Safety Inspection

1.Check all thermostats and high limit settings.

2.During the following safety checks leave manome- ters hooked up, check and record.

3.If other gas-fired appliances in the room are on the same gas main, check all pressures on the Hi Delta with all other equipment running.

4.Check thermostats for ON-OFF operation.

5.Check high limits for ON-OFF operation.

6.While in operation, check flow switch operation.

7.Check the low gas pressure switch. (For proper adjustment, use the attached manometers, if available, to set pressure. The scales on the switch are approximate only.) Low gas pressure switch must be set at 5.0 in. WC for natural gas and 10.0 in. WC for propane gas.

8.Make sure that the high gas pressure switch (op- tional) is set to 1.0 in. WC above manifold pres- sure.

Follow-Up

Safety checks must be recorded as performed.

Turn heater on. After main burner ignition:

1.Check manometer for proper reading.

2.Cycle heater several times and re-check readings.

3.Remove all manometers and replace caps and screws.

4.Replace all gas pressure caps.

5.Check for gas leaks one more time.

Pilot Turn-Down Test

The Hi Delta heaters, depending on their size, have one to three burner sections. Each burner section is supplied gas by gas valves incorporated into a 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 ignited 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 burn- er sections on either side of the supervised section (pilot) are electrically interlocked with the supervised ignition system so as they are not 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 step 1 above.

4.Gradually reduce manifold pressure (flame) on supervised burner section by slowly closing man- ual gas valve. Watch for shut-down due to loss of supervised flame signal as pressure is being re- duced. Flame signal should be lost before mani- fold pressure goes below 2.0 in. WC for natural gas and 6.0 in. WC for propane gas.

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 Fig. 41. The numbers on the diagram refer to the steps below:

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

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Raypak 302A-902A manual Safety Inspection, Follow-Up, Pilot Turn-Down Test, Leak Test Procedure Dual-Seat Gas Valves
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302A-902A specifications

The Raypak 302A-902A is a highly regarded pool and spa heater, known for its efficiency and reliability in delivering warmth to residential and commercial aquatic applications. This heater stands out due to its robust design, advanced technology, and user-friendly features.

One of the key characteristics of the Raypak 302A-902A is its dual fuel capability, which means it can run on either natural gas or propane. This flexibility allows users to choose their preferred fuel type, contributing to operational efficiency and cost-effectiveness. With a BTU output ranging from 302,000 to 902,000, the Raypak heater is capable of quickly heating large volumes of water, making it ideal for pools, spas, and hot tubs.

The heater incorporates advanced technology such as a stainless steel heat exchanger, which not only ensures excellent thermal conductivity but also promotes durability against corrosion. This is especially advantageous in harsh environments, where exposure to chemicals can significantly impact the lifespan of traditional copper heat exchangers. The Raypak 302A-902A's heat exchanger is designed to withstand the rigors of constant use while maintaining high performance levels.

Another prominent feature of the Raypak 302A-902A is its digital display control system, which simplifies the operation and monitoring of the heater. Users can easily set and adjust temperatures, as well as access diagnostic information, all through an intuitive interface. This digital control not only enhances user experience but also aids in the timely maintenance of the unit.

Energy efficiency is another major selling point of the Raypak 302A-902A. The heater is designed with environmentally friendly practices in mind, utilizing a low NOx burner that minimizes harmful emissions. This not only meets environmental regulations but also makes it a greener alternative for heating needs.

In terms of installation, the compact design of the Raypak 302A-902A allows for versatile placement options, whether in a residential backyard or a commercial environment. Its user-friendly installation process ensures that homeowners and businesses alike can enjoy the benefits of heated water with minimal hassle.

Overall, the Raypak 302A-902A is an exemplary choice for anyone seeking a high-quality, efficient, and flexible pool and spa heating solution. Its combination of robust engineering, advanced technology, and user-focused features solidifies its position as a leader in the market, promising effective heating for years to come. Whether for personal enjoyment or commercial use, this heater delivers exceptional performance that meets diverse heating needs.
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