Honeywell EN2H-0221GE51 R0808 service manual Sdc / Dhc

Hydraulic Components SDC / DHC

Hot-water circuit - night- time

Legionella protection

Temperature measurement

NOTE

Hot-water economy temperature is the setpoint for the hot-water tank between the active operating mode times in automatic mode.

If a hot-water thermostat is used to determine the water heater temperature, the parameter for the setting of the economy temperature is skipped.

In order to kill Legionella germs in the tank, a Legionella protection function can be activated. Activation is carried out in the "Hot Water" menu, parameter 2.

To ensure full destruction of germs, the set value of the Legionella protection temperature must be at least 65°C.

The setting is carried out with two parameters. The weekday for Legionella protection can be selected by the user with a freely accessible parameter. With parameters 03 and 04, the time and temperature can be set by the heating technician.

Type of temperature measurement

This function determines the type of temperature measurement in the hot-water tank.

In general, an electronic temperature sensor (immersion sensor in hot-water tank) is used. The temperature is measured via the change in resistance of this sensor here.

Alternatively, hot water provision can also be controlled by a mechanical temperature controller (thermostat switching contact). A hot-water thermostat is connected to tank sensor input and set to the required setpoint hot-water temperature. When the thermostat requires energy via the tank sensor input (contact closed), the tank is loaded with hot water at the set hot water maximum temperature until the contact opens again.

With hot water control through a thermostat, the current hot water temperature cannot be measured and registered and will therefore not be displayed as part of the system information. Also, the hot water nominal temperatures cannot be set.

Maximum hot water This function limits the temperature in the water heater upward temperature based on the set value. The desired water heater daytime

temperature to be set on the user level is limited by this set value.

188 EN2H-0221GE51 R0808