Twinning interface control box kit for twinned fan coils in dual heat pump or AC system
AssigneeCarrier Corporation
InventorsRonald G. Butcher, Don A. Schuster
Life of this patent
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Abstract
A control box kit for twinning fan coils in a heat pump or AC installation includes electro-mechanical isolation relays and auxiliary limit switches. Existing fan coil transformers are disconnected to avoid component failure due to high voltage wiring variations. A single transformer is connected to operate both systems. Isolation relays for the reversing valves and supplemental electric heaters in a heat pump system allow both heat pumps to have independent defrost cycles. The accessory transformer and isolation relays are packaged and pre-wired in a control box for easy connection in the field.
Claims26
A control box kit for twinning first and second units of an HVAC system, wherein said first and second units are either first and second air conditioning units or first and second heat pump units, and said system includes first and second fan coils and a thermostat, comprising:
- a control box;
- a single transformer which provides low voltage power to both of said units, said transformer disposed inside said control box;
- and
- connection wires inside said control box pre-wired for a preselected twinned-unit operating configuration such that an installer makes all field connections for said preselected twinned-unit operating configuration between said thermostat, said first and second fan coils, and said first and second units to said connection wires.
Dependencies are inferred from the claim text.