The SL series of heat transfer systems are designed for closed loop temperature control of high temperature heat transfer fluids. These completely packaged systems are designed for a maximum operating temperature of 550°F (SL550), 600°F (SL600), 650°F (SL650) or 750°F (SL750). SL Series standard components include an electric heater, centrifugal pump, thermal expansion tank, control center, strainer, supply & return valves and connecting piping mounted on a welded steel, drip proof base. Each unit is completely piped and wired and includes foam glass insulation with a metal jacket on the internal piping and heater chamber. A hot functional test is performed before shipment. The SL series is available with a variety of standard and special options.

Features

• All welded construction
• Closed cell insulation
• Drip proof base
• PID temperature controller
• High limit device with manual reset
• Expansion tank shipped loose for mounting at the highest point in the piping system
• Isolation gate valves and strainer
• SCR power control on heater circuits
• Hot functional test of system prior to shipment
• Highly customizable

Specifications

• Electrically operated
• Horizontal centrifugal pump
• 208 thru 575 Volts, 3 phase
• 20 to 360 kW and higher
• Four (4) design temperatures; 550°F, 600°F, 650°F and 750°F
• NEMA 12, 4 or 7

General

The system is pre-wired and skid mounted on a drip proof base. The sides and top are open for easy access. Each system is filled with fluid*, energized and fully tested at the factory prior to shipment. The customer is invited to the factory to receive operational and maintenance training during the testing of their new equipment. The system is designed for minimum field installation, requiring only process piping and utility connections.

Controls

The control center is designed in accordance with the National Electric Code and includes: PID temperature controller, preset high limit device with manual reset, main fused disconnect, contactors, SCR power controllers, motor starter with overloads, individually fused heater and motor circuits, control voltage transformer, power indicating lights, heater selector switch and pump start/stop push buttons, all mounted and wired in a NEMA 12 enclosure.

Safety Features

• High Limit Device
  This controller protects system by shutting down power to the heater circuits in case of excessive temperature. Manual resetting is required. This non-adjustable device is pre-set at the factory.
• Through the Door Handle
  Handle interlock between the main fused disconnect and the enclosure door prevents door from being opened when power is on.
• Non-Wicking Insulation
  The heating chamber and piping are insulated with closed cell foam glass insulation which does not absorb heat transfer fluids.
• Pump to Heater Interlock
  Control interlock between the motor starter and heater contactors prevents the heater from being energized when the pump is not operating.
• Centrifugal Pump Design
  The system design pressure is well above the maximum pressure that the pump is capable of delivering.