Andrew Kirk Trimble

US Patent:

59186682, Jul 6, 1999

Filed:

Feb 24, 1998

Appl. No.:

9/028494

Inventors:

Andrew M. Trimble - Hydes MD

International Classification:

F25B 2900
G05D 2300

US Classification:

165240

Abstract:

A system (10) for increasing the temperature of air initially delivered by an existing heat pump system (100) is provided which may be easily added to the existing heat pump system. System (10) includes a heat pump comfort controller (12) having a plurality of control signal leads (14, 16, 18 and 20) which are coupled in parallel relationship with a respective plurality of control signal leads (114, 116, 118 and 120) of heat pump system (100) interconnecting the heat pump indoor unit (110) with the heat pump outdoor unit (112). Heat pump comfort controller (12) includes a thermostat (50) for sensing the outdoor ambient air temperature and includes a contact (52) that closes when the outdoor ambient temperature falls below a predetermined value, conducting a control signal from the lead (14) for signaling the energization of supplemental heating units (132) of heat pump system (100). System (10) also includes a duct thermostat (62) which senses the temperature of the main supply air duct (130) of heat pump system (100) for de-energizing the supplemental heating units when the main supply air duct temperature reaches a predetermined value.