5 Electrical connections

Line voltage connections

1.Connect 120 VAC power wiring to the line voltage terminal strip in the junction box, as shown in FIG. 5-1.

2.Provide and install a fused disconnect or service switch (15 AMP recommended) as required by the code (see FIG. 5-1).

3.To activate a system pump, wire as shown in FIG. 5-1. If the motor is larger than 1 HP, you must install a contactor.

4.When connecting power to units which are to be cascaded, each unit must be connected to the same ground connection.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BOILER ONLY

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

UNIT

 

UNIT PUMP

 

 

 

SYSTEM

DHW PUMP

 

 

SUPPLY

 

 

 

SUPPLY

PUMP SUPPLY

 

 

SUPPLY

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L N G

 

 

 

L N G

 

 

 

 

 

L N G

 

 

 

 

 

L N G

 

 

 

Installation & Operation Manual

EMS or remote thermostat connection

An EMS, remote thermostat or other remote temperature control may be connected to the boiler (see FIG. 5-3). 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. 5-4 on page 46.

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

D

I

S

C O N N E C T

D

I

S

C

O

N

N

E

C

T

BOILER

PUMP

GROUND

SPLICE

D

I

S

C

O

N

N

E

C

T

SYSTEM

PUMP

120V RELAY

D

I

S

C

O

N

N

E

C

T

DHW

PUMP

120V RELAY

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.

REMOTE

CHASSIS

GROUND

 

 

 

 

 

REV A

L

N

 

R

R

LBL20175

 

 

 

120V

UNIT

SYSTEM

DHW

 

 

PUMP

PUMP

PUMP

 

SUPPLY

 

1 HP MAX

RELAY COIL

RELAY COIL

 

 

Figure 5-1_Line Voltage Field Wiring Connections

Low voltage connections

1.Route all low voltage wires through the knockouts on the left side of the heater, as shown in FIG. 5-2.

2.Connect low voltage wiring to the low voltage connection board as shown in FIG. 5-4 on page 46 of this manual and the heater wiring diagram.

LOW

VOLTAGE

KNOCKOUTS

LINE

VOLTAGE

KNOCKOUTS

Figure 5-2_Routing Field Wiring

ON/OFF

CONNECTION

Figure 5-3_Remote ON/OFF Wire Connection

DHW (Domestic Hot Water) thermostat

Connect the DHW tank thermostat (FIG. 5-4) to the tank thermostat terminals on the connection board.

DHW tank sensor

If a tank sensor is used, it must be connected to the tank sensor terminals on the low voltage connection board. The correct Lochinvar sensor (TST20015) MUST BE USED.

44

Page 43 Page 45
Page 44
Image 44
Lochinvar 402 - 2072 Line voltage connections, EMS or remote thermostat connection, Low voltage connections
Page 43 Page 45

402 - 2072 specifications

The Lochinvar 402 - 2072 is a versatile and highly efficient boiler designed to meet the heating demands of modern residential and commercial applications. This model stands out due to its innovative technologies, advanced features, and a high level of reliability, making it an ideal choice for consumers looking for an enduring and economical heating solution.

One of the primary characteristics of the Lochinvar 402 - 2072 is its impressive energy efficiency. With an exceptional annual fuel utilization efficiency (AFUE) rating, this boiler ensures minimal energy waste, allowing homeowners and business operators to save significantly on their energy bills. The model incorporates advanced condensing technology that enables it to extract heat from the combustion gases, maximizing heat transfer and reducing emissions.

The Lochinvar 402 - 2072 is built with a robust stainless steel construction that enhances durability and resilience against corrosion and other environmental factors. This material not only prolongs the lifespan of the unit but also contributes to its outstanding thermal efficiency. Additionally, the boiler's compact design allows for flexible installation options, making it suitable for various spaces, including tight utility rooms and basements.

Equipped with a user-friendly control interface, the Lochinvar 402 - 2072 allows for easy monitoring and adjustment of settings. Its advanced digital display provides real-time data on system performance, ensuring the operator can maintain optimal performance and efficiency.

Another noteworthy feature is the unit's quiet operation. The design includes sound-dampening insulation and high-efficiency circulators, keeping noise to a minimum, which is an essential trait for both residential and commercial settings.

The Lochinvar 402 - 2072 is also designed with safety in mind. It incorporates multiple safety features including an automated vent damper, low water cutoff, and a comprehensive control system that monitors various operating conditions. This proactive approach to safety ensures that potential issues are identified and addressed before they become critical.

In conclusion, the Lochinvar 402 - 2072 boiler presents an exceptional combination of efficiency, durability, and user-friendly features. Its advanced condensing technology, stainless steel construction, and focus on safety make it a leading choice in the competitive boiler market, catering to the heating needs of a diverse range of applications while ensuring environmental responsibility. For those in search of a dependable and efficient heating solution, the Lochinvar 402 - 2072 is certainly worth considering.
Top Page Image Contents