Weil-McLain 6-20 Series operating instructions IV Gas piping, Wiring

Page 5

CSD-1ControlSystem–Propanegas

IV Gas piping

1.Contact gas supplier to size pipes, tanks and regulator.

a.Inlet gas pressure to manual main shut-off gas valve — minimum 11”W.C., maximum 13”W.C.

b.If pressure to gas valve exceeds 13” W.C., install 100% lock-up gas pressure regulator upstream of hand valve.

2.Remove gas supply knockout disc from jacket panel.

3.Follow good piping practices.

4.Pipe joint compound (pipe dope) must be resistant to corrosive action of liquefied petroleum gases. Apply sparingly only to male threads of pipe joints.

5.Install drip leg at inlet of gas connection to boiler. Where local utility requires, extend drip leg to floor.

6.Install ground joint union when required for servicing.

7.Support piping by hangers, not by boiler or its accessories.

8.Purge all air from supply piping.

9.Before operating boiler, check boiler and its gas connections for leaks.

Do not check for gas leaks with an open flame – BUBBLE TEST. Failure to use bubble test or test for leaks can cause severe personal injury, death or substantial property damage.

a.Close manual main shut-off valve during any pressure testing at less than 13” W.C.

b.Disconnect boiler and gas valve from gas supply piping during any pressure test greater than 13” W.C.

V Wiring

For your safety, turn off electrical power supply before making any electrical connections to avoid possible electrical shock hazard.

1.All wiring must be installed in accordance with the requirements of the National Electrical Code and any additional national, state or local code requirements having jurisdiction. All wiring must be N.E.C. Class 1.

2.The boiler must be electrically grounded in accordance with the National Electrical Code, ANSI/NFPA No. 70-latest edition. Use 105 °C. thermoplastic wire, or equivalent, if any of the original wire must be replaced (except for pilot spark, sense and ground wires).

3.Supply wiring to the boiler must be No. 14 gauge or heavier. Install in conduit.

4.A separate electrical circuit with a fused disconnect switch (15 amp. recommended) should be used for the boiler.

5.Refer to wiring diagrams, Figure 3 (pages 6 and 7) and Figure 5 (page 9). See section, “Wiring procedure” on page 8.

6.Figure 5 on page 9 is the Field Wiring Diagram. See Figure 3, pages 6 and 7, for the schematic and ladder wiring diagrams.

Part Number 550-141-816/0798

5

Page 4 Page 6
Image 5
Page 4 Page 6
Contents LGBGas-fired boiler 3URSDQH New installationCSD-1ControlSystem-Propanegas III Water and steam trim components IV Gas piping WiringLGB Junction box assembly dual base boilers Field wiring diagram VI Leak test procedure Starting Boiler VII Operating instructionsViii Parts List

6-20 Series specifications

The Weil-McLain 6-20 Series is designed to meet the heating needs of residential and commercial properties with exceptional efficiency and reliability. This versatile steam and hot water boiler series is known for its robust construction and innovative technologies, making it a preferred choice among heating professionals.

One of the main features of the 6-20 Series is its durable cast iron construction, which ensures longevity and superior performance. The cast iron sections provide excellent heat retention, allowing the boiler to efficiently transfer heat to the water or steam, thus enhancing overall energy efficiency. The design is optimized to withstand high pressure and temperature, making it exceptionally resilient under demanding conditions.

Efficiency is at the heart of the 6-20 Series, with models designed to achieve high Annual Fuel Utilization Efficiency (AFUE) ratings. These efficiencies are made possible through advanced combustion technology and smart controls that monitor and adjust the heating process based on real-time needs. This not only conserves fuel but also reduces greenhouse gas emissions, supporting environmentally-friendly heating solutions.

Another significant advancement in the Weil-McLain 6-20 Series is its integrated control system. The advanced boiler control features programmable settings that allow users to customize their heating cycles, enabling better management of energy consumption and operational costs. Furthermore, the boiler comes equipped with a state-of-the-art burner system that ensures clean and efficient combustion, contributing to reduced maintenance needs.

The 6-20 Series also prioritizes user-friendliness, with installation and maintenance simplified through thoughtful engineering. Its compact design allows for flexibility in placement, whether in basements, mechanical rooms, or other areas with limited space. The high-quality insulation minimizes heat loss, further enhancing efficiency and performance.

Safety features are robust in the Weil-McLain 6-20 Series, ensuring peace of mind for homeowners and building managers. Integrated safety controls help monitor the pressure and temperature levels, preventing potentially hazardous situations and ensuring optimal operation.

In conclusion, the Weil-McLain 6-20 Series stands out with its combination of rugged construction, leading-edge technology, and user-oriented design. Whether for residential or commercial applications, its efficient performance and commitment to safety make it a reliable choice for heating solutions.
Top Page Image Contents