Model 321 GP Dryer Specifications
- 321 cubic feet gas-heated dryer
- Two-door pass-through
- One-way Tilt
- PLC controls
800-1200 lbs. dry weight.
The basket shall have a volume of 321 cu. ft. and shall be constructed of 10 gauge perforated metal with 3 main and 3 secondary lifting ribs, supported by four 12” polyurethane rollers equipped with timken roller bearings and guided at each end by a total of four 6” polyurethane rollers equipped with timken roller bearings. All rollers shall be located outside of the sealed heating chamber.
The basket doors shall be a minimum of 60” in diameter and shall seal to and rotate with the basket to prevent the possibility of damage to products being dried. They shall be operated by an air over oil mechanism for smooth opening and closing. There shall be two basket doors to provide for loading at one end and unloading at the opposite end of the basket.
The basket shall be driven by v-belts around the circumference of the basket. There shall be a self-adjusting, constantly variable tension device to keep the belts properly tensioned. The belts shall be located outside of the sealed heating chamber. The basket drive motor shall be a 15 hp motor with an electronic variable frequency drive.
Optional Basket Cleaning
If specified, there shall be a device to automatically keep basket perforations open and clear of plastic residue to insure efficiency of air movement.
The main housing shall tilt a minimum of 15º to facilitate fast and easy loading and unloading of the machine. The tilt mechanism shall consist of two 8” i.d. double-cushioned air cylinders.
The burner shall be coupled to a full flame spectrum modulating system with pre-air/gas mixing for proper combustion before entering the drying chamber. The combustion chamber shall be constructed of a steel inner chamber with a steel outer jacket separated by a cooling space using the intake air as an insulator and to pre-heat the incoming air. Maximum firing rate of the burner shall be 3,500,000 btu/hr and average firing rate shall be 1,850,000 btu/hr at 15” wc pressure.
The flame modulating and temperature control shall be PLC controlled and shall control either inlet or outlet temperature, and shall dry by time, and shall cool down by time or to programmed temperature.
The exhaust blower shall be single inlet, dynamically balanced and belt driven from a 30 hp motor to afford a minimum air flow of 13,500 cfm. There shall be a device to automatically clean accumulated lint from the rotor at the beginning of each cycle.
Optional Exhaust Heat Recirculation
If specified, there shall be provided a means of automatically re-circulating heated exhaust air to further increase drying efficiency.
Optional Outside Air Makeup
If specified, there shall be a means of providing makeup air directly to the burner and combustion chamber from outside the plant to prevent negative air pressure within the plant. The inlet duct shall have a minimum diameter of 32”.
Exhaust blower 30 hp
Basket drive 15 hp
Burner blower 3/4 hp
Varies with voltage characteristics
120 fla at 230v
Maximum 150 Amp
1/2” npt connection
80 psi minimum
3/4” npt connection
80 psi minimum
2” npt connection
18” wc minimum
Minimum 30” diameter or 784 sq.
in. maximum 1.0” wc backpressure.
PLC controls shall provide:
A. Sealed, color touch-control panel to program and control machine functions including start & stop, reverse/non-reverse selection and recirculation time.
B. Full color readout of inlet & outlet temperatures, time, program number, faults, dryer cycle, excess exhaust back-pressure and other pertinent information.
C. Ninety six (96) user programmable drying formulas with multi-level password protection to prevent operators from over-riding management decisions.
D. Ability to dry by time, cool down by time or to programmed temperature, dry by inlet temperature or outlet temperature.
E. Optional ability to transfer programs to other Consolidated dryers with PLC controls.
F. Control full-flame-spectrum modulation with 40:1 turndown ratio.
G. Lint trap controls for optional Consolidated lint collector.
Optional Stainless Steel Dry Lint Collector
If specified, a stainless steel lint collector shall be built onto and integrated with dryer including integral air receiver for end-of-cycle lint blowdown. There shall be a separate lint collector automatic fire safety suppression system with alarm, but no separate utility connections to lint collector shall be required, and transition to lint collector shall be factory installed. The only connection required to lint collector shall be that of a single 30” diameter exhaust duct to the atmosphere. Lint shall automatically be removed to a large lint bag at the end of each cycle.
Interlocks, safety devices & other features shall consist of:
- Automatic fire safety suppression system with alarm
- Exhaust blower rotation sensor
- Blower burner rotation sensor
- Basket rotation sensor
- Tilt interlock safety switches
- Door safety switches
- Guards on moving parts
- Tilt and door warning bell
- Electrical interlock to prevent door and tilt mis-operation
- Door opens on power failure
- Fireye flame protection device
- Automatic gas shutdown in case of increase or reduction in gas pressure (option).
- Circuit breaker w/mechanical interlock to prevent opening of electrical panel with power on
- Thermal overload protection devices for all motors
- Both hands required to close doors
- Manual fire suppression system
- switch with guard to prevent accidental activation
- Bell and light to indicate end of cycle
- Momentary basket jogging switch
- Electronic variable frequency basket motor drive