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Unvented system - schematic diagram
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Note: Indirect twin coil unit shown.
© Baxi Heating UK 2012
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5.0
Cylinder specifications
5.1
Unvented
Nominal capacities 210, 250 and 300 litre.
Rating Immersion heater(s) 1 x 3 kW (indirect models),
2 x 3kW (direct models) @ 240V~.
Outer casing White plastic coated corrosion proofed steel.
Thermal insulation CFC/HCFC-free (ODP zero) flame-
retardant expanded polyurethane (60mm thick). GWP 3.1
(Global Warming Potential).
Cylinder Duplex stainless steel.
Pressure testing To 15 bar.
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Heat unit Titanium
element/s, incorporated into an easily removable heater plate,
should replacement be necessary. Rated 3.0kW @ 240V~.
Primary coil (for Auxiliary boiler heating) 22mm
diameter stainless steel. Coil in coil design for improved
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performance
Solar coil 25mm diameter stainless steel. Coil in coil design
and large surface area for improved performance.
Thermostat
Direct models: Element thermostat adjustable from 10°C to
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70°C.
Indirect models: Factory-fitted cylinder thermostat adjustable
to 70°C.
Fig. 7
Solar: Factory fitted control pocket suitable for
insertion of solar controller temperature probe.
Factory fitted safety features:
Direct models: Manually re-settable cut-out on heating
element operates at 85°C.
Indirect models: High limit thermal cut-out operates at 85°C.
Wired in series with two-port motorised valve (supplied) to
provide primary over temperature protection when using
auxiliary (boiler) coil.
All models: Temperature and Pressure Relief Valve,
factory set to operate at 10 bar and 90°C.
High limit thermal cut-out operating at 85°C at solar coil
position. Wired in series with the solar differential temperature
controller to provide over temperature protection if
overheating occurs from solar collector panels.
N.B. This must be used in an unvented installation to comply
with the requirements of Building Regulation G3.
Anode Not required.
For full technical and performance specification see
cylinder installation instructions.
The cylinders are unvented so installation must comply with
Building Regulation G3 and / or other local regulatory
requirements.
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