MHS Boilers AK Series User manual

L285
04/09/2006
Installation
and
User Guide
AK Series
Gas Fired Boilers with
Atmospheric Burners
81 - 260 kW
3 Juniper West Fenton Way
Southfields Business Park
Basildon Essex
SS15 6SJ
Phone [phone] / Fax [phone]
www.mhsboilers.com

AK NO : UGM-AK-03/04
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CONTENTS
Page
1. INTRODUCTION 2
2. TECHNICAL INFORMATIO
N
3
2.1. Efficiencies 4
2.2. Flue gas temperatures 4
2.3. Section design 4
2.4. Safety features 5
2.5. Burner 5
2.6. Water side of boiler 5
3. PREPARATIONS BEFORE ASSEMBL
Y
6
3.1. Flue design and chimney installation 6
3.2. Gas supply 7
3.3. Ventillation 7
3.4. Boiler room arrangement 8
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culation system 9
#3.6. Safety of water circulation system 10
3.7. General remarks on heating system 10
4. ASSEMBLY INSTRUCTION
S
11
4.1. Delivery mode 11
4.2. Assembly of boiler group 12
4.3. Assembly of boiler insulation and casing group 16
4.4. Assembly of gas train 18
4.5. Assembly of gas valve multiblock 19
4.6. Electrical installation 20
4.7. Control panels 26
5. OPERATION 27
5.1. Gas valve multiblocks 27
5.2. Minimum pressure switch setting 28
5.3. Outlet pressure settings 28
5.4. Rapid stroke adjustment 29
5.5. Pressure drop diagram of gas valve multiblocks 30
5.6. Gas valve multiblock operational sequence 32
6. MAINTENANCE AND CLEANIN
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33
7. TROUBLESHOOTING 34
8. EXPLODED DRAWINGS 36
9. SPARE PARTS LIST 39
ANNEX: BOILER ASSEMBLY CERTIFICATE 42
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1. INTRODUCTION
The AK is a cast iron sectional boiler for gas firing with atmospherical burner. AK series are CE marked on product
identification number 86/AT/574 to:
Gas Appliances Directive (90/396/EEC)
Boiler Efficiency Directive (92/42/EEC)
Electromagnetic Compatability Directive (89/336/EEC)
and conforms the requiremets of
EN 656: Gas-fired central heating boilers; Type B boilers of nominal heat input exceeding 70 kW but not exceeding
300 kW.
EN 50081-1: Electromagnetic compatibility. Generic emission standard. Residential, commercial and light industry
EN 50082-1: Electromagnetic compatibility. Generic immunity standard. Residential, commercial and light industry
AK series boilers have been designed for firing natural gas and LPG with a two stage operation whose nominal heat
outputs ranging from 81,4 kW to 260,5 kW. Boiler series are supplied with P2-A control panels for two stage
operation (minimum/maximum/off) as standard accessory, or P3 control panels for automatic regulation in respect
with outside and room temperatures on special request. P3 control panels will also be used for controlling mixing
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.
#AK series boilers are suitable for central heating and indirect hot water supply at working pressures not exceeding
6 bars, and working temperatures not exceeding 110 C. The boiler must never be used for direct water supply.
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2. TECHNICAL INFORMATION
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2.1. EFFICIENCIES
Values given according to average boiler water temperature of 70 C
2.2. FLUE GAS TEMPERATURES
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Values given according to average boiler water temperature of 70 C
2.3 SECTION DESIGN
The original heat surface design unique to AK series boilers in
forms of water drops yield optimum heat transfer rate to boiler
water with minimized resistance in flue.
Thanks to latest flexible casting technology, The AK ensures
maximum reliability and longer life with high thermal stress
resistance.
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2.4. SAFETY FEATURE
S
A safe operation throughout lifetime of boiler is ensured by following components accompanied:
* Low pressure safety switch
* High pressure regulation
* Four magnetic valves including pilot ignition
* Double ionization
* Smooth changeover from pilot ignition to main ignition thanks to ionisation controlled pilot ignition valve.
* Chimney sensor
* Gas inlet filter
* 3 thermostats to control boiler water temperature
* A standard service box containing ignition sequence controller and a fuse isolator otomate
2.5 BURNE
R
The special design AK series atmospheric burners hold following techincal features:
* Stainless steel body
* Low CO and NOx emissions without pollutant release in environment.
* Operation with too low noise levels
* A two stage operation in accordance with supplied control panels saves energy, and ensures more comfort.
* Less requirements of maintenance
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#2.6. WATER SIDE OF BOILE
R
The fully watercooled sections are joined by cast iron conical nipples, and distribution pipe fitted to the return
ensures even the temperature distribution throughout the boiler. The cast iron sections are to BS.1452 Grade 200
with 7 mm wall thickness. Return and flow connections to heating system are provided by flanged stub-pipes on
either left or right hand side of boiler outboard the casing.
For ease of installation, the return and flow connections can be arranged on the same or different sides. However,
the gas inlet pipe must be installed on the opposite side to the return connection.
The water distribution pipe must be used in every unit of 12 sections and above to ensure a homogenious
temperature dispersion inside boiler sections with
prevention of vapour formation.
Under no circumstances should the boiler be fired
when its circulation volume is less than
a recommended minimum volume calculated
according to the following formula:
The table on the right hand side provides hydraulic
resistances at water volumes relative to boiler Dt
flow/return. The difference between flow and return
temperatures of the bolier should not be greater than
20 C to provide convenient operating conditions in
the boiler:
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hm
kWOutput /
70 3
=

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3. PREPARATIONS BEFORE ASSEMBL
Y
3.1. FLUE DESIGN AND CHIMNEY INSTALLATION
Boilers must be connected to an independent chimney, using the shortest flue canal possible, starting from flue
outlet of draught diverter where there is a flue ring for easy connection, which should be insulated by mineral wool or
similar material. Flue canal must be placed at a rising slope of 10°-45° between flue and chimney. Conditions
creating higher resistance to gas flow such as elbows should be avoided in flue canal. The flue canal outlet to the
boiler should not support the weight of chimney.
At discharge from the boiler, the flue gasses should be in a balanced state, consequently, the function of the
chimney is only for the disposal of the flue gasses to atmosphere via a required draught. Chimney calculations
should be carried out in compliance with the standards and mandatory regulations. Conditions of existing chimney
should be checked and proper precautions should be taken against excessive cooling and condensation (such
as applying a chimney sheet made of stainless steel grade 316 and surrounding with insulation). Positive draught
conditions must be avoided. Negative draught conditions should be contained within -5 mm wg at a level of 85 cm
above flue ring of draught diverter for optimum boiler performance.
For installations of two boilers with connection to the same chimney, following technical regulations shall be taken
into consideration:
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3.2. GAS SUPPL
Y
The installation must be in accordance with relevant standards and mandatory regulasitons. The local gas supply
authority should always be contacted at the design state to ensure an adequate supply is available. An existing
service pipe must not be used without prior consultation with the local gas supply authority and the supply must be
made through a suitable meter.
3.3. VENTILLATION
The installation must be in accordance with relevant standards and mandatory regulations, in respect with given
following table. An adequate fresh air ciruculation must be ensured in boiler room for efficient and safe operation of
whole boiler system.
For natural ventillation grilles with minimum free areas given in following table for a single boiler shall be provided at
high and low level, unless otherwise stated in local regulations. Upper and lower ventillation grilles should be
installed as close as possible to levels of floor and ceiling of boiler room. Maximum vertical distance between upper
grille and ceiling level should be 40 cm, and 50 cm between lower grille and floor level.
For exposed boiler houses, grilles should be provided on two or more external walls and care should be taken in
sitting boilers so that they are not affected by adverse draughts or situated next to powerful fans or other such
equipment.
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# For underground boiler houses, or those where communication with the outside is not possible then mechanical
ventillation may be used. Volumes of air for mechanical ventillation are given in the prevailing BS. For mechanically
ventillated boiler houses it is possible to have mechanical inlet air at low level and natural extract air at high level,
all volumes andd grilles should be designed on the values given in the same table. It is not allowed to have natural
inlet air and mechanical extract. In all cases of mechanical ventillation the fans should be interlocked so that the
boiler will not run unless the fans are running.
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3.4. BOILER ROOM ARRANGEMENT
The installation must be arranged in accordance with Mandatory Regulations and Codes of Practice. The following
sketch shows the recommended minimum dimensions of clearance around the bolier for servicing and maintenance
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# As boilers are equipped with a water distribution pipe which is installed from inlet connection through boiler lower
waterways, there should be enouh space left as much as relevant boiler width, between boiler inlet and coinciding
side wall. The boiler inlet and outlet connection, and thus the position of water distribution pipe may be arranged
either on the right or left hand side of boiler in respect with boiler room size and heating system installed.
Before assembly of boiler sections, a raised plinth should be constructed in boiler room to support boiler wieght in
accordance with following recommended dimensions:
Boiler room should not be used for any other applications, floor should always be kept dry and clean. Any obstacles
in front of ventillation openings must be avoided. The boiler room air openings must conform to the norms prevailing
locally. Any irregular electrical installations in boiler room should be replaced. The circulating water in boiler and
heating system must never be taken out for any domestic usage. Water level should be checked periodically with
a hydrometer.Nnever add water to the system when boiler is hot. Never drain the water unless it is necessary.
Should odour is sensed in boiler room, first close the valve before gas flow meter. Never use match and never smoke
in boiler room. Never turn electricity on/off. Ventilate the room opening doors and windows and consult authorised
installer staff or Gas Dealer Company immediately.
Follow instructions for periodic cleaning and maintenance operations whose procedures given further in this manual.
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3.5. WATER CIRCULATION SYSTEM
The system design must provide water flow rates commensurate with boiler output and the temperature difference
between flow and return should not exceed 20 C, or 25 C at most.
Water levels should be checked regularly and any leakages corrected in order to keep system water make-up
to a minimum, because excessive make-up will lead to salt deposits forming in the boiler waterways Causing
local overheating and damage to the boiler sections. Where there is doubt as to the quantity of water make-up,
a water meter should be fitted.
Boiler water systems should be thoroughly flushed and cleaned before a new boiler is installed and system water
should be treated by a reputable specialist and best practice observed. Consideration should be given to the fitting
of sludge traps and strainers if site conditions warrant them.
For heating systems with maximum boiler temperature up to 100 C, the necessary water purification shall be in
accordance with VDI 2035:
Boiler capacity range Nr. Requirements at the filling and auxiliary water
100 < Q in kW <350 1No requirement is needed, if content of Calcium
Hydrocarbonate (CA(HC03)) is max 2 mol/m³, and if no
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# take place
350 < Q in kW <1000 2Like 1, however content of Calcium Hydrocarbonate is
max. 1,5 mol/m³
1000 < Q in kW 3In this case, quantity of water, which can be fed without
softening, is to be determined after VDI 2035 equation
(9). If the system needs more filling and auxiliary water,
this must be demineralized.
The maximum quantity of water Vmax, which can be re-fed without softening as filling and auxiliary water, is
determinable after equation (9) the VDI 2035 sheet 1:
Vmax in m³ =0,0313 x Q in kW
/
Concentration of (CA(HC03)) in mol/m³
The quality of water is important. The recommended hardness of water: 1-3 mol/m3 (1 mol/m3=5.6 dH), PH:8-9.5
NOTE !
We strictly recommend to use water treatment products in heating system prior to first operation of the boiler. Such
water pre-commission products will protect the heating system against any further attack from corrosion or
limescale, and thus prevent
Boiler noise,
Sticking pumps,
Radiator cold spots,
Unestimatad thermal shocks on boiler sections,
saving energy and extending whole heating circuit operation life.
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Failure to apply and maintain the correct water treatment to prevent the formation of scale and corrosion within the
the heating system will render all appliance warranties null and void.
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3.6. SAFETY OF WATER CIRCULATION SYSTEM
The system can be built either open vented or pressurized. In case of open vented heating system, an open type
expansion tank acoording to DIN 4807 Part 2 shall be installed at the heighest level of hydraulic circuit. Delivery
and return lines between expansion tank and boiler shall be constructed in aacordance with DIN 4750. No globe
valves must be installed on delivery and return safety lines. Safety lines should be attached to inlet and outlet lines
of boiler at points as close as possible to boiler, using the shortest possible
vertical way between expansion tank and boiler.
A hydrometer shall be installed on delivery line from boiler at a same level with top of boiler. After filling heating
system, the minimum water level should be recorded on hydrometer in order to check water level during operation.
In case of pressurized heating system a pressure relief valve according to TRD 721 shall also be installed on heating
system to ensure safety besides closed type expansion vessel.
3.7. GENERAL REMARKS ON HEATING SYSTEM
Gas supply line, water delivery system, and electrical installation circuit must not come into contact each other.
Gas supply line must never be routed throughout the boiler to burner, and must be made of non-combustible
material.
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earthing line is
# installed, or there is unsufficient earthing application.
The mains supply must be 220 V AC and 50 Hz.
The main electric supply to the system should be established with ON/OFF button is switched ON. Switching ON
this button is a priority to operation of an AK boiler system.
The electrical and mechanical installations on boiler itself or in heating system should not be interfered, and no
change in settings are carried by unauthorised staff. This may result in further operational errors and danger in
boiler room. The safety accessories should ont be touched for any reason. In case of failure in operation, local
gas supply authority must always be contacted.
Boiler should not be fired with any source other than installed pilot ignition system. In case of controlling boiler
room, a flashlight should alwals be used.
The chimney sensor operates at 220 V AC, and thus never be touched in all cases unless main electrical supply
to heating system has been cut off for a maintenance operation or seasonal shutdowns.
The boiler should not be installed where there is risk of in contact with explosive materials.
The water delivery system and hot water supply circuit should be protected against any dirth by strainers. A non
return valve should be installed on main sanitary water supply to hot water heater.
If three or four wal motor valve is installed in water delivery system, a shunt-pump between inlet and outlet
connections of boiler must be used.
Pipings blocking water circulation in delivery system should be avoided. In worst cases, automatic air relief valves
should be installed where there is risk of high temperatures and vapor formation.
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4. ASSEMBLY INSTRUCTIONS
4.1. AK SERIES BOILERS DELIVERY MODE
4.1.1. Boiler block: Disassembled boiler sections are delivered attached together on a pallet.
4.1.2. Accessory box: A standard accessory box contains the materials used in the assembly of the boiler block
such as nipples, fibre-glass ropes, flow and return connections, gas pipes, service panel, controy panel, retarders,
gas valve and its accessories.
4.1.3. Casing/insulation box
4.1.4. Gas manifold box contains atmospheric burner together with boiler staybolts and
water distribution pipe (12 Sections and Above).
4.1.5. Draught diverter which is delivered on a particular pallet.
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Picture 4-1. AK boiler delivery mode.
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4.2. ASSEMBLY OF BOILER GROUP
Number in paranthesis refer to position numbers in exploded drawing:
1. Start with left or right section (6,2), clean nipple ports and nipples using cloth and parafin. Apply red lead dye
onto nipples (3) (Pic.4-2) and place nipples squarely in each nipple port and, using a wooden mallet, lightly tap
nipple into port to secure (Pic.4-3).
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#2. Apply grey paste jointing compound into paste grooves of right or left section and coinciding face of one
intermediate section (Pic 4-4) with sufficient amounts which is suplied as standard in accessory box.
Picture 4-4.
Picture 4-5.
3. Fit the intermediate section (5) squarely onto nipples of the right or left section and secure by using a wooden
mallet. Check the condition of grey compound between sections, and apply additional compound if there are
spaces free of this compound, or where the amount of the compound is not sufficient. Make sure that compound
grooves are sealed throughly (Pic 4-5).
4. Continue boiler assembly repeating the same procedures with other intermediate sections. Apply "Compression
Tools" routing them through bottom and top nipples as shown in following picture. We recommend to carry a
compression process after fitting 2 or 3 intermediate sections at most for better secure of flue gas system (Pic 4-6).
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Picture 4-6. Picture 4-7.
5. After assembly of all sections, apply compression tools for the last time, and before loosing them, fit upper and
lower staybolts (7) using M12 nuts and A13 washers (9,8). After fitting all the staybolts, leave whole free length
towards to one side of the boiler (Pic 4-7).
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# Do not use excessive force to tighten the nuts up on the staybolts, from 48 to 54 Nm (35 - 40 lbf/ft) torque is
recommended.
Picture 4-8.
Picture 4-9.
6. Fit distribution pipe (12 Sections and above) with gasket squarely into the return connection with the holes
facing upwards as shown in Pic 4-8. Fit flanged stub-pipes (27) with their gaskets (16) to the flow and return
connections on right or left section. Fix the stub-pipes using M12 nuts (19) and A13 washers (18) (Pic 4-9).
7. Fit pocket (R3/4") for capillary tubes (10) on left or right
section in respect with water outlet side (Pic 4-10). In case
of P3 economy panel usage, fit a R1/8" pocket on the same
left or right section as well. In standard delivery a R1/8"
tap should be used for covering this threaded hole. Fit
R3/4" and R1/8" tappings on opposite side section.
Picture 4-10.
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8. Fit blank flanges (17) on right or left section other than that
of water inlet and outlet connections are carried, using gaskets
(16), M12 nuts and A13 washers (18 and 19).
Picture 4-11.
9. Hydrostatic test
At this stage, these connections must be pressure tested by blanking off the flow and return connections by filling
the boiler through a gate valve installed on return blank flange line, and venting through a gate valve installed on flow
blank flange line.
Hydrostatic test shall be carried out at a pressure gauge of 1.3 x P; where, P is the maximum operating pressure
of boiler. Duration of test should be at least 30 minutes.
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n
d connected to
# heating circuit. After hydraulic test, the boiler should now be connected to heating system, and the system water
should be treated as given previously.
10. Place flue gas retarders (20) into between sections as
shown in Pic 4-12. Fix ceramic-fibre insulation sheet (40)
in pieces onto surfaces where drauhgt diverter is going
to be fitted (Pic 4-13). Apply special adhesive compound
between section and insulation sheet . Fit draught diverter
(41) onto boiler group by M8x30 setscrews (42), A8.4
washers (43) and M8 nuts (44) as shown in Pic 4-14.
Picture 4-12.
Picture 4-13. Picture 4-14.
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11. Fit pilot burner (25) onto pilot burner cover (22), and fit this group on boiler gas inlet side after placing pilot
burner insulation (21). Secure pilot burner cover to side section of boiler by 2 pieces of M5x15 sectscrews (24) and
A5.3 washers (23) as shown in Pic 4-16. Picture 4-15
Picture 4-16
12. Likewise, fit ionisation electrode (31), ionisation electrode cover (31) and insulation (28) on opposite side section
using M5x15 setscrews (30) and A5.3 washers (23).
Picture 4-17
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#
Picture 4-18
13. Fit combustion chamber base plate (34) inside the chamber
as shown in Pic 4-19.
14. Fit M12x40 studs (35) onto boiler left and right hand sections
Apply fibre-glass rope dia 10 mm supplied within accessory box
to surfaces where gas monifold is to be fitted, with help of grey
paste compound. Fit gas monifold (36) by support of above studs,
and secure it using M12 nuts (38) and A13 washers (37). Ensure
that gas manifold compresses squarely onto boiler sections and
air-tight. On gas inlet side, fit flame inspection window and its
frame using M6x20 setscrews, A6.3 washers, and M6 nuts. Picture 4-19.
Picture 4-20. Picture 4-21.
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4.3. ASSEMBLY OF BOILER INSULATION AND CASING GROU
P
1. Place M12x25 sectscrews (32) routing from fire chamber
towards to left and right hand sides. Fit side casing support
profiles (33) to items 32 via M12 nuts (19) and A13 washers
(18) as shown in Pic 4-22.
Picture 4-23
Picture 4-22
2. Wrap front insulation (48), rear insulation (52) and side
insulations (54+54) around boiler body and secure insulation
parts using galvanized wire dia 1 mm supplied with the boiler.
Feed un-insulated areas, and connect insulation parts together
using aluminum backed tape. Fit draught diverter insulation part
likewise explained above (Pic 4-23).
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285 3. Place side casings (55+55) onto support profiles (33), and
# fix them onto draught diverter using self tapping screws 4.8x9.5
(56) as shown in Pic 4-24 and 25.
Picture 4-24.
Picture 4-25.
4. Fit front inner casing (49) onto front insulation part by the
help of item 35 of gas manifold assembly, and M12 nuts (38)
and A13 washers (37). Secure front inner casing to upper
staybolt (7) using 3 pieces of fixing piece (50), and self
tapping screws ST5.5 (51) as shown in Pic 4-26.
5. Likewise fit rear inner casing (53) onto side casings (55)
by the help of self tapping screws.
Picture 4-26.
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6. Place top casing front (93) and rear (90) parts
on side casings as shown in Pic 4-27. Place front
casing upper (98) and lower (97) parts having
finished the installation of gas train.
Picture 4-27.
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