1.Manually close the downstream leak test valve.

2.Open test point A and connect a manometer to it. Verify that there is gas pressure and that it is with- in the proper range (NOTE: must not exceed 14.0 in. WC).

3.Open test point B and connect a rubber tube to it. Connect the other end of the tube to a manometer and look for a build-up of pressure. Increasing pressure indicates a leaking gas valve.

4.Next, close the upstream manual gas valve and remove the manometer from test point A and from test point B. Connect a rubber tube from test point A to test point B and open the upstream manual gas valve. Make sure that test points A & B have been opened so as to allow gas to flow. This will bring pressure to the second valve seat.

5.Open test point C and connect a second rubber tube to it. Connect the other end of the tube to a manometer and look for a build-up of pressure. In- creasing pressure indicates a leaking gas valve.

6.Remove rubber tube and manometers. Close each test point valve as the tubes are removed.

7.Connect a manometer to each test point (one at a time) and look for a build-up of pressure. If a build- up of pressure is detected, check each test point valve to see if it is tightly closed. If leak persists, replace test point valve(s).

8.After no leakage has been verified at all valve seats and test valves, open downstream leak tests valve and restore electrical power to heater.

Fig. 42: Leak Test

This completes leak testing for a single Hi Delta mani- fold riser. Repeat steps 1-8 for each riser.

Post Start-Up Check

Check off steps as completed:

1.Verify that the heater and heat distribution units or storage tank are filled with water.

2.Confirm that the automatic air vent (if used) was opened two full turns during the venting proce- dure.

3.Verify that air has been purged from the system.

4.Verify that air has been purged from the gas pip- ing, and that the piping has been checked for leaks.

5.Confirm that the proper start-up procedures were followed.

6.Inspect burner to verify flame.

7.Test safety controls: If heater is equipped with a low water cut-off or additional safety controls, test for operation as outlined by manufacturer. Burner should be operating and should go off when con- trols are tested. When safety devices are restored, burners should re-ignite after pre-purge time delay.

8.Test limit control: While burner is operating, move indicator on high limit control below actual water temperature. Burner should go off while blower and circulator continue to operate. Raise setting on limit control above water temperature and burn- er should re-ignite after pre-purge time delay.

9.Test ignition system safety device:

a.Turn on manual gas valve. Turn power on.

b.Set thermostat to call for heat.

c.When the heater is in operation, pull cap off of tee in air switch hose. The burner should go off immediately.

d.Wait 5 minutes.

e.Reattach cap on tee. Burner should re-ignite after pre-purge time delay.

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Raypak 302B, 902B manual Post Start-Up Check, Leak Test
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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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