VTS Ventus VVS180 [29/65] Electric heater

VTS reserves the right to implement changes without prior notice

Ventus Air Handling Units

Fig.17.b. Electric connection diagram for circulating humidifier

Electrical connection should be done in accordance to the schemes shown in the fig 17.a. and 17.b.

4.11.3 Electric Heater

Electric heater supply wiring should be let through the fixed panel, at the AHU's back. If the wiring is

led through the inspection panel, on the front side, then it should be arranged so as to enable

opening the section for maintenance and service operations.

Connecting power supply to the heater with control module should be done directly in the heater

section, according to the guidelines of the module operation and maintenance manual.

Connection of the heater should be done in a way to prevent from possibility of switching on the

heater when the fan is not switched on. What is more, if the fan stops, the heater's power supply

must be turned off as well.

The thermostat must be absolutely installed in the heater control system.

Thermostat functionality is based on the bimetal element properties, resulting in opening the heater

control circuit contacts at air temperature near the thermostat up to 65ºC. After emergency turn off,

the heater turns on automatically once the air temperature goes down by 20ºC. After intended or

emergency (caused by overheating) turning off the power supply, the supply-air fan has to operate

for some time (0.5-5 min), so as the heater's coils reached their normal temperature.

All electric connections and configuration of the heater's control should be done in accordance with

the guidelines of the OMM HE SEC.