Copper-fin II/IIE Boiler, Water Heater and Pool Service Manual

1 Service (continued)

Sequence of operation

Table 1A_Sequence of Operation - Space Heating and DHW

OPERATION

DISPLAY

 

 

1. The manual reset high limit (optional) must be closed before

HTR: Standby

any action will take place.

OUT: 123.8F(129)

 

2.Upon a call for heat the control turns on the appropriate HTR: Standby

pumps (system and boiler pumps for space heating; DHW OUT: 123.8F(129) pump for DHW call). The flow switch and low water cutoff

(if equipped) must close.

3.• The gas pressure switch(es) (if equipped) must close.

• The louver proving input must close.

HTR: Standby

• If the air pressure switch is open, the prepurge cycle then

begins by starting the combustion blower. Once started,

OUT: 123.8F(129)

the air pressure switch must close.

 

4. After the 15 second prepurge, the blower slows down and

HTR: PREPURGE

 

the hot surface igniter (HSI) is energized. The HSI is heated

 

for at least 20 seconds.

OUT: 123.9F(129)

5.

Once the HSI is hot, the trial for ignition begins with the

HTR: IGNITION

 

opening of the gas valve.

OUT: 123.9F(129)

 

 

6. If the SMART SYSTEM control does not sense flame, then

HTR: POSTPURGE, PREPURGE

 

it will lock out.

OUT: 123.9F(129)

 

 

 

7.

If the SMART SYSTEM control senses flame,

 

 

it will fire the burner to maintain the set point. The

HTR: RUN STG: 1

 

stages will fire as required to hold the actual temperature at

 

the set point. If the boiler lights due to a space heating call for

OUT: 124.8F(129)

 

heat, and the ramp delay function is active (default is

 

 

disabled), the stages will be held to a series of increasing

 

 

limits after the burner has lit.

 

8.If the space heating call for heat is active, and the DHW thermostat closes, the control will turn on the DHW pump,

wait 2 seconds, and then turn off the boiler pump. This will HTR: DHW STG 123

divert the hot water away from the heating zone(s) and send OUT: 177.8(180) it to the DHW tank instead. The control will then fire the

stages to maintain the outlet temperature to the DHW boiler set point.

9

Page 8 Page 10
Page 9
Image 9
Lochinvar 502 - 2072, 402 - 2072 service manual Sequence of operation, OUT 123.8F129
Page 8 Page 10

502 - 2072, 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