In addition to monitoring and displaying boiler status, the CPW board controls the timing of various operating functions including: boiler pump turn-off delay, blower fan pre-purge, and blower fan post-purge. The location of each user- adjustable timing is shown in Figure L-1.

Figure L-1

CPW Board

•Pump Turn-off Delay

The CPW board has a built-in pump driver with pump turn-off delay, which allows the operator to set how long the pump will run after the boiler shuts off. The delay is factory-set for 7 minutes but can be field-adjusted from 3 minutes to 10 minutes. The pump relay can directly power a pump of up to 12.0 amps draw or 1.0 Hp capacity. Pumps with larger amp draws should be energized through a pump contactor that is controlled by the CPW board.

By properly setting the pump turn-off delay, the boiler pump will continue running for a limited period of time in order to extract any residual heat from the combustion chamber. The pump will then shut off to conserve energy until the next call for heat. The pump-off time delay should be set to the minimum time required to extract all residual heat from the heat exchanger. If temperature as monitored at the boiler outlet increases more than 5°F after the pump turns off following a firing cycle, the pump-off time delay should be extended by thirty seconds. Increase or decrease time delay as appropriate until outlet temperature does not spike more than 5°F after pump shut-off following a prolonged firing cycle (> 5min.)

CAUTION:

The boiler requires forced water circulation when the burner is operating and the pump must be interlocked with the boiler. See Section D for minimum water maximum flow rates and pump selection.

NOTICE:

Pump will come on when power is first applied to the boiler.

•Blower Fan Pre-purge

The CPW board has a built-in pre-purge delay which operates the blower fan for a user-adjustable time period prior to pilot trial for ignition. The pre-purge period ensures that the combustion chamber is clear of all excess combustible gases prior to commencing the pilot ignition cycle. The pre-purge delay is factory set for 45 seconds and it can be adjusted in the field from 45 seconds to 120 seconds. To optimize boiler response time on call-for-heat, set the pre-purge delay to the minimum allowed by local, state or national code.

•Blower Fan Post-purge

The CPW board has a built-in post-purge delay to exhaust residual combustion products after the main gas valve closes. The post-purge timing is factory set at 3 minutes and is not field-adjustable .

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Raypak 500, 750, 1000 installation instructions Figure L-1 CPW Board Pump Turn-off Delay
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1000, 750, 500 specifications

Raypak is a renowned name in the heating industry, particularly known for its high-quality pool and spa heaters. Among their extensive product line, the Raypak 850, 500, 300, 400, and 700 models stand out for their reliability, efficiency, and cutting-edge technologies. Each model is designed to cater to different needs and applications while maintaining Raypak’s commitment to performance.

The Raypak 850 is designed for larger commercial pools or residential setups requiring high output. With a powerful heat exchanger made from copper and bronze, it ensures superior heat transfer and longevity. Its digital control system provides precise temperature regulation, enhancing user experience. Moreover, it features a durable construction with weather-resistant materials, ensuring lasting performance in various environments.

The Raypak 500 model offers a balance between efficiency and compactness. It features eco-friendly technology that reduces energy consumption without sacrificing performance. The integrated thermostat allows users to maintain consistent water temperatures, making it ideal for residential pools. This model is well-regarded for its user-friendly digital display, simplifying operation and monitoring.

For those needing a more moderate capacity, the Raypak 300 is an efficient choice. It combines robust engineering with an easy-to-use interface. Its advanced ignition system improves reliability while minimizing energy waste. The Raypak 300’s compact design allows for easy installation in various spaces, making it an excellent option for smaller pools.

The Raypak 400 heats water quickly and efficiently, making it suitable for both residential pools and spas. It features a high-capacity heating system that ensures optimal performance. With a clear LED display, users can easily monitor their settings, while the integrated diagnostics provide real-time feedback for maintenance and troubleshooting.

Lastly, the Raypak 700 model is known for its versatility and robust performance. It is equipped with advanced safety features, including a high limit switch and water flow detection mechanism, to ensure safe operation. The model's energy-efficient design enhances its eco-friendliness, making it a popular choice among environmentally conscious users.

Collectively, these Raypak models exemplify superior engineering, performance, and user-friendliness. Their innovative features ensure that they meet the varied demands of pool owners while providing reliable heating solutions for leisure and relaxation. Whether for commercial or residential use, the Raypak 850, 500, 300, 400, and 700 offer unmatched quality and efficiency.
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