longer than 7 minutes or where cold water operation is continuous, provisions must be made to mix higher temperature outlet water with the colder inlet water and thereby raise the inlet temperature to at least 120°F (49°C) within the 7-minute time limit.

Cold Water Starts

Cold water starts, where the inlet water temperature remains below 120°F (49°C) for more than 7 minutes, must have cold water start protection. Known pro- tection methods consist of mixing heated outlet water with the inlet water using a bypass to raise the inlet to 120°F (49°C) or higher. Once the system is heated up and has return water temperatures of 120°F (49°C) or higher, the mixing of outlet water with inlet water is no longer needed and the bypass can be shut off. If the bypass is not shut off as the system heats up, the out- let temperature may continue to climb and trip the high limit, thereby shutting down the heater. Thus an auto- matic valve system, such as a three-way proportional valve or a modulating two-way valve to control the bypass, should be utilized.

and manually adjusted to achieve an inlet temperature of 120°F (49°C) or higher as adjusted at the minimum temperature in this narrow temperature range (i.e. Range 75°F to 85°F – adjust bypass with temperature at 75°F (24°C)) so that when temperature is 85°F (29°C), minimum inlet temperature would be 130°F (54°C). An injector pump arrangement may also be uti- lized to keep the heater loop at or above 120°F (49°C). An injector pump approach has the added value of being able to adjust to changes in the system water coming back to the heater take-off.

*

*Maximum 4 times the pipe diameter or 12”, whichever is less.

Fig. 9: Cold Water Start

Cold Water Run

Cold water run differs from cold water start in that the system water entering the heater remains below 120°F (49°C) continuously. Typically, this is the case in swimming pool heating. If the system water is kept in a narrow temperature range of no more than 10°F (5°C), a permanent manual bypass can be employed

*

*Maximum 4 times the pipe diameter or 12”, whichever is less.

Fig. 10: Cold Water Run

Hydronic Heating

Pump Selection

In order to ensure proper performance of your heater system, you must install a correctly-sized pump. Ray- pak requires designing for a ∆T within the range of 10°F to 40°F (5°C to 20°C). See Table F for accept- able flow rates for each model (∆T is the temperature difference between the inlet and outlet water when the heater is firing at full rate).

Feedwater Regulator

Raypak recommends that a feedwater regulator be in- stalled and set at 12 psi minimum pressure at the highest point of the system. Install a check valve or back flow device upstream of the regulator, with a manual shut-off valve as required by local codes.

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Raypak 5042004 Hydronic Heating, Pump Selection, Feedwater Regulator, Cold Water Starts, Cold Water Run

5042004 specifications

The Raypak 5042004 is a highly efficient pool heater designed for residential and commercial applications, providing warmth and comfort for swimming pools and spas. It is a part of Raypak's extensive lineup of pool heating solutions, known for their reliability and energy efficiency. This model caters to different heating needs while maximizing performance and reducing energy consumption.

One of the standout features of the Raypak 5042004 is its use of advanced heat exchanger technology. Constructed with a durable copper fin design, the heat exchanger enhances thermal conductivity, allowing the unit to heat water quickly and effectively. This ensures a consistently enjoyable swimming experience, even in cooler weather conditions. The heater’s aluminum cabinet is designed to withstand harsh weather and resist corrosion, increasing its longevity and reliability.

In addition to its robust construction, the Raypak 5042004 incorporates a user-friendly digital control system. This control system allows users to set their desired temperature with precision, enabling easy adjustments and enhanced control over the heating process. The digital display provides real-time feedback, giving users insight into the system's operation and current water temperature.

Moreover, this model offers a specialized environmentally friendly option. The Raypak 5042004 is designed to run efficiently on both natural gas and propane, which provides flexibility regarding fuel choice based on availability and personal preference. This versatility is paired with low NOx (nitric oxide) emissions, making it compliant with stringent environmental regulations, making it an eco-friendly choice for consumers.

The ease of installation is another characteristic that sets the Raypak 5042004 apart from its competitors. The unit includes versatile piping options and integrated automation features that facilitate quick and hassle-free installation, ultimately saving time and effort for both professional installers and DIY enthusiasts.

In summary, the Raypak 5042004 is a cutting-edge pool heater that combines high efficiency, robust construction, user-friendly controls, and eco-friendly features. Its advanced heating technologies, durable design, and versatile fuel options make it an excellent choice for anyone looking to enhance their swimming experience year-round while being conscious of energy consumption and environmental impact.