TM

Installation & Service Manual

13 Troubleshooting

Table 13E (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Water Heater Interface

FAULT

DESCRIPTION

 

CORRECTIVE ACTION

 

 

 

 

 

 

The temperature rise across

the heat

• Verify that the system is full of water and that all air

 

exchanger has exceeded the set

has been properly purged from the system.

 

 

 

 

 

parameters for the water heater.

 

• Verify that the water heater is piped properly into the

 

 

 

heating system. Refer to Section 6 - System Piping

 

 

 

for the proper piping methods for the Shield water

 

 

 

heater.

 

 

 

 

• Check for 120 VAC to the water heater pump motor

 

 

 

on a call for heat. If voltage is not present, check the

 

 

 

wiring back to the main control board. Replace the

 

 

 

main control board if necessary.

 

 

 

 

• If 120 VAC is present on a call for heat and the water

 

 

 

heater pump is not operating, replace the pump.

 

 

 

• Verify that the water heater pump is set to the proper

Temp O/Shoot

 

 

speed or that the pump is the proper size.

 

 

Reference Section 6 - System Piping for water heater

(continued)

 

 

 

 

pump specifications.

 

 

 

 

 

 

 

 

 

Heat exchanger outlet water temperature

• Verify that the system is full of water and that all air

 

has exceeded the maximum outlet water

has been properly purged from the system.

 

 

 

 

 

temperature.

 

• Verify that the water heater is piped properly into the

 

 

 

heating system. Refer to Section 6 - System Piping

 

 

 

for the proper piping methods for the Shield water

 

 

 

heater.

 

 

 

 

• Check for 120 VAC to the water heater pump motor

 

 

 

on a call for heat. If voltage is not present, check

 

 

 

wiring back to the main control board. Replace the

 

 

 

main control board if necessary.

 

 

 

 

• If 120 VAC is present on a call for heat and the water

 

 

 

heater pump is not operating, replace the pump.

 

 

 

• Replace the main control board.

 

 

 

 

 

 

Parameters

After downloading parameters from a

• Press the ENTER/RESET button on the

display

Progr

laptop, the main control board

must be

panel.

 

(will require a manual

reset.

 

 

 

 

 

reset once the condition

 

 

 

 

has been corrected. Press

 

 

 

 

the RESET button on the

 

 

 

 

display to reset.)

 

 

 

 

 

 

 

 

 

 

 

• Check condensate tube from unit to floor drain for

Blocked Drain

 

 

proper installation and obstructions.

 

 

 

 

 

SW

The blocked drain switch has

detected

• Inspect condensate trap for blockage.

Clean if

(will retry after 5

necessary.

 

excessive condensate build up inside the

 

minutes. RESET may be

 

 

unit.

 

• Check for loose wiring connection at wire harness

pressed after condition is

 

 

plug.

 

corrected.)

 

 

 

 

 

 

 

 

 

 

• Bad blocked drain switch. Replace switch.

 

 

 

 

 

 

66

Page 65 Page 67
Page 66
Image 66
Lochinvar SNR200-100, SNA500-125, SNA285-125, SNR150-100, SNA400-125 service manual Parameters, Progr
Page 65 Page 67

SNA400-125, SNR150-100, SNA285-125, SNR200-100, SNA500-125 specifications

Lochinvar has established itself as a leader in the realm of high-efficiency heating solutions, and its line of condensing boilers, including the SNA500-125, SNR200-100, SNA400-125, SNA285-125, and SNR150-100, exemplifies the brand’s commitment to innovation, efficiency, and reliability.

The SNA500-125 model stands out with its impressive heating capacity, designed for larger commercial applications. Featuring advanced modulating burners, it can precisely adjust its output based on real-time demand, significantly enhancing energy efficiency. The stainless steel heat exchanger ensures robust durability and improved thermal performance, while the integrated controls offer advanced diagnostic capabilities and user-friendly operation.

Next in the lineup, the SNR200-100 serves as a versatile option for mid-sized applications. Its compact design allows for flexible installation, making it a valuable choice for facilities with limited space. The boiler incorporates a high-efficiency combustion system that maximizes fuel utilization, while its low NOx emissions technology aligns with environmental standards, reducing the carbon footprint of users.

The SNA400-125 delivers a robust solution for diverse heating needs, equipped with state-of-the-art modulation technology that not only optimizes efficiency but also offers quiet operation – a crucial feature for facilities where noise reduction is paramount. This model also includes built-in redundancy options, enhancing reliability during peak operational periods.

The SNA285-125 provides a balance of performance and efficiency for smaller commercial settings. Its innovative control system offers precise temperature management and easy integration with existing systems. Energy Star certified, this model is not only cost-effective but supports sustainability efforts in various industries.

Lastly, the SNR150-100 is ideally suited for light commercial applications, featuring a compact footprint and excellent heat transfer capabilities. The user-friendly interface and robust safety features make it an excellent choice for operators prioritizing both ease of use and reliability.

All these models incorporate Lochinvar's commitment to superior design and advanced technologies, setting a benchmark in the high-efficiency heating market. With a focus on long-term performance and compliance with modern environmental standards, Lochinvar continues to deliver top-tier solutions tailored to meet diverse customer needs. Whether for large-scale operations or smaller settings, these boilers represent a significant advancement in commercial heating technology.
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