Power passes to N.C. supply overload contact

(ST1 OL)

Power passes through N.C. contact on optional freeze protection timer (RT4) which remains closed if the temperature has remained above the set point

Power passes to optional inlet damper which opens

When damper is fully opened, damper relay

(D1) is energized and optional N.O. damper limit switch (DL1) closes

Power passes to and energizes supply starter relay (RF)

Power passes to N.O. fan contact (RF), which is energized and closed

Supply starter (ST1) is energized

Supply starter contact (ST1) closes and power reaches and energizes supply fan

Supply fan (M1) starts

3a. Heat Contact (S4) Closed - Pilot Ignition

Power passes to N.O. fan relay (RF) which is energized and closed

Power passes to optional inlet air sensor contact

(TS4) which is energized and closed if the inlet air temperature is below the set point

Power passes to and energizes the heat relay

(RH)

N.O. heat relay contact (RH) closes

Power passes to and energizes terminal 5 of the

Flame Safeguard (FSG). Power light on FSG is on.

Power passes to N.C. high limit control contact

(HLC1) which is closed if temperature has remained below set point

Power passes to optional N.O. and N.C. high and low gas pressure contacts (PS4 and PS3), which are both closed if gas pressure is within the set range

Power passes to terminal 6 of the Flame

Safeguard (FSG)

Power begins direct gas burner sequence

(see Direct Gas Burner Sequence)

3b. Heat Contact (S4) Closed - Direct Spark

Power passes to N.O. fan relay (RF) which is energized and closed

Power passes to optional inlet air sensor contact

(TS4) which is energized and closed if the inlet air temperature is below the set point

Power passes to and energizes the heat relay

(RH)

N.O. heat relay contact (RH) closes

Power passes to N.C. high limit control contact

(HLC1) which is closed if temperature has remained below set point

Power passes to optional N.O. and N.C. high and low gas pressure contacts (PS4 and PS3), which are both closed if gas pressure is within the set range

Power passes to N.O. and N.C. airflow switches

(PS2) which are closed if there is proper airflow across the burner

Power passes to terminal TH on the Flame

Safeguard (FSG) which begins it’s sequence (see Direct Gas Burner Sequence)

Direct Gas Burner Sequence - Pilot Ignition

1.Supply Fan Contact Closed

Power passes to the supply fan and heat switch

2.Heat Contact Closed

Power passes to the heat relay then to the Flame

Safeguard

3.Flame Safeguard (FSG) Sequence

Checks for proper airflow

Verifies no flame present at burner

Initiates 10 second prepurge

Sends power to open pilot gas valve (V1) and energizes the spark generator (SG) (clicking of the spark generator may be heard)

Tries for up to 10 seconds to light pilot and confirm flame

Powers the main gas valves open

Shuts down spark generator

Continuously monitors the flame and airflow

Performs self-diagnostic check every five seconds.

Direct Gas Burner Sequence - Direct Spark

1.Supply Fan Contact Closed

Power passes to the supply fan and heat switch

2.Heat Contact Closed

Power passes to the heat relay then to the Flame

Safeguard

3.Flame Safeguard (FSG) Sequence

Checks for proper airflow

Verifies no flame present at burner

Initiates 15 second prepurge

Sends power to open gas valve (V2) and energizes the spark generator (clicking of the spark generator may be heard)

Tries for up to 10 seconds to light and confirm flame

Shuts down spark generator

Continuously monitors the flame and airflow

Model VSU Make-Up Air 21

®

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Greenheck Fan 470654 manual 3a. Heat Contact S4 Closed Pilot Ignition, 3b. Heat Contact S4 Closed Direct Spark

470654 specifications

Greenheck Fan 470654 is a cutting-edge ventilation solution designed to meet the demanding requirements of commercial and industrial applications. Renowned for its reliability and efficiency, this fan model integrates advanced technologies and engineering to provide optimal air movement and control.

One of the standout features of the Greenheck Fan 470654 is its robust construction. Designed with high-quality materials, the fan promotes longevity and durability, making it suitable for use in tough environments. This fan features a heavy-gauge steel housing that minimizes vibration and enhances noise reduction, contributing to a quieter operation, a critical factor in maintaining a serene working environment.

The fan is equipped with a powerful motor that ensures efficient airflow, achieving high performance while consuming minimal energy. This energy efficiency is emphasized through the use of advanced motor technology, including variable frequency drive (VFD) compatibility. VFDs allow for precise control of the fan speed, enabling adjustments based on system demand, thus significantly reducing energy consumption and operating costs.

In terms of airflow performance, the Greenheck Fan 470654 is engineered to provide a high volume of air movement while maintaining static pressure. Its aerodynamic design minimizes resistance, enhancing overall efficiency. The fan is designed to operate across a range of static pressures, making it versatile for different applications, from commercial kitchens to large manufacturing facilities.

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Safety features are a priority in the design of the Greenheck Fan 470654. It includes protective features such as thermal overload protection to prevent motor damage and extend operational life. The fan's design also adheres to industry standards and regulations, providing peace of mind for users.

In summary, the Greenheck Fan 470654 is a well-engineered solution that combines durability, efficiency, and advanced technology to deliver superior performance in ventilation applications. With its powerful motor, energy-saving capabilities, and ease of installation and maintenance, it stands out as a reliable choice for professionals seeking optimal airflow management.