STANDARD ENERGY LOSSES
The heat loss of each SCx Unvented Unit while maintaining the temperature of the stored water at 65 degrees Celsius. (See performance table below).
1)Tests carried out by BBA. Slight variations may occur with changes to water mains supply pressure
SCx Performance
Nominal |
| Heat up |
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| Heat up |
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| Reheat |
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| Reheat |
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| Heat loss in |
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Capacity |
| Model IDH |
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| Model DH |
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| Model IDH |
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| Model DH |
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| 24 hrs |
Litres |
| Mins |
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| Mins |
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| Mins |
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| Mins |
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| kw/hr |
80 |
| 33 |
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| 64 |
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| 23 |
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| 53 |
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| 1.12 |
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130 |
| 28 |
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| 115 |
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| 21 |
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| 90 |
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| 1.50 |
150 |
| 33 |
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| 138 |
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| 24 |
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| 104 |
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| 1.82 |
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175 |
| 27 |
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| 167 |
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| 24 |
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| 124 |
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| 2.10 |
215 |
| 35 |
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| 212 |
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| 30 |
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| 153 |
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| 2.64 |
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255 |
| 42 |
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| 263 |
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| 35 |
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| 184 |
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| 2.73 |
305 |
| 50 |
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| 313 |
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| 42 |
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| 220 |
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| 2.88 |
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2)These figures relate to a 45 degree differential between the stored water and ambient temperature
WITH AN SCx UNVENTED CYLINDER THE FOLLOWING IS SUPPLIED AS STANDARD
●1 Element on IDH indirect models up to 305 litres and 80 litre DH direct model
●2 Elements on DH direct models from 130 up to 305 litres. Additional elements from 215 to 305 litres are available on request.
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●Expansion relief valve with non return valve set at 6 bar
●Tundish 15mm x 22mm F x F
●Temperature / Pressure relief valve set at 90 degrees Celsius and 7 bar pressure relief (factory fitted)
●Motorised valve (indirect units only)
●Cylinder
●Thermal cut out set to operate at 87 degrees Celsius plus or minus 3 degrees (indirect units only)
●Option – Expansion vessel with capacity as below: -
CONNECTING THE WATER SUPPLY
●Pipework is not supplied
●All pipework should be installed using good plumbing practice. We recommend 22mm mains cold water supply is used.
●Install a Stop Cock Valve before the cold water inlet assembly on the incoming mains water supply so the unit can be isolated if required.
COLD WATER VALVE
The combined cold water valve (supplied) can be connected anywhere on the cold water mains prior to the unit. It can even be located at a point near to where the mains supply enters the premises if this is more convenient. When installing the cold water valve, ensure that the arrow is pointing in the same direction as the mains water supply flow when connecting, see fig 2.
The cold water balancing port, on the valve, allows you to connect the cold water mains to the rest of the property thus giving balanced pressure throughout. If this facility is not required leave the cap on.
DRAIN TAP
A drain tap to drain the unit must be fitted to the
PIPEWORK TO TAPS
Ideally a 22mm pipe run should supply the outlets throughout the property with short lengths (max 1 metre) runs of 15mm going to baths, showers, and basin taps. Smaller bore pipe can be used to suit taps.
SECONDARY CIRCULATION
This is particularly easy to fit on the SCx units; a Swept Tee (not supplied) is needed for all indirect models if secondary circulation is required, see page 6 fig. 3 for fitting. A
Before commencing installation check that all the components of your SCx Unit are contained in the kit.
●3KW Incoloy 825 heating
Tank Size | Expansion Tank Required |
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80 to 130 Litres | 12 Litres |
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150 to 215 Litres | 18 Litres |
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255 to 305 Litres | 25 Litres |
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Typical Indirect Tank installation using external expansion vessel option
| WATER FLOW |
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| HOT WATER OUTLET |
| Fig.1 |
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| 7 BAR / 90 DEGREES | EXPANSION VESSEL |
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| PRESSURE & | |
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| TEMPERATURE |
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| RELIEF VALVE. |
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WATER FLOW |
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TO COIL INLET | PRIMARY FLOW |
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SCx UNVENTED INSTALLATION INSTRUCTIONS
WARNING: Under no circumstances must the factory fitted temperature pressure relief valve be removed. This will totally invalidate any guarantee or claim. The
DO NOT ATTEMPT TO VENT THE PRIMARY CIRCUIT THROUGH THE SCx UNIT.
All boilers should be installed to manufacturers instructions and the primary circuit through the SCx unit must be pumped.
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| TUNDISH |
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| WATER FLOW TO | |
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| PRIMARY RETURN |
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| MANIFOLD VIA | |
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| FLEXIBLE HOSE | ||
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WATER FLOW | TWIN | SECONDARY |
| 6 BAR | PRESSURE |
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FROM COIL INLET | THERMOSTAT |
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RETURN FLOW |
| REDUCING VALVE | ||||||
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| EXPANSION | |||||
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| SET AT 3 BAR | ||||
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| RELIEF | ||||
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| WATER FLOW |
| VALVE |
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| IMMERSION | TO OVERFLOW |
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| HEATER | WATER INLET |
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| WATER FLOW |
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| SWEPT TEE |
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| INLET SIDE OF TANK | |
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| DRAIN |
| WATER FLOW | BLANKED | |||
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| COCK |
| FROM EXPANSION | ||||
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| PORT | |||||
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| TANK TO 22MM | ||||
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| FEMALE THREAD |
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SITING THE SCx UNIT
The unit can be placed anywhere convenient. Because it is connected directly to the mains water supply it is equally efficient on any floor – ground, first or second. Avoid areas that may be subject to frost. Try to keep pipe runs as short as possible for maximum economy, especially hot water discharge pipes running down from the SCx unit.
The unit can be fitted into a conventional airing cupboard and does not require any additional insulation.
ALL SCx UNITS MUST BE STORED VERTICALLY
CHECK WATER PRESSURE & FLOW RATES
We suggest 1.5 bar pressure & 15 litres / minute flow rate to be the minimum requirements for satisfactory operation. Less than this the unit will still operate but you will not be able to run two, or more, outlets at the same time. 85% of all U.K homes have more than
The mains supply must not exceed 16 bar. If it does a special
Important Note: - Stainless Steel Tectile push fit elbows are fitted as standard to all SCx Cylinders.
Cold water inlet valve assembly |
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| BEHIND COVER |
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| BALANCED | |||
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| COLD WATER | |||
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| OUTLET | ||
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| 6 BAR | |||
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| EXPANSION |
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| RELIEF |
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| VALVE | |||
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| PRESSURE REDUCING VALVE SET |
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| AT 3 BAR Fig.2 |
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WATER FLOW INLET SIDE OF TANK
WATER FLOW FROM EXPANSION |
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TANK TO 22MM FEMALE THREAD BEHIND | BLANKED |
COVER | PORT |
4 | 5 |