in this chapter, in the section titled Nest Framesets

Boilers are expensive and somewhat temperamental heating units, especially if their operating conditions are allowed to vary from those suggested by the manufacturer Read the instructions and maintenance literature carefully and have boilers inspected by a professional before each heating season, then do it by yourself at least once per month during the rest of the cold months while the boiler is in use There should be a low-water emergency cutoff that will prevent the boiler from operating in case not enough water gets into the boiler for it to run safely The low-water cutoff should have water drained through it to expel any rust or corrosion that might settle there and plug the line (follow the manufacturers instructions) If pockets of air form in the pipes, radiators, and baseboards of hot water systems, they must be bled or released so the hot water can freely circulate

Figure 10-1

Although electric heating systems have traditionally been some of the most expensive to operate because of the cost of heating electricity when compared to the cost of heating with natural gas or oil, they re practically maintenance-free About all that s needed is to periodically vacuum dust and dirt from the heater and heating coils Solar and other alternative heating sources should be inspected and maintained as recommended by the manufacturers With all equipment, be aware of where emergency shutoff valves and switches are, and how to restart a system if needed Ask the serviceperson what maintenance you should be doing between service calls, and how you can confirm that everything is working safely and efficiently

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