Thermolec Application &Technical Notes Instrukcja Użytkownika Pobierz pdf (Strona 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

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Thermolec Application &Technical Notes Instrukcja Użytkownika Strona 40