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Call (800) 217-8437 to talk to an HVAC BALANCE Representative!HVAC BALANCE Frequently Asked Questions (FAQ) - Call (800) 217-8437Example Balance Procedure: Operate all associated fans (supply, return and exhaust) at the appropriate speeds. We test and record motor full load amperage. We test and adjust systems for design CFM recirculated air. The following list are things that should be considered when doing a unit system grille balance: (1) Make sure all branch, zone, and grille dampers are in the open position, (2) Set the total airflow on the Air Handler Unit, (3) Measure all outlets before making any airflow adjustments, (4) Compare your grille readings with your unit traverse to get a duct leakage percentage, (5) Use branch and zone dampers if provided to set flow through all main ducts, and (6) Balance each outlet, and take a final reading. Water Balance Performance Verification involves the following steps: (1) Verify that all control settings have been returned to normal set points, (2) Verify that all discrepancies and punch list items have been corrected, (3) Allow the system to operate automatically for 24 hours, (4) Identify all rooms on temperature test sheets, (5) Note room numbers where all thermostats are located. Record set points of all thermostats, (6) Record temperatures in all rooms. Record outside air temperatures and weather conditions at the beginning and end of temperature tests, and (7) Recheck operation of all HVAC equipment in any room that is not maintaining temperature set point and correct, if necessary. In dual-duct systems, the air handling unit has two coils, a continuously operating cooling coil and a continuously operating heating coil. The cooling coil feeds chilled air into a cold air duct. The heating coil feeds hot air into a hot air duct. The two ducts run in parallel throughout the building. At each space, air is tapped from the two ducts by a terminal unit. The terminal unit has a hot air damper and a cold air damper. When the space thermostat calls for heating, the hot air damper opens. When the thermostat calls for cooling, the cold air damper opens. A Variable Air Volume (VAV) box, is a part of an air conditioning system. It is located inside the duct work. It is designed to control the air flow to a specific area, called a zone. The VAV regulates the volume of the air to the zone by opening or closing the damper, thus controlling the amount of conditioned air directed to the zone. Each zone in a building has a thermostat which controls the VAV, telling it when to open or shut the damper based upon the needs of the zone. An HVAC system provides adequate indoor air quality by: conditioning the air in the occupied space of a building in order to provide for the comfort of its occupants; diluting and removing contaminants from indoor air through ventilation; and providing proper building pressurization. The use of high performance HVAC equipment can result in considerable energy, emissions, and cost savings (10%-40%). Whole building design coupled with an extended comfort zone can produce much greater savings (40%-70%). Extended comfort includes employing concepts such as providing warmer, but drier air using desiccant de-humidification in summer, or cooler air with warmer windows and warmer walls in winter. In addition, high-performance HVAC can provide increased user thermal comfort, and contribute to improved indoor environmental quality (IEQ). Energy-efficient, climate responsive construction requires a whole building perspective that integrates architectural and engineering concerns early in the design process. For example, the evaluation of a building envelope design must consider its effect on cooling loads and day lighting. An energy-efficient building envelope, coupled with a state-of-the-art lighting system and efficient, properly-sized HVAC equipment will cost less to purchase and operate than a building whose systems are selected in isolation from each other. |
