GT INSTALLATION AND OPERATION INSTRUCTIONS

Page 31

Figure 43 - Operational Flow Chart

 

120v Power

 

Displays version

 

Boiler in

 

 

Applied

 

t2.0 or t4.0

 

standby Mode

 

 

 

 

 

Indirect thermostat or flow

Thermostat End switch

 

 

 

 

switch closes A-C

 

or relay closes T-C

Energizes 3 way

Combi model

Combi or

 

(Call for Domestic)

Awaiting

(Call for Heat)

diverter valve

 

indirect

 

 

 

Input

 

 

Indirect

 

 

 

 

Energizes Primary

Energizes Primary

Water

Energizes Indirect Pump

 

 

Heater

(Ap) turns off C1

 

 

Pump (C1)

Pump (C1)

 

 

 

 

 

 

 

 

 

 

 

 

 

Air

 

 

 

Error

 

 

Closed

Switches

 

Sentry 2100

(Call for Ignition)

ASC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Open

 

 

Sentry 2100

 

 

 

 

 

Sentry 2100

 

24 Volt signal

 

 

 

 

 

 

 

 

 

 

 

to blower

 

 

 

 

 

24 V

 

 

 

 

 

 

Sentry 2100

Manifold & Stack Limit

 

 

 

 

 

Fan to SFS (75)

 

 

 

 

Open

(GT 150 & GT 200)

 

 

 

 

 

 

 

Open

 

Closed

 

 

 

Manifold Limit & Flow

 

NC

 

 

NO

 

 

Switch

 

Hi pressure

Closed

 

 

 

 

(GT 400)

Error

N. C. switch on

 

 

 

 

 

 

GT 400 only

 

 

 

 

 

 

ASO

 

 

 

 

 

 

24 V

 

 

 

 

 

 

 

 

 

Power to ignitor

Prepurge

 

IGNITION MODULE

 

 

 

 

 

 

 

 

120v from S1

 

 

S1 L1 L2 S2 W MV GND

 

 

Igniter warm-up

 

 

 

 

 

 

 

 

 

 

 

 

 

5 seconds

 

 

 

 

 

Three retries

 

 

 

 

 

 

 

 

 

 

 

 

 

 

for flame

Power to Gas valve

Flame Probe

Sentry 2100

Modulates fan based

upon setpoint and

programming

Signal <1 microA

Less than 1.0 microA

Greater than 1.0 microA

Call for flame ends

Page 31
Image 31
Smith Cast Iron Boilers GT Series manual Operational Flow Chart

GT Series specifications

Smith Cast Iron Boilers GT Series has become a benchmark in the hydronic heating industry, renowned for its exceptional performance, durability, and efficiency. This series is designed to cater to diverse heating needs, making it a popular choice among both residential and commercial applications.

One of the standout features of the GT Series is its robust cast iron construction. The cast iron sections offer superior thermal mass, allowing for better heat retention and distribution. This characteristic ensures that the boiler operates efficiently, maintaining comfortable temperatures even during extreme cold weather conditions. The engineers at Smith have meticulously designed each section to provide maximum strength and longevity, resulting in a boiler that can withstand the test of time.

The GT Series also incorporates advanced combustion technology. It utilizes a high-efficiency burner that optimizes fuel consumption, resulting in lower operating costs for homeowners and businesses alike. The boiler is engineered to accommodate a variety of fuel types, including natural gas and propane, giving users flexibility in their energy choices. This adaptability not only enhances efficiency but also promotes environmental sustainability by allowing for the use of cleaner fuel sources.

Another notable technology featured in the GT Series is the electronic control system. This system simplifies boiler operation and enhances user convenience. The intuitive interface provides real-time feedback and diagnostics, making it easier for technicians to perform maintenance and troubleshoot any issues that may arise. Additionally, the boiler’s modulating operation adjusts the burner output according to the heating demand, further improving efficiency and comfort.

Moreover, the GT Series is designed with user-friendly installation in mind. Its compact footprint allows for easy integration into existing heating systems, minimizing space requirements. Additionally, the boiler is equipped with convenient access points for maintenance, ensuring that servicing is straightforward and can be performed without extensive downtime.

Lastly, the Smith Cast Iron Boilers GT Series is designed to meet stringent safety and performance standards. Featuring multiple safety controls and systems, it provides peace of mind for users. With a commitment to quality, efficiency, and performance, the GT Series stands out as a leading solution for hydronic heating, catering to the evolving needs of today’s energy-conscious consumers.