Category: Service Procedures

AIRFLOW MEASUREMENT IN A FAN COIL WITH ELECTRIC HEAT

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AIRFLOW MEASUREMENT IN A FAN COIL WITH ELECTRIC HEAT

Purpose – This procedure describes how to calculate the quantity of airflow in cubic feet per minute (CFM) being delivered by a fan coil containing electric heating elements. Having the correct quantity of airflow is important in order to maintain heating comfort in the conditioned space and for efficient and safe equipment operation. Airflow measurements […]

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COOLING SYSTEM PROPER AIRFLOW RANGE

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COOLING SYSTEM PROPER AIRFLOW RANGE

Purpose — This procedure describes how to determine if airflow across the evaporator in a cooling system is adequate. For proper operation of a cooling system, the blower should be moving from 400 to 450 CFM of air across the evaporator coil for each ton of cooling capacity. For example, on a 2-ton cooling unit, […]

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TEMPERATURE RISE MEASUREMENT IN A FOSSIL-FUEL FURNACE

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TEMPERATURE RISE MEASUREMENT IN A FOSSIL-FUEL FURNACE

Purpose – This procedure describes how to measure the temperature rise in fossil-fuel furnaces. Temperature rise is the difference between the return air temperature entering the furnace, and the supply air temperature leaving the furnace. The amount of temperature rise gives an indication of whether adequate air is flowing across the furnace heat exchangers. However, […]

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