Primary/Secondary Boiler Piping

Installation & Service Manual

4Water connections (continued)

PUMP INSTALLATION AND MAINTENANCE: The boiler circulating pump must be purchased locally. For installation and maintenance information on the circulator pump, refer to the pump manufacturers instruction package included with the pump.

Circulator Pump Specifications

1.Maximum operating pressure for the pump must exceed system operating pressure.

2.Maximum water temperature should not exceed nameplate rating.

3.Cast iron circulators may be used for closed loop systems.

4.A properly sized expansion tank must be installed near the boiler and located on the suction side of the pump.

Circulator Pump Operation

Boilers are equipped with a relay for controlling the circulation pump for the hot water loop. The relay turns ON and OFF in response to the “W” input from the wall thermostat or zone control.

The field installed boiler pump MUST NOT exceed 1 h.p. For continuous pump operation, wire the system pump to the 120V supply. The pump should be connected at the

PERFORMANCE LOOP

These units are equipped with an integral performance loop, which is designed to provide efficiency optimization by maintaining a constant flow through the unit’s heat exchanger loop when building system flow is reduced. The performance loop assembly is standard equipment and is NOT to be used as a system or boiler pump.

	NOTICE	The performance loop is dedicated to
	NOTICE	the unit and does not affect the


		building’s system or primary/secondary
		flow characteristics and will not
		circulate the building.

It is acceptable to remove the performance loop as long as the following requirements are met:

1.The boiler is piped to the system in primary/secondary fashion.

2.The system setpoint is 140°F or higher.

3.The boiler circulating pump is sized for the appropriate flow through the boiler.

4.The system sensor is installed in an acceptable location for sensing the system supply temperature.

5.If water temperature is below 140°F a low temperature bypass must be installed, (VAL30000 - 1 1/2" LTV Valve Kit) and follow the piping diagram in FIG. 4-4.

junction box as shown in FIG. 4-3.

120V

SUPPLY

NOTICE

WARNING

If removal of the performance loop is necessary, consult the manufacturer for a Solution Without a Performance Loop (KIT30068).

Failure to install the system sensor can cause operation problems such as nuisance high limit trips.

UNIT

CIRCULATION

PUMP

TO PERFORMANCE

LOOP PUMP (OPT.)

Figure 4-3_Boiler Wiring - Circulation Pump to Junction Box

A primary/secondary piping system may also be installed to ensure proper boiler flow rates. Primary/secondary piping is also ideal for systems using a mixture of propylene glycol and water. A primary/secondary piping system uses a dedicated pump to supply flow to the boiler only. This pump is sized based on desired boiler flow rate, boiler head loss and head loss in the secondary system piping only. The secondary pump, in- stalled in the boiler piping, ensures a constant water flow rate to the boiler for proper operation. Boiler installation with a primary/secondary piping system can prevent noise problems caused by low system water flows. A primary/secondary piping system is recommended on any boiler where low water flow conditions may present an operational problem.

45,000 - 260,000 BTU/HR specifications

Lochinvar, a leader in high-efficiency heating solutions, presents the Lochinvar line of boilers, specifically the Lochinvar 45,000 - 260,000 BTU/HR models. These boilers are designed to meet a wide range of heating demands, making them ideal for residential and commercial applications alike.

One of the key features of the Lochinvar boilers is their impressive efficiency rating. Utilizing advanced condensing technology, these units can achieve efficiencies of up to 96% AFUE (Annual Fuel Utilization Efficiency). This high efficiency not only reduces fuel consumption but also lowers utility bills, making it a cost-effective solution for heating needs.

The Lochinvar boilers are equipped with a powerful heat exchanger constructed from durable stainless steel. This design not only maximizes heat transfer but also enhances the longevity of the unit. By preventing corrosion and minimizing maintenance requirements, the stainless steel heat exchanger ensures that the boiler operates at peak performance for years.

Another significant aspect of the Lochinvar boilers is their modulating burner system. This technology allows the boiler to adjust its output based on demand, ensuring that it only uses the energy necessary to maintain the desired temperature. This feature not only improves efficiency but also contributes to a more comfortable indoor environment by minimizing temperature fluctuations.

The Lochinvar series also showcases a user-friendly control interface. The advanced LCD display allows for easy monitoring and adjustment of system settings. Connectivity options are often included, providing the ability to integrate with modern building management systems for enhanced control and diagnostics.

Safety features abound in the Lochinvar models, which include built-in safeguards such as temperature and pressure relief valves, flame detection systems, and modulation cut-off to protect against overheating and other hazardous conditions.

Moreover, these boilers are designed for easy installation and maintenance. Compact dimensions and lightweight design facilitate straightforward setup, even in tight spaces. Additionally, users can take advantage of the unit’s self-diagnostic capabilities to simplify troubleshooting and reduce downtime.

In conclusion, the Lochinvar 45,000 - 260,000 BTU/HR boilers represent a pinnacle of innovation in heating technology. With high efficiency, advanced control systems, durable components, and safety features, they stand out as reliable and effective solutions for a variety of heating applications, ensuring comfort and efficiency in any environment.

Lochinvar 45,000 - 260,000 BTU/HR Primary/Secondary Boiler Piping, Circulator Pump Specifications

Models: 45,000 - 260,000 BTU/HR