Thermolec Application &Technical Notes - Manual (Page 40)

OPEN COIL HEATER
Long Form (continued)
☛ 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, power supply on, overheating, no air flow, heating on
Note: it is also possible to order a separate CEMA-1 remote control panels (option M6)* with the above options.
* Remote mounting control panel must include HRC Form 1 load fuses in order to provide over-current protection for each
duct heater power circuit.
☛ 8- HEATERS FOR VAV SYSTEMS:
• Duct heaters for VAV systems will be electronic modulating type “THERMO-V”, equipped with a
proportional controller to modulate the total heater load according to the temperature control signal and a
proportional electronic air flow sensor (non pressure dependent type) to modulate the heater capacity
according to the available air flow:
Maximum heating with normal air flow
Reduced heating with low air flow
No heating with no air flow
Please refer to the Thermo-V flyer and specification at the end of this section.
☛ 9- 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).
☛ 10- APPROVALS:
• Heaters data sheets, wiring diagrams and mechanical drawings shall be submitted to the consulting engineer for
approval before manufacturing.
THERMOLEC