Weil-McLain 550-141-396/0801 Piping the boiler, Wiring the boiler, Control system

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PER Series 3 Electric-Hydronic Boilers Installation Instructions

Pre-installation continued

Piping the boiler

After the boiler is secured to the wall, attach the supply and return piping. Refer to Table 2 for minimum pipe sizes.

Install manual shut-off valves in the supply and return lines to facilitate servicing the boiler. Model PER boilers are provided with a built-in air elimination system using a float-type automatic air vent. Refer to the boiler line drawings and proceed as follows:

1.Install the pressure-temperature gauge and ¾"-¼" bushing in the 1¼" x 1¼" x ¾" tee installed on the boiler supply connection. See “Dimensions” on page 12.

2.The ¾" tapping, located to the left of the supply tapping, must be used for either an automatic venting device or piped directly to a standard closed expansion tank.

3.Install the pressure relief valve in the ¾" tapping located on the top left hand side of the boiler (see “Dimensions” on page 12). Pipe the relief valve outlet to a floor drain or near the floor. Do not pipe the relief valve to any area where freezing temperatures might be encountered.

Pipe relief valve discharge line near floor close to floor drain to eliminate potential of severe burns. Do not pipe to any area where freezing could occur. Do not plug valve or place any obstruction in discharge line.

4.Connect the system supply piping to the tapping located at the right on the top of the boiler casting.

5.Connect the system return piping to the circulator flange. When solder fittings are used, be sure that the gasket is not between the flanges when the solder connection is made.

6.A Fill-Trol system is supplied with PER boilers follow the instructions attached to the valve.

Table 2 Pipe sizes and flow rates (Recommended minimum pipe size with 20°F temperature rise through boiler.)

Boiler

Maximum

Minimum

Minimum

model

flow rate

supply

return

number

GPM

pipe size

pipe size

PER-15

5.20

¾"

¾"

 

 

 

 

PER-20

6.90

1"

1"

PER-25

8.60

1¼"

1¼"

 

 

 

 

Wiring the boiler

Electric shock hazard. Can cause severe personal injury or death if power source, including service switch on boiler, is not disconnected before installing or servicing.

The Model PER electric-hydronic boilers are pre-wired for use with 240-volt, single phase, 50/60-hertz power. Refer to Figure 1 on page 13 for the reduction in boiler capacity when the line voltage is less than 240 volts.

An opening is provided in the left side of the jacket top panel for the field wiring. Refer to Dimensions, page 12, and Ratings, page 13, for recommended wire sizes.

All wiring must conform to the requirements of the National Electrical Code and any additional National, State or Local Code Requirements having jurisdiction. All safety circuit wiring should be N.E.C. Class 1. Do not use aluminum wire.

When a PER boiler is used in a zoned system, the zone valves must be powered from an independent source, and have electrically isolated end switches or isolating relays wired in parallel to the boiler thermostat terminals.

Do not attempt to power zone valves from the transformer in the boiler control system.

Control system

The control system for the PER electric boiler has electronic and thermal time delays, which are employed to sequence elements on and to sequence elements off in reverse order. The contactors used in the system disconnect all current from the heating elements.

The circulator control utilizes a single pole relay.

Low and high limit functions are combined in a dual limit control. The control system is operated from a low voltage transformer.

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Part number 550-141-396/0801

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Contents Installer UserPlease read before proceeding Hazard DefinitionsPre-installation Piping the boiler Wiring the boilerControl system Sequence of operation Call for heatCall for heat satisfied Limit control operationWiring LadderWiringDiagramTroubleshooting Symptom-No heatSymptom-Boiler does not shut down Symptom-Low heatFreeze protection when used Operating instructionsWater treatment Filling the system with waterCheckout procedure Installation and service certificateMaintenance Handling fiberglass materials Dimensions Required wire sizes and weights RatingsParts Description Weil-McLainPart number Description Weil-McLain Number Part numberParts Description Weil-McLain Part numberLimited Warranty for cast iron sections

550-141-396/0801 specifications

The Weil-McLain 550-141-396/0801 is a high-performance boiler designed to meet the heating needs of commercial and residential applications. Renowned for its efficiency and durability, this model features advanced technology that ensures reliable operation while maximizing energy savings.

One of the standout characteristics of the Weil-McLain 550-141-396/0801 is its ability to provide maximum heating output with minimal fuel consumption. Equipped with a powerful burner and efficient heat exchanger, this boiler achieves impressive efficiency ratings, making it an economically sound choice for homeowners and businesses alike. The design also incorporates features that reduce emissions, contributing to a more environmentally friendly operation.

The construction of the boiler features robust materials that enhance its durability. The cast iron heat exchanger is built to withstand extreme conditions while maintaining excellent heat retention and distribution. This not only increases the lifespan of the boiler but also minimizes maintenance costs over time. The unit is designed to operate quietly, ensuring a comfortable environment for occupants.

Advancements in technology are evident in the Weil-McLain 550-141-396/0801's control system. It is equipped with a user-friendly digital control interface that simplifies adjustments and monitoring. Users can easily set temperature levels, track performance, and diagnose issues, which allows for timely maintenance and optimal performance. Additionally, compatibility with various thermostats provides flexibility for tailored heating solutions.

Safety is a critical component of the Weil-McLain 550-141-396/0801. It includes multiple safety features such as a spill switch, low-water cutoff, and a pressure relief valve. These mechanisms ensure safe operation and protect against common boiler-related hazards.

In summary, the Weil-McLain 550-141-396/0801 is an excellent choice for those seeking a reliable, efficient, and durable heating solution. With its advanced technology, robust construction, and emphasis on safety, this boiler not only meets but exceeds the expectations of modern heating needs. Whether for residential or commercial installation, the Weil-McLain 550-141-396/0801 stands out as a preferred option among boiler systems, delivering comfort and efficiency for years to come.
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