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NORA Advanced Efficiency

gether the savings for each individual modification, because some of them affect the same losses. The most economical first cost retrofit is the one that saves the most fuel for the lowest cost. Additional modifications cost more and the added fuel savings often are less. Maximize the Savings In order to be certain customers enjoy the full potential savings from their new high-efficiency equipment, be sure to do the following: • Size the boiler or furnace properly. • Minimize heat loss from other heating system factors. • Use combustion test equip- ment to properly adjust the burner for maximum safety, reliability and efficiency. 28 National Oilheat Research Alliance System Upgrades Replacing the boiler or furnace should be part of a general system upgrade. The following are some of the things that should be included in an upgrade: • Replace the oil lines, especially if they are unprotected lines buried under concrete. Convert from two pipes to one pipe if possible. Follow local codes when replacing oil lines. If they must be under concrete, be sure they are sleeved in protective conduit or are double wall lines built for this purpose. • Replace the flue pipe. Be sure the new pipe is well secured and strapped so it cannot fall down. • Replace any questionable heat distribution parts, like zone valves, expansion tank, and circulator. • Consider bringing in combustion air from outdoors. Check to see where combustion and draft relief air are coming from. A newer home with good air sealing and several exhaust fans may need isolated combustion. • Install a quality oil filter. If there is already a filter, replace the element. • Check the oil tank for water and remove accumulated water. If excessive, find out why. • If the oil tank is accessible, inspect the tank and fuel lines. Are there any provisions for keeping the oil lines outdoors insulated? Is the tank on a stable foundation? Is the outside of the tank rusty? The best time to replace an old tank is before it leaks—when replacing the boiler or furnace. Figure 2


NORA Advanced Efficiency
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