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FRIWAC-IM-DE-W-UK-10-2021-Rev.0 | Part no. 10084532

EN

ENGLISH

9  Maintenance

DANGER

Electricity!

Risk of death from electric shock!

 

h

Maintenance work on the domestic fresh water unit may only 
be carried out once the power supply has been disconnected.

!

!

 

WARNING

Hot water!

Severe scalding possible.

 

h

Do not put hands into hot water when draining the domestic 
fresh water unit. Allow the domestic fresh water unit to cool 
down before completing any maintenance, cleaning or repair 
work.

!

!

 

WARNING

Hot surfaces!

Severe scalding possible.

 

h

Do not hold pipework or components while the unit is in 
operation. Allow the domestic fresh water unit to cool down 
before completing any maintenance, cleaning or repair work. 
Wear heat-resistant safety gloves if it is necessary to work on 
hot components.

NOTICE

Maintenance of the domestic fresh water unit

must be carried out only by specialist personnel who have 
been duly trained and authorised by the manufacturer.

9.1  Annual maintenance schedule

1. General visual inspection

•   Check the unit for leaks and retighten connections with flat 

seals or replace the seals.

2. Functional check

•   Check the correct adjustment and operating and perfor-

mance parameters.

•   Check for noisy operation.
•   Check with the user in the event of anomalies.

3. Ball valves

•   Check for correct operation of shut-off valves and ball 

valves.

4. Pump

•  Be aware of noise build-up in the pump.

5. Post-maintenance checks

•   Check all loosened screw connections for a firm seating 

and retighten if necessary.

•   Remove all tools, materials and other equipment used from 

the work area.

•   Vent the system.

9.2  Replacing wear parts

Note that the domestic fresh water unit has parts which are 
subject to wear that naturally occurs as a result of normal use 
even when properly maintained and serviced. 
Specifically, these are mechanical parts and parts which are in 
contact with hot water and steam such as hoses, seals, valves, 
etc. 
Normal wear and tear is not a defect and is not covered under 
warranty or guarantee. Nevertheless, defects and malfunctions 
may only ever be remedied by trained specialist personnel. 
Contact your specialist dealer for more information.

9.3  Decommissioning

1.  Disconnect the power supply to the domestic fresh water 

unit and secure it against reconnection.

2.  Remove the front cover of the domestic water unit (Fig. 8-1 

on page 11).

3.  Close all the shut-off valves Fig. 8-4 on page 12).

After a prolonged shutdown

Relieve the pressure in the domestic fresh water unit (for example, 
by opening the vent screws, see Fig. 8-4 on page 12).

9.4  Recommissioning

Follow the instructions in Section 8.2 on page 12 for 
recommissioning.

Summary of Contents for FRIWAC Series

Page 1: ...FRIWAC Series Electronically controlled domestic fresh water unit Installation and operating manual translated from the original operating manual WattsWater eu ...

Page 2: ...ing the instantaneous water heater principle Domestic fresh water units of the FRIWAC Series are available in the following variants FRIWAC WT26 and FIRWAC WT40 Compact space saving design EPP insulation shell Electronic draw off temperature control All system connections with 1 union nut flat sealing Stainless steel pipework 1 4 Scope of delivery Domestic fresh water unit with EPP insulation shel...

Page 3: ...tronically controlled power settings The domestic fresh water unit is fully pre assembled and is designed for wall mounting The domestic fresh water unit is not intended for use by persons including children with reduced physical sensory or mental capabilities or lack of specialist knowledge or experience 2 4 Foreseeable misuse The following is regarded as foreseeable misuse operating the domestic...

Page 4: ...x depth with EPP shell 450 x 355x 232 mm Weight FRIWAC WT26 approx 10 kg FRIWAC WT40 approx 12 kg Connections to pipe network All connections 1 union nut flat sealing Tightening torques for screw fittings 1 55 Nm Materials Fittings CW617N Pipes Stainless steel Ø27 mm Plate heat exchanger Stainless steel copper brazed Plastics impact resistant and temperature resistant Flat seals AFM 34 2 O rings E...

Page 5: ...6 20 4 50 6 13 3 66 1 34 8 15 1 50 6 11 4 66 2 31 7 10 0 50 6 10 4 66 3 29 0 5 1 50 5 10 8 65 2 24 4 25 0 50 9 14 2 71 0 34 1 20 2 50 6 12 5 70 1 32 2 15 0 50 6 11 2 71 1 28 3 9 8 50 8 10 5 70 0 25 6 5 2 50 5 11 2 69 4 21 4 25 0 50 6 14 5 75 2 32 2 20 3 50 8 13 8 74 6 30 7 15 0 50 4 11 2 76 0 26 5 10 2 50 7 10 5 74 9 23 8 5 1 50 7 11 1 75 1 19 5 25 1 50 4 13 7 80 4 29 5 19 9 50 6 13 3 80 2 28 0 15...

Page 6: ... 3 65 9 30 3 14 8 50 4 11 8 66 3 27 1 10 2 50 4 11 3 65 9 24 3 5 1 50 3 11 7 64 5 21 7 35 3 47 0 14 7 70 8 29 5 29 7 50 3 14 5 70 4 31 6 25 1 50 6 14 2 70 3 30 4 19 8 50 7 13 9 70 3 28 1 14 8 50 5 13 1 70 1 25 5 10 2 50 5 12 8 69 8 23 4 5 1 50 4 13 1 69 4 20 6 35 1 50 6 14 2 75 0 31 5 30 5 50 3 13 4 74 8 29 8 25 2 50 4 12 6 75 9 27 4 19 9 50 4 11 6 75 5 25 3 14 8 50 6 10 9 75 2 23 6 10 3 49 8 9 9 ...

Page 7: ... 10 000 1 000 Pressure loss mbar Pressure loss mbar Volume flow rate l h Volume flow rate l h Fig 5 1 FRIWAC WT26 primary circuit pressure loss diagram Fig 5 1 FRIWAC WT26 secondary circuit pressure loss diagram Total pressure loss FRIWAC WT26 Primary circuit Total pressure loss FRIWAC WT26 Secondary circuit 1 10 100 1 000 10 100 1 000 10 000 ...

Page 8: ...r Volume flow rate l h Volume flow rate l h Fig 5 3 FRIWAC WT40 primary circuit pressure loss diagram Fig 5 4 FRIWAC WT40 secondary circuit pressure loss diagram Total pressure loss FRIWAC WT40 Primary circuit Total pressure loss FRIWAC WT40 Secondary circuit 1 10 100 1 000 10 100 1 000 10 000 5 2 FRIWAC WT40 pressure loss diagram ...

Page 9: ...9 FRIWAC IM DE W UK 10 2021 Rev 0 Part no 10084532 EN ENGLISH 6 Dimensions 420 85 60 85 353 72 102 165 165 375 355 103 150 G 1 G 1 Fig 6 1 FRIWAC domestic fresh water unit dimensions ...

Page 10: ...erature sensor 4 Supply sensor primary circuit beneath insulation 5 Circulation pump 6 Control systems 7 Vent valve A Heating supply primary circuit 1 union nut B Heating return primary circuit 1 union nut C Hot water outlet secondary circuit 1 union nut D Cold Hot water inlet secondary circuit 1 union nut B 1 2 5 D A C 4 6 7 Fig 7 1 FRIWAC domestic fresh water unit component overview 3 ...

Page 11: ... and water worksheet W551 are to be observed Ensure the various pump units domestic fresh water unit heating circuit unit are hydraulically separated We recommend flushing equipment is installed upstream and downstream of the plate heat exchanger in the primary and secondary circuits for descaling or cleaning if necessary When using galvanised pipework and fittings observe the installation sequenc...

Page 12: ...off valves items A and B 2 Open the vent valve item 2 by turning the vent key item 1 anticlockwise and keep it open until air is no longer escaping C B D A Primary circuit Secondary circuit 2 1 Fig 8 4 Domestic fresh water unit connection and venting procedure CAUTION Damaged circulation pump due to dry running The circulation pump is running before the domestic fresh water unit has been vented h ...

Page 13: ...peration Check with the user in the event of anomalies 3 Ball valves Check for correct operation of shut off valves and ball valves 4 Pump Be aware of noise build up in the pump 5 Post maintenance checks Check all loosened screw connections for a firm seating and retighten if necessary Remove all tools materials and other equipment used from the work area Vent the system 9 2 Replacing wear parts N...

Page 14: ...ed within one 1 year of delivery transfer of risk Excluded from the warranty are damages attributable to normal use of the product or wear and damages resulting from modifications or non authorised repairs on the products for which WATTS rejects all claims for compensation direct or indirect For more detailed information please refer to our website In all cases supply is subject to the General Ter...

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