Thermolec Application &Technical Notes - Manual (Page 47)

THERMO-V S
PECIFICATION
Supply where indicated in these specifications, or where shown on drawings, CSA (NRTL/C) approved THERMO-V type
heaters specially designed for VAV boxes and manufactured by THERMOLEC.
☛ 1- AIR FLOW:
• The proportional electronic air flow sensor shall be totally independent of the duct static pressure and shall adjust
the heater capacity according to the available air flow:
The heaters shall deliver maximum heating when needed with normal minimum air flow, reduce heating with lower
than minimum air flow and stop heating with no air flow.
☛ 2- CONTROL AND INPUT SIGNAL:
• Heaters shall be equipped with a proportional controller to modulate the heater load according to the temperature
control signal.
The electronic controller shall be compatible with the following input signals:
- Variable voltage signal 0-10 VDC
- Pulse with modulation AC or DC
☛ 3- CONSTRUCTION:
• Frame shall be corrosion-resistant and made of galvanized steel of suitable gauge as required by CSA.
• Coils shall be made of high grade Nickel-Chrome alloy and shall be insulated by floating ceramic bushings from the
galvanized steel frame.
• Coil terminal pins shall be in stainless steel, mechanically secured and insulated from the frame by means of non-
rotating ceramic bushing.
• Coil support bushing shall be made of ceramic and shall be held in the frame by a lock which will keep it floating and
stress-free.
• Heaters shall be CSA approved for zero clearance in horizontal ducts.
☛ 4- SAFETY AND BUILT-IN CONTROLS:
• Heaters shall be equipped with fail-safe automatic reset disc thermal cut-out.
• In addition, heaters of 30KW and less, rated for voltages below 300 volts shall be equipped with a fail-safe disc type
manual reset thermal cut-out as required by CSA.
• Cut-outs shall de-energize the heater in case of accidental over-heating.
• For maintenance and safety purposes, the heaters shall be equipped with a built-in disconnect to switch the power
off at the heater location and protective screens on both sides.
• Load fuses shall be supplied as recommended by NEC (National Electrical Code).
• All duct heaters shall be complete with the following built-in controls : magnetic contactors as required, control
transformer, proportional electronic controller and air flow sensor as standard components.
☛ 5- SIZE & CAPACITY:
• Heater size, volts, phase, kilowatts shall be as per the following schedule.
☛ 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 shipment, heaters shall withstand tests as required by CSA.
☛ 7- APPROVALS:
• Heaters data sheets, wiring diagrams and mechanical drawings shall be submitted to the consulting engineer for
approval before manufacturing.
THERMO-V SPECIFICATION
THERMOLEC