Lifebreath AH60DHW, AH40DHW Call for Space Heating Only Operation, Air System, Water Piping

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Call for Space Heating Only Operation

When the thermostat calls for heat, the circulation pump is activated and hot water is drawn from the top of the water heater through the air handler, and then returned to the water heater. There should be at least a 20˚F (11˚C) temperature drop between the hot water supplied to the air handler and the returning water temperature. If the temperature drop is less then 20˚F (11˚C) two things may happen:

1.Mixing of warm return water with the hot water within the water heater (no tank stratification), which will result in a lower hot water supply temperature.

2.A water heater thermostat temperature differential (between on and off) is approximately 18˚F (10˚C). Therefore, if the return water is not cool enough, it may not activate the water heater thermostat, which causes the burner to operate. All of the water in the water heater will be cooled before the burner begins to operate. This may cause large swings in the delivered hot water temperature, causing poor space heating performance, fluctuating domestic water temperatures and effectively reducing the supply of domestic hot water.

Call for Domestic Hot Water and Space Heating Operation

When both return water from the space heating loop and new cold water (replacing domestic water being used) enters the water heater, the mixed entering water is cool enough to activate the thermostat quickly. In this situation, the water heater must be capable of satisfying the combined need for hot water (domestic hot water and space heating) at the same time.

Air System

A circulation fan draws cool house air at approx. 70˚F (21˚C) from the return ductwork, forces it through the water coil where it is heated, and then distributes it to the various rooms of the house through the supply ductwork.

Water Piping

The Piping and fittings used to connect the water heater and air handler must be sized to handle the volume of hot water required by the air handler within the pressure limitations of the circulation pump. All piping, fittings solders, and fluxes must be acceptable for use with domestic hot water.

Note: Chemicals (such as boiler system additives) cannot be added to the system because water passing through the heating loop re-enters the domestic water systems.

Circulation Pump

The circulation pump is factory installed within the air handler. The water flow rate will vary depending on the pumps performance and the head pressure (resistance) of the complete heating loop system.

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Contents OPERATION, Sizing and Installation Manual Table of Contents Introduction Description and Purpose Important NoteCombo System Basic Principles Closed/Open Combo SystemAir System Call for Space Heating Only OperationCall for Domestic Hot Water and Space Heating Operation Water PipingManual Valves Throttling Valve Shut Off ValvesDrain Valve Check ValvesWater Expansion TanksCold Anti-Scald ValveWater Heater Thermostat Air Handler Return Air TemperatureAir Handler Temperature Rise Room ThermostatHead Pressure Design vs. Field ConditionsWater System Pressures Flow RateWarranty SpecificationsDimensions & Clearances Model AH40DHWModel AH60DHW AH60DHWModel AH40BHW AH40BHWModel AH60BHW AH60BHWModel AH80BHW AH80BHWDuct Connections InstallationLocating The Unit DuctingPlumbing Water HeaterAir Handler Wiring Diagram ElectricalOptional Dehumidistat OutsideStart-Up Procedure Following conditions must be met prior to start-upHeating/Cooling Optional Circulation Timer ModelsOperation Continuous Low Speed Hook UpTroubleshooting Lack of heatPump is noisy Water Pump Performance Specifications System CommissioningPage Page Page Page Page Page

AH60BHW, AH80BHW, AH40BHW, AH40DHW, AH60DHW specifications

Lifebreath is a recognized leader in energy recovery ventilation systems, and its line of products, including the AH60BHW, AH40BHW, AH40DHW, and AH80BHW models, reflects the company's commitment to delivering high-quality indoor air solutions. These models provide an innovative approach to enhancing indoor air quality while ensuring energy efficiency.

The Lifebreath AH60BHW model is designed to meet the demands of larger spaces, offering a remarkable airflow capacity. This system incorporates advanced energy recovery technology, enabling it to efficiently transfer heat and moisture between incoming and outgoing air streams. As a result, it maintains comfortable indoor conditions regardless of the external climate, ensuring optimal performance year-round.

For medium-sized areas, the AH40BHW and AH40DHW models are excellent choices. Both systems feature similar designs with slight variations in their configurations. The AH40BHW operates using hot water, making it particularly effective in radiant heating applications. In contrast, the AH40DHW relies on direct water heating, providing reliable and consistent heat distribution. These models also boast high-efficiency filtration systems that capture airborne pollutants, contributing to healthier indoor environments.

The Lifebreath AH80BHW is tailored for extensive applications, delivering superior ventilation and energy management. It utilizes a robust heat recovery core that maximizes energy savings and ensures minimal heat loss during the exchange process. Additionally, the AH80BHW's compact design makes it versatile for various installation scenarios, whether in residential settings or commercial spaces.

All models are equipped with user-friendly controls that allow easy adjustments of airflow settings to suit specific requirements. Furthermore, the addition of advanced monitoring technology ensures that users can track system performance and energy usage, optimizing efficiency. With quiet operation characteristics, these systems enhance comfort without disruptive noise.

Overall, Lifebreath's AH series ventilation systems represent a combination of cutting-edge technology and practical design. Their focus on energy recovery, high filtration efficiency, and user-friendly operation makes them an ideal choice for anyone seeking better air quality and comfort in their indoor spaces. Whether for residential or commercial needs, Lifebreath provides reliable solutions that prioritize both health and efficiency.
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