Trianco Contractor WM70 HE INTERNAL User guide

1
WM70 HE INTERNAL
OIL-FIRED CENTRAL HEATING BOILER
FOR BALANCED FLUE
USER, INSTALLATION,
COMMISSIONING & SERVICING
INSTRUCTIONS
To be retained by the householder
Please rea these instructions carefully before installing,
commissioning an using this appliance.

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HEALTH AND SAFETY INFORMATION
INFORMATION FOR THE INSTALLER AND SERVICE ENGINEERS
Under the Consumer Protection Act 1987 and the Health and Safety at Work Act 1974, it is a
re uirement to provide information on substances hazardous to health (COSHH Regulations 1998).
Trianco takes every reasonable care to ensure that these products are designed and constructed
to meet these general safety re uirements, provided they are properly installed and used.
To fulfil this re uirement, products are comprehensively tested and examined before despatch.
When working on the appliance, it is the responsibility of the user/engineer to ensure that any
necessary personal protective clothing or e uipment is worn appropriate to parts which could be
considered hazardous or harmful.
This appliance may contain some of the items below:
Insulation an Seals
Glass rope, mineral wool, insulation pads, ceramic fibre, glass insulation.
May be harmful if inhaled. May be irritating to the skin, eyes, nose and throat. When handling,
avoid inhalation and contact with the eyes. Use disposable gloves, face masks and eye protection.
After handling, wash hands and other exposed parts. When disposing, reduce dust with water
spray and ensure all parts are securely wrapped.
Glues, Sealants an Paints
Glues, sealants and paints are used in this appliance and present no known hazards when used in
the manner for which they are intended.
Kerosene & Gas Oil Fuels (Mineral Oils)
Avoid as far as is possible any skin contact with mineral oils or with materials contaminated with
mineral oils. The effects of mineral oils on the skin may vary according to exposure:
1) May remove the protective grease normally present on the surface of the skin, rendering it dry,
liable to crack and more prone to damage caused by cuts and abrasions.
2) May result in skin rashes. Seek immediate medical attention for any rash, wart or sore
developing on any part of the body, especially the scrotum.
Never breathe any mineral oil vapours. Do not fire the burner in the open (i.e. not properly situated
in the boiler) as misfiring may result in unburned oil vapours.
When handling mineral oils, a suitable barrier cream containing lanolin is highly recommended,
along with a strict routine of personal cleaning.
Under no circumstances should mineral oils be taken internally.

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CONTENTS
1. USER INSTRUCTIONS
Intro uction
How to use the boiler
After-sales service information
2. INTRODUCTION TO INSTALLATION
Installation notes
Flushing an water treatment
3. TECHNICAL INFORMATION
Boiler imensions
Pipework connections
Technical ata
4. INSTALLATION
Regulations / Health & Safety
Siting an clearances
System esign
Heating & hot water systems
Con ensate Pipework
5. OIL SUPPLY
Oil
Storage tank
Single pipe oil supply
Two pipe oil supply
Oil e-aerators
6. ELECTRICAL SUPPLY
Wiring iagram
7. MOUNTING
8. FLUES AND VENTILATION
Installation notes
Ventilation
Balance flue kits
9. COMMISSIONING
10. SERVICING
Proce ure
Baffle configuration
11. SPARES LIST
12. BURNER FAULT-FINDING
4
4
4-5
6
7
7
7
8
8
8
9
10
10
10
10
10
11
12
12
12
12-14
12-15
13
16
16
17
18
18
18
19-29
30
30
30-31
31
32
33-34

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1. USER INSTRUCTIONS
Please note, to assist Trianco in improving customer service, it
is important that the guarantee/registration card is returned.
INTRODUCTION
The Contractor WM70 HE has been designed and constructed
to give years of trouble-free service and these instructions are
provided to assist you in obtaining the best performance with
the least trouble and cost.
The boiler is designed to provide both domestic hot water and
central heating. It is supplied with an adjustable boiler
temperature control thermostat and a manual-reset high-limit
thermostat, re uiring little attention other than the setting of
any additional system controls (such as a room thermostat or
programmer).
TO FIRE THE BOILER
Before firing the boiler, ensure that the system is full of water,
that there is a sufficient level of oil in the storage tank, and that
all isolation valves are fully open.
Check that the time-switch/programmer is on and that the
room thermostat is calling for heat.
Set the boiler thermostat (fig 1) to the desired temperature.
Switch on the electrical supply; the burner will fire up and
continue to run until the boiler reaches the temperature set on
the boiler thermostat.
Set the time-switch/programmer to the times and programme
re uired. The boiler should now operate automatically, cutting
in and out according to the heat demand.
TO STOP THE BOILER
The boiler may be switched off by turning off the boiler control
thermostat fully anti-clockwise to the off position, ‘O’.
If the boiler is to be off for a long period of time, it is
recommended that the mains supply to the appliance is
switched off, or the time-switch/programmer (if fitted) is set to
the OFF position.
BOILER CONTROL THERMOSTAT
The boiler control thermostat allows you to adjust the
temperature of the water leaving the boiler. It is calibrated
between High and Low, in five intermediate settings,
corresponding to a temperature range between 80°C (High)
and 55°C (Low). The thermostat is switched off when the knob
is turned fully anti-clockwise to the 'OFF' position.
Experience will tell you which is the most economical setting to
suit your household.
HIGH-LIMIT THERMOSTAT
The high-limit thermostat is factory-set and re uires no
adjustment. Should the boiler thermostat malfunction and the
water temperature rise to 110°C, the limit thermostat will take
over and shut down the appliance.
The limit thermostat is located on the front of the control box
and can be reset by pushing in the red button. If the thermostat
operates fre uently, consult your service engineer, as there
may be a fault in the system.
Note: the high-limit thermostat can only be reset when the
water temperature has dropped by at least 20°C.
BURNER LOCK-OUT
If the burner fails to light for any reason, the boiler will go into
lock-out mode, indicated by the illumination of the reset button
on the burner control box (fig 2). To reset the burner, press
this button. If the burner returns to lock-out, wait for one minute
before pressing the button again.
If the burner still fails to light, follow the simple fault-finding
guide (page 5), before switching off the electrical supply to the
boiler and contacting your service engineer if the failure
persists.
Important: o not attempt to reset the burner more than
twice – constant attempts to o so may cause permanent
amage to components within the burner.
FIG 2
BOILER LOCK-OUT
LIGHT &
RESET BUTTON
FIG 1

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SYSTEM CONTROLS
ROOM THERMOSTAT
The room thermostat should not be positioned near a source of
heat, such as a radiator, or be exposed to direct sunlight, as
this will cause the heating to switch off before the room is up to
the correct temperature. Always follow the manufacturer’s
instructions for the best siting position of the room thermostat.
FROST PROTECTION
If the boiler is to be fitted externally to the property being
heated, the water in the system may be in danger of freezing
and, as such, it is advisable to protect the installation with a
frost thermostat, which will bring the heating on when re uired.
Where the system is not protected, the heating should be left
switched on and the room thermostat left at a low setting (e.g.
7°C) to prevent the building temperature falling too low.
If the system is shut down for a long period during very cold
weather, it is also advisable to completely drain the system.
However, too fre uent draining of the system should be
avoided, especially in hard water areas, as this could lead to
scaling of the boiler waterways.
See page 7 for flushing and water treatment.
SHUTTING DOWN FOR LONG PERIODS
If the boiler is shut down for any length of time, it is
advisable to have it serviced and thoroughly cleaned as soon
as possible to minimise corrosion of the heating surfaces.
OIL
The oil for your boiler is 28 sec. Kerosene class C2 to BS
2869.
Always ensure that the oil storage tank is topped up regularly;
do not wait until the tank is nearly empty before refilling, as
sludge and water could be sucked into the oil pipe, affecting
the operation of the burner and potentially reducing the life of
the pump.
After a delivery of oil, it is recommended that it be allowed to
settle in the tank for about half an hour before restarting the
boiler.
Sludge and water caused by condensation should be drawn off
at the drain-cock on the oil tank annually.
SIMPLE FAULT-FINDING
If the boiler fails to start for no apparent reason, carry out the
following checks before calling your service engineer:
1. Check for failure in the electrical supply.
2. Check for a blown fuse. If the fuse has blown and the
replacement subse uently blows again, switch off the
mains electrical supply to the boiler and contact your
service engineer.
3. Check that there is ade uate oil in the tank and that all
isolation valves are fully open.
4. Check for burner lock-out (see page 4).
5. Check for excess water temperature (see high-limit
thermostat details, page 4, for further details).
Note: If the boiler has been shut down due to a failure of the
power supply, it may be necessary to reset the time-
switch or programmer to the correct time, unless the
device has an in-built power reserve.
SERVICING
To ensure the efficient and reliable operation of the boiler it is
essential that the burner be commissione immediately after
installation, and prior to first use. The boiler re uires an annual
service thereafter.
IMPORTANT NOTES
1. Only an OFTEC-trained and registered engineer can carry
out commissioning and service work.
2. Electrical safety checks should be carried out by a
ualified electrical engineer.
3. It is the responsibility of the installer to ensure that the
boiler is commissioned immediately after installation.
4. It is a re uirement of the guarantee and any extended
warranty that an annual service is carried out.
5. The system water must always be protected by a
corrosion inhibitor.

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A ualified field service engineer is available to attend a
breakdown or manufacturing fault occurring while the
appliance is under guarantee.
The appliance must be made available for service during
normal working hours, Monday to Friday.
Please note, upon atten ance by a Trianco fiel
service engineer, a charge will be ma e on-site
where:
• The field service engineer finds no fault with the
appliance
• The cause of the appliance is due to lack of oil, or a
fault in the oil supply
• The cause of a breakdown is due to other parts of
the system not manufactured by Trianco
• The cause of the breakdown is due to incorrectly
fitted spare parts, or third-party spares not
designed for specific use with the appliance
• The appliance has not been correctly installed as
recommended in these instructions, or by
un ualified persons
• The breakdown occurs outside the guarantee
period
• The appliance has not been maintained correctly
• The breakdown occurs due to use of the appliance
not sanctioned by these instructions
• The breakdown occurs as a direct result of
unauthorised third-party work on the appliance
Important:
Invoices for atten ance an repair work carrie out
on this appliance by any thir party will not be
accepte unless authorise in advance by the
Trianco service centre.
TECHNICAL ASSISTANCE
A team of trained technical advisors are available to discuss
any problem with the appliance which may occur. In many
cases, the problem may be solved over the telephone,
eliminating the need for a service visit.
HOW TO REPORT A FAULT
Step 1:
Contact your installer or service engineer, who should
thoroughly check all recent work before the attendance of
our field service engineer is re uested.
Step 2:
If your appliance has developed an in-guarantee fault,
contact the Trianco service centre for assistance. You will
be provided with the name and contact details of our local
service agent.
If your own installer/service engineer is unavailable, contact
the Trianco service centre. Please be aware that a charge
may be made for any visit not covered by the appliance
guarantee.
Before contacting either the Trianco service centre or
the technical a vice line, please have the following
information rea y:
1) Appliance serial number, or your uni ue customer
identification number (issued upon registration of the
appliance with Trianco)
2) Description of fault
3) Date of installation
Boiler Serial No.: __________________________
Cust. ID No.: __________________________
Installation Date: ___/___/___
Corrosion Inhibitor Fitted: YES: ___ NO: ___
SERVICE CENTRE AND TECHNICAL SUPPORT
Tel: [phone] Fax: [phone]
Hours of Business
Monday – Thursday: 8:30 – 16:45
Friday: 8:30 – 14:30
AFTER-SALES SERVICE INFORMATION

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INSTALLATION INSTRUCTIONS
2. INTRODUCTION
The Contractor WM70 HE has been designed to conform to
European Directive/Standards BED 92/42 EEC LVD EN 73/23
EEC EMC 89/336/EEC.
The matched pressure-jet burner is exceptionally uiet in
operation and ensures clean and efficient combustion, with low
NOx emissions.
The boiler is designed for sealed systems up to a working
pressure of 3 bar, with the appropriate sealed system safety
e uipment.
To ensure that the boiler is operating at maximum efficiency,
the central heating return temperature should be 50°C or
above. Maximum performance will be achieved by maintaining
a differential of 20°-30°C between the flow and return water
temperatures.
This appliance is suitable for sealed, fully pumped systems
only.
Routine servicing can be carried out from the front of the boiler.
The boiler is fully automatic in operation and incorporates all
necessary safety controls to ensure safe and reliable running.
The boiler is supplied with the burner set for 28 sec. Kerosene
Class C2 to BS 2869 fuel to meet the Building Regulation
re uirements for low-level flue discharge.
BALANCED FLUE KITS
The boiler is supplied e uipped for connection to a Trianco
balanced flue kit (sold separately). These kits allow the boiler
to be installed in a wide variety of site conditions, from low-
level discharge through the wall, to high-level and vertical
discharge (see page 19 onwards for details).
The flue kit is available in low-level horizontal, vertical and high
level horizontal formats.
As a balanced flue boiler, the Contractor WM70 HE is a room-
sealed appliance which conforms to the re uirements specified
in OFSA100. All flue types are suitable for installation in a
garage.
FLUSHING AND WATER TREATMENT
The performance of the appliance could be impaired by system
debris or the effects of corrosion. New systems must be
thoroughly flushed to remove metal filings, solder, machining
oils and any other fluxes or greases before connecting the
boiler.
When fitting the appliance to an existing system, it is advisable
to clean the system by using an appropriate flushing and
descaling agent. Refer to BS 7593 [1992] for guidance.
System additives - corrosion inhibitors and all flushing
agents/descalers should be suitable for steel boilers and
comply with BS 7593 re uirements. It is strongly
recommended that a suitable anti-freeze product is applied to
the system after flushing.
Always refer to manufacturers' instructions.
Failure to flush an a inhibitors to the system will
invali ate the appliance warranty.
The appliance is esigne to be fitte to fully-pumpe
systems only. Failure to o so will invali ate the warranty.
The boiler must not be run without water in the system.
IMPORTANT NOTICE:
To comply with regulations in force, the boiler must be installe an commissione by an OFTEC-registere engineer. The
installation must comply with all requirements of current Building Regulations, Part L.
Failure to meet the terms of these requirements may invali ate the guarantee.
THE PERSON(S) WHO INSTALLS THIS APPLIANCE, SERVICES OF CARRIES OUT ANY REMEDIAL WORK, i.e. ELECTRICAL
FAULT-FINDING, MUST HAVE THE SUITABLE ENGINEERING QUALIFICATIONS.

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FIG 3
OUTLINE DIMENSIONS
3. TECHNICAL INFORMATION
ALL DIMENSIONS IN mm.
FIG 4
PIPEWORK CONNECTIONS

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Input (net) 74,723 BTU/h
Output (net) 70,970 BTU/h
SEDBUK Rating A
Burner See Burner Details Leaflet
Weight (empty) 91kg
Water Content 16 litres
Flow & Return 22mm Compression
Max. Operating Pressure (HTG) 3 bar (43.5 psi)
Test Pressure 4.5 bar (65.3 psi)
Starting Current 3.5
Running Current 0.77
Electrical Supply 230/240v – 50Hz 220W
Fuse Fused at 5 amp
Maximum Pressure 3 bar
Fuel Kerosene 28s BS 2869 Class C2
Hot Water Thermostat Adjustable between 55°C and 80°C
High Limit Thermostat Factory-set at 110°C (manual reset)
Casing Finish Stove enamel painted white
Thermal Insulation Boiler shell and casings insulated with glass fibre
Optional Extras Trianco balanced flue kit range (page 19)
Mo el Input Output
(non con ensing)
Output
(con ensing) Nozzle Pump
Pressure
CO
2
(%)
50,000 52,247 BTUs 50,000 BTUs 50,784 BTUs 0.45 x 80ºEH 120 psi 11.8
60,000 62,781 BTUs 60,051 BTUs 61,075 BTUs 0.60 x 80ºEH 95 psi 11.5
70,000 74,723 BTUs 70,970 BTUs 72,676 BTUs 0.60 x 80ºEH 135 psi 11.4
TECHNICAL DATA

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4. INSTALLATION
REGULATIONS
Installation of the boiler must comply with the following British
Standards and Regulations:
BS 5410: Part 1 – Code of Practise for Oil-Firing.
BS 5449 – Forced Circulation Hot Water Central Heating
Systems.
Building Regulations - Part J (England and Wales)
- Part F sect. 111 (Scotland)
- Part L
The Control of Pollution (Oil) Regulations
Current I.E.E. Regulations
Local Water Undertakings Bylaws
OFTEC Installation Re uirements for Oil-Fired Boilers and Oil
Storage Tanks, OFST 100 & OFST 200.
HEALTH AND SAFETY AT WORK ACT
The installer should be aware of his responsibilities under the
Act and provide, where necessary, appropriate protection for
all persons carrying out the installation. In the interests of
safety, it is re uired that the appliance is installed,
commissioned and serviced by and OFTEC registered
technician. A guide to safe working practices for oil-firing
technicians is available from OFTEC.
LIFTING
The appliance will re uire two people to lift into position, or
specialised lifting e uipment. Do not mount the boiler on the
wall unless all necessary precautions have been made.
Electrical work shoul be carrie out in accor ance with BS
7671:2001 by a qualifie electrical engineer.
SITING THE BOILER
Soun Levels
Despite the low sound levels of the boiler, the following factors
should be taken into consideration before installation:
(a) Some people are particularly sensitive to low noise levels
– discuss with the householder.
(b) Small rooms tend to amplify noise, particularly if the wall
construction is hollow or the surface tiled.
(c) A chimney passing through a bedroom will sometimes
transmit noise.
(d) Low-level flue terminals produce some exhaust noise, so
care should be taken when siting adjacent to neighbouring
property, patios and play areas. Refer to flue details (page
18 onwards).
(e) Due to the condensing nature of the boiler, a plume of
water vapour will be discharged from the flue. This should
be taken into account when siting the flue terminal. Refer
to section on flue systems.
Clearance an Service Access
When siting the boiler, ensure ade uate clearance is allowed
for making water and flue connections. Routine servicing can
be carried out from the front. See page 8 for clearance
dimensions.
SYSTEM DESIGN
To achieve the maximum system efficiencies, the heating
system should be designed to the following parameters:
Boiler Flow Temperature - 50°C to 80°C
Flow Differential Temperature - 20°C to 30°C
HEATING AND DOMESTIC HOT WATER SYSTEMS
The heating system should be installed in accordance with
current HVCA Codes of Practice and BS 5449 Part 1 – Forced
Circulation Hot Water Central Heating Systems.
Maximum water temperature is 80°C.
The flow and return connections are made via 22mm
compression fittings at the top-right of the boiler, and can be
run through either the rear or the top.
Where the boiler is also used for providing domestic hot water,
a double-feed indirect cylinder to BS 1566 Part 1 must be
used.
A drain-off cock is fitted to the underside of the boiler.
However, one should always be fitted to the lowest point on the
heating circuit.
Flush out the system to remove any residue before filling the
system.

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CONDENSATE DRAIN CONNECTIONS
The condensate pipe can be fitted after the boiler is positioned
and terminates from the base of the boiler casings.
Where possible, connect the condensate pipework to an
external waste drain.
If the boiler is to be fitted in a position where the external
ground level is higher than the boiler, and there are no internal
drains, a condensate pump can be fitted (refer to
manufacturers' instructions).
The drain pipe must be installed to allow the condensate to
drain naturally from the boiler, on a minimum fall of 1:20.
The drain from the boiler must be 22mm diameter pipework.
The pipework from the con ensate trap to the external
rain is not supplie with the boiler.
Upon successful installation of the condensate pipework, fill
the trap via the fill point on the condensate unit, pouring a
small amount of water within, until retained within the 'U'
section.
Examine the condensate pipework for any resultant leaks and
rectify accordingly.
Failure to fill the trap with water before firing the boiler may
result in damage to the drainage pipework and potentially allow
the escape of flue gases. Any damage caused as a result of
not filling the trap will not be covered by the appliance
guarantee.
IMPORTANT NOTES:
When running any external pipework from the trap to the drain,
it is essential that the pipework is kept to a minimum and is
insulated to prevent the condense from freezing.
MAINTENANCE
The trap should be inspected at regular intervals to ensure
correct operation, and should be checked as part of the annual
service schedule.
FIG 12
FIG 11 – CONDENSATE PIPEWORK

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5. OIL SUPPLY
OIL
The burner is factory-set to burn 28 sec. Kerosene Class C2 to
BS 2869.
Trianco makes no guarantee as to the satisfactory operation of
the boiler using fuels other than that which is stated above.
STORAGE TANK
The tank should be fitted with weather-protected fill and vent
connections, a drain-off cock, and an oil level indicator.
Size an Location of Tank
The tank should be large enough to allow for economic
deliveries and be located in an unobtrusive position, having
regard to the need for safety, filling, maintenance, and head of
oil re uired (see figs 13, 14, 15).
Steel Tanks
Steel tanks must comply with the re uirements of BS 799 Part
5: 1987 and should be mounted on brick or block piers, with a
waterproof membrane fitted between the piers and tank.
Plastic Tanks
Polyethylene tanks may be used, having several advantages
over traditional steel tanks:
(a) Pier supports are not re uired; the tank may be fitted
directly onto a flat surface.
(b) They do not corrode; therefore never re uire repainting.
(c) They are easier to handle because of lower weight.
(d) They are generally supplied with a 10-year manufacturer’s
guarantee.
Fire Protection
Whilst it is highly unlikely that a fire could start from a domestic
oil tank, protection is re uired from a fire which may originate
elsewhere. The tank should be at least 1.8 metres from a
building and 750mm from a site boundary. Where it is not
feasible to adhere to these limits, the building wall must not
have any openings other than those for ventilation, the wall
must have at least a half-hour resistance to fire, and must
extend 1.8 metres from any part of the tank.
Alternatively, a non-combustible radiation barrier can be
employed, which meets all the re uirements of BS 5410 Part 1.
This standard applies to tanks up to a capacity of 3,500 litres.
See current OFTEC regulations for further details.
To comply with Building Regulations, section J5:
1. Where the tank is close to a dwelling, fire protection must
be provided to the eaves, if less than 1.8 metres from the
top of the tank.
2. Cladding must extend at least 300mm beyond the tank.
3. The tank must be fitted on a non-combustible base.
Pollution Protection
To comply with Building Regulations, section J6, the tank
must be bunded (double-walled) if:
1. The tank is less than 10m from a stream
2. The tank is less than 50m from a well, spring, or other
source of drinking water.
3. The tank cannot be viewed from the point of delivery.
4. There is risk of oil reaching a manhole cover or drain in
the event of a leak.
5. The tank capacity exceeds 2,500 litres.
SUPPLY
A long-life flexible oil hose is supplied with the boiler. A filter
and shut-off valve are also re uired. These should be fitted as
shown on figs 13, 14, 15.
All oil line joints must be completely sealed and the total pipe
run should be flushed thoroughly before connection is made to
the burner. No soldered joints are permitted in the oil line.
Fire Valve
A remote-operated fire valve must be fitted in the oil supply
line, externally to the boiler, with the sensing phial located at a
point within the boiler casings, above the burner.
Single-Pipe Oil Supply (fig 14)
Where the lowermost part of the tank is above the level of the
burner, a single-pipe gravity system can be used. The oil
supply pipe should be connected to the suction port on the
burner pump via the flexible hose supplied.
When using the single-pipe system, it is important to convert
the fuel pump on the burner to operate as such: remove the
end cover and filter, then remove the bottom screw and insert
a ‘U’-shaped washer. Replace the screw, making sure it is fully
inserted. See the burner details leaflet for further information.
Two-Pipe Oil Supply (fig 15)
Where the lowermost part of the tank is below the level of the
burner, a two-pipe suction lift is necessary.
A spring-loaded non-return valve must be fitted in the suction
line to prevent the oil running back to the tank. No valves are
permitted in the return line. An additional flexible oil line will
also be re uired.
The oil pump is factory-set for use with a two-pipe system.
To comply with OFTEC regulations, a CD/10 form must
be complete an left with the appliance upon
installation.

13
OIL SUPPLY (cont.)
Notes:
1. The pump suction should not exceed 0.4bar, as dissolved
gas may be released from the oil, affecting combustion.
2. The return pipe must end at the same level as the suction
outlet to prevent loss of prime.
3. The outlet from the tank should be approximately 75mm
(3”) above the bottom to prevent sediment and water
being drawn into the supply line.
Single-Pipe Oil Supply with De-aerator (fig 13)
Where a two-pipe suction lift is re uired, but the return pipe
re uirement is too long, or impractical to run, an oil de-aerator
can be used. The burner should be piped as for a two-pipe
system, up until the de-aerator, when a single pipe can be
taken the remaining distance to the storage tank. The de-
aerator should be fitted at the closest point to the boiler,
externally to the dwelling.
A non-return valve is not re uired with this system. The pump
is supplied ready for fitting to an oil de-aeration device.
FIG 13
INSTALLATION WITH OIL DE-AERATOR

14
FIG 14
SINGLE-PIPE SUPPLY

15
FIG 15
TWO-PIPE SUPPLY

16
6. ELECTRICAL SUPPLY
230V single-phase 50Hz (fuse 5 amp)
Note: this appliance must be earthed and the electrical
supply cable must be of a greater length than the
current-carrying conductor cables (i.e. live and neutral
supply cables).
All electrical wiring must be carried out by a ualified
electrician, in accordance with current I.E.E. Regulations and
any local regulations which may apply.
The 230V – 50Hz electrical supply must be fused by a double-
pole switch, with a contact separation of at least 3mm in both
poles, and by a shuttered socket adjacent to the boiler (both
devices must meet the re uirements of BS 1363).
The minimum re uirement for the power supply cable is PVC
sheathed flexible cord, 0.75mm² (24x0.2mm, code designation
H05 VV-F or H05 VVH2-F), as specified in table 16 of BD
6500.
All cables entering the control box must be secured in position
by the use of strain-relief bushes (supplied, see fig 16 for fitting
instructions).
See wiring diagram, fig 17 for further details.
Important Note:
After wiring in the electrical supply, care must be taken
when attaching the control box to ensure no cables are
trappe between the boiler an the box.
High an Low Voltage Warning
In certain areas of the country, where there is a known risk of
high or low voltage fluctuations, the burner should be
prevented from starting by the use of a voltage-sensitive
device if the voltage drops or increases sufficiently to endanger
the installation.
FIG 16
Mains Supply 230V 1PH 50Hz
D/P Switch to suit L.A
Fuse 5 amp
FIG 17
WIRING DIAGRAM

17
7. MOUNTING
The boiler should be fixed to a suitable load-bearing wall using
the fasteners supplied. If these are not appropriate, other
fasteners may be used provided they are e ually as strong.
Remove the front door and outer casing assembly from the
boiler, moving to a place where they will not invite damage. For
ease of lifting, it may be useful at this stage to remove the
baffles and burner. Ensure all baffles are replaced in the order
shown on page 31.
Using the template supplied, work out the intended position of
the boiler and fix the template to the wall. Drill 6mm holes
where indicated and if using a horizontal balanced flue, cut a
hole 130mm diameter in the wall.
Remove the wall template and fix the two mounting brackets
provided to the wall where indicated.
Hang the boiler onto the lugs on the large mounting bracket
and drill through one holes in the oil pipe bracket. Fit a plastic
wall plug and screw back to the wall.
Fit the casing over the boiler, locating the back top return of the
casing over the smaller of the two mounting brackets on the
wall. Mark through the holes in the bottom rear of the casing
and drill through into the wall. Insert a wall plug and screw the
casing back to the wall.
Fit the door casing.
CAUTION: Uneven Loa
FIG 18 – WALL
MOUNTING TEMPLATE
See
fig 3
for flue side
exit dimensions

18
8. FLUES AND VENTILATION
VENTILATION
As the Contractor WM70 HE is a balanced-flue appliance, the
provision of an ade uate supply of combustion air is not
necessary. However, ade uate ventilation is re uired for the
cooling of the boiler controls if the appliance is to be installed in
a compartment or confined space (see fig 19).
The air opening should be positioned so as to cause the least
possible draught to the occupants and located so it is not liable
to be accidentally blocked.
British Code of Practice BS 5410: Part 1 re uires a permanent
air inlet opening of 550mm
2
per kW of boiler rated output
above 5kW.
The following air openings, shown on fig 19, are re uired for
the Contractor WM70 HE.
Output Detail ‘A’ (fig 19)
50,000 Btu/h 53cm²
60,000 Btu/h 69cm²
70,000 Btu/h 83cm²
FIG 19
VENTILATION

19
BALANCED FLUE SYSTEMS
The Trianco balanced flue system offers much greater
flexibility for siting the boiler compared with a conventional
chimney. The only re uirement is for a suitable outside
surface, through which to fit the terminal.
In addition to the siting benefit, the performance of balanced
flue boilers is virtually unaffected by high wind conditions as
the wind pressures are applied e ually to both the air intake
and discharge points, thus creating a balanced condition.
Whereas some balanced flue boilers rely on case sealing to
achieve a room seal, the Contractor WM70 HE has a sealed
air duct system which maintains room sealed performance
even when the casing is removed for burner commissioning
and service.
The use of the balanced flue principle also enhances the
overall thermal efficiency of the boiler, as the incoming air
extracts waste heat from the flue and returns it as pre-
heated air to the burner to aid combustion.
Balanced-flue condensing boilers are designed to operate at
low noise levels.
INSTALLATION NOTES
1. At certain times during operation, a plume of
condensation will be produced from the terminal. When
positioning, this should be taken into consideration to
ensure a nuisance is not caused to neighbouring
properties.
2. The flue terminal should not be positioned where the
products of combustion could enter the building (refer to
fig 20 for guidance).
3. Keep the terminal clear of infra-red sensing devices
such as those used to control security lighting.
4. Positioning of the terminal below a balcony or carport
should be avoided.
5. As the system operates under positive pressure, it is
essential that all flue joints are sealed correctly.
6. Only 28. second kerosene class C2 to BS 2869 has
been tested for use with this appliance.
Note: Trianco balanced flue kits have been designed and
tested exclusively for use with Trianco boilers. As
such, compatibility with other makes of boiler
cannot be guaranteed.
FIG 20 – TERMINAL POSITIONS

20
Horizontal Balance Flue Kits 2358 & 2359
Before commencing assembly, please make sure that you have correctly i entifie the placement of each pipe section an
that all ‘O’ ring seals are in position an well-lubricate .
Assembly Metho (figs 21 to 22)
1. Having decided the position of the boiler, accurately mark
out the position of the terminal and cut a circular hole
130mm in diameter through the wall.
2. Secure the air box (item 1) and underside gasket (3) to
the top of the boiler using the nuts provided. Feed the
elbow (4) through the opening on the air box and fit to the
spigot in the top of the boiler, ensuring the open end is
directed towards the cutout in the wall.
3. Fit the remaining two gaskets (3) and cover (2) to the air
box, ensuring an air tight seal is made.
4. Ensuring the 'O'-ring seal (8) is in position and well-
lubricated, slide the flue mid-section (5) through the wall
and locate over the inner elbow and outer connection on
the air box. Secure in position using the clamping strap (7)
provided.
5. Slide the terminal (6) through the wall and locate in the
flue mid-section. Adjust the terminal length as re uired,
making sure a minimum distance of 140mm is kept from
the end of the terminal from the external face of the wall.
Alternatively, fit the flue terminal to the mi -section before
locating through the wall.
6. Connect the hose from the burner to the socket on the
internal air chute using the jubilee clip provided.
7. Seal around terminal on the inside and outside wall with
an appropriate material.
Important Notes:
(a) To aid assembly, it will be necessary to apply a thin bead
of lubricant to all flue joints which incorporate ‘O’-rings.
(b) As the flue system operates under positive pressure, all
flue joints must be well sealed. All joints which do not
incorporate ‘O’-rings must be sealed with silicone sealant.
(c) As the boiler produces condensate during normal running,
it is important that all seals are made and the correct
gaskets used.
(d) To ensure that any condensate produced in the flue drains
away, incline the flue slightly upwards from the boiler.
EXTENDING THE FLUE
Should the horizontal length of the standard flues not meet
your re uirements, additional sections of flue pipe can be
purchased to extend the maximum wall thickness limit. 45º and
90º elbows can be purchased in order to offset the flue around
obstructions. See page 29 for details.
TERMINAL GUARD
Where the terminal is positioned in a place where there is the
possibility of contact being made by persons, or of damage to
the terminal, an approved terminal guard is necessary.
Generally, exhaust 2 metres above ground level alleviates the
re uirement for a terminal guard.
A suitable stainless steel terminal guard is available from
Trianco (part code 223920).
FIG 21
2358 & 2359 HORIZONTAL BALANCED
FLUE KITS