Figure 15.4 Flow Chart for Isolating Limit and APS Errors (See Table 15.3)

Push reset button on Flue Temp Limit

(Fig 14.4)

Reset Boiler

Reset Boiler

Does Boiler

Start?

Y

N

Push reset button on Supply Temp

Limit (Fig 14.4)

Does Boiler

Flue Temp Limit was open and will probably open again. Look for:

N

Start?

Y

*Fouled flue passages

*Manifold pressure too high

*Incorrect Burner Orifice

Reset Boiler

Supply Temp Limit was open and will probably open again. Look for:

*A problem with the supply sensor

*Water-side blockage in one of the boiler heat exchangers or internal boiler piping

Does Inducer

(Fan) start before

error codeN reappears?

Y

Air pressure switch is not proving airflow:

*Blockage in Vent or Intake

*Vent system too long or undersized (see Vent Section)

*Condensate in pressure switch tubing

*Leaking or kinked pressure switch tubing

*Blockage in primary or secondary heat exchanger

*Fouled Inducer Venturi

*Defective air pressure switch

Is 120VAC present

 

across Inducer?

N

 

Y

* Defective Inducer

Air switch stuck in closed position:

*Condensate in pressure switch tubing

*Kinked pressure switch tubing

*Defective air pressure switch

68

Page 70
Image 70
Crown Boiler MWC Series, MWC116ENL, MWC116ELL, MWC116ENT, MWC116ELT Flow Chart for Isolating Limit and APS Errors See Table

MWC116ENL, MWC116ELL, MWC116ELT, MWC116ENT, MWC Series specifications

Crown Boiler's MWC Series represents a commendable choice in the realm of residential and light commercial heating solutions. Specifically, models like the MWC116ENT, MWC116ELT, MWC116ELL, and MWC116ENL stand out due to their exceptional performance, reliability, and innovative features.

At the core of the MWC Series lies a robust cast iron boiler construction designed to withstand the test of time. This material not only provides durability but also enhances heat retention, thereby increasing the system's efficiency. Each model in this series is designed for natural gas or propane fuel types, ensuring flexibility based on availability and user preference.

A notable feature of the MWC116 models is the efficient heat exchanger, which enables rapid heating of water for both space heating and domestic hot water applications. With a heating capacity of 116,000 BTUs, these boilers deliver ample warmth for mid-sized homes or light commercial settings, making them a versatile option for various applications.

The MWC116ENT model is equipped with an energy-efficient electronic ignition system, which enhances reliability and efficiency. This technology reduces energy consumption, providing users with cost savings on their utility bills. Similarly, the MWC116ELT model boasts an integrated aquastat that regulates water temperature, ensuring optimal performance and comfort.

For those requiring increased venting options, the MWC116ELL model includes advanced horizontal venting capabilities, allowing for flexible installation in various environments. This feature aids in overcoming space limitations and facilitating optimal combustion conditions. The MWC116ENL, on the other hand, features a low NOx emissions configuration, making it an environmentally conscious choice for users concerned about their carbon footprint.

User-friendly controls are a characteristic hallmark of the MWC Series, enabling straightforward operation and easy adjustments. The boilers come equipped with a digital display that provides critical system information and diagnostics, streamlining maintenance efforts.

Overall, the Crown Boiler MWC Series, particularly models like the MWC116ENT, MWC116ELT, MWC116ELL, and MWC116ENL, offer an impressive blend of efficiency, flexibility, and advanced technology. These units are designed to meet contemporary heating demands while ensuring sustainable operation, making them a wise investment for comfort and performance in residential and light commercial applications alike. With reliable construction and innovative features, the MWC Series remains a top choice for those seeking effective heating solutions.