Main Mitre-AS Guide rapide

INSTALLATION & SERVICE

INSTRUCTIONS

MITRE-AS

GAS FIRED -INSTANTANEOUS SINK WATER HEATER

G. C. APPLIANCE N° 51 476 33

THE GAS SAFETY (INSTALLATION AND USE) REGULATIONS 1984

In your own interest, and that of safety, it is the 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.

Follow these instructions carefully and comply with conditions set out in the current edition of the

Building Regulations Local Water Authority Regulations and relevant Codes of Practice relating

to installation of Domestic Water Heating Appliances. (CP 342. and BS.5546).

LEAVE THESE INSTRUCTIONS BY THE METER

 
Page 1
Ventilation Page 2
Fixing Page 3
Water connection Page 3
Water spout connection Page 4
Gas connection Page 4
Commissioning appliance Page 4
Checking burner pressure Page 5
Servicing instructions Page 6
To remove case front Page 7
To remove spark igniter Page 7
To remove. thermocouple/pilot/spark electrode Page 7
To remove heating unit Page 8
To remove electro. mag. unit Page 9
To remove burner assembly and injectors Page 9
To remove slow ignition diaphragm Page 9
To remove water diaphragm Page 9
Short spare parts list Page
11
TECHNICAL DATA
DIMENSIONS HEIGHT WIDTH DEPTH
Overall mm (in) 483 (19) 216 (81/2) 210 (8 1/4) Not including
swivel spout
WEIGHT EMPTY
kg (1b)
7.25 (16) 
Nominal heat input 11.6 KW : 39,580 Btu/h.
Nominal heat output 8.7 KW : 29,685 Btu/h.

NOMINAL BURNER PRESSURE

GAS GROUP GAS INLET PRESSURE NOMINAL BURNER

PRESSURE

INJECTOR

SIZE

N. G. mbar in. w.g. mbar in. w.g. mm dia

20- 85.7 2.3 1.25

THE MAXIMUM PERMITTED WATER PRESSURE THROUGH THIS APPLIANCE IS 10 BAR.

THE MINIMUM OPERATING HEAD THROUGH THIS APPLIANCE IS 10fT. (3 BAR).

ANY OTHER PRESSURE LOSSES INCURRED THROUGH THE ADDITION OF EXTERNAL

PIPES AND FIT-TINGS MUST BE TAKEN INTO ACCOUNT ON INSTALLATION.

THE NOMINAL WATER RATE IS 3.2 LITRES / MIN. (0.7 GALL/MIN.) AT A TEMPERATURE

RISE OF 40 °C (72 °F).

THE TEMPERATURE SELECTOR WILL GIVE A VARIATION IN TEMPERATURE RISE

BETWEEN 25 °C (45°F) AND 55 °C. (99°F).

VENTILATION AND AIR SUPPLY

This heater must be installed in accordance with B.S.5440 part 2.

This heater must not be installed in any room containing a ﬁxed bath or shower and shall not be

used to heat water for a bath.

A clearance of 51 mm (2 in) must be left at both sides of the appliance when installed to facilitate

ease of servicing.

FLUELESS INSTALLATION

This appliance incorporates an Atmospheric Sensing Device that will shut down the appliance in

the event of the room being insufﬁciently ventilated.

Page 2

A minimum clearance of 450 mm (18 in.) must be observed between the top of the appliance

and the ceiling installed.

The room in which the appliance is ﬁtted must be of greater volume than 6 m3 (215 ft. 3). In

addition rooms between 6 - 11 m3 (215 - 390 ft.3) must be provided with an air vent to the

outside atmosphere having minimum effective area of 35cm2. (5in 2) in addition to an openable

window.

For room greater than 11 m3 (390ft.3) an air vent is not required but the room must still contain

an openable window.

IMPORTANT

The heater is supplied ready for connecting the gas supply from the left hand side. If connection

of the gas supply from the right hand side is prefer-red the gas tap should be re-positioned

before ﬁxing. See gas connection section page 4.

FIXING THE HEATER

Pull handles and knobs from front of appliance.

Remove the two ﬁxing screws 1. Fig. 1 .

Carefully swing out bottom edge of case front to clear tap spindles. Disconnect wire lead from

rear of spark igniter and lift off case front. Deter-mine the correct position for the heater taking

into account instructions given under "VENTI-LATION AND AIR SUPPLY".

Place appliance in position on the wall and mark the wall for top ﬁxing point.

Drill hole in wall using an 8mm. drill and insert plastic plug. Screw stud into plug down to the

depth of the threads. Remove any burrs from screw. Place appliance on the wall ensuring that

the stud engages into the ﬁxing hole in rear of appliance. Using a spirit level ensure that the

appliance is vertical temporarily tighten the grub screw at the top rear of the appliance case.

Hold clips in position towards outside edge of slots as shown in Fig. 2 and mark wall. Slacken

grub screw and lift off appliance. Drill and plug wall to take clip securing screws. Place appliance

into position on wall, tighten grub screw and secure at bottom using the ﬁxing clips.

WATER INLET CONNECTION

It is strongly recommended that the use of loose jumper washer type cocks be avoided.

Flush out all foreign matter from the supply pipe before connecting to the appliance.

Connect copper tail and sealing washer to water service cock 2. Fig. 3 and connect water supply

using 15 mm. copper pipe to B.S. 2871.

IMPORTANT. Remove the sealing washer from copper tail before making any soldered joints to

prevent damage from heat. Replace washer on completion.

WATER OUTLET SHORT SPOUT (WHERE APPLICABLE)

Connect short spout and sealing washer 4 Fig. 3 to water outlet 3 Fig. 3 .

IMPORTANT: Remove swivel spout if already ﬁtted.

SWIVEL SPOUT CONNECTION (WHERE APPLICABLE)

Connect swivel spout and sealing washer 4. Fig. 3 to water outlet 3 Fig. 3 .

Fig. 1

Fig. 2

Page 3

MITRE - AS

WARNING

TO THE USER

PLEASE NOTE THIS APPLIANCE IS NOT SUITABLE FOR USE WITH SHOWERS.

Page 3A

IMPORTANT: Remove short spout if already ﬁtted.

REMOTE HOT WATER OUTLET CONNECTION

Fig. 3

IMPORTANT: SEE SECTION ON VENTILA-TION AND AIR SUPPLY

The appliance is ﬁtted with a remote hot water outlet. This outlet is for use when a hot water

supply is required in a room other than the room in which the appliance is ﬁtted.

The remote hot water outlet is situated on the water section to the left rear of the spout

connection.

Remove nut and blanking washer and connect copper tail (available from the manufacturer part

number 30011). Connect pipework from appliance to remote tap or shower.

IMPORTANT: Remove the sealing washer from copper tail before making any soldered joints to

prevent damage from heat. Replace washer on completion.

IMPORTANT: The hot and cold taps on the appliance DO NOT control the remote outlet.

If the spout outlet is not to be used on the appliance blank off the outlet to guard against

accidental use of taps. The nut and blanking washer taken from the remote hot outlet should be

used for this purpose.

NOTE : The swivel spout or the remote outlet or both can be connected to the appliance as

required.

GAS CONNECTION

The supply may be connected from the opposite side of the appliance by repositioning the gas

tap after releasing the two ﬁxing screws 6. Fig. 3 . The meter must be capable of passing 1.13 m

3/h (40 ft3/h) of natural gas CV. 1000 in addition to other requirements. The gas pressure

required at the appliance inlet connection is 20 mbar (8 in w.g.). A forward facing pressure test

point is located on the gas inlet body. Connect copper tail and sealing washer to gas inlet 5. Fig.

3and connect supply using 15 mm copper pipe to B.S. 2871.

IMPORTANT: Remove the sealing washer from copper tail before making any soldered joints to

prevent damage from heat. Replace washer on completion.

COMMISSIONING THE APPLIANCE

Turn on gas and water supply and check for soundness.

Remove screw and sealing washer and attach a pressure test gauge to burner pressure test

point 7. Fig. 3 .

Push spark electrode lead into rear of spark igniter and replace case front by locating lugs in the

top of the front panel into the mating slots in the appliance case. Push bottom of case front into

place and secure with two screws 1. Fig. 1. Re-ﬁt all handles and knobs ensuring that the blue

marked knob is ﬁtted to the right hand front spindle and the red marked knob is ﬁtted to the left

hand front spindle.

Open gas tap fully, anti-clockwise, the tap is in the open position when the "FLAME" symbol on

the gas tap handle is visible.

Turn the burner control knob to the spark position marked

Repeatedly press and release the spark igniter button marked until the pilot is lit.

The pilot ﬂame can be observed through the viewing window.

Once the pilot is lit wait 10 seconds and turn the burner control knob to the working position

marked

If the pilot goes out wait one minute and repeat the above operations.

Turn on the hot tap and check ignition of main burners.

Page 4

CHECKING BURNER PRESSURE

Allow burners to operate for one minute before checking the pressures shown below.

GAS GROUP GAS INLET PRESSURE NOMINAL BURNER

PRESSURE

INJECTOR

SIZE

N.G. mbar in. w.g. mbar in. w.g. mm dia

20 85.7 2.3 1.25

After checking, turn off hot water tap. Remove pressure test gauge and replace screw and

sealing washer.

IMPORTANT

Remove the protective vinyl ﬁlm from the namebadge. Draw the attention of the user to the

warning label on the outer case. Hand the users instructions to the consumer.

Explain fully how to operate the appliance.

SERVICING INSTRUCTIONS

Operate the heater and check the following points.

Check List Action

Does the pilot ﬂame ignite?

Does the pilot light go out after a

short period?

Check the spark igniter and spark

electrode and replace the units if

necessary.

Check for electrical shorting.

Check the spark gap, the gap should

be between 3 mm-4 mm. See Fig. 6 ..

This appliance is ﬁtted with a "Heat

Sensor" positioned on the right hand

side of the heating unit.

Using a B.G.C. multimeter check for

continuity through the thermocouple

circuit (with the appliance cold). If a

fault is found it will be due to either a

faulty heat sensor or a faulty thermo-

couple.

To check the heat sensor remove it

from the cir- cuit and connect the two

leads together. Re-check the circuit, if

continuity is established then the heat

sensor is faulty and needs replacing. If

continuity is not established then the

thermo- couple is faulty.

Remove the deﬂector from the top of

the appliance and check the heat

exchanger. If the heat ex-changer

shows any signs of blockage remove

the heating unit and clean by brushing

or washing. If after checking the above,

the pilot ﬂame will not ignite or the pilot

ﬂame ignites and goes out after a short

period, turn off the appliance open the

doors and windows in the room and

well ventilate the room.

After ensuring that the room been well

ventilated light the pilot ﬂame and

check that it remains lit. If not, replace

the atmosphere sensing device. See

the Short Parts List at the end of this

booklet.

Is pilot ﬂame correct? Clean pilot assembly.

Page 5

Does thermo-electric ﬂame safety device open

and close correctly?

This appliance is supplied with an

adaptor to enable the thermocouple

circuit to be tested using a B.G.C.

multimeter.

Check that the pilot strikes

thermocouple correctly. Replace

thermocouple and/or electric

magnetic valve if necessary.

Is burner pressure correct? Ensure gas inlet pressure is

sufﬁcient.

Ensure main gas valve-is fully open.

Are there any water leaks? Check tightness of connections.

Replace sealing washers if

necessary.

Are there any gas leaks? Check tightness off connections.

Replace sealing washers if

necessary.

Does main burner extinguish quickly when hot

water tap is turned off?

Check that push rod in water section

moves freely. Lubricate if necessary.

Is heater noisy in operation? Check for ﬂame "lift" on main burners

De-scale the heat exchanger if

necessary (See Section "TO

REMOVE HEATING UNIT").

1. TO REMOVE CASE FRONT

Pull handles and knobs from spindles at front of appliance. Remove two ﬁxing screws 8. Fig. 4 .

Carefully pull out bottom edge of case front to clear tap spindles.

Disconnect wire lead (push ﬁt) from rear of spark igniter.

Lift case front and remove.

Re-assemble in reverse order ensuring that the red marked knob is ﬁtted to the left hand front

spindle and the blue marked knob is ﬁtted to the right hand front spindle.

Fig. 4

2. TO REMOVE SPARK IGNITER

Remove case front, see Section 1 .

Pull retaining clip and washer from around the spark igniter behind case front. Pull spark igniter

forwards through case front.

Re-assemble in reverse order using a new "Push Fix" retaining clip (Part Number 30265).

3. TO REMOVE THE SPARK ELECTRODE, PILOT, THERMOCOUPLE, HEAT SENSOR,

PILOT REGULATOR AND ATMOSPHERE SENSING DEVICE.

IMPORTANT : Care must be taken when handling this assembly. The bi-metal strip MUST NOT

be touched by hand, skin contact may effect the operation of the control.

Page 6

IMPORTANT: The bi-metal sensor and its valve ﬂap MUST NOT be mechanically opened or

adjusted in any way.

Turn off the gas. Remove the case front see section 1.

Release pilot supply ﬁxing screw 9. Fig. 5 do not remove the screw from the pilot assembly, do

not lose the sealing washer.

Release the thermocouple nut 10. Fig. 5 .

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