78

L

 

 

TERMINAL

 

 

N

G

 

 

 

 

 

11

 

 

 

 

STRIP

 

 

 

 

 

 

 

 

 

 

 

BLOWER

HI/LO SPEED

 

HIGH

BLOWER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RELAY

RELAY

 

 

 

 

 

 

 

 

 

 

 

SPEED

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ON/OFF

 

 

 

 

 

 

N

UNIT PUMP

 

 

 

 

Ladder

 

SWITCH

 

HI/LO SPEED

 

 

 

 

 

RELAY

 

 

 

 

 

 

 

 

LOW

 

 

 

 

 

 

 

 

 

 

 

 

RELAY

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SPEED

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

X1

INTERGRATED

 

 

 

 

 

 

 

 

 

 

 

 

-6

 

 

 

 

 

 

BOX DEPICTS

 

 

 

 

 

CONTROL

 

 

 

 

 

 

 

 

 

 

 

 

BOARD

 

 

 

 

 

 

OPTIONAL ITEMS

 

 

 

diagram

 

 

F2

 

X1-8

 

BLOWER RELAY

 

LOW VOLTAGE

SWITCH STATES MAY VARY FROM THOSE SHOWN ON DIAGRAMS DEPENDING UPON WHETHER UTILITIES ARE CONNECTED OR A FAULT CONDITION IS PRESENT. SEE WIRING DIAGRAM FOR ADDITIONAL NOTES.

WATER OR ELECTRICITY) CONNECTED TO THE UNIT. AS SUCH, ACTUAL

WHERE POSSIBLE, SWITCHES ARE SHOWN WITHOUT UTILITIES (GAS,

 

 

3.15A

 

X2-4

HI/LO SPEED RELAY

 

 

 

 

 

120 VAC

 

 

 

F4

 

X1-2

 

UNIT PUMP RELAY

 

 

 

 

 

 

 

 

 

 

 

5A

 

 

 

SYSTEM /

 

 

 

 

 

 

 

 

 

 

TERMINAL

TERMINAL

 

 

 

 

 

 

 

 

RECIRC

 

 

 

 

 

 

 

 

STRIP

 

STRIP

 

 

 

 

 

 

 

X1-1

PUMP RELAY

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

X1-4

 

 

 

 

 

 

 

 

 

 

 

 

 

DHW PUMP

 

 

 

 

 

 

 

 

 

 

RELAY

 

 

 

 

 

 

 

 

 

STAGE 1 HSI

(BOILER)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

F5

 

X1-7

X1-10

 

 

X1-3

 

 

 

 

 

5A

 

STAGE 3 HSI

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

F6

 

X2-1

X2-2

 

 

 

 

 

 

 

 

5A

 

 

 

 

 

X1-12

 

 

 

 

 

 

 

 

 

 

 

X1-2

CHASSIS

 

 

 

 

 

 

 

 

 

 

 

Installation

X1-1

 

 

 

 

 

 

 

 

 

 

 

 

MODBUS INTERFACE BOARD

 

 

X1-3

 

 

 

CIRCUIT BREAKER OR FUSE

 

TRANSFORMER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

&

 

CIRCUIT BREAKER

 

TRANSFORMER

 

 

 

 

 

 

 

 

Operation

 

 

 

 

 

INTERGRATED CONTROL BOARD

 

 

 

 

 

 

 

 

 

 

 

X10-1

X10-2

STAGE 1 GAS VALVE

X10-5

X10-4

 

 

 

 

 

 

 

 

 

 

 

X10-3

STAGE 2 GAS VALVE

X10-6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Manual

 

 

 

 

 

 

X12-1

X12-2

STAGE 3 GAS VALVE

X12-5

X12-4

 

 

 

MANUAL RESET

 

 

 

 

 

 

X12-3

STAGE 4 GAS VALVE

X12-6

 

 

 

 

HIGH LIMIT

 

 

 

 

X6-4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Page 78
Image 78
Lochinvar 402 - 2072 operation manual Ladder, Diagram

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.