PILOT TURN DOWN TEST FOR RAYPAK HI DELTA BOILERS

The Hi Delta boilers, depending on their size, have from two to five burner sections. Each burner section is supplied gas by dual gas valves incorporated in single valve body. A maximum of three burner sections may be controlled by a single hot surface ignition system. The middle of the three burner sections is lighted directly with a hot surface ignition system. The burner section that is ignited directly by the hot surface ignition system serves as a supervised pilot to light the burner sections on either side of it. The burner sections on either side of the supervised section (pilot) are electrically interlocked with the supervised ignition system so as to not be energized unless flame is proven on the center section which is acting as a pilot to light the right and left hand sections.

The pilot turn down test is conducted as follows:

1)Turn off manual valves on non-supervised burner sections.

2)Turn on electrical power and adjust thermostat to call for heat.

3)Wait for completion of ignition sequence to light burner section being utilized as a pilot for those turned off in (1) above.

4)Gradually reduce manifold pressure (flame) on supervised burner section by closing manual gas valve. Watch for shut down due to loss of supervised flame signal as pressure is being reduced. Flame signal should be lost before manifold pressure goes below 2 inches water column.

LEAK TEST PROCEDURE: DUAL-SEAT GAS VALVES

Proper leak testing requires three pressure test points in the gas train.

Test point A is upstream of the automatic gas valve. On the first automatic valve, this is a bleedle valve. On the other valves, this is a plugged port. The bleedle valve on the first valve may be used for all the other valves as well.

Test point B is a bleedle valve located between the two automatic gas valve seats.

Test point C is located downstream of both automatic gas valve seats and upstream of the manual valve. On the manual valve, this is a bleedle valve. Identical readings will be found at the plugged port labeled as Alternate C”.

Refer to attached diagrams. Numbers on the diagram refer to the steps below:

These tests are to be conducted with the electrical power to the boiler turned off.

1)Manually close the downstream leak test valve.

2)Open test point A and connect a manometer to it. Verify that there is gas pressure and that it is within the proper range (note: must not exceed 14 inches water column).

3)Open test point B and connect a rubber tube to it. Connect the other end of the tube to a manometer and look for a build u of pressure. Increasing pressure indicates a leaking gas valve.

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Raypak 302-902 manual Pilot Turn Down Test for Raypak HI Delta Boilers, Leak Test Procedure DUAL-SEAT GAS Valves
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302-902 specifications

The Raypak 302-902 is a highly efficient, reliable, and versatile heating solution commonly used in residential and commercial pool heating applications. Known for its exceptional performance and advanced technology, the Raypak 302-902 has become a favored choice among pool owners looking to extend their swimming season and enhance comfort.

One of the main features of the Raypak 302-902 is its robust construction. Built with a copper heat exchanger, it is designed to withstand the rigors of continuous use while offering superior heat transfer capabilities. The heat exchanger is also designed for easy maintenance, enabling pool owners to keep their systems running efficiently for years.

The Raypak 302-902 employs advanced digital controls, which provide precise temperature regulation. This modern control system allows users to set their desired water temperature with accuracy and maintain it consistently, ensuring a pleasant swimming experience. Additionally, these digital controls feature self-diagnostic capabilities, alerting users to potential issues, which aids in quick troubleshooting and maintenance.

In terms of energy efficiency, the Raypak 302-902 stands out with its ability to harness energy effectively, leading to significant savings in operational costs. It is equipped with an efficient gas burner, which optimizes fuel consumption while delivering rapid heating performance. This efficiency is complemented by its ability to operate with natural gas or propane, making it adaptable to various setups and preferences.

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In conclusion, the Raypak 302-902 offers an array of features, technologies, and characteristics that make it a top contender in the pool heating market. With its durable construction, advanced digital controls, energy efficiency, and environmentally friendly operation, it remains a reliable choice for those seeking comfort and convenience in their swimming experience. Whether for a backyard oasis or a commercial facility, the Raypak 302-902 delivers consistent performance and accessibility.
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