Calibration apparatus for air flow controllers
First Claim
1. Apparatus for calibrating a pneumatically controlled HVAC system of ducts, wherein a pneumatic controller having multiple air fittings receives air through a first said fitting from a source of high pressure air and separately receives a first pneumatic signal through a second said fitting from a thermostat and a second pneumatic signal through a third said fitting reflecting the rate of air flow in a duct in said system to generate a third pneumatic signal operable through a fourth said fitting to actuate a damper positioner for a damper in said duct, which comprises in combination:
- separate first and second air pressure regulators adapted to receive air from said source of high pressure air;
said first regulator connectable to said second fitting to supply a simulated said first pneumatic signal to said controller in place of said first pneumatic signal from said thermostat;
said second regulator connectable to said third fitting to supply a simulated said second pneumatic signal to said controller in place of said second pneumatic signal; and
a first pressure sensor adapted to indicate the magnitude of said third pneumatic signal generated by said controller in response to said simulated first and second pneumatic signals.
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Abstract
The present invention calibrates air flow controllers by simulating pneumatic signals present in typical heating, ventilating and cooling systems. The controllers receive pneumatic status signals and in response, operate dampers in the air ducts. Each controller must be set to move the damper among positions for air flow rates between calibrated minimum and maximum air flow positions in the duct. The apparatus connects through air piping to the controller to be calibrated. A variable regulator adjusts a supply of constant pressure air to simulate the pneumatic signal from a thermostat while a second variable regulator simulates the differential pressure signal. Gauges register the simulated signals. A third gauge registers the damper control signal generated by the controller. To calibrate a controller, the thermostat and differential air pressure signals are communicated to the controller. The controller dial is then adjusted to provide a pneumatic signal which operates the damper.
45 Citations
16 Claims
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1. Apparatus for calibrating a pneumatically controlled HVAC system of ducts, wherein a pneumatic controller having multiple air fittings receives air through a first said fitting from a source of high pressure air and separately receives a first pneumatic signal through a second said fitting from a thermostat and a second pneumatic signal through a third said fitting reflecting the rate of air flow in a duct in said system to generate a third pneumatic signal operable through a fourth said fitting to actuate a damper positioner for a damper in said duct, which comprises in combination:
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separate first and second air pressure regulators adapted to receive air from said source of high pressure air; said first regulator connectable to said second fitting to supply a simulated said first pneumatic signal to said controller in place of said first pneumatic signal from said thermostat; said second regulator connectable to said third fitting to supply a simulated said second pneumatic signal to said controller in place of said second pneumatic signal; and a first pressure sensor adapted to indicate the magnitude of said third pneumatic signal generated by said controller in response to said simulated first and second pneumatic signals. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Apparatus for calibrating a pneumatically controlled HVAC system of ducts, thermostats and dampers comprising:
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a first input fitting attachable to a first source of air; a first output fitting; a first air pressure regulator interconnecting said first air input fitting and said first output fitting arranged and of a character to deliver air at a regulated pressure to said first output fitting; a second output fitting; a second air pressure regulator interconnecting said first air input fitting and said second output fitting arranged and of a character to deliver air at a regulated pressure to said second output fitting; a second input fitting attachable to a second source of air; and a first pressure sensor adapted and of a character to indicate the pressure at said second input fitting. - View Dependent Claims (8, 9, 10)
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11. Apparatus for calibrating a pneumatic air control device in a pneumatically controlled HVAC system of ducts, fans, thermostats, and dampers, comprising:
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a first pneumatic input signal fitting adapted to receive a constant pressure pneumatic input signal; a first variable regulator in communication with said first pneumatic input signal fitting for generating a first pneumatic output signal; a first gauge to register said first pneumatic output signal; a second variable regulator in communication with said first pneumatic input signal fitting for generating a second pneumatic output signal; a second gauge to register said second pneumatic output signal; a second pneumatic input signal fitting adapted to receive a second pneumatic input signal generated by said control device in response to said first and second output signals; and a third gauge in communication with said second input signal fitting to register said second input signal. - View Dependent Claims (12, 13, 14)
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15. A method of calibrating a pneumatically controlled HVAC system of ducts, thermostats and dampers, wherein a pneumatic controller which is operable in response to a first pneumatic signal from a thermostat in the system and to a second pneumatic signal from an air flow rate sensor in one of said ducts to transmit air from a source of relatively high pressure air to a damper actuator for a damper in said system, which comprises:
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transmitting air at a first predetermined pressure from said air source to said controller in place of said first pneumatic signal; transmitting air at a second preselected pressure from said air source to said controller in place of said second pneumatic signal; and detecting the pressure of air to be transmitted from said controller to said damper actuator in response to said first and second preselected signals. - View Dependent Claims (16)
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Specification