Insulating the supply duct reduces duct loss or gain and prevents condensation. Use 11/2-lb density on ducts that deliver air velocities up to 1500 fpm.…
Category: Air Conditioning
Return-air systems are generally one of two types: the ducted return-air system or the open plenum return-air system (“sandwich space”). See Fig. 15-24. The ducted…
Firestats are furnished as standard equipment. Manual reset types are mounted in the return air and supply air stream. They will shut off the unit…
Photocell detectors detect smoke within the system. They actuate the blower motor controls and other devices to perform the following: 1. Shut off the entire…
Single-rooftop units can be used for both heating and cooling for industrial and commercial installations. Figure 15-22 shows such a unit. It can provide up…
A remote system designed for home or commercial installation can be obtained with a complete package. It has the condensing unit, correct operating refrigerant charge,…
One of the more efficient ways of adding whole-house air conditioning is by adding an evaporator coil in the furnace. The evaporator coil becomes an…
To troubleshoot this type of air-conditioning equipment, a troubleshooting table (Table 15-1) has been provided at the end of this chapter. The general troubleshooting procedures…
A variety of automatic defrosting that can be obtained on some installations using a time clock. The clock shuts the system down at suitable and…
If there is a low-temperature application of the evaporator with dry-coil-type units, then defrosting can be obtained. This is done by providing arrangements for the…