Installation & Operation Manual

5 Electrical connections (continued)

Low voltage connections

1.Route all low voltage wires through the knockouts on the left side of the heater, as shown in FIG. 5-3.

Louver relay

When the heater is to control combustion air louvers, a field provided 24VAC louver relay must be installed. Connect the Louver Relay Coil terminals to the louver relay coil.

2.Connect low voltage wiring to the low voltage connection board as shown in FIG. 5-5 on page 44 of this manual and the heater wiring diagram.

LOW

VOLTAGE

KNOCKOUTS

LINE

VOLTAGE

KNOCKOUTS

Figure 5-3_Routing Field Wiring

EMS or remote thermostat connection

An EMS, remote thermostat or other remote temperature control may be connected to the pool heater (see FIG. 5-4). Follow the manufacturer’s instructions supplied with the remote temperature control for proper installation and adjustment. Connection of a set of dry switching contacts or a remote on/off thermostat to the low voltage connection board will allow the unit to be switched on and off by making or breaking a 24 VAC control circuit. Remove the factory jumper between the Staging S1 terminals on the low voltage connection board and connect the remote temperature control in its place, see FIG. 5-5 on page 44. Terminals S2, S3, and S4 are not used.

Ensure that all wiring used to connect the switching contacts of the remote temperature controller to the connection board are a minimum of 18 gauge and have a maximum installed length of 300 feet (91.4m). Set the SMART SYSTEM control to a set point temperature slightly higher than the setting of the remote temperature control. This will ensure that the remote temperature controller functions as the operating control for the heater.

Louver proving switch

The operation of a louver proving switch needs to be verified before the pool heater fires. Remove the jumper wire from these terminals and connect them to the normally open contacts on its proving switch (FIG. 5-5).

Pool return sensor - 2-wire

The pool return sensor should be installed into the return of the primary loop, making sure it is immersed in the water flow. The SMART SYSTEM control regulates the pool heater firing rate to maintain the system return temperature to the desired set point for the pool.

Pool supply/limit sensor - 4-wire

The pool supply/limit sensor should be installed into the supply of the primary loop, making sure it is immersed in the water flow. The SMART SYSTEM control limits the pool heater firing rate to maintain the system supply temperature. Factory default for the limit temperature is 110°F (43°C).

Runtime contacts

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

3-way valve out

An electric 3-way mixing valve is used to maintain 130° (55°C) temperature to the heater. Connect the Open output to the Open terminal on the 3-way valve. Connect the Close output to the Close terminal on the valve and the COM output to the 24VAC terminal on the valve. Reference the wiring diagram on page 39 of this manual.

0 - 10V rate out

A 0 - 10VDC signal is available to allow a Building Management System (BMS) to monitor the firing rate of the heater. Make sure the (-) terminal is connected to the (-) or common terminal of the external control, and the (+) terminal is connected to the

(+) or Vdc terminal of the external control.

REMOTE

ON/OFF

CONNECTION

Figure 5-4_Remote ON/OFF Wire Connection

Building Management System (BMS)

1. An external control may be connected to control either the firing rate or the set point of the pool heater. Connect the 0 - 10 VDC terminals to the 0 - 10 VDC output of the external control. The SMART SYSTEM control can be programmed to use the enable output of the BMS, or use the voltage signal to enable the heater. A BMS or a remote thermostat can be connected to the S1 terminals to enable or disable the unit in place of the factory provided jumper wire.

2. Make sure the ground terminal is connected to the ground output terminal of the external control, and the 0 - 10 V BMS IN terminal is connected to the 0 - 10 VDC terminal of

the external control.

43

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Lochinvar 2072, 502 Low voltage connections, Louver relay, EMS or remote thermostat connection, Louver proving switch
Page 42 Page 44

2072, 502 specifications

Lochinvar 2072,502 is an innovative and robust water-heating solution tailored for residential and commercial applications. This model represents a significant advancement in energy efficiency and performance, catering to the dynamic heating requirements of modern buildings.

One of the standout features of Lochinvar 2072,502 is its advanced thermal efficiency. With an impressive AFUE (Annual Fuel Utilization Efficiency) rating, the unit delivers exceptional heat output while minimizing energy consumption. This not only reduces utility bills for homeowners and businesses but also supports sustainability efforts by decreasing carbon footprints.

The Lochinvar 2072,502 incorporates cutting-edge technologies that set it apart in the market. It is equipped with advanced control systems that allow users to precisely manage heating outputs, ensuring optimal comfort while conserving energy. The user-friendly digital display provides real-time data, allowing for efficient monitoring and control.

Another significant characteristic of the Lochinvar 2072,502 is its robust stainless-steel construction. This feature enhances the unit's durability and longevity, ensuring reliable performance even in challenging conditions. The high-quality materials also contribute to maintaining consistent water temperatures, which is essential for both residential and commercial heating needs.

The Lochinvar 2072,502 operates silently, making it ideal for installations in areas where noise is a concern. Its compact design allows for flexible installation options, fitting seamlessly into various spaces, whether it’s a utility room, basement, or outdoor area.

Furthermore, the unit supports multiple venting options, accommodating different building architectures and layouts. This versatility makes it an ideal choice for new builds and retrofitting existing systems.

Maintenance is streamlined with the Lochinvar 2072,502, as it features a self-diagnostics system that simplifies troubleshooting. Regular service check-ups are made easier with accessible components, allowing technicians to perform maintenance tasks efficiently.

In summary, the Lochinvar 2072,502 stands out for its high efficiency, advanced technology, durability, and flexible installation options. It is an ideal choice for those seeking a reliable and technologically advanced water-heating solution that meets the challenges of contemporary heating demands while promoting energy savings and environmental responsibility.
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