S-1 — المواصفات العامة للتركيبات الكهربائية
K سخانات المياه
الصفحة 46 في الوثيقة الأصلية
عرض PDFK. ELECTRICAL WATER HEATER:
K.1 GENERAL:
K.1.1 Electric storage type water heaters shall generally be either of the vented and open to the
atmosphere so that under no condition of use the pressure at the surface of the water be other
than atmospheric, or of the cistern type in which the feed cistern is an integral part of the
appliance or a separate part located immediately above the water heater. All water heaters shall
be provided with thermostats unless otherwise specified for temperature regulation of the both
water and to prevent excessive rise in temperature
K.1.2 Where pressurized circulating hot water system is required M.E.W. recommends to install
central pressurized water boiler of reputed manufacturer and the safety precautions shall be
carried out as per the manufacturer's recommendation an d instructions, but not less than the
following minimum requirements.
I. Temperature and pressure relief valve factory provided.
II. Manual staging thermostat for each element.
III. Safety temperature limiter to disconnect the power supply in the event of wate r
temperature exceeds 90ºC.
Where individual hot water heaters are installed in pressurized water system the following
conditions and safety precautions shall be fulfilled.
I. Each individual heater shall be provided with the following:-
a) Adjustable automatic thermostat of 20 amps. min. rating for temperature regulation.
b) Non-adjustable safety temperature limiter (Energy shut off device) to protect the heater
from overheating and disconnect the electrical supply if the water temperature exceeds
90ºC .
c) Temperature relief valve of reputed manufacturer.
d) Pressure relief valve of reputed manufacturer.
N.B.: Combined temp. & press. relief valves can be accepted
II. Adequate water filtration system shall be provided, (preferably sand Fil ters) water treatment is
recommended in addition to filtration.
III. All water piping (Pipes, Fittings, Joints etc.,) cold and hot shall be copper.
IV Heaters shall be installed in a safe ventilated location where it can be easily maintained and
seen.
V. When replacing any water heater the new water heater must be provided with the same safety
precaution devices mentioned above. Furthermore a warning instruction to this effect shall be
written on the boiler.
VI. The technical information and declaration sheet Appendix (1) shall be filled and signed by the
owner, and shall be submitted with the test form for inspection.
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K.2 VENTED TYPE STORAGE WATER HEATERS
The water heaters shall be electric, thermal storage low and medium pressure type as described
hereunder and manufactured by a reputable manufacturer, and shall comply with Kuwaiti
Standard Specifications KSS 40-1973.
K.2.1 Construction:
K.2.1.1 The designed working pressure of the low pressure inner container shall be 1.8 KG/CM² and the
test pressure shall be 3.6KG/CM². The designed working pressure of the medium pressure inner
container shall be 3.6 KG/CM2 and the test pressure shall be 7.2 KG/CM2.
K.2.1.2 The unit shall generally consist of a cylindrical inner container constructed ei ther of cold rolled
copper sheet tinned internally with all seams over lapped and brazed, or copper sheet tinned
internally and enveloped in a cylindrical sheet steel envelope contiguous to copper container.
K.2.1.3 The outer casing shall be made of high grade sheet steel, rust proof with two coats of anti -rust
paint inside and outside and finished in white baked on hard wearing enamel, Space between
inner and outer container shall be padded with efficient thermal lagging.
K.2.1.4 The unit shall be provided with P.S.P.T. connections for cold water inlet, hot water outlet, and
with drainage device. Inlet pipe shall enter the container from bottom and outlet pipe can be
from bottom or top. The arrangement of inlet and outlet pipe inside the container shall not
permit emptying the container or water under any condition except through the drain connection
which shall be in the lowest bottom and provided with drain valve and extended nipple for loose
connection (Fig. 2).
K.2.I.5 Each unit shall be equipped with the following:-
a) Immersion heating element
b) Adjustable automatic thermostat
c) Safety temperature limiter
d) Indication light
K.2.2 Installation:
K.2.2.1 The unit shall not be connected directly to water mains or through any water network having
pressure regulating system.
K.2.2.2 The unit shall be fed from an elevated storage feed tank and a vent or expansion pipe from the
top of the inner container shall be provided for each unit to discharge water freely to the elevated
feed tank as shown in the attached figure (1) and recommended by the manufacturer.
K.2.2.3 No valves shall be installed between the discharge of the unit and the vent pipe.
K.2.2.4 The maximum height of the elevated tank feeding the low pressure unit shall be 18 metres and
36 metres for the medium pressure unit.
K.2.3 Immersion Heating Element:
K.2.3.1 The immersion heating element shall be constructed from nickel chromium resistance wire
sheathed in a mineral filling, the whole being cased in a copper tube sealed against moisture.
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K.2.3.2 The immersion heating element shall be provided with cover terminals and shall be screwed or
flanged to the inner container from outside the vessel. The heating element shall be easily
removable for servicing; also it shall be possible to remove the elemen t plate assembled
completely for descaling. The immersion heater shall satisfactorily pass all high voltage tests.
K.2.3.3 Immersion heater and terminal block shall have a substantial earth terminal connected to the
inner container and outer casing. All exposed metal parts which in the event of failure of
insulation could become a live shall be ineffective electrical contact with earth terminal.
The loading of the heater shall be 3 KW Heaters shall be suitable for single phase, 240 Volts,
50HZ.
K.2.4 Thermostat:
K.2.4.1 The adjustable automatic thermostat shall be of 20 Amps. minimum rating for temperature
regulation from 32°C -85°C.
K.2.4.2 The thermostat shall be of high grade and shall be factory internally wired and shall be
removable for servicing or replacements.
K.2.5 Safety Temperature Limiter:
The safety temperature limiter shall be non -adjustable and of high grade to protect the heater
from overheating and consequently should disconnect the water heater from the electricity
supply in the e vent of water temperature exceeding 90ºC. The temperature limiter shall be
factory internally wired, and shall be removable for servicing or replacement.
K.2.6 Indication Light
The unit shall have an indicator light which, when on, shows that the appliance is in the heating
phase, it turns off when the water in the tank reached the desired temperature.
K.2.7 Capacity and Mounting of the Unit:
The capacity of the storage water tank shall be 80 or 150 lit res and shall be suitable f or wall
mounting with standard wall brackets, nuts and bolts supplied by the unit manufacturer, and
mounting arrangement shall be approved by the Engineer before installation.
K.2.8 Elevated Feed Tank:
Elevated feed tank shall be supplied and installed complete with float valve, vent pipe, valved
inlet connections to city mains, outlet connections to the water heater, valved drain connection
and an overflow connected together and run to the nearest visible drain approved by the
Engineer.
Tank shall be of approved moulded fiber glass or approved material of suitable shape mounted
over concrete saddle. The float valve shall be suitable for 6 atmospheres working pressure. Tank
size shall be 250 litres capacity.
All as shown in the attached installation guide figure (1) & (2).
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49
50
APPENDEX (l)
TECHNICAL INFORMATION & DECLARATION
The following technical information and declaration shall be filled and attached to the test application, to fulfil the
M.E.W. Regulations otherwise the Boilers installations shall not be accepted.
Project Name: File No.
Area: Block: Plot:
Total quantity of heaters....................................... .heater
1. Water Heater:
Make:
2. Safety Devices:
Capacity: Working Pressure: Bar.
Press relief valve make: Operating Press: Bar:
Temp. relief valve make: Operating Temp.: oc.
Adjustable thermostat provided Yes/No
Safety temperature limiter provided Yes/No
3. Filtration system provided Yes/No
4. Water treatment System provided Yes/No
5. Copper pipes & fittings used Yes/No
We/I declare that
A) The above mentioned items are correctly installed
B) When replacing any water heater, the new one shall be provided with all the above mentioned safety
devices.
C) The necessary maintenance will be carried out in order to assure their adequate functions
Name ……………………………………………………………………………………………………
Address: ………………………………………………………………………………………………………………………………………………………………………………………...
Signature:.....................................................................................................
Date: ...........................................................................................................
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K.1 GENERAL:
K.1.1 Electric storage type water heaters shall generally be either of the vented and open to the
atmosphere so that under no condition of use the pressure at the surface of the water be other
than atmospheric, or of the cistern type in which the feed cistern is an integral part of the
appliance or a separate part located immediately above the water heater. All water heaters shall
be provided with thermostats unless otherwise specified for temperature regulation of the both
water and to prevent excessive rise in temperature
K.1.2 Where pressurized circulating hot water system is required M.E.W. recommends to install
central pressurized water boiler of reputed manufacturer and the safety precautions shall be
carried out as per the manufacturer's recommendation an d instructions, but not less than the
following minimum requirements.
I. Temperature and pressure relief valve factory provided.
II. Manual staging thermostat for each element.
III. Safety temperature limiter to disconnect the power supply in the event of wate r
temperature exceeds 90ºC.
Where individual hot water heaters are installed in pressurized water system the following
conditions and safety precautions shall be fulfilled.
I. Each individual heater shall be provided with the following:-
a) Adjustable automatic thermostat of 20 amps. min. rating for temperature regulation.
b) Non-adjustable safety temperature limiter (Energy shut off device) to protect the heater
from overheating and disconnect the electrical supply if the water temperature exceeds
90ºC .
c) Temperature relief valve of reputed manufacturer.
d) Pressure relief valve of reputed manufacturer.
N.B.: Combined temp. & press. relief valves can be accepted
II. Adequate water filtration system shall be provided, (preferably sand Fil ters) water treatment is
recommended in addition to filtration.
III. All water piping (Pipes, Fittings, Joints etc.,) cold and hot shall be copper.
IV Heaters shall be installed in a safe ventilated location where it can be easily maintained and
seen.
V. When replacing any water heater the new water heater must be provided with the same safety
precaution devices mentioned above. Furthermore a warning instruction to this effect shall be
written on the boiler.
VI. The technical information and declaration sheet Appendix (1) shall be filled and signed by the
owner, and shall be submitted with the test form for inspection.
46
K.2 VENTED TYPE STORAGE WATER HEATERS
The water heaters shall be electric, thermal storage low and medium pressure type as described
hereunder and manufactured by a reputable manufacturer, and shall comply with Kuwaiti
Standard Specifications KSS 40-1973.
K.2.1 Construction:
K.2.1.1 The designed working pressure of the low pressure inner container shall be 1.8 KG/CM² and the
test pressure shall be 3.6KG/CM². The designed working pressure of the medium pressure inner
container shall be 3.6 KG/CM2 and the test pressure shall be 7.2 KG/CM2.
K.2.1.2 The unit shall generally consist of a cylindrical inner container constructed ei ther of cold rolled
copper sheet tinned internally with all seams over lapped and brazed, or copper sheet tinned
internally and enveloped in a cylindrical sheet steel envelope contiguous to copper container.
K.2.1.3 The outer casing shall be made of high grade sheet steel, rust proof with two coats of anti -rust
paint inside and outside and finished in white baked on hard wearing enamel, Space between
inner and outer container shall be padded with efficient thermal lagging.
K.2.1.4 The unit shall be provided with P.S.P.T. connections for cold water inlet, hot water outlet, and
with drainage device. Inlet pipe shall enter the container from bottom and outlet pipe can be
from bottom or top. The arrangement of inlet and outlet pipe inside the container shall not
permit emptying the container or water under any condition except through the drain connection
which shall be in the lowest bottom and provided with drain valve and extended nipple for loose
connection (Fig. 2).
K.2.I.5 Each unit shall be equipped with the following:-
a) Immersion heating element
b) Adjustable automatic thermostat
c) Safety temperature limiter
d) Indication light
K.2.2 Installation:
K.2.2.1 The unit shall not be connected directly to water mains or through any water network having
pressure regulating system.
K.2.2.2 The unit shall be fed from an elevated storage feed tank and a vent or expansion pipe from the
top of the inner container shall be provided for each unit to discharge water freely to the elevated
feed tank as shown in the attached figure (1) and recommended by the manufacturer.
K.2.2.3 No valves shall be installed between the discharge of the unit and the vent pipe.
K.2.2.4 The maximum height of the elevated tank feeding the low pressure unit shall be 18 metres and
36 metres for the medium pressure unit.
K.2.3 Immersion Heating Element:
K.2.3.1 The immersion heating element shall be constructed from nickel chromium resistance wire
sheathed in a mineral filling, the whole being cased in a copper tube sealed against moisture.
47
K.2.3.2 The immersion heating element shall be provided with cover terminals and shall be screwed or
flanged to the inner container from outside the vessel. The heating element shall be easily
removable for servicing; also it shall be possible to remove the elemen t plate assembled
completely for descaling. The immersion heater shall satisfactorily pass all high voltage tests.
K.2.3.3 Immersion heater and terminal block shall have a substantial earth terminal connected to the
inner container and outer casing. All exposed metal parts which in the event of failure of
insulation could become a live shall be ineffective electrical contact with earth terminal.
The loading of the heater shall be 3 KW Heaters shall be suitable for single phase, 240 Volts,
50HZ.
K.2.4 Thermostat:
K.2.4.1 The adjustable automatic thermostat shall be of 20 Amps. minimum rating for temperature
regulation from 32°C -85°C.
K.2.4.2 The thermostat shall be of high grade and shall be factory internally wired and shall be
removable for servicing or replacements.
K.2.5 Safety Temperature Limiter:
The safety temperature limiter shall be non -adjustable and of high grade to protect the heater
from overheating and consequently should disconnect the water heater from the electricity
supply in the e vent of water temperature exceeding 90ºC. The temperature limiter shall be
factory internally wired, and shall be removable for servicing or replacement.
K.2.6 Indication Light
The unit shall have an indicator light which, when on, shows that the appliance is in the heating
phase, it turns off when the water in the tank reached the desired temperature.
K.2.7 Capacity and Mounting of the Unit:
The capacity of the storage water tank shall be 80 or 150 lit res and shall be suitable f or wall
mounting with standard wall brackets, nuts and bolts supplied by the unit manufacturer, and
mounting arrangement shall be approved by the Engineer before installation.
K.2.8 Elevated Feed Tank:
Elevated feed tank shall be supplied and installed complete with float valve, vent pipe, valved
inlet connections to city mains, outlet connections to the water heater, valved drain connection
and an overflow connected together and run to the nearest visible drain approved by the
Engineer.
Tank shall be of approved moulded fiber glass or approved material of suitable shape mounted
over concrete saddle. The float valve shall be suitable for 6 atmospheres working pressure. Tank
size shall be 250 litres capacity.
All as shown in the attached installation guide figure (1) & (2).
48
49
50
APPENDEX (l)
TECHNICAL INFORMATION & DECLARATION
The following technical information and declaration shall be filled and attached to the test application, to fulfil the
M.E.W. Regulations otherwise the Boilers installations shall not be accepted.
Project Name: File No.
Area: Block: Plot:
Total quantity of heaters....................................... .heater
1. Water Heater:
Make:
2. Safety Devices:
Capacity: Working Pressure: Bar.
Press relief valve make: Operating Press: Bar:
Temp. relief valve make: Operating Temp.: oc.
Adjustable thermostat provided Yes/No
Safety temperature limiter provided Yes/No
3. Filtration system provided Yes/No
4. Water treatment System provided Yes/No
5. Copper pipes & fittings used Yes/No
We/I declare that
A) The above mentioned items are correctly installed
B) When replacing any water heater, the new one shall be provided with all the above mentioned safety
devices.
C) The necessary maintenance will be carried out in order to assure their adequate functions
Name ……………………………………………………………………………………………………
Address: ………………………………………………………………………………………………………………………………………………………………………………………...
Signature:.....................................................................................................
Date: ...........................................................................................................
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