Controller for two-stage heat source, usable with single and two stage thermostats
US6230979A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 20, 2000 |
| Grant date | May 15, 2001 |
| Priority date | — |
| Expiry date | Jan 20, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23N2237/10
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A controller for a two-stage heat source that can be used with a single stage or a two stage thermostat. The controller includes a second stage delay timer that initiates second stage heating when the timer is decremented to zero. The timer is reset when there is no longer a call for first stage heat, when there is a call for second stage heat, or if there is no call for second stage heat and the controller determines that it is connected to a two-stage thermostat. The controller can include an indicator such as a contact bar and jumper or a switch for indicating the type of thermostat connected to the controller. Alternatively, the controller can be programmed to "learn" whether it is attached to a single stage or two-stage thermostat, assuming that it is connected to a single stage thermostat, unless and until a call for second stage heating is received.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.