Functional description

TACOCONTROL Z1 S

4

Functional description

4.1 Operating modes

Automatic mode (Auto)

Manual mode (Man)

The heat interface unit operates using the standard controller func-

tion in automatic mode. Measurements can be viewed, and setpoints

can be entered.

The signals for the heat interface unit are determined manually in

manual mode. The setpoints for the parameter settings are ignored

when manual mode is active. A switchover to automatic mode occurs

after a predefined period of time.

The following components are controlled in manual mode:

n Valve for domestic hot water

n Valve for heating supply

n Heating circulation pump

n Valve for keep warm function

Legionellae are killed off by thermal disinfection in this operating

mode. The lines are flushed at a water temperature of at least 55 °C

over a preset period. Once this preset period has elapsed, a switch-

over back to automatic mode occurs.

Thermal disinfection (Legio)

WARNING!

Proliferation of legionellae due to stagnant water!

If the unit is not used for an extended period, there

is a risk of the proliferation of legionellae due to

stagnant water.

– Upon restarting, set the operating mode to

“Thermal disinfection” (Legio) to flush the

drinking water lines with hot water ( Ä Chapter

6.3 ‘Setting the operating mode’ on page 25).

Legionellae are bacteria of which one species is

harmful to humans. Legionellae can easily proliferate

in pipes with warm, stagnant water. Flushing the

pipes at a water temperature of at least 55 °C kills off

the legionellae.

Test procedure (Test)

All components of the system are activated to test their function for

approx. 1 min. in an automated process in this operating mode. Once

this time has elapsed, a switchover back to automatic mode occurs.

05/2024 Item no. 215251 EA no. EA-1291

Operating instructions

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