Product Information
Using 30 years of experience, Ramki will tailor your central heating system to ensure that you will have the most efficient system, to suit your needs, at the right cost. The system should use no more fuel than necessary and always have the house at the temperature you desire. It should also provide all the hot water you need, when you need it. A carefully designed and installed system will give you many years of trouble free running and will not waste heat, therefore keeping fuel costs low.
Systems
Open Vented System
This is usually on older systems and cast iron boilers. This means that there is an “Expansion Tank” fitted high up, which feeds the water down the “Cold Feed” into the central heating system. This is usually fitted in the loft next to the storage tank.
Sealed System
Instead of using a tank and an expansion pipe, sealed systems use an “Expansion Vessel”, a “Safety Blow Off Valve” and a “Filling Loop”. Most modern systems use this method because it is easier to install and has less tendency of problems developing in the system at a later date.
Boilers
The size of the boiler should be matched to the size of the property. If the boiler is oversized, then the fuel bills will be excessive. If the boiler is undersized, it may not generate enough heat in winter. The ideal size for a boiler is one that copes adequately on the coldest day of the year. Most boilers are oversized by at least 30%.
Combination Boilers
These boilers provide both instant hot water and central heating, but not at the same time. They are hot water priority which means when hot water is being run there is no heat output to the radiators. These boilers are ideal in smaller homes where space is at a premium or where the demand for hot water is not too great. These are not recommended for houses with more than one bathroom due to the hot water flow rate which can only feed one tap at a time.
Condensing Boilers
These are high efficiency boilers that waste very little heat. They also have a condensation drain as well as a flue to let the condensation out. As from 1st April 2005 al new boilers in England & Wales must be over 90% efficient. If you’re looking to be environmentally friendly, then this is the type of boiler you are looking for.
System Boilers
These boilers are built with an expansion vessel and a circulating pump, which allows for a lot tidier installation.
Radiators
There is a large choice of radiator styles like Ladder radiators, Hospital radiators, Towel warmers, Kick space radiators, Skirting heaters and Fan assisted radiators. It doesn’t’t matter which type you choose providing the heat output of the radiator(s) meets the needs of the room.
The best place for every radiator is in the coldest part of the room, which is usually under a window.
How to Bleed Radiators
- Make sure that the CH (Central Heating) is in the off position
- Place your bleed key on the bleed nipple (this will be at the top, at one side only and could even be at the back, but usually is at one end)
- Turn the bleed key 1/2 a turn anti clockwise to open (you should here the air hissing)
- When water starts to dribble out turn the key 1/2 a turn clockwise to shut it off (Do Not Over Tighten)
If you have a sealed system then the pressure will probably need topping up to 1 bar.
Cylinders
Most of the cylinders we supply are indirect, which means water from the central heating goes through a coil within the cylinder giving its heat up to the water within the cylinder. These are used for most types of central heating systems.
Copper Vented Cylinders
Vented cylinders are fed by a over head storage tank, and when heated disperses any expansion through a vent pipe.
We have designed and created our own high efficiency cylinder to benefit our customers and our installers. They come with thicker foam lagging bonded on to the outside, which will keep the water hotter for a longer time. They have larger inner coils to improve hot water recovery time and all connections on one side to save space and make it easier to install.
They come in various different shapes and sizes to suit the space available, and the capacity of water that is required.
All our cylinders also come with an electric emersion heater, which is used as a back up to heat the water up if the boiler was to break down.
Unvented Cylinder
A unvented cylinder is connected directly to the main water supply giving mains water pressure to the hot taps and showers. This is probably the future standard because of the reliability and true mains water pressure and when fitted with a low water content boiler are very cheap to run.
Controls
This is the area that separates Ramki Heating from the rest. The 30 years experience helps us to create a reliable and efficient system, by using a suitable combination of controls.
Controls are the most important part of any central heating system. A central heating system is only as good as its controls, the better the controls, the less wear and tear on the boiler and system.
The right controls can create the right living environment. To be able to control both water and room temperature, will make the home feel a great deal more comfortable.
Programmer
Programmer will switch one, two or even three different circuits on or off at different times or even on different days. Most programmers have integral switches to set them up to your own personal preferences, for example, to have the hot water and heating to come on separately at a different time each day of the week. A programmer should be set to cover all the times that the property is occupied. A signal is sent out to the cylinder and room thermostats and these will keep everything at the desired temperatures.
Cylinder Thermostat
A cylinder thermostat is attached to the side of the cylinder to control the water temperature, this should be set to about 55-60 deg °C. When the water is demanded, the thermostat will turn the boiler on and off to keep the water at the set temperature.
Room Thermostat
All central heating systems should have a room stat fitted, this will shut the heating circuit on and off to maintain the room at the desired temperature.
Since April 2002 it is mandatory as part of the building regulations that all new and updated systems have a room thermostat fitted.
Note the radiator must not have a TRV fitted in the same room as this can stop the Room thermostat working correctly.
Programmable Room Thermostat
This can program different temperatures for different times of the day and night.
Frost Thermostat
The purpose of this is to stop the boiler or exposed parts of the system freezing in winter. This is the same as a room thermostat ex
