GT INSTALLATION AND OPERATION INSTRUCTIONSPage 37

Problem

Detected Problem

 

Solution

 

 

 

 

ASO

This is displayed when the boiler is

1.

Are the vinyl tubes connected between

Indicates that the

expecting the air switch to be closed by a

 

the air switch and the ports on the inlet

Air Switch is Open

differential pressure generated when the

 

pipe. Negative side of switch connects

 

combustion blower turns on. It can occur

 

to the port on the 1 1/2 in, 38 mm,

 

momentarily during normal operation.

 

ABS elbow.

 

A problem is indicated when ASO is

2.

Check for blockage on the intake and

 

displayed continuously.

 

exhaust vents.

 

 

3.

If fan is running, air switch may be faulty,

 

 

 

ensure that it’s set for 0.2 in, 5.1 mm WC.

 

 

 

The GT-400 condensate drain switch

 

 

 

must be set at 3 in, 76 mm WC.

 

 

4.

If fan is not running, check 120V wiring

 

 

 

to blower, if ok remove low voltage

 

 

 

harness from blower, if blower fails to

 

 

 

start, replace blower, if blower does

 

 

 

start problem may be with blower or

 

 

 

Sentry control.

 

 

 

 

ASC

This is displayed when the boiler has

1.

Is the fan running. If so check for 24V

Indicates that the

turned the blower off and is expecting

 

between C and D terminals, see wiring

Air Switch is Closed

the air switch to be open. It can occur

 

diagrams. If 24V is not present replace

 

momentarily during normal operation.

 

transformer.

 

A problem is indicated when ASC is

2.

Check venting termination with

 

displayed continuously.

 

required venting described in manual.

 

 

 

 

Ignition Sequence

Check for 24 Volts between terminal B1

1.

If there is 24V, indicates faulty wiring

not activated when

on Sentry & Ground.

 

between BI and W1 on Fenwal, or

burner light is on

 

 

faulty Fenwal.

(Fan is on and

 

2.

If 24V is not present proceed to next

Fenwal not flashing)

 

 

step.

 

 

 

 

 

Check for 24 Volts between terminal F1

1.

If 24V exists here but not at B1,

 

on Sentry & Ground.

 

indicates faulty relay inside Sentry,

 

 

 

contact NTI, replace control.

 

 

2.

If 24V is not present check for 24V

 

 

 

at transformer.

 

 

3.

If 24V exists at transformer, check

 

 

 

wiring and safety limits. If 24V not

 

 

 

present at transformer, check wiring

 

 

 

and replace transformer if necessary.

 

 

 

 

Water Safety Limit trips (Automatic reset)

May be caused by an error in the reading

 

Located in the supply manifold inside the

of the water temperature by the Sentry

 

boiler cabinet.

control. Watch cycle, and ensure the

 

 

Sentry is displaying the correct water

 

 

temperature and is modulating.

 

 

 

 

 

This device protects the boiler from

 

 

overheating due to a lack of flow passing

 

 

through the unit when the burner is on.

 

 

FLOW MUST NEVER BE BLOCKED BY

 

 

ANY VALVES INCLUDING MIXING OR

 

 

ZONE VALVES.

 

 

Install unit as described in this manual.

 

 

 

 

Page 36 Page 38
Page 37
Image 37
Smith Cast Iron Boilers GT Series Indicates that, Air Switch is Open, Air Switch is Closed, Ignition Sequence, Fan is on
Page 36 Page 38

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.
Top Page Image Contents