8Field wiring

 

TM

Installation & Service Manual

 

 

 

 

 

 

￿WARNING

NOTICE

￿CAUTION

ELECTRICAL SHOCK HAZARD – For your safety, turn off electrical power supply before making any electrical connections to avoid possible electric shock hazard. Failure to do so can cause severe personal injury or death.

Wiring must be N.E.C. Class 1.

If original wiring as supplied with the water heater must be replaced, use only type 105°C wire or equivalent.

The water heater must be electrically grounded as required by National Electrical Code ANSI/NFPA 70 – latest edition.

Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation.

Installation must comply with:

1.National Electrical Code and any other national, state, provincial, or local codes, or regulations.

2.In Canada, CSA C22.1 Canadian Electrical Code Part 1, and any local codes.

Power cord connection

This water heater is designed to operate with 120 VAC and 60 Hz power supply. If allowed by local codes, connect the power cord provided with the heater to a GFI protected outlet on a separate circuit and breaker. Ensure the circuit cannot be interrupted by a switch used to control lights or other appliances.

If local codes do not allow for the use of the power cord, remove the cord from the junction box found on the side of the control support bracket (FIG. 8-2) and attach conduit to the junction box. Route the wires out of the appliance to a GFI protected outlet on a separate circuit and breaker.

Low voltage connections

1.Route all low voltage wires through the knockouts in the rear of the water heater, as shown in FIG. 8-1.

2.Connect low voltage wiring to low voltage connection board as shown in FIG. 8-3 on page 40 of this manual and the water heater wiring diagram.

Figure 8-1Routing Field Wiring

LOW VOLTAGE

WIRING KNOCKOUTS

￿WARNING Use of an extension cord is NOT allowed. If a suitable electrical outlet is not within reach

of the supplied power cord, a new receptacle must be installed or the power cord must be replaced with hard conduit as described above.

Figure 8-2Remove Power Cable

JUNCTION BOX

Runtime contacts

The electronic control closes a set of dry contacts whenever the burner is running. This is typically used by Building Management Systems to verify that the water heater is responding to a call for heat.

Auxiliary device proving switch

1.When the operation of an external limit needs to be verified before the water heater fires, remove the jumper wire from terminals X & B and connect them to the contacts on the external limit (FIG. 8-3).

Alarm contacts

The electronic control closes another set of contacts whenever the water heater is locked out or the power is turned off. This can be used to turn on an alarm, or signal a Building Management System that the water heater is down. Note that the alarm contacts will close momentarily after each call for

heat.

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Lochinvar SNA400-125, SNA500-125, SNR200-100, SNA285-125, SNR150-100 service manual Field wiring
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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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