Page 1
chaffoteaux
chaffsteaux ltd.
et Maury
m
SHE!
installati
servicing instructions
Page 2
contents
Page 3
Pages 4 and 5
Pages 6 and 7
Pages 8 and 9
Page 10
: TECHNICAL DATA
: INSTALLATION
: SERVICING INSTRUCTIONS
: FAULT FINDING CHART FOR
SH 12 SHOWER HEATER
: SHORT LIST
GENERAL
The CORVEC SH 12 is a. balanced-flued instantaneous gas fired shower heater. It has been specifi-
cally designed to be used with a shower, and be connected directly to the mains cold water supply.
No purpose provided ventilation is required for the SH 12. It should be installed adjacent to the
proposed shower location providing that the terminal is positioned as recommended in the appropriate section of these instructions.
The installation of the shower heater must be in accordance with the relevant requirements of the
Gas Safety Regulations, Building Regulations and the Byelaws of the local Water Undertaking. 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 :
CP 33 1
CP 333 Selection and installation of town gas hot water supplies
BS 5440 Flues and air supply for gas appliances of rated input not exceeding 60 kW (1 st and 2nd
Installation of pipes and meters for town gas
Part 3 Low pressure installation pipes
Part 1 Domestic premises
family gases)
Part 1 Flues
2
Page 3
technical data
3
NATURAL GAS TABLE 1
Heat input
Heat output
Gas rate
Burner pressure
Main burner injectors marking
Pilot burner injectors marking
Waterflowrate-raised20oC(360F)
Waterflowrate-raised35oC(63oF)
Minimum water pressure (heater only)
Maximum water pressure
Note :
must be made for the resistance of the shower and associated pipework and fittings. This should be
mately O-2 bar (3 1b/in2).
...............................
..............................
................................
...........................
..................
..................
............
............
............
.....................
The
minimum water pressure is for the correct operation of the heater only. An additional allowance
11.3 kW 38,600 Btu/h
8.5 kW 29,000 Btu/h
1.08 m3/h 38.14 ft3/h
12.7 mbar
113 113
25
380 l/h
215 l/h 0.79 g-pm.
0.5 bar
10 bar
5.1 inswg.
1.39 gpm.
7.5 lb/in2
150 lb/in2
25
apprM-
Water j.&$
Water outlet
Gas
Height
Width.............-......-..-.-.....-
Depth
Weight
Space for fixing Top
Space for fixing Bottom
SpaceforfixingSides
SpaceforfigFront
HOLE FOR WALL LINER
Width..........-...................-.-.
Height .................................
WALL THICKNESS
Standard flue set
Extra available
.................
.............................
...................................
.................................
..................................
.................................
........................
......................
.......................
.......................
.......................... 75-355 mm
............................
............
1
..
Right hand
connection
Left hand
connection
Centre
connection
600 mm
267 mm
210 mm
10.7 kg
100 mm
152mm
NIL
130mm
240mm
125 mm
75610 mm
15 mm copper
15 mm copper
15 mm copper
23.6 ius
10.5 ins
8.25 ins
23.5 lbs
4.0 ins
6.0 ins
NIL
5.1 ins
9.5 ins
4.9 ins
3-14 ins
3-24 ins
3
Page 4
installation
The SH 12 is supplied in two cartons, one containing the
heater, the other containing the flue set and shower fittings.
INSTALLING THE BALANCED FLUE
The standard flue set is suitable for walls having a thickness
of 75 mm (3 in) to 355 mm (14 in). A flue set for wall
thicknesses up to 610 mm (24 in) is available to special
order.
Detailed recommendations for flueing are given in BS
5440 : 1. The following notes are intended to give general
guidance.
The shower heater must be installed so that the flue ter-
minal is exposed to the external air.
Termination should be on a clear expanse of wall ; the
terminal being preferably not less than 600 mm (2 ft) away
from a corner, recess or projection.
DO NOT install the terminal :
a) within 300 mm (1 ft), measured vertically, from the
bottom of an openable window, air vent or any other
ventilation opening.
b) within 300 mm (1 ft) above adjacent ground level.
C)
within 600 mm (2 ft) of any surface facing the terminal.
d) immediately beneath eaves or a balcony.
Where the lowest part of the terminal is less than 2 m
(6.6 ft) above the level of any ground, balcony, flat roof or
place to which any person has access and which adjoins the
wall in which the terminal is situated, the terminal must be
protected by a guard of durable material. (A terminal guard
may be obtained from Chaffoteaux Limited).
The air inlet, products outlet duct and the terminal of the
heater must be not closer than 50 mm (2 in) to combustible
material. Detailed recommendations on protection of
combustible material are given in BS 5440 : 1.
Preparing the Wall
The heater should be installed on a wah of flat noncom-
bustible material that will not reverberate.
thickness of the wall, make a hole 240 mm (9.5 ins)
wide x 125 mm (4.9 ins) high. If
there is no need to line it, since the wall liner will seal
off the cavity.
A II$&N,M clearance of 75 mm (3.0 in) should be left
above the top of the wall opening. No allowance is neces-
sary at the side of the heater. For dimensions see Dia-
gramPage2.
the hole is cut
Whatever the
accurately
Slide the wall liner through the wall ensuring that it is
horizontal and that the flanged end is flush with the face of
the wall. Trim to length if necessary, so that the outer end
of the liner is level with the face of the outside wall. Make
good around the wall liner (fig. 1).
FITTING THE TERMINAL
The terminal is fitted from the outside of the building by
fixing the two spring loaded chains over the hooks on the
inside of the wall liner (fig. 2). If the chains can not be
fitted to the hooks, fit them into the slots on the flue
bend brackets. Turn the hook through 900 if necessary.
If access to the outside of the building is difficult, the
terminal can be raised on a length of string and the chains
attached from the inside. If this procedure is adopted, it
must be ensured that there is no risk of damage to the
terminal, the building, or danger to persons in or about
the building.
INSTALLING THE HEATER
The heater is attached to the wall by 2 studs at the top and
2 screws at the bottom. These are supplied with the gas
service tap and foam gasket, and packed in a box placed in
the flue outlet.
Remove the front case, place the heater in position and
mark the fixing holes. Drill and plug the wall, and fasten
the wall studs in position. These studs can be screwed in the
wall by fast locking two nuts together on the parallel
thread and then use a spanner. Attach the self adhesive
foam gasket to the flat surface of the heater around the air
inlet spigot on the heater. Pull off the protective paper
while sticking down the gasket. Lift the heater into position
on the wall, locating on the studs and the air inlet spigot
into the wall liner. Secure the heater to the wall using the
nuts, washers and wood screws supplied. Unscrew the
screws A (frg. 3), then lift off the flue bend. Slide the flue
duct through the rectangular hole in the wall box and
engage it into the terminal by at least 25 mm (1 in), and
onto the flue bend as far as it will go. The duct must be
cut to length where necessary (fig. 4). Replace the screws
securing the flue bend.
GAS CONNECTION
The gas service tap supplied should be fitted to the centre
connection below the heater using the “filter washer”. A
15 mm dia. copper tail is also provided for direct fixing to
the gas supply
Fig. I
Fig.
2
4
Page 5
installation
Water
INSTALLING
“ATER CONNECTIONS
The installation of the water supply to the shower must be
in accordance with the relevant requirements of the Byelaws of the local Water Undertaking. The cold water connection to the heater is on the right with the hot flow on
the left. The connections on the heater are 15 mm copper
tubing. See diagram Page 2.
The heater is supplied with the water outlet connection at
the bottom. This can be changed to a top outlet by removing the outlet bend and replacing it with the short bend
supplied in the accessory box (fjs. 5). The blanking disc
fitted to the top of the heater should be transferred to the
base and the sealing ring and disc transferred to the top.
A Water Council approved Service tap must be fitted in the
cold mains water supply to the heater. It must be a type
having a fixed jumper washer. This tap is not supplied by
Chaffoteaux Limited.
&STALLING THE SHOWER
The shower set consists of :
- Handset
- Handset holder and bracket
- Hose and washers
- Hose retainer
- Control tap 15 mm compression x
- Secure the control tap to the wall in a suitable position not correct, consult the local gas region. The heat input
adjacent to the shower. Connect the pipe from the
SH 12to thetap.
l/2” BSP
NOTE
Byelaws, the installer of a shower which is supplied with
water direct from a water service pipe and which incorporates a shower outlet with a flexible connection, must ensure
that the shower outlet cannot reach a level lower than
13 mm (l/2 in)
that receives the water from the shower.
- Thread the flexible shower hose through the retainer and
PUTTING
- Open the gas and water service taps. Purge the gas and
- Fit the gas control knob and light the pilot by turning
- Turn the gas control fully anti-clockwise to the main
- Turn on the shower, the heater will now light.
- Check for gas soundness around heater gas components
- In accordance with the requirements of Water
above the spill-over level of the receptacle
attach at one end to the tap, and the other to the
handset.
INTO SERVICE
water supplies. Check for gas and water soundness.
90° anti-clockwise. It may be necessary to wait for the
pilot to purge, if so, wait a few moments then turn to
the “off” position and repeat.
gas position.
using sense of smell and leak detection fluid.
Check the burner pressure by fitting a gauge on to the
pressure test point on the end of the burner manifold.
The correct pressure is given in Table 1, Page 3. If the
pressure is not correct, check the pressure at the meter
outlet. This should be 20 mbar (8 ins wg.), the gas
installation should be examined for any possible
blockage if the pressure is not correct. If the pressure is
is preset and non-adjustable.
- Insert a screwdriver into the slot on the back of the
handset holder and twist to detach the bracket _
- Fix the bracket in the required position with the arrow
pointing UP.
- Replace the handset holder onto the bracket, slide it
downward and snap into position.
- Position the hose retainer in a similar manner.
Fig. 3 Fig. 4
- Remove the gas control knob.
- Replace the front case, gas control knob and water
temperature selector knob. The temperature selector
spindle should be screwed fully in, and the knob then
positioned opposite the word “hot”.
- Hand the User’s Instructions to the consumer and
instruct in the safe operation of the shower heater.
Fig. 5
5
Page 6
servicing instructions
Turn
off the gas at the gas inlet tap on the appliance and
water at the inlet water service tap commencing servicing.
1) Front Casing
- To remove, pull off the gas control and temperature
control knobs.
- Unscrew the centre fixing screw on the front of the case,
also the top and bottom fixing screws.
- Pull off the case taking care not to loose the rubber
spacer behind the centre fixing point.
2) Burner (fig. 6).
- Unscrew the pilot tube clamping screw A. and remove
clamp and tube.
- Remove burner manifold by unscrewing fixing screws B.
- Pull burner head assembly forward to remove, take care
not to trap the thermocouple or ignitor wires.
- The burner heads can be cleaned by brushing.
- Replace in reverse order, make sure that the gasket
between the manifold and the gas section is in place and
that the burner head assembly is correctly located on the
spigot at the rear.
3) Heating Body s/1,
- With the burner and flue bend removed, the heating
body can be inspected and cleaned in position.
- TO remove, drain the heater by unscrewing the water
governor A (fg. lo), collecting the water in a basin
below the heater.
- Remove the burner, see Section 2.
- Remove the screw holding the bottom of the heating
body skirt to the rear case.
- Release the two union nuts joining the heating body legs
to the water section.
- Remove the heating body.
- Clean the heating body by brushing with hot water and
detergent.
- Reassemble in reverse order, do not forget to replace
the skirt fixing screw and reinforcing strip.
4) Pilot
- unscrew the pilot tube clamping screw A (fig. 7) and
remove the clamp and tube.
- Blow through the tube to remove any dust.
- Remove the burner, see section 2.
- Unscrew the knurled pilot burner outer ring A (fig. 7).
- Unscrew the pilot body B with a 15 mm spanner. It may
be necessary to remove the heating body. Clean by
blowing or washing in water. Do not clean the holes
withawire.
- Blow any dust out of the gas section.
- Re-assemble in reverse order.
5) Thermocouple (fig. 8).
- Remove the burner, see Section 2.
- Remove the pilot, see Section 4.
- Unscrew the thermocouple nut D from the thermo-
electric valve and remove it from the wire (fig. 6).
- With a 7 mm box spanner, unscrew the nut E holding
the thermocouple into the gas section.
- Thread the thermocouple and wire up through the gas
section.
- Replace in reverse order.
6) Spark Electrode (fip .8).
- Remove the burner, see Section 2.
- Remove the electrode fixing screw F with a screwdriver
placed inside the heating body skirt.
- Pull off the electrode cable from the piezo cartridge.
- Lift the electrode out of the gas section.
- Reassemble in reverse order, and note that the slot in
the connector on the end of the electrode cable is vertical when pushed onto the cartridge.
7) Thermoelectric Vabe
- To replace, remove the thermocouple nut A (fii. 9).
- Unscrew cap from the side of the gas section and
withdraw the thermoelectric valve.
NOTE - This heater is fitted with a safety interlock. When
the pilot is turned off the heater can not be relit until the
thermocouple cools down and the lighting sequence is
repeated.
Fig. 6 Fig. 7
Fig. 8
6
Page 7
servicing instructions
Main Gas vaive
- To inspect and clean, remove burner.
- Disconnect the thermocouple and the ignitor lead.
- Remove the four fixing screws fastening the top of the
gas section to the base B (fig. 9). Also the two screws
at the back holding it to the rear case.
- Lift the gas section top off the base.
- Remove the gas valve spring.
- Lift out the gas valve.
- Clean the valve seating.
- Replace the facing rubber if necessary.
- Replace in reverse order.
“j Diaphragm (fii . 10).
- To replace, turn off the cold water supply and gas.
- Dram the heater by removing the water governor plug A
situated in the base of the water section.
- Unscrew the four water unions B on the water section.
- Unscrew the six screws C holding the water section to
the gas section.
- Remove the water section complete with the diaphragm
and bearing plate.
- Replace in reverse order - NOTE - fit the water governor
last. It is easier if the cold water inlet connection is
partially engaged before ftiing the screws and reconnecting the union nuts.
10) Water Governor
To clean, turn off the cold water supply to the heater.
- Remove the governor situated in the base of the water
section.
- Clean the components with water.
- Check that the spring loaded piston moves freely.
- Replace in reverse order.
11) GasFilter (fg. 11).
A gas filter is fitted between the gas service tap and the
heater.
- To clean, turn off the gas at the service tap.
- Unscrew the union nut attaching the tap to the heater.
- Lower the union nut and withdraw the filter which
also acts as a washer.
- Clean the filter by blowing or washing in water, do not
use solvents since the filter is made of nylon and may
disolve .
- Replace in reverse order.
12) Heat Input
The heat input is preset and non-adjustable. The heat input
and burner pressure should be checked against Table 1. If
the heat input/burner pressure is not correct, check the
working pressure at the pressure test point on the gas
service tap. This should be 20 mbar (8 ins. wg.). The gas
installation should be examined for any possible blockage
if the pressure is incorrect.
RECOMMENDED SERVICING SCHEDULE
For efficient and trouble free operation, it is recommended
that this heater is serviced annually. The following work
should be carried out by a competent person.
1) Clean the burner.
2) Clean the heating body by brushing.
3) In hard water areas it may be necessary to descale the
heating body. Use a solution consisting of 5 parts water
to 1 part hydrochloric acid. The water should preferably
be hot - ADD ACID TO WATER, NOT WATER
TO ACID.
4) Clean the pilot and thermocouple.
5) Clean the gas filter.
6) Clean the water governor.
7) Change the diaphragm every three years.
Fig. 9
7
Fig, 10
Fig. 11
Page 8
FAULT FINDING CHART FOR SH12 SHOWER HEATER
PROBLEM
PILOT FLAME DOES NOT
LIGHT
POOR PILOT FLAME i) Pilot injector dirty/damaged
PILOT WILL NOT
STAY ALIGHT
CAUSE
i)
Gas service tap closed
i i) Air in pipe
i i i)
Pilot injector blocked
-
i i) Wrong injector
i i i)
Pilot head blocked
i v)
Faulty pilot tube
i) Thermocouple not working
i i) Thermoelectric valve faulty
i i i)
Gas pressure low/variable
i v)
Terminal wrongly positioned
v) Badly assembled flue
v i)
Gas pressure too high
v i i)
Water rate too high
v i i i)
Incorrect venturi
i xj No venturi fitted
REMEDY
Open service tap
Purge line
Clean or change
Clean or change
Change for correct diameter
Clean
Clean or replace
Change thermocouple
Change valve
Check at inlet to heater
Reposition heater
Refit - Check sealing
Check working pressure at meter
Check water governor
Replace
Fit
Mi4IN BURNER DOES NOT
LIGHT/MAIN BURNER
EXPLOSIVE IGNITION
GAS TAP STIFF
WATER TEMPERATURE LOW
i) Gas service tap not open fully
i i)
Gas pressure low
i i i)
Water rate low
i v)
Gas valve push rod jammed
v) Diaphragm punctured
vi) Venturi blocked or loose
v i i)
Gas control tap faulty
v i i i)
Injector size
i) Pilot
i) Grease dried Clean and regrease
i i) Operating mechanism replaced incorrect
i) Water rate too high
i i)
Insufficient gas flow
i i i)
Water governor sticking
Open fully
Check at manifold and at inlet
with heater running
Check if water rate is sufficient (page 3)
Clean rod
Change diaphragm
Check venturi
Check operation of User’s gas control
tap
Check burner injectors are for natural
gas 1 .13 mm diameter
Check length and clean injector
Refit
Check water regulator rate
Check rate and user’s
Remove and clean or replace
tap
is open
8
Page 9
FAULT FINDING CHART FOR SH12 SHOWER HEATER
PROBLEM
BURNER STAYS ON
YELLOW FLAMES
SOOT FORMED
UNSTABLE FLAMES
CAUSE
i) Air in hot pipe
i i) Gas valve spindle jammed
i i i) Venturi blocked
i v) Gas valve “letting by”
v) Loose jumper on house stop tap
v i) Dead-leg on system
v i i) Dirt in water section
i) Heating body fins blocked
i i) Primary air supply restricted
i i i) Wrong injectors
i) Water in gas line
REMEDY
Purge line
Clean spindle
Remove and clean
Change valve facing
Replace water stop tap or pm down
jumper
Vent or remove
Clean water section
Remove heating body and clean
Check manifold
Check gas type and injector
Purge
HEATING BODY NOISE
INSUFFICIENT WATER FLOW
HEATER “SMELLS’ FROM
INSIDE BUILDING
HEATER “SMELLS’ FROM
OUTSIDE BUILDING AT
POINT OF TERMINATION
i i) Faulty flue
i) Scale
i i) Excessive gas
i) Water service tap partly closed
i i) Blocked venturi
i ii) Low water pressure
i v) Water governor faulty
v) Water governor sticking
v i) Foreign matter m,water section
i) Appliance newness
i i) Heater case not fitted correctly
i i i) Defective sealing around heater case
i) Gas rate too high
i i) Blocked flue
i i i) Insufficient aeration
i v) Delayed ignition due to poor pilot flame
v) Heater case not fitted correctly
v i) Defective sealing around heater case
Check terminal position and flue ducts
Des&e heating body
Check gas pressure
Check it is fully opened
Remove and clean venturi
Check water pressure
Change governor
Remove and clean or replace
Remove and clean
Smell will go within a short period of
time
Fit case correctly
Replace sealing strip
Adjust gas rate
Check and remove blockage
Check primary aeration
See remedy for “poor pilot flame”
Fit case correctly
Replace sealing strip
1 HIGH WATER FLOW
i) Water governor sticking
Replace
9
Page 10
Short list
61
77 76 75
126
122
KEY
No
1
122
126
166
16
17
61
69
70
71
72
73
74
75
76
77
78
G C No
263 487
263 488
263 489
366 096
366 160
263 545
366 152
263 365
387 251
387 252
262 544
DESCRIPTION
Front Case Assembly (not illustrated)
Gas Control Knob
Temperature Selector Knob
GasketWallLmertoRearCase
WallFixingScrew .............................
Wall Fixing Stud.
NutM7 ....................................
Washer
Gas Service Tap
GasFilter ...................................
Copper Tail
Nut
Washer
Adaptor Bend for Top Outlet
Thermocouple Assembly
Electrode & Lead Assembly.
Diaphragm ..................................
.....................................
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.....................................
.............................
.......................
.....................
..............................
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CHAFFOTEAUX LIMITED
Concord House - Brighton Road
................
No
OFF
1
1
1 36732
1 29091
2
2
2
4
1 31281
1
1
1 20747/ 14
1 22835114
1 26103
1 35087
1 34239
1
MARKERS
PART No
38741
36246
25617
5787
29094
5369
37309
20677
18197/30
Salfords - Redhill
SURREY RH15 DX
TCl : 02934 - 72744
Page 11
ESP002
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