# US 2023/0366573 A1 · Fresh air ventilaton control system

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- Number: US 2023/0366573 A1
- Document ID: US20230366573A1
- Status: Published application
- Kind: A1
- Application number: 18/225,507
- Filed: 2023-07-24
- Published: 2023-11-16
- Earliest claimed: 2017-08-28
- Assignees: Field Controls, LLC
- Applicants: Field Controls LLC
- Inventors: Eric A HOKANSON; Timothy K. BEGOSKE; Mark R. LUNDBERG
- Web page: https://patentgrep.com/patent/US20230366573A1

## CPC

- F24F 11/0001: {for ventilation (F24F11/30 takes precedence)}
- F24F 11/52: Indication arrangements, e.g. displays
- F24F 11/61: using timers
- F24F 11/755: for cyclical variation of air flow rate or air velocity
- F24F 2011/0002: {for admittance of outside air}
- F24F 2110/10: Temperature
- F24F 2110/20: Humidity
- F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02)

## Abstract

This disclosure relates to a fresh air ventilation (FAV) controller. The FAV controller may include multiple input devices for setting a target fresh air ventilation flow rate (FAVFR), an operating FAVFR for an air handler, an operating FAVFR of a first ventilation appliance, an operating FAVFR of a second ventilation appliance. The FAV controller further includes electric interfaces adapted to couple to the air handler and a thermostat for controlling the air handler, a sensor for monitoring an operation of the first ventilation appliance, the second ventilation appliance, a thermometer for monitoring temperature of fresh air in a ventilation path to the air handler, and a motorized damper disposed in the fresh air ventilation path. The FAV controller may be configured to monitor operation times of the air handler, the first ventilation appliance, the second ventilation appliance, and the thermometer via the electric interfaces, and to control the air handler and the motorized damper, and/or the second ventilation appliance via the electric interfaces.

## Claims

### Claim 1

A fresh air ventilation control (FAVC) apparatus, comprising:
a first electric interface adapted to couple to a sensor for monitoring an operation of an exhaust appliance;
a second electric interface adapted to couple to an air handler and a thermostat for controlling the air handler;
a third electric interface adapted to couple to a thermometer for monitoring temperature of fresh air in a ventilation path coupled to a return path of the air handler;
a humidity sensor for monitoring relative humidity of a return air of the air handler; and
a system circuitry configured to, based on the temperature of fresh air and the relative humidity of a return air being within threshold ranges, transmit a call to request supplemental fresh air.

### Claim 2 (depends on 1)

The FAVC apparatus of claim 1, wherein:
the system circuitry is configured to transmit the call to request supplemental fresh air when the temperature is in a range between a threshold minimum temperatures and a threshold maximum temperatures.

### Claim 3 (depends on 2)

The FAVC apparatus of claim 2, wherein the threshold minimum temperature is about 17° F.

### Claim 4 (depends on 2)

The FAVC apparatus of claim 2, wherein the threshold maximum temperature is about 100° F.

### Claim 5 (depends on 2)

The FAVC apparatus of claim 2, wherein:
the system circuitry is configured to transmit the call when heating is active and the temperature is above the threshold minimum and below a heating temperature threshold.

### Claim 6 (depends on 5)

The FAVC apparatus of claim 5, wherein:
based on the heating being active and the temperature being above the minimum threshold and below a low ventilation temperature threshold, the system circuitry is configured to reduce an amount of ventilation; and
the low ventilation temperature threshold is below the heating temperature threshold.

### Claim 7 (depends on 6)

The FAVC apparatus of claim 6, wherein the system circuitry is configured to restrict ventilation or terminate ventilation when the relative humidity (a) is above a relative humidity threshold and (b) is not dropping or is rising.

### Claim 8 (depends on 5)

The FAVC apparatus of claim 5, wherein the system circuitry is configured to restrict ventilation or terminate ventilation when the relative humidity (a) is above a relative humidity threshold and (b) is not dropping or is rising.

### Claim 9 (depends on 1)

The FAVC apparatus of claim 1, wherein the system circuitry is configured to transmit the call to request supplemental fresh air when (a) the temperature is in a range between a heating temperature threshold and a threshold maximum temperature and (b) the relative humidity is below a threshold humidity.