Faults

TacoTherm Dual ZEPTO

2.

3.

Release the bolted connection for the pump using an adjust-

able spanner, and lift the pump off.

4.

Collect the remaining water using a cloth.

5.

Install the new pump.

6.

Ensure that new O-ring seals are available.

7.

Tighten the bolted connections using an adjustable spanner.

8.

Restart the heat interface unit (

Ä Chapter 7 ‘Preliminary com-

missioning’ on page 42 and

Ä Chapter 8 ‘Final commissioning’

on page 45).

9.

Set the pump in accordance with the controller instructions for

the unit (

Ä Chapter 1.2 ‘Other applicable documents’

on page 8).

WARNING!

Risk of burns due to hot pipes!

If the pipe section is one through which hot water flows, wait

until the pipe section has cooled down.

11.5

Replacing the backflow preventer

Personnel:

Protective equipment:

Tool:

Material:

n Heating and sanitary technician

n Protective gloves

n Adjustable spanner

n Spare parts

n Cloth

1.

2.

3.

Close the main shut off valve (Fig. 42) for the supply line to the

backflow preventer to ensure no more water can flow through

the backflow preventer.

Observe the flow chart (

Ä Chapter 3.1 ‘Circuits

and connection points in the heat interface

unit’ on page 23).

Fig. 42: Main shut off valve closed

WARNING!

Risk of burns due to hot pipes!

If the pipe section is one through which hot water flows, wait

until the pipe section has cooled down.

Release the bolted connection for the backflow preventer using

an adjustable spanner, and place the backflow preventer to

one side.

V03 06/2025 Item no. 215250 EA no. 1292

Operating instructions

55