Thermolec Application &Technical Notes - Manual (Page 44)

TUBULAR HEATER SPECIFICATION
Long Form (continued)
☛ 6- INTERNAL WIRING:
• All internal wiring shall terminate on clearly identified terminal blocks.
• A wiring diagram shall be installed on the control box cover.
• Prior to shipping, heaters shall withstand tests as required by CSA.
☛ 7- STANDARD BUILT-IN CONTROLS:
All duct heaters shall be complete with the following built-in controls:
• High limit cut-outs, magnetic contactors as required, control transformer and air flow sensor as standard
components.
Additional options can be chosen from the following list:
• Mercury contactors
• Unfused disconnect switch
• SCR proportional controller
• HRC Form 1 load fuses
• Hybrid controller with SCR and binary steps
• Pressure Electric switches
• Pneumatically controlled SCR
• Pilot lights to indicate staging, control voltage on, power supply on, overheating, no air flow, heating on
☛ 8- SPECIAL CONSTRUCTION:
• Heaters could be equipped with a bottom terminal box, weatherproof shroud or any other feature selected from the
option list (see section 2).
☛ 9- APPROVALS:
• Heaters data sheets, wiring diagrams and mechanical drawings shall be submitted to the consulting engineer for
approval before manufacturing.
THERMOLEC