Weekly

For low-pressure heaters, test low-water cut-off device. (With at least one stage of the appliance on, depress the low water cut-off test button, appliance should shut-off and ignition fault light should come on. Depress reset button to reset).

Monthly

1.Check flue, vent, stack, or outlet dampers.

2.Test fan air pressure. (See “Blower Adjustment” on page 47.)

3.Test high and low gas pressure interlocks (if equipped). (See “Safety Inspection” on page 48.)

Semi-Annually

1.Recalibrate all indicating and recording gauges.

2.Check flame failure detection system components. (See “Pilot Turn-Down Test Procedure,” page 48.)

3.Check firing rate control by checking the manifold pressure. (See “Main Burner Adjustment” on page 47.)

4.Check piping and wiring of all interlocks and shut- off valves.

5.Inspect and clean burners as necessary.

Annually

1.Test flame failure detection system and pilot turn- down. (See “Pilot Turn-Down Test Procedure,” page 48.)

2.Test high limit and operating temperature. (See “Post Start-Up Check,” page 49.)

3.Check flame sensors.

4.Conduct a combustion test at full fire. Carbon di- oxide should be 7.5 to 8.5% at full fire for natural gas, and between 9.2 to 9.8% for propane gas; Carbon monoxide should be < 150 ppm).

5.Check coils for 60 cycle hum or buzz. Check for leaks at all valve fittings using a soapy water solu- tion. Test other operating parts of all safety shut-off and control valves and increase or decrease set- tings (depending on the type of control) until the safety circuit opens. Reset to original setting after each device is tested.

6.Perform leakage test on gas valves. (See Fig. 42.)

7.Test air switch in accordance with manufacturer’s instructions. (Turn panel switch to the “On” posi- tion until blower is proven, then turn the switch to “Off”.

As Required

1.Recondition or replace low water cut-off device (if equipped).

2.Check drip leg and gas strainers.

3.Perform flame failure detection and pilot turn- down tests.

4.Check igniter. (Resistance reading should be 40- 75 ohms at 77°F.)

5.Check flame signal strength. (Flame signal should be greater than 1 microamp).

6.Test safety/safety relief valves in accordance with ASME Heater and Pressure Vessel Code Sections VI and VII.

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Raypak 302B, 902B manual Weekly, Semi-Annually, As Required
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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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