Summary of Contents for VTS Medical Systems VVS005s
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Electric Heaters - Power Slices Operation and Maintenance manual VTS reserves the right to implement changes without prior notice OMM_HE_SEC_ver 1.1...
Table of Contents Installation options ....................................1 Electric heater in the non-insulated duct ........................... 1 Power slices in original AHU casing ............................1 Range of the application ..................................1 VVS Standard & AVS ................................... 1 VVSc compact floor mounted air handling unit ......................... 1 VVSs suspended compact air handling unit ..........................
Installation options For the following AHU ranges: VVS Standard, AVS (with all subranges) and VVSc floor mounted units, the electric heater made of power slices can be applied in two different ways: Electric heater in the non-insulated duct As per default, the electric heaters made of power slices will be available as shown on the rights. All power slices will be simply installed in the short duct with the power junction box on the side.
Electrical connection Connecting power supply should be carried out with a separate switchgear, not supplied with the VTS package. 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.
Wiring cable types details Power cord for electric heaters (voltage 3 ~ 400VAC) Multi-core, copper conductor - twisted cable Operating voltage U0 / U 450 / 750V Working temperature -30- + 60C Power cable for the control system (voltage 1 ~ 230VAC) Multi-core, copper conductor - twisted cable Working voltage U0 / U 300 / 500V Working temperature -30- + 60C...
Wiring schematics High power and low power box contains the same elements – only difference is in the connection of the heaters. 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.
Maintenance Procedure Electric heater consists of bare heating coils. During AHU operation, when the heater does not work, dust may settle onto the heating coils. Once the heater is turned on again, strong contamination may cause smell of burning dust or even preliminary fire danger may appear. Check regularly (every year) and especially before starting a heating period, any electric connections, condition of heating elements and their contamination level.
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