Electrical Connection - VTS Medical Systems VVS005s Operation And Maintenance Manual

5

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.
NOTICE! 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.
Overheating thermostat
Functions and application
Protection module of the electric heater protecting it against overheating
Construction
Metal casing
Two screw terminals
bimetallic element with a function of a normally closed contact
Operation parameters
activation temperature: 65±3 o C
o
hysteresis: 17±3 C
parameters of bimetallic element voltage: 30VDC permissible load.
Differential pressure control
Functions and application
Fan's pile-up control
Construction
Membrane coupled with mechanical module. If the acceptable pressures difference is exceeded, the membrane undergoes deformation and
switches off
casing: plastic
Operation parameters
measurement: 20 – 300 Pa:
rated operational voltage 30VDC
output signal: voltage-free (switching contact)
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number of cycles: <10 cycles
operation conditions: -30 – +85°C
protection class: IP44
Recommended pressure control operating position: horizontal. In case of vertical alignment, the set point value is 11Pa higher than the real
one.
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VTS reserves the right to implement changes without prior notice
OMM_HE_SEC_ver 1.1