AquaStar 38B NG, 38B LP HOT Water Temperature Fluctuates, Unbalanced pressure in waterlines

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heaters, the burners of a tankless water heater must be very powerful to heat water instantaneously since they do this only at the time hot water is actually being used. It is therefore imperative that the gas pressure requirement be met exactly. Insufficient gas pressure will directly affect the water temperature at the time of usage. See pages 2 and 13 respectively for correct gas pressure settings and where gas pressures are taken.

4.Btu input is too low due to insufficient gas supply Make sure your main gas line is fully opened. If using LP gas, be sure that the size of the propane tank is adequate to supply the required gas pressure.

5.Cold water is mixing with the hot water between the AquaStar and the outlet

Compare water temperature at outlet of the AquaStar (hold the AquaStar’s outlet pipe with your hand) and at the tap. If these two are very different, check for mixing valve or plumbing crossover (see “MAIN BURNERS WILL NOT IGNITE...” paragraph #6). Where automatic “anti-scald” valves are required by code, lower the temperature setting on the AquaStar as much as possible and balance the pressure between cold and hot water after the AquaStar.

6.Parts in water flow valve are corroded so that the gas passage is not fully opening.

Contact your service person or Controlled Energy.

HOT WATER TEMPERATURE FLUCTUATES

1. Unbalanced pressure in waterlines

The added restriction caused by the Aquastar in the hot water system can result in uneven pressures between the cold and the hot. In such cases when mixing cold water at the tap, the lower hot water pressure may be overpowered by a much higher cold water pressure, which may cause the Aquastar burners to shut down. Make sure faucet aerators or shower heads are free of minerals. Do not add any flow restrictor to the shower head.

2.Cold water is mixing with the hot water between the AquaStar and the outlet

See #6 under “Burners do Not Ignite When Hot Water Turned On”.

3.Inlet water pressure is erratic due to inadequate supply water pressure or saturated pressure tank on well system

Check the inlet water pressure. On a private well, raise minimum pressure setting to 30 psi. Confirm that the pressure tank is not water logged.

4. Insufficient gas pressure

Check gas pressure requirements (page 2) and consult gas service person.

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Contents For Your Safety Table of ContentsWhat to do if YOU Smell GAS Features AquaStar 38B LP and 38B NG SpecificationsUnpacking the Aquastar Heater Open loop potable water and combination space heating system Proper Location for Installing Your Heater General Rules to Follow For Safe OperationCombustion AIR Requirement Could FreezeMounting Installation ClearancesVenting Maximum Inlet GAS Flow Pressure Setting Water ConnectionsAltitude Natural Gas Liquid Propane Above 4.500 ft consult your local gas supplierFor Your Safety Read Before Lighting the Pilot Operating InstructionsSetting the Water Temperature Lighting InstructionsTo Turn OFF GAS to Appliance Maintenance and Service Characteristic Pilot FlameTrouble Shooting Pilot Lights but Flame Goes OUT When Button is ReleasedBurners do not Ignite When HOT Water is Turned on Water is TOO HOTWater is not HOT Enough HOT Water Temperature Fluctuates Unbalanced pressure in waterlinesInsufficient gas pressure Diagram of AquaStar 38 B Interior Components Diagram and Parts List Interior Components Diagram Parts List 38B LPGInstallation Checklist Controlled Energy Corp

38B LP, 38B NG specifications

The AquaStar 38B LP and AquaStar 38B NG are cutting-edge water heating solutions designed for efficiency and performance, ideal for both residential and commercial applications. These models boast a sleek, compact design, making them suitable for installation in tight spaces while still delivering robust heating capabilities.

One of the key features of the AquaStar 38B LP and 38B NG is their advanced energy efficiency. With an impressive Energy Factor (EF) rating, these units utilize state-of-the-art heat exchange technology to maximize heat transfer and minimize energy consumption. This translates to reduced utility bills and a smaller carbon footprint, making them eco-friendly options in today’s sustainability-focused market.

The AquaStar models are available in two fuel types: LP (liquefied propane) and NG (natural gas). This dual-fuel flexibility allows users to select the ideal option based on availability and cost, ensuring optimal performance tailored to individual needs. The integration of high-quality burners further enhances the efficiency and reliability of these systems, ensuring quick recovery times and consistent hot water availability.

One notable characteristic of the AquaStar 38B units is their ability to provide continuous hot water. This makes them an excellent choice for households with high demand or commercial establishments like restaurants and hotels, where hot water is required throughout the day.

Moreover, the AquaStar 38B models are equipped with innovative safety features to enhance user protection. The built-in temperature control mechanism allows users to set their preferred water temperature, while also incorporating anti-scald technology to prevent overheating.

In terms of maintenance, the AquaStar 38B units stand out with their user-friendly design. Routine maintenance is straightforward, and the models feature easily accessible components for servicing, which contributes to their longevity and reliability.

In conclusion, the AquaStar 38B LP and 38B NG represent a fusion of efficiency, safety, and advanced technology. With their energy-saving capabilities, versatile fuel options, and robust design, these water heaters are a worthwhile investment for anyone seeking reliable and efficient hot water solutions.
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