UDB Diagnostic Board

This heater is equipped with a diagnostic board which will indicate faults as they occur. Refer to the following section for instructions on accessing, reviewing and clearing these faults.

Fig. 34: Fan-Proving Switch

Fig. 35: Blocked Vent Switch

Pump Time Delay

The Economaster is a fully enclosed solid state TDR with a white jumper that selects one of two time delays. See Fig. 36. If the jumper is on pins 6 and 7 (default) the delay time is 5 minutes. If the jumper is not on pins 6 and 7, the time delay is 10 minutes.

In a conventional system, when the Aquastat is satis- fied, the main gas valve closes, but the pump continues operating. With the time delay relay the boil- er pump is programmed to continue running for an optimum period of time in order to absorb the residual heat from the combustion chamber and use it in the system. The pump then shuts off until the next call for heat is received from the Aquastat.

6

1

2

Fig. 36: Economaster Time Delay Relay (TDR)

Fig. 37: UDB Diagnostic Board

UDB Fault History

To view the fault codes in the UDB history file:

1.Press the UP or DOWN buttons on the membrane switch for 2 seconds to access the fault history.

2.Press either button to scroll through the recorded faults in history.

3.The most recent fault recorded will be the first fault displayed (the last 16 faults are stored in the his- tory, on a rolling basis). There is no time or date stamp associated with these faults.

4.When the history of faults has been exhausted, pushing the UP or DOWN buttons again will roll the fault history over and it will start again.

5.To exit the fault history, wait for 10 seconds and the board will automatically exit the history mode.

To clear the fault history, press and hold both the UP and DOWN buttons for 5 seconds while the power is on.

NOTE: Once the history has been cleared, it cannot be recovered.

Diagnostic information is provided any time a fault is recorded. This information is intended to assist in locating the problem with the heater, but is not exhaus- tive.

If multiple fault conditions occur at the same time, only the fault that caused the heater to shut down will be recorded in the history.

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Raypak 902B, 302B manual UDB Diagnostic Board, UDB Fault History, Pump Time Delay
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302B, 902B specifications

Raypak is a prominent name in the heating industry, particularly known for its advanced technology and robust design in residential and commercial heating solutions. Two of their notable models, the Raypak 302B and 402B, exemplify innovation and efficiency in hydronic heating systems, designed to meet diverse needs while ensuring optimal performance.

The Raypak 302B and 402B are high-efficiency boilers that utilize gas-fueled systems. The 302B model has a heating capacity of 302,000 BTU/h, while the 402B boasts a maximum capacity of 402,000 BTU/h. This range of heating output makes these models suitable for a variety of applications, from residential heating needs to larger commercial spaces that require a reliable heat source.

One of the standout features of the Raypak 302B and 402B is their use of fire-tube heat exchanger technology. This design promotes efficient heat transfer and allows for lower emissions, thus minimizing the environmental impact. The fire-tube design also contributes to a longer lifespan and reduced maintenance costs, making these boilers a cost-effective solution over time.

Equipped with advanced control systems, the Raypak 302B and 402B ensure precise temperature regulation and improved energy usage. The digital display provides real-time feedback and diagnostics, enhancing user experience and simplifying troubleshooting. These models are also compatible with various building management systems, providing users with versatility in integration to optimize building performance.

In addition to their technological advancements, these boilers are designed with user safety and convenience in mind. They include features such as built-in safety controls, easy access for service and maintenance, and a compact footprint to fit into tight spaces. Their robust construction ensures durability, which is crucial for systems that operate under high demand.

Moreover, both models have been engineered to succeed in various climates, making them reliable choices for users in diverse geographical locations. With their energy-efficient operation, reliable performance, and advanced features, the Raypak 302B and 402B embody quality and innovation in the heating market, ensuring comfortable environments while lowering energy costs and environmental footprints.
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