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The ZR 011 houses two separate thermostats, allowing the independent control of heating and cooling or other
equipment.
Thermostat NC (normally closed): Thermostat opens at temperature rise – for regulating heaters or for switching
signal devices. Comes with red temperature dial.
Thermostat NO (normally open):  Thermostat closes at temperature rise – for regulating filter fans and heat
exchangers or for switching signal devices. Comes with blue temperature dial.