Mechanical ventilation differs from natural ventilation mainly in that the air circulation is performed by mechanical means (such as fans or blowers). In natural ventilation,…
Table 3-1 is a guide to the amount of air required for efficient ventilation. This information should be used in connection with the ventilatorcapacity tables…
Several factors must be taken into consideration in selecting the proper ventilator for any specific problem: ? Mean temperature difference ? Stack height (chimney effect)…
The two natural forces available for moving air through and out of buildings are wind forces and temperature difference between the inside and the outside.…
Air leakage caused by cold air outside and warm air inside takes place when the building contains cracks or openings at different levels. This results…
Ventilation is produced by two basic methods: natural and mechanical. Natural ventilation is obtained by open windows, vents, or drafts, whereas mechanical ventilation is produced…
Troubleshooting procedures for the Lennox Pulse furnaces are shown in Fig. 2-20. Figure 2-21 shows the circuitry for the G-14Q series of furnaces. Note the…
The process of pulse combustion begins as gas and air are introduced into the sealed combustion chamber with the spark plug igniter. Spark from the…
On a demand for heat, the room thermostat initiates the purge blower operation for a prepurge cycle of 34 s, followed by energizing of the…
The furnace is equipped with a standard-type redundant gas valve in series with a gas expansion tank, gas intake flapper valve, and air intake flapper…