SECTION C: Installation

To make an adjustment to a setting in the control, begin by selecting the “ADJUST” menu. To change from the view menu to the adjust menu, simultaneously press and hold all three buttons for 1 second. The menu name, “ADJUST” will be displayed in the menu field.

The menu will automatically revert back to the view menu after 20 seconds of keyboard inactivity. Then scroll to the desired item using the scroll button. Fi- nally, use the ▲or ▼ button to make the adjustment.

In the absence of other information, the values pro- vided in Table N should be used as default settings.

Heater Sequence of Operation

Model 503 - 1503

1.The black (hot) wire lead, located at the right- middle front inside the control compartment, goes directly to the main power switch.

2.When the main power switch is placed in the “ON” position, the 120 VAC terminal block in the control compartment, the N.O. contacts of pump relay, the N.O. contacts of blower relay, the 120/24 VAC transformer, and terminals L1 and F1 of the ignition module are powered.

3.The 120/24 VAC transformer sends a 24 VAC hot power signal to the 24V Terminal Block .

4.24 VAC is sent from the 24V Terminal Block to the NO pump contacts on the modulating tempera- ture control (pin #13), to pin TP2 of the optional alarm relay, to terminal R of the alarm circuit on the modulating temperature control (pin #24) and the green “Power On” LED on the front of the heater will illuminate.

5.24 VAC power is sent from 24V Terminal Block to Pin P1-1 of the UDB board, the 24 VAC termi- nal of the ignition control module, the NC contact of the manual high limit, and L1 of the Low Water Cut Off (if equipped).

24 VAC is sent from the NC contacts of the man- ual high limit to pin P3-1 & P3-2 of the UDB board.

Upon loss of water in the heater, the Low Water Cut Off (if equipped) will send a 24 VAC signal to pin P3-4 of the UDB board to indicate a safety fault.

6.A 24 VAC signal is sent from the NO contacts of the Low Water Cut Off to the common terminal of the Blocked Vent Switch.

During a blocked vent condition a 24 VAC signal is sent from the NO open contacts of the Blocked Vent Switch to pin P3-5 of the UDB board to indi- cate a safety fault.

7.During normal operation of the heater the 24 VAC signal exits the NC contacts of the Blocked Vent Switch and is sent to the common terminal, of the Low Gas Pressure Switch (if equipped).

During a low gas pressure condition 24 VAC is sent from the NC contacts of the Low Gas Pres- sure Switch to pin P3-6 of the UDB board to indicate a safety fault.

8.24 VAC is sent from the NO contacts of the Low Gas Pressure Switch to the common terminal of the High Gas Pressure Switch (if equipped).

During a high gas pressure condition 24 VAC is sent from the NO contacts of the High Gas Pres- sure Switch to pin P3-7 of the UDB board to indicate a safety fault.

9.24 VAC is sent from the NC contacts of the High Gas Pressure Switch to the common terminal of the Auto Reset High Limit (if equipped) and to en- ergize the coil of optional alarm relay.

If the Auto Hi Limit opens, 24 VAC is sent from the NO contacts of the Auto Hi Limit to pin P3-3 of the UDB board to indicate a safety fault.

10.24 VAC is sent from the NC contacts of the Auto Reset Hi Limit to the common terminal of time de- lay relay.

11.24 VAC is sent from the NC contacts of time delay relay to the common terminal of the burner switch located on the front exterior panel of the heater.

12.Power then travels to the enable/disable connec- tion and to the Ht D (heat demand) connection of the modulating temperature control.

Power splits from the enable/disable and goes to the stage contact of the modulating temperature control (pin #15).

13.When the stage contact closes on the modulating temperature control, 24 VAC is sent to the com- mon terminal of the flow switch and to pin P1-3

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Raypak 503-2003 manual Heater Sequence of Operation, Model 503
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503-2003 specifications

The Raypak 503-2003 is a notable entry in the world of water heating solutions, renowned for its efficiency and reliability in both residential and commercial settings. This model is designed to provide exceptional performance while maintaining ease of use and minimization of environmental impact.

One of the standout features of the Raypak 503-2003 is its advanced heating technology. The unit utilizes a durable, copper heat exchanger which ensures quick and efficient heating of water. This heat exchanger is known for its ability to transfer heat effectively, leading to reduced energy consumption and lower utility bills. The design also allows for a seamless operation, ensuring that the system heats water swiftly without sacrificing performance.

In addition to its efficient heating capabilities, the Raypak 503-2003 is equipped with innovative controls. The digital control panel allows users to easily set and adjust the desired water temperature. This feature provides a level of convenience that simplifies operation while enhancing user experience. Furthermore, the smart technology employed in the unit ensures that it operates within optimal parameters, avoiding unnecessary energy expenditure.

Durability is another hallmark of the Raypak 503-2003. Built with heavy-duty components, this water heating solution is designed to withstand the rigors of continuous use. The rugged construction ensures longevity, making it a cost-effective investment for homeowners and businesses alike. Moreover, the unit is designed to be resistant to corrosion and wear, further extending its lifespan and reliability.

The energy efficiency of the Raypak 503-2003 is a crucial characteristic that sets it apart from competitors. Rated with a high efficiency score, this model contributes to lower emissions and is environmentally friendly. It adheres to various energy standards, making it a suitable choice for those looking to reduce their carbon footprint while enjoying reliable water heating.

Noise reduction is another important feature of the Raypak 503-2003. Designed with quiet operation in mind, the unit operates with minimal noise pollution, allowing for a pleasant environment in both residential and commercial spaces.

In summary, the Raypak 503-2003 combines advanced heating technology, user-friendly controls, durability, and energy efficiency into a robust water heating system. This makes it an excellent choice for those in need of dependable and sustainable heating solutions. Whether for daily home use or for larger commercial applications, the Raypak 503-2003 stands out as a leader in its class.
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