Abstract: A conventional air conditioning system has a heat recovery device installed therein such that the return air from the space is passed through a heat gaining portion thereof, and the resupply air passes through a heat rejection portion thereof. Substantially 100% outside air is passed through the heat rejection portion thereof where it is cooled prior to passing through the evaporator coil and to the space to be cooled. After the return air is passed through the heat gaining portion, it is passed through the condenser coil and then discharged outside. A subcooler is preferably provided downstream of the evaporator coil, and an evaporative cooler is preferably placed upstream of the heat gaining portion of the heat recovery device to provide substantially improved cooling and dehumidification characteristics.

Abstract: In an air conditioning system designed to operate in relatively high humidity conditions, an auxiliary unit, including a complete and independent operating refrigerant circuit, is installed in air flow relationship therewith such that outdoor make-up air is caused to flow first through an auxiliary evaporator coil then through the system evaporator coil, and at least a portion of the return air is passed through an auxiliary condenser coil before being discharged outside. Energy is thereby recovered from the return air, and the make-up air is pre-conditioned to improve the dehumidifying effect of the system.

Abstract: A high latent cooling control assembly for a compression-expansion air conditioning system employs a subcooler coil disposed in the leaving air side of the indoor air evaporator coil. A liquid line branch supplies condensed liquid refrigerant from the condenser to the subcooler coil, and a flow restrictor, which can be a TXV, drops the sub-cooled liquid pressure before the refrigerant reaches the expansion device associated with the evaporator coil. A bypass line connects the condenser to the expansion device, and has a liquid line solenoid valve that is humidistat actuated. When dehumidification is called for, the solenoid is closed and refrigerant flows through the subcooler coil. When the humidistat is satisfied, the solenoid opens and the refrigerant path bypasses the subcooler coil. The high latent subcooler assembly can be field-installed or retrofitted onto an existing air conditioner.

Abstract: Support for the heat exchanger tubes of a gas-fired, year round air conditioning unit are provided by a pair of interlocking, wire frame elements that sandwich the tubes therebetween and are, in turn, securely attached to the frame structure. The two elements are biasingly interlocked in a safety pin fashion, with the combination providing adequate support while, at the same time, offering little resistance to the flow of air over the supported tubes.

Abstract: A heat exchange unit for use in an air conditioning system having an enclosure defining an opening, a heat exchanger within the enclosure and a cover adapted and mounted to the enclosure at the opening, the cover having segments extending between the center portion of the cover and the end surface such that slots are created between adjacent segments. The segments have inclined louver sections such that the air flow through the grille is optimized with the particular fan characteristics. The fan and fan motor may be secured to the center portion of the cover.