Potterton Mersey Super Guide rapide

INSTALLATION AND SERVICE INSTRUCTIONS

Mersey Super

Gas Fired Water Heater

G.C. NO.52476 38

NON SPOUTED MULTIPOINT MODEL

FOR USE WITH NATURAL GAS

THE GAS SAFETY (INSTALLATION AND USE) REGULATIONS 1984.

"In your own interest, and that of safety, it is law that all gas appliances are installed by

competent persons, in accordance with the above regulations. Failure to install appliances

correctly could lead to prosecution."

Installation must be in accordance with the Building Regulations, Byelaws of the Water

Undertaking, and I.E.E. Wiring Regulations. It should be in accordance also with any

relevant requirements of the Local Gas Region and Local Authority and the relevant

recommendations of the following British Standard Codes of practice: BS 6891, BS

5440:1:2 and BS 5546.

LEAVE

THESE

INSTRUCTIONS

WITH

THE

USER

FOR

USE

FUTURE

CALLS

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IMPORTANT

PLEASE READ THIS BOOK

BEFORE INSTALLING,

OPERATING OR SERVICING THIS APPLIANCE.

Page 1

1. INTRODUCTION - Page 2

The Main Mersey Super is a room sealed instantaneous water heater designed to supply

hot water to several outlets which may be situated in different rooms, but not necessarily at

the same time.

The pilot is lit by a piezo spark igniter: no batteries or electricity are required. The main

burners will automatically light when a domestic hot water tap is turned on and go out when

the tap is turned off.

This appliance is not suitable for use with a swivel spout.

ENERGY CUT-OFF DEVICE

This appliance contains an Energy Cut-Off Device that will shut down the gas supply to the

appliance if the water within the heat exchanger exceeds the anticipated temperature limit

after the hot water tap has been turned off - See Page 21.

VENTILATION

Being a room sealed appliance, the Mersey Super does not require an air vent in the room

or space in which it is installed.

Where this appliance is installed in a compartment, air vents to the compartment at both

high and low levels, should be provided for cooling.

Further guidance is given in BS 5440 Pt.2.

Position of Air Vent

High Low

In compartment which is ventilated to room 274 cm² 274 cm²

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GENERAL

IMPORTANT: The area of wall covered by the appliance must be flat.

The clearances required around the Flue Terminal are shown on the Flue Template

supplied with the Terminal Pack.

The appliance must be fitted on an external wall to allow the Flue Terminal to pass directly

through the wall to the outside air.

If the appliance is to be installed into a "SEDUCT" the minimum duct required is 228mm

(9in.) deep, 349mm (1 5½in.) wide.

This appliance may take the place of an existing appliance and will mount onto the original

flue terminal of any of the following: AVON, BRISTOL, MEDINA, MEDINA D/L, MEDWAY,

MERSEY, SEVERN 3, SEVERN 4, SEVERN 5 and TRENT.

Page 2

2. TECHNICAL SPECIFICATIONS - Page 3

42 in² 42 in²

In compartment which is ventilated to

outside 137 cm² 137 cm²

21 in² 21 in²

Finish White stoved paint with contrasting

chassis

Weight Packed 21.0 kg. (46.2 lb.)

Weight without Water 17.8 kg. (39.2 lb.)

Weight with Water 18.6 kg. (41.0 lb.)

Water Capacity 0.75 litre (0.17 gall.)

Input 30.3 kW (103,000 Btu/h.)

Maximum Output 22.7 kW (77,400 Btu/h.)

Flow Rates 6.5 1/mm at 50

C rise

Minimum pressure head requirement at water

heater * 1 bar (14.6 psi) under flow conditions

Maximum pressure head 13 bar (189 psi)

Gas group G 20

Burner injector (140ff) 1.2mm marking 120

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Notes:

* Additional external pipework and fittings may affect the resistance and must be taken into

account on installation.

** The nominal burner pressure should be 12.5 mbar and will only be obtained if the

appliance inlet pressure is correct at 20 mbar even when the appliance is running at full

heat input. The meter should be capable of passing 1 00ft

/h of natural gas plus the

requirements of any other gas appliances.

MINIMUM CLEARANCES

For ease of servicing, allow as much clearance as possible below the appliance.

If the appliance is to be installed in a cupboard, the ventilation openings in the cupboard

must

NOT

blocked

NOT

USE

THE

CUPBOARD

FOR

STORAGE

Pilot injector 0.27mm marking A

Nominal burner pressure ** (maximum input) 12.5 mbar (5 in. w.g.)

Connections - Gas 15mm Copper Tail

15mm Compression

- Water

Balanced flues (telescopic) Wall thickness

available 100mm - 150mm (4in - 6in) - Part No

31/1

0321

150mm - 230mm (6in - 9in) - Part No

31/1

0322

230mm - 380mm (9in - 15in) - Part No

31/1

0323

380mm - 610mm (15in - 24in) - Part

0324

Flue Terminal Guard (Optional) Part No 10/1 0262

Above 60mm

Below 75mm

Sides 5mm (Each)

Front 220mm (To allow for removal of outer

case)

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Fig. 1

Page 3

3. INSTALLATION - Page 4

Fig. 2

A. LOCATION

1. If the appliance is to be fixed to a suitable existing terminal first isolate and remove the

old appliance. Leave the flue terminal in place. Retain the fixing nuts and washers. Make

good any damage to the brickwork or plaster around the terminal. Cut off the existing

pipework at a convenient point below the appliance.

2. If installing a new flue terminal, guidance is given on the template sheet supplied with the

terminal

pack

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NOTE: Where the appliance is to be installed into a SEDUCT the minimum duct required is

228mm (9in) deep, 349mm (15½ in) wide.

Fig. 3

3. Where the building regulations require it, a flue terminal guard should be fitted

symmetrically around the outer part of the flue terminal.

4. Unpack the water heater. Find the bags of accessories before discarding the packaging.

5. Slide off the bottom cover then remove the three screws securing the outer case and

carefully lift it off.

Fig. 4

6. Use the self adhesive discs supplied to cover the unwanted fixing holes in the back of the

new appliance as shown.

Page 4

INSTALLATION - Page 5

7. Fit the flue terminal sealing strip (packed separately in the carton) into the recess around

the

flue

aperture

the

back

the

appliance

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8. Lift the appliance into position, locating the flue outlet into the circular duct on the flue

terminal.

9. Secure with the appropriate nuts and washers.

Fig. 5

B. GAS CONNECTION

IMPORTANT: Blow out all foreign matter from the supply pipe before connecting to the gas

service cock.

15mm copper pipe to BS 2871 may be used for a simple supply not exceeding 3 metres

(10ft) from the gas meter. Where the installation contains many bends or the length is in

excess of 3 metres (l0ft), then the use of 22mm copper pipe is necessary.

1. Assemble the filter, ‘O’ ring and inlet tail to the gas inlet.

2. Depending on whether the main supply pipe is to be routed vertically or horizontally to

the appliance, connect the gas service cock (stamped ‘G) either directly to the gas inlet tail

or within the supply pipe. NOTE: The service cock should be as close to the appliance as

possible and the ON/OFF screw in an accessible position.

3. Ensure that the gas supply is turned OFF at the mains.

4. Connect to the gas supply.

5. Turn ON the gas supply and the gas service cock then test for gas soundness (BS

6891).

IMPORTANT: DO NOT TRY TO LIGHT THE APPLIANCE AT THIS STAGE. TO ALLOW

THE MAIN BURNER TO IGNITE WITHOUT THE OUTER CASE SECURED IN POSITION

HAZARD

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Fig. 6

Page 5

INSTALLATION - Page 6

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Fig. 7

C. WATER CONNECTIONS

IMPORTANT: Flush out all foreign matterfrom the supply pipe before connecting to the

service cock.

1. Assemble the filter, olive and inlet tail to the water inlet. NOTE: The inlet tail need not be

used as a vertical supply can be routed directly onto the water inlet.

2. Depending on whether the main supply pipe is to be routed vertically or horizontally to

the appliance, connect the water service cock either directly to the water inlet tail or within

the supply pipe. NOTE: The service cock should be as close to the appliance as possible

and the ON/OFF screw in an accessible position.

3. Ensure that the mains water supply is turned OFF.

IMPORTANT: When routing the supply pipe to the appliance, ensure that it can be lowered

by approx 25mm to allow for disconnection when servicing.

4. Connect the hot water supply pipes to the water outlet - 15mm compression.

5. Turn ON the mains water supply, turn ON the water service cock and open all the hot

water

outlets to allow water to flow. Purge the air from the system by closing the hot water

outlets starting with the lowest level and ending with the outlet at the highest level.

6. Check for water leaks and remedy if found.

IMPORTANT

NOT

TRY

LIGHT

THE

APPLIANCE

THIS

STAGE

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Fig. 8

D. LINT FILTER

This appliance has a lint filter fitted around the base of the pilot tube.

Ensure that the filter gauze is located inside both end caps and that the complete assembly

is correctly seated over the union nut at the base of the pilot tube.

Page 6

4. COMMISSIONING - Page 7

WARNING: The outer case of this appliance is not merely a cosmetic device. It is a

functioning component in the air supply to the burner and MUST BE replaced with great

care NOW, before any attempt is made to light the burners.

TO ALLOW THE MAIN BURNER TO IGNITE WITHOUT THE CASE IN POSITION IS A

HAZARD.

1. Refit the outer case ensuring it is correctly seated then secure (3 screws).

Fig

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Installation & Service Instructions

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