Assessments - 2, GPA: 4.5
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5. Typical Central Heating & Hot Water System Low Limit Low Limit Thermostat Gravity Flow 28mmHigh Limit Thermostat High Limit ThermostatGravity Flow 28mm Drain Cock Indirect Hot Water Cylinder Gravity Radiator Domestic Hot Water Draw Off Cold Water Tank Overflow Feed and Expansion Tank 22mm Open Vents Overflow Central Heating Flow Central Heating Return Drain Cock at Lowest Point Gravity Return 28mm Circulating PumpThermostat Using 4 Boiler Tappings Fig. 4. Typical Central Heating & Hot Water System Gravity Return (28mm Pipe) Central Heating Return Common Return to Boiler (28mm Pipe) Fig. 6. Injector Tee. Drain Cock Indirect Hot Water Cylinder Domestic Hot Water Draw Off Gravity Radiator Cold Water Tank Overflow Overflow Feed and Expansion Tank 22mm Open Vents Central Heating Return Drain Cock at Lowest Point Gravity Return 28mm Circulating Pump Injector Tee Central Heating Flow Using 3 Tappings Fig. 5. Typical Central Heating & Hot Water System Low Limit Low Limit Thermostat Gravity Flow 28mmHigh Limit Thermostat High Limit ThermostatGravity Flow 28mm inches) each side and 300mm (12 inches) above the appliance should give sufficient air circulation. If a wooden mantelpiece or beam is used in the fireplace it should be a minimum of 460mm (18 inches), and preferably 600mm (24 inches) from the appliance. In some situations it may be necessary to shield the beam or mantelpiece to protect it. CENTRAL HEATING SYSTEM The central heating system must comply with BS:5449 part 1. If the system is to be a combined heating and domestic hot water system then a double feed indirect hot water storage cylinder to BS:1556 part 1 should be used. In order to prevent the build up of scale and corrosion a suitable inhibitor should be used. The system must be correctly vented as shown in Figs. 4 and 5. The height differential between the header tank and the appliance must not exceed 15.2 metres (50 feet). If all four boiler tappings are used then, if possible, diagonal pairs should be connected for domestic hot water and central heating. Where a common return is used an injector tee must be incorporated into the system as shown in Fig. 6. This will ensure that a good domestic hot water supply is maintained when the central heating pump is operating. The system must incorporate a gravity circuit which will normally heat the domestic hot water and an unvalved radiator with an output of at least 1 kW. When the appliance is not connected to a domestic hot water system the unvalved radiator(s) on the gravity circuit must have an output of at least 1.25 kW. This is to prevent boiling in case of pump failure. All pipework in the primary circuit must be 28 mm diameter and the gravity flow pipe must rise continuously from the boiler to the open vent. Two typical systems are shown in Figures 4. and 5. Page 7 Country 8B WB 10/00 Blanking Plate Blanking Plate Clamping Plate with fold horizontal Back of the Stove Clamping plate finishes flush with inside face of firebox top and bottom. with fire cement Seal Blanking Plate Fig. 7. Flue Blanking Plate. Blanking Plate Blanking Plate Clamping Plate with fold horizontal Back of the Stove Clamping plate finishes flush with inside face of firebox top and bottom. with fire cement Seal Blanking Plate Fig. 7. Flue Blanking Plate. If the appliance is used to heat a very small central heating system then the heat output to the room from the fire will be reduced. Fig. 3. shows the ratio of space heating to water heating which can be expected. Fitting a radiator in the same room as the fire is recommended as it will allow greater flexibility in the way that the system is operated as well as ensuring that there is sufficient heat. Connect the heating system to the boiler ensuring that the primary flow pipe rises continuously from the appliance to the vent. Fill the system with water and check for leaks. SYSTEM CONTROLS Since the controls on the stove are manually operated we strongly recommend using high and low limit pipe thermostats to control the pump. The high limit, (anti-boiling,) thermostat, should be fitted on the gravity flow pipe as near to the boiler as possible, and the low limit, (anti-condensation,) thermostat should be fitted on the gravity return -again as near to the boiler as possible but ensuring that it is not on the common part of the return if only one return tapping is used. Set the high limit thermostat at 85°C and the low limit thermostat at 45°C. Radiators may be either manually or thermostatically controlled. CONNECTIONS TO FLUES There are several ways of connecting the stove to the flue. These are illustrated in Figs. 8 to 11. If the top flue connection, or the optional vertical rear flue connector, is used then chimney may be swept through the appliance. Horizontal lengths of flue must be kept to a minimum and should not be more than 150mm (6 inches) long. The sealing face of the flue collar must be coated with fire cement before fixing to the body of the stove using the two s...