Lifebreath 60VENTAC Design vs. Field Conditions, Water System Pressures, Head Pressure, Flow Rate

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With an Integrated Combo System, the hot water temperature is approx. 130˚F (54˚C) which is 60˚F (15.5˚C) above the return air temperature. These units typically have a temperature rise of 35˚F (2˚C) to 40˚F (4˚C) and therefore would deliver air at the diffuser at approximately 105˚F (40.5˚C) to 110˚F (43˚C).

Design vs. Field Conditions

The factors discussed above become very important to consumer comfort. Even small differences between design parameters and actual field conditions can impact greatly on output capacity. Therefore, it is important to do a thorough and complete commissioning of the integrated combo system to ensure the design parameters are met.

Water System Pressures

Within the water system of an Integrated Combo system, there are three terms that the designer/installer must understand. These are head pressure, water flow rate, and pressure drop.

Head Pressure

Head pressure is the pressure created by the circulation pump to push water through the piping system. It is this pressure which is used to overcome the resistance to water flow (friction) caused by the water pipe and fittings. It is similar in concept to the external static pressure in an air duct system. Head pressure is measured in feet or water (millimeters of water).

Note: Although the water in the combo system is pressurized by the domestic water system the pump is required to create water flow in the heating loop. The domestic water system applies the same pressure to the supply and return sides of heating loop.

Note: The vertical height of the heating loop does not impact on the head pressure as the pressure required to push the water up the vertical height is offset by the weight of the water in the vertical drop on the other side of the heating loop.

Flow Rate

Flow rate is the amount of water flowing in the system. It is directly related to the head pressure and the resistance to flow. Flow rate is measured in gallons per minute (liters per minute).

Pressure Drop (PD)

Pressure drop (PD) is the reduction in total pressure caused by components added to a piping system such as coils, valves, and fittings. The measurement of pressure drop is the difference in pressure on the inlet side of the component and the outlet side. Pressure drop is measured in feet of water (millimeters of water).

When connecting the water lines for heating loop (air handler) to the domestic water system, the pipes should be connected with a “tee” to the side of a vertical domestic water pipe or the bottom of a horizontal domestic water pipe. This is to help prevent air from entering the heating loop. The connections should be as near as practical to the water heater.

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Contents OPERATION, Sizing and Installation Manual Table of Contents Introduction Description and Purpose Closed/Open Combo System Combo System Basic PrinciplesWater Piping Call for Space Heating Only OperationCall for Domestic Hot Water and Space Heating Operation Air SystemManual Valves Check Valves Shut Off ValvesDrain Valve Throttling ValveOff Season Circulation Controls Expansion TanksCold Anti-Scald ValveRoom Thermostat Air Handler Return Air TemperatureAir Handler Temperature Rise Water Heater ThermostatFlow Rate Design vs. Field ConditionsWater System Pressures Head PressureFilters Case Dimensions & ClearancesWarranty Model 40DHW Up Flow60DHW Model 60DHW Up Flow40DHWDF Model 40DHWDF Down Flow60DHWDF Model 60DHWDF Down Flow40DHWH Model 40DHWH Horizontal60DHWH Model 60DHWH Horizontal4TONDHW High CFM Lower Btuh Output40VENTAC Model 40VENTACCore Filters Case 60VENTAC Model 60VENTAC4TONVENTAC Model 4TONVENTACOption 1 Ventilation Ports Off Left Side Locating The UnitDuct Connections Ducting Option 2 Ventilation Ports Off Right SideHorizontal Version Locating Weatherhood Locating Intake WeatherhoodLocating the Exhaust Weatherhoods Outside Ducting the WeatherhoodsPrior to balancing, ensure that Balancing ProcedurePitot Tube Air Flow Balancing Balancing Collar Instructions Placement of the Pitot TubePitot Tube and Gauge Piping HRV Drain Line DiagramDrain Line Water Heater PlumbingElectrical Clean Air Furnace Wiring DiagramOptional Dehumidistat Following conditions must be met prior to start-up Start-Up ProcedureVentilation Optional Circulation Timer ModelsOperation Heating/CoolingHRV core freezes up TroubleshootingLack of heat Pump is noisyHumidity levels are too low During cooling cycle, hot water circulates through the coilWater sits in drain pipes Condensation/ice forming inside ventilation ductsSystem Commissioning Water Pump Performance SpecificationsWorksheet for Integrated Combo System Design Part a Design Load Specifications Method a domestic hot water usage for C.1 Part D Proving Required Water Flow Commissioning of Integrated Combo System HRV Balancing McCormick Blvd. London, Ontario N5W 4C8

40DHWDF(T), 4TONVENTAC, 60VENTAC, 40VENTAC, 60DHWH(T) specifications

Lifebreath is a leading manufacturer specializing in indoor air quality solutions, with their series of heat recovery ventilators tailored for both residential and commercial applications. Among their advanced systems, the Lifebreath 60DHW(T), 60DHWDF(T), 4TONVENTAC, 40DHW(T), and 40DHWDF(T) provide exceptional ventilation performance alongside energy efficiency.

The Lifebreath 60DHW(T) and 60DHWDF(T) models are designed for larger spaces, featuring an impressive air flow rate of 60 CFM, making them ideal for homes and businesses that require a robust ventilation solution. These units incorporate a state-of-the-art heat exchange core, allowing for the transfer of heat from outgoing stale air to incoming fresh air, thereby minimizing energy loss.

The significant advantage of Lifebreath's 60DHW series lies in its dual-fan operation, which delivers balanced air flow while maintaining a comfortable indoor climate. Both models are equipped with advanced filtration systems, providing effective capture of airborne pollutants and allergens, promoting optimal air quality.

Moving to the Lifebreath 4TONVENTAC, this unit offers a unique combination of ventilation and cooling functionalities, making it suitable for environments with varying weather conditions. With a 4-ton capacity, it is perfect for larger commercial establishments. The 4TONVENTAC employs innovative technology for efficient energy use, incorporating variable speed drives to adapt to changing ventilation demands, ensuring maximum energy conservation and performance.

The Lifebreath 40DHW(T) and 40DHWDF(T) are perfect for smaller residential applications. With an airflow capacity of 40 CFM, these units maintain comfort without over-ventilating. Similar to the 60DHW models, they feature the same exceptional heat exchange technology to promote energy savings. The 40DHW series also includes user-friendly controls and monitoring features, enabling homeowners to adjust settings for optimal performance based on their specific needs.

A common characteristic across all these models is Lifebreath’s commitment to durability and reliability. Made from high-quality materials, they are built to withstand varying environmental conditions while providing long-lasting service. With easy installation and low maintenance requirements, these heat recovery ventilators prove to be a smart investment for users looking to improve their indoor air quality while reducing energy costs.
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