VOKERA AquaFlow User Manual

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AquaFlow

Single coil water cyliner

Installation
& Servicing
Instructions

THESE INSTRUCTIONS
TO BE RETAINED
BY USER

Vokèra is a licensed member of the Benchmark scheme
which aims to improve the standards of installation and
commissioning of domestic hot water systems in the UK.

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PLEASE LEAVE THIS MANUAL WITH THE UNIT AFTER INSTALLATION

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Aquaflow

Single coil water cylinder

INSTALLATION MANUAL

This manual gives detailed advice for installation and should be read carefully
prior to fitting any unvented unit. This Vokera Aquaflow cylinder must be installed
by a competent person and be installed in compliance with the Vokera Aquaflow
Installation and Maintenance Instructions, all current legislation, codes of practice
and regulations governing the installation of unvented hot water cylinders in force
at the date of installation.

Components supplied with the unit for site fitting

(See also page 2 for component list)

* Multibloc valve, includes pressure reducing valve, line strainer, balanced cold water take off, (for

shower or bidet only) check and expansion valve.
* Tundish.
* 1/2"F x 15 x 15 tee piece.
* Flexible hose.
* 3/4" x 22 mm Elbow / Drain Cock
* Commissioning valve, 1/2" BSP male.

• Motorized valve.

• Expansion vessel

Components factory fitted

* Immersion heater(s).
* Thermostats / thermal cut-out.
* Temperature and press

ure relief valve.

Manual Handling Operations Regulations 1992 defines manual
handling as: "any transporting or supporting of a load (including the
lifting, putting down, pushing, pulling, carrying or moving thereof) by
hand or bodily force" The Regulations set no specific requirements
such as weight limits. However common sense still has to be used
based on an ergonomic approach for each individual

DIMENSION AND WEIGHTS TABLE 1

PRODUCT REF. 120 150 200 250
HEIGHT 720 900 1150 1600

DIAMETER 580 580 580 580
WEIGHT EMPTY 34 40 48 64
MAX WEIGHT FULL 132 163 215 303

Health and Safety

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Installation details

The Vokera unvented unit is designed for use with supply pressure up to 16 bar. For pressures
over 16 bar an additional pressure reducing valve must be fitted in the supply pipe to the unit. Wall
mounting brackets are available for Vokera Aquaflow unvented units 120-200 litres capacity.

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General Layout Fig: 1

INDIRECT

2

RESET

1

1

2

3

4

1

4

2

RESET

5

1
1

1
1

9

3
4

16

1
8

1

2

4

15

1

222

1

33113

RESET

RESET

4

4

2

2

1

2

10

5

6

17

7

7a
8

13

KEY Part No KEY Part No

1 Flow BSPF * 10 Flexible Hose 202108
2 Return BSPF * 11 Secondary Return ½”BSPF

3 Pressure Reducing Valve

510503 12 Commisioning Valve / Fitting

Includes Item 4
4 Check and Expansion Valve 510505 13 Elbow / Drain Cock 250445
5 Temperature and Pressure

550803 14 Cable Entry

Relief Valve
6 Tundish 219002 15 Electrical Box
7 Immersion Heater 71255 16 Tee Piece 250006

7A Thermostat Immersion Heater

Thermostat Cylinder

80400
80511

8 Cold Feed Tube

(Not Supplied See Table 2)
9 Hot Water Outlet 22mm

Fit ½"Fx½"Mx15mm Tee piece

supplied)

(½" MI Drain Cock)

17 Discharge Pipe (Not supplied)
18 Motorised Valve Not Factory Fitted)

9

(Not

250440

92000

Series Length of tube (ø22) mm

120 480 mm
150 585 mm
200 760 mm

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TABLE 2

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COLD WATER SUPPLY

1. To obtain the best performance from your Aquaflow unvented system it is advisable to feed

the unit with an uninterrupted supply.

2. Locate the water heater in a suitable posit
supply, discharge fittings and pipework. Also take into account access to the immersion
heaters and the commissioning valve.

3. Fit the combined male elbow / drain cock to cold
compression fitting is vertical.

4. Fit the commission

5. Fit the female outlet of the tee piece to the temperature and pressure relief valve (5) with

horizontal connection facing right at approx. 45°.

6. Fit the tundish (6) to the tee piece using a short length of 15 mm copper tube.

7. Fit the length of copper tube 22mm specified

8. Fit the pressure reducing valve (3) to the top of the copper tube (see

black knob is facing right.

9. Connect
of the tee piece (see 5 above). Discard compression nut & ring.

10. If
type only, ascending spray

cap from the pressure reducing valve (3) and connect to the shower or bidet cold supply.

(Major shower manufacturers advise fitting a mini expansion vessel in the balanced cold supply
pipework to accomodate thermal expansion and prevent tightening of shower controls)

the balanced cold connection to feed bath taps can reduce the flow available to the
unvented cylinder.

11. Before connecting the cold supply, flush the cold supply pipework of all flux and debris.

12. Connect the cold supply to the pressure reduction valve (Multibloc) (3).

the flexible hose to the 1/2" outlet of the expan

a balanced mains pressure cold water supply is required to a shower or bidet (over rim

ing valve (12) to the commissioning fitting .

type requires type AA,AB or AD air gap), remove the blanking

ion to facilitate the installation of

supply point (13), so that the

in Table 2 to the cold feed elbow (see 3 above).

sion valve (4) and the horizontal outlet

the cold water

7 above), so

the

that the

Using

Hot water supply

13. Connect the hot water supply pipe to the outlet (9). Ensure connection is water tight.

Secondary return

14. A secondary return facility is provided on all units. Fit a ½” F x ½” M x 15mm tee piece

between the commissioning valve (12) and the commissioning fitting. See also figure 4 on
page 16.

Discharge pipe

15. Connect the discharge pipe from the tundish (6)This must have a continuous fall and be
fitted in accordance with The Building Regulations (see pages 5 and 12).

Primary flow & return and motorised valve

16. The boiler primary flow and return connections should be made to the unit. The motorised

valve must be fitted into the primary flow. The primary flow and return fittings are 3/4" BSP
female.

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

Installation Instructions. (Pages 7 – 11)

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Expansion Vessel

18. Connect the expansion vessel (supplied) to the cylinder as shown in the diagram below. The

vessel should be charged/pressurised to the same pressure as the PRV (Pressure Reducing
Valve).

COMMISSIONING

Filling up

1. Close all hot water taps.

2. Open the commissioning valve (12).

3. Open the cold water supply valve.

4. When water flows from the commissioning valve (12), close the va

5. Allow system to stabilize for five mi

6. Open each hot water tap in turn to expel air from the system pipe work.

7. Check for

8. Manually operate Temperature and Pressure Relief Valve (5) to ensure free water flow through

discharge pipe.(Turn knob to left.)

leaks.

nutes.

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lve.

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Draining

Switch off the electrical power off (Important to avoid damage to element). Isolate boiler from
Aquaflow unit. Turn off the cold water supply valve. Open hot water tap. Open drain (13). The unit
will drain.

SAFETY AND MAINTAINANCE

Safety Cut-out

1. The safety cut-out operates if:

a. Wiring is incorrect.
b. The immersion heater thermostat or cylinder thermostat fails.
c. Thermostat is set too high.

2. Remember

electrical supply to the unit prior to removal of the electrical box lid.

3. Reduce thermostat setting and press the reset button.

the lid to the electrical box is replaced correctly and the retaining screw is fitted.

4. If still out of operation,

before resetting the safety cut-out or altering the thermostat setting, iso

After adjustments are completed,

contact installer.

late

ensure

Cold or tepid water discharge from tundish

1. Turn off the electrical supply to the immersion heaters.

2. Turn off cold water supply valve.

3. Open a hot tap.

4. Drain water f

5. Turn the knob on the Temperature and P

position until water flow stops from the commissioning va

6. Close commissioning

7. Close all hot taps.

8. Open cold water supply valve.

9. Turn on electrical supply to the immersion heaters.

rom commissioning valve (12) until water flow stops.

ressure Relief Valve (5) to the left and hold in this

lve.

valve.

Hot water discharge from tundish

This indicates a malfunction of a thermal cut-out, operating thermostat or the combined temperature
and pressure relief valve. Turn off the electrical supply to the immersion heater and also isolate an
indirect unit from the boiler. Contact the installer or competent engineer.

INSTALLATION AND SERVICING INSTRUCTIONS

Cold water inlet control (Multibloc) See Page 2 Items 3 - 4

This combination consists of a pressure reducing valve with integral strainer, check valve and
expansion valve with stainless steel seat. The pressure settings are set and locked in the factory
and are shown on the top of each valve. For optimum performance the following installation
instructions should be complied with.

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