Xvi.7.C. Manual Reset; Xvi.8. Tha Frost Protection Thermostat (Hot Water Coil); Xvi.8.A. Location; Xvi.8.B. Nominal Trigger Threshold Setting - Caladair EVERSKY 500 Installation And Commissioning Manual

XVI.7.c.
When the thermostat has triggered due to an overheating detection, it is necessary to manually reset it by pressing the white button
after removing the protective cap. As long as the reset has not been carried out, the fan unit will not be able to restart and the alarm
(23) "electric heating coil is overheated" will always be present.
Before manually resetting the THS thermostat or the THSD thermostat, it is necessary to understand and correct the cause of the
malfunction.
XVI.8. THA frost protection thermostat (hot water coil)
The THA frost protection thermostat protects the hot water coil from freezing in case the hot water production system (device
external to the ventilation unit) is not functional and the ventilation unit is operating in full fresh air mode during periods of low
outside temperature (below +5°C).
When the THA thermostat triggers (the contact opens), the fan unit stops and the hot water pump output DO3 is activated to force
the heating of the coil. When the temperature of the bulb rises above +5°C, the contact closes and the unit restarts normally.
XVI.8.a.
Location of the THA frost protection thermostat and its bulb (central view from below)
The THA frost protection thermostat is located in the control compartment near the main switch. Its bulb is positioned on the hot
water coil.

XVI.8.b. Nominal trigger threshold setting

The THA thermostat is set to +5°C out of the factory.
XVI.8.c.
The THA antifreeze thermostat is of type NC (Normally Closed). The contact opens when the temperature of the bulb drops below
+5°C. The electrical connection is made between the terminals (C) and (2) according to the electrical diagram see XVII GENERAL
WIRING DIAGRAM.
MS-CDF-019 – Manufacturing Nr: 220001→
Manual reset
Location
Electrical connexion
EVERSKY
Version B Update: 2022/06/14
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