Fig. 28: External LED Indicator Decal

Heater Sequence of Operation

Models 302A, 402A, 502A, 652A, 752A and 902A

1.The black (hot) wire lead goes directly to the main power switch. This black toggle switch is located at the middle front of the control compartment.

2.When the main power switch is placed in the “ON” position, 120 VAC is applied to the 120 VAC termi- nal block on the circuit board and the 120/24 VAC transformer is powered.

3.120 VAC is waiting at the N.O. contacts of the Economaster II pump delay.

4.Terminals L1 and F1 of the ignition module are powered with 120VAC.

5.120 VAC power is also applied to the control power connector on the circuit board.

6.120 VAC power is waiting at relay contacts K-3 to energize the heater blower.

7.The 120/24 VAC transformer outputs 24 VAC.

8.24 VAC is sent to the low water cut-off (optional) and the red power light is energized.

9.24 VAC is applied to the blue power light located on the diagnostic display board.

10.24 VAC is also applied to the red LED safety shut- down light on the front diagnostic board.

11.24 VAC is applied to the alarm circuit (optional). If the E-5 sales option (Alarm) is included a 5 sec- ond time delay relay will not allow the alarm to so-

und unless the circuit stays energized for more than 5 seconds.

12.Power is applied to terminal P1-1 of the U-2 Board. All safeties are verified to ensure that it is safe to operate the heater. The safety compo- nents wired into the diagnostic board are: low water cut-off (optional), blocked vent switch, man- ual vent temp switch (optional), manual reset high limit, low gas pressure switch (optional), high gas pressure switch (optional), and auto-reset high limit (optional).

13.Power is applied to terminal TP-1 of the Economaster II pump delay to energize the circuit board.

14.Once all safeties have been verified to be closed, a 24 VAC signal is output from pin P3-16 of the U- 2 Board.

15.Relay K-1 (N.C.) will now be energized, and opens the N.C. contacts to disable the alarm (optional) and turns off the red safety shutdown light.

16.Pin P1-4 on the diagnostic board will now output a 24 VAC signal to pin 1 of the “standby switch”.

17.The “standby switch” (rocker switch) located at the lower left front of the control compartment is now powered. If the switch is “ON” and there is no call for heat (CFH), the heater is in standby mode.

18.After the standby switch is placed into the “ON” position, a 24 VAC signal is sent to the “enable/disable” connection (normally jumpered).

19.24 VAC switched power is applied to the S24V ter- minal on the ignition module.

20.When the “enable/disable” contacts are closed, the 24 VAC signal travels to pin 1 of the stage 1 connection and waits for a CFH.

21.When a CFH occurs, a 24 VAC signal is sent to the CFH light on the diagnostics panel located on the lower left front of the control compartment.

22.Power is now sent to terminal TP4 of the Economaster II to energize the relay and close the contacts.

23.The heater pump is energized upon relay closure of the Economaster II.

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Raypak 302A-902A manual Heater Sequence of Operation, Models 302A, 402A, 502A, 652A, 752A and 902A
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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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