Principles of Grain Drying
38
A — Single and Triple Fan/Heater Location
A* — Single and Triple Burner Control Location
B — Dual and Triple Fan/Heater Location
B* — Dual Burner Control Location
Fan, Heater, and Controller Locations
Proper fan and heater placement is critical so that airflow and heat are evenly distributed under bin floor. By
placing a heater downstream between fan and transition, air moves through fan and is heated. Because air
expands as it is heated, additional drying capacity is obtained.
Controls must be located between the primary and one of the secondary fan and heater units. When utilizing two
or three fan and heater combinations on same bin, a dual or triple burner control must be used When two or more
fans are placed on a bin, use a high-low or thermostat control, which can be controlled through a dual or triple
burner control (modulating valve-controlled heaters may
not
be used in any dual or triple applications).
Additionally, plenum temperature should be monitored on outboard sides of any dual or triple fan and heater
combinations. Sukup Manufacturing Co. suggests that plenum temperature always be monitored all the way
around a bin. Checking bin sidewall with a bare hand in plenum area allows easy detection of hot or cold spots.
Illustration below shows appropriate locations for single, dual and triple fan and heater units and their controls.
Figure 46
- Proper Fan, Heater, and Controller Placement on Bins
Note
: When triple fans and heaters are used, “A” becomes primary unit. On dual fan and heater units, either unit
may be primary.
Air-straightener vanes must be included in axial fan or heater to provide proper burner operation and even heat
distribution in bin plenum. Centrifugal fans may be equipped with either upstream or downstream heaters. Either
location may be used with low-temperature heaters. For high-temperature operations, downstream heaters are
preferred to provide greater drying capacity. Sukup and Chicago downstream heaters are equipped with
adjustable air-deflecting devices so that heat distribution in plenum can be altered if necessary.
Type of Fuel
Use of propane or natural gas is based on availability. Burners for both fuels can be sized to provide required
heat. When using propane as a fuel, either liquid or vapor may be used. Generally, a heater must include a
vaporizer for liquid propane when ambient temperature is below 32°F (0°C), and 1 million Btu/hr (292 kW) is
required. See Sukup heater manual for sizes of propane tanks required when using vapor propane.
When seeking to use natural gas as fuel, contact gas company to determine whether adequate line pressure is
available for operation. Some companies may be unable to provide a sufficient natural gas supply. For high-
temperature heaters, 15 psi (100 Kpa) supply pressure while operating is required to reach maximum Btu/hr
(kW/hr) capacity from heater. If a natural gas company cannot supply this, a heater with larger piping (e.g. 1-1/4”
or 31.75 mm) should be used. Electric heaters provide 1°F to 4°F (1°C to 2°C) of temperature rise. Usually, LP or
natural gas burners provide a lower operating cost than electrical heaters.
Содержание Fastir
Страница 4: ...Limited Warranty 4 LIMITED WARRANTY...
Страница 49: ...Appendix A Wiring Diagrams 49 APPENDIX A WIRING DIAGRAMS Figure 51 Single Auger Fastir Wiring Diagram...
Страница 50: ...Appendix A Wiring Diagrams 50 Figure 52 Double Auger Fastir Wiring Diagram...
Страница 51: ...Appendix A Wiring Diagrams 51 Figure 53 Triple Auger Fastir Wiring Diagram...
Страница 52: ...Appendix A Wiring Diagrams 52 Figure 54 Quadruple Auger Fastir Wiring Diagram...
