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4. Commissioning and filling up

5. Draining & flushing out the system

4.1 Commissioning

4.1.1

 Check all connections for tightness.

4.1.2

 Open hot water tap furthest away from the PAW cylinder. Open the mains stop cock to fill the water heater. When 

water flows evenly from tap, allow to run for a few minutes to flush through any dirt, swarf or residue, then close the tap. 

Open successive hot taps to purge any remaining air.

4.1.3

 Check all water connections for leaks and rectify if necessary.

Manually operate Expansion relief valve 4 (see page 3) to ensure free water flow through discharge pipe by turning knob 

counter-clockwise. To close continue to turn counter-clockwise until the valve shuts.

Manually operate Temperature and Pressure Relief Valve 5 (see page 3) to ensure free water flow through discharge 

pipe.    

5.1 Draining

Switch off the electrical power (Important to avoid damage to element). Isolate heat pump/boiler from cylinder. Turn off 

the cold water supply valve. Open hot water tap. Open drain 12 (see page 3) at base of cylinder.

The unit will drain. Draining process may be speeded up by opening the temperature and pressure relief valve. An 

internal ø18 mm hose can be applied to lead the water to a gully, sink or similar.

5.2 System flushing

This will not be necessary under normal circumstances as the line strainer will prevent ingress of foreign materials, 

however if flushing is required, run at least 50 litres of water from the cylinder at the highest possible flow rate. Close 

the taps and follow draining procedure (above).

3.6 Primary Flow and Return and Motorised valve

3.6.1

 The heat pump/boiler primary flow and return connections should be made connections 1 & 2. The motorized 

valve can be connected to either the primary flow or return pipe. The primary flow and return fittings are 3/4’’ BSP 

female. The direction of primary flow in the coil is bottom to top. The maximum operating temperature of the primary 

flow would typically be 82°C.

3.6.2

 For electrical connection of the motorised valve and immersion heater, please read Electrical Installation 

Instructions. (Page 5).

6. Electrical installation 

- all wiring must conform to current IEE regulations

6.1 Immersion heater Thermostat

The immersion heater is designed as an auxiliary heater as an emergency back-up. Power to immersion heaters 

should not be switched on until the unit is filled with water. All units are fitted with one 1.5 kW @230V immersion heater 

which is located behind the electrical box. Alternative thermostats should not be used, regulations require immersion 

heaters on unvented cylinders to be connected with a thermal cut-out. Follow the wiring instructions below connect

-

ing the live, neutral and earth as indicated. The unit must be permanently connected to the electrical supply and each 

circuit must be protected by a suitable fuse and double pole isolating switch, compliancy to IEE regulations.

The immersion heater has a working thermostat adjustable between 18°C - 70°C (+/- 5°C). A safety cut-out is also 

incorporated within the thermostat and will operate at 87°C (± 5°C). Should this happen, check reasons for thermal 

cut-out button being released and when satisfied press the reset button.

OSO Hotwater AS can not be held

responsible if alternative wiring plans are used.

Important: Before resetting the safety cut-out or

altering the thermostat setting isolate electrical 

supply to the unit before removal of the lid.

Ensure the lid to the electrical box is replaced.

Summary of Contents for PAW-TD20C1E5-UK

Page 1: ...e formation in hot water cylinders in accordance with Building Regulation Part L Domestic Heating Compliance Guide This cylinder must be installed by a competent person and be installed in compliance with the Installation and Maintenance Instructions all current legislation codes of practice and regulations governing the installation of unvented hot water cylin ders in force at the date of install...

Page 2: ...ts factory fitted Immersion heater with thermostat and thermal cut out Additional cylinder thermostats with thermal cut out for indirect heat source Temperature and pressure relief valve 1 5 Documentation supplied Installation manual log book 1 6 Supply requirements An uninterrupted 22mm cold water mains supply is recommended however if only a 15mm supply is available this may be used provided the...

Page 3: ...plied 14 Motorised Valve Not factory fitted 15 Expansion Vessel 16 Hot Water Circulation 3 4 BSP 1 6 5 4 3 2 7 16 8 15 13 9 11 10 10 12 A A Y 1 2 3 4 6 66 3 10 Return 3 4 BSP female Flow 3 4 BSP female CW inlet 3 4 BSP female 5 0 Power supply Sensor cable inlet 87 P T valve 1 2 HW outlet 3 4 BSP female Immersion Heater w Thermostat Safety Cut out Housing for Sensor probe Power supply and Sensor ca...

Page 4: ...on relief valve 4 and also from the T P valve 5 and join together in a Tee as shown on page 3 3 1 8 Fit the tundish 6 to the bottom connection of this tee 3 1 9 Connect the cold supply to the multibloc 3 3 1 10 Fit the expansion vessel to the wall close to the water heater using the enclosed mounting bracket Connect the expansion vessel to the multibloc as shown on page 3 3 2 Hot water supply Conn...

Page 5: ...w and return connections should be made connections 1 2 The motorized valve can be connected to either the primary flow or return pipe The primary flow and return fittings are 3 4 BSP female The direction of primary flow in the coil is bottom to top The maximum operating temperature of the primary flow would typically be 82 C 3 6 2 For electrical connection of the motorised valve and immersion hea...

Page 6: ...rought into operation the motorised valve will operate and close down the pri mary flow to the cylinder To reset the safety cut out and the motorised valve the reset button must be pressed in Wiring Diagram Also see S plan and Y plan wir ing page 7 and 8 This product requires a fused permanent Live and Neutral supply 6 4 1 Holiday Mode This is the black button located under the display Press and h...

Page 7: ... as high limit stat only coil the grey temperature probe wire inside additional cylinder thermostat box and insert black probe into thermostat pocket of cylinder then turn dial on front to number 5 Channel running from base of cylinder Pump flow 2 port valve supplied Zone valve not supplied Automatic bypass Radiators UFH HP Boiler Piping Diagram Zone Valve DHW supplied 1 2 2 3 1 T6360B 3 5 7 3 G Y...

Page 8: ...t stat only coil the grey temperature probe wire inside additional cylinder thermostat box and insert black probe into thermostat pocket of cylinder then turn dial on front to number 5 Channel running from base of cylinder 1 2 E 2 3 1 T6360B 3 3 1 4 G O B1 Br G Y N L E N L E N L ST6400 Heat pump Pump 1 2 3 3 2 3 2 2 2 3 1 V4043H Room thermostat Zone Valve DHW supplied Isolated Mains Supply From Fu...

Page 9: ... slow discharge from the tundish occurs when water is being heated In this situation maintenance must be car ried out by competent person and the precharge pressure must be restored to the original value An annual visual inspection is recommended Important To check the precharge the expansion vessel must be completely empty of water If the precharge pressure is different from the value shown on th...

Page 10: ...itch on 2 Immersion heater thermal cut out has operated 2 Check and reset button see thermostat diagram page 8 and safety cut out on page 5 of installation manual 3 Programmer set to central heating or not switched on 3 Check and set to hot water 4 Heat Pump Boiler not working 4 Check Heat Pump Boiler operation If fault suspected consult installer or Heat Pump Boiler manufacturer 5 Cylinder therma...

Page 11: ...5 Primary Heating power heating coil kW 35 32 39 4 Primary Heating coil pressure drop mbar 120 120 170 Heat up time immersion heater min 255 464 384 ErP class A A A Pressure information Design pressure of cylinder rated pressure MPa Bar 1 10 1 10 1 10 Design pressure of heating coil MPa Bar 1 10 1 10 1 10 Operating pressure of cylinder MPa Bar 0 3 3 0 3 3 0 3 3 Operating pressure of heating coil M...

Page 12: ...uropean Drinking Water Directive EN 98 83 EC or latest version The water should not be aggressive i e the water chemistry shall comply with the following Chloride 250 mg L Total Dissolved Solids TDS 500 mg L Saturation Index LSI 80 C 0 8 pH level 9 5 6 0 The immersion heater is not exposed to hardness levels exceeding 20 dH Any disinfection has been carried out without affecting the Product in any...

Page 13: ...ificate that can be accepted as evidence of compliance with the appropriate Building Regulations 3 Failure to install and commission this appliance to the manufacturer s instructions may invalidate the guarantee The above does not affect your statutory rights INSTALLER COMMISSIONING ENGINEER DETAILS INSTALLER DETAILS COMPANY NAME DATE ADDRESS INSTALLER NAME TEL No REGISTERED OPERATIVE ID CARD No I...

Page 14: ...ISCHARGE TESTED IS PRIMARY ENERGY SOURCE CUT OUT FITTED NORMALLY 2 PORT VALVE WHAT IS THE PRESSURE REDUCING VALVE SETTING IF FITTED WHERE IS OPERATING PRESSURE REDUCING VALVE SITUATED NO YES NO bar HAS THE EXPANSION VESSEL OR INTERNAL AIR SPACE BEEN CHECKED YES NO WHAT IS THE HOT WATER TEMPERATURE AT THE NEAREST OUTLET C bar ALL PRODUCTS YES DOES THE HOT WATER SYSTEM COMPLY WITH THE APPROPRIATE BU...

Page 15: ...MENTS SIGNATURE DATE ENGINEER NAME SERVICE 5 COMPANY NAME TEL No COMMENTS SIGNATURE DATE ENGINEER NAME SERVICE 7 COMPANY NAME TEL No COMMENTS SIGNATURE DATE ENGINEER NAME SERVICE 9 COMPANY NAME TEL No COMMENTS SIGNATURE DATE ENGINEER NAME SERVICE 2 COMPANY NAME TEL No COMMENTS SIGNATURE DATE ENGINEER NAME SERVICE 4 COMPANY NAME TEL No COMMENTS SIGNATURE DATE ENGINEER NAME SERVICE 6 COMPANY NAME TE...

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