Zone control for HVAC system
US5944098A · kind A · utility
Inventor
Key dates
| Filing date | Jul 17, 1997 |
| Grant date | Aug 31, 1999 |
| Priority date | — |
| Expiry date | Jul 17, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24F11/54
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A control assembly for a HVAC system serving a plurality of zones within a structure, having ducting including a damper situated in an outlet of the ducting leading to each zone, a biasing element biasing the damper in a normally open position, and a motor coupled to each damper for closing each damper. A standard manual or automatic change-over thermostat is situated in each of the zones which includes at least a heating signal output and a cooling signal output. The control assembly formed by a collection of diodes and relays includes a pair of relays having a set of normally open contacts coupled between the damper motors and a source of power, one of the pair of relays having a coil coupled to the heating signal outputs of all of the thermostats and another of the pair of relays having a coil coupled to the cooling signal outputs of all of the thermostats so that, upon initiation of a heating or cooling signal from any of the thermostats, power is applied to the motor coupled to each damper for closing each damper. The control assembly includes individual zone controls each of which are formed by a collection of diodes and relays including a first additional relay which has a s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.