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

EN

ENGLISH

8  Installation and commissioning

DANGER

Electricity!

Risk of death from electric shock!

 

h

Work on live parts must be carried out only by trained 
electricians.

 

h

Disconnect the power supply to the unit before carrying out any 
installation, maintenance, cleaning or repair work and secure it 
against reconnection.

!

!

 

WARNING

Hot water!

Severe scalding possible at point of use.

 

h

Install a thermostatic mixing valve at the point of use.

NOTICE

The domestic fresh water unit may only be

installed and commissioned by specialist personnel who have 
been duly trained and authorised by the manufacturer.

!

!

 

CAUTION

When carrying out repairs and replacing

parts, the prescribed mounting positions and flow directions 
for the individual components to be replaced must be 
observed.

!

!

 

CAUTION

Material damage due to water hammer.

Water hammer may occur if the shut-off valves are opened 
and closed quickly.

 

h

Always open and close the shut-off valves slowly and in a 
controlled way.

Requirements

•  A safety valve to DIN 1988 must be installed at the cold water 

input. This may not have a shut-off function.

•  Install a filter on the cold water input.

•  When operating a circulating system, the applicable technical 

regulations and hygiene provisions to DVGW (Deutscher 
Verein des Gas- und Wasserfaches - German association for 
gas 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 sequence to avoid electrochemical corrosion.

•  The fittings are preassembled at the factory; however, the 

tightness of the seal is to be checked before commissioning 
(pressure test).

NOTICE

Install the domestic fresh water unit

with the controller at eye level whenever possible.

8.1  Installation

Tightening torques for screw fittings 1" 55 Nm

!

!

 

CAUTION

Danger of material damage.

The domestic fresh water unit is not protected against water 
splashes or drops.

 

h

Always install the domestic fresh water unit in a dry environment.

!

!

CAUTION

Poor water quality!

Hard water causes limescale build-up in the domestic fresh 
water unit and reduces the water quality.

 

h

We recommend the use of a water softener for water hardnesses 
> 8.5° dH and water temperatures < 60 °C.

 

h

A water softener is required for water hardnesses > 14° dH and 
water temperatures > 60 °C.

1.  Remove the domestic fresh water unit front cover.

Fig. 8-1: Removing the front cover

•  Observe Fig. 8-2 for steps 2 and 3.
2.  Mark the drilling points for mounting the domestic fresh 

water unit.

3.  Drill holes for the relevant size screws and wall plugs.

420

85

60

85

353

72

102

165

165

375

355

103

150

G 1"

G 1"

Fig. 8-2: FRIWAC installation diagram

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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