DEDICATED PRESSURE SYSTEMS LTD.

Telephone 01372 803 675
 Fax 01372 803 678
 Email dps@heatweb.com
 Internet http://www.heatweb.com

The Institute of Plumbing

 9-19 Manor Green Road, Epsom, Surrey KT19 8RA

Specification 4029-1
Xcel Heat Bank Thermal Store, Sealed GX-Underfloor

09/08/01
Copies / revised specifications
can be obtained via fax / email
Heat Bank Thermal Store System  
Pressurised Xcel GX Cylinder  
28 Plate Heat Exchanger (45+ ltr/min)  
40mm Foam Insulation  
Danfoss VMV20 GX Control Valve  
Underfloor Primaries  
35mm Heating using UPS25-55  
Fitted Primary Pumps 
All fitted controls are wired  
Backup Immersion Heater  
Cased  

 

Unit Code

 XC-250-4029-1

Capacity [litres]

 250

Base Diameter [mm]

 450

Overall Diameter [mm]

 530

Height [mm]

 1980 + 80

2   Plate Heat Exchanger  L18-28
3   Heat Exchanger Pump UPS 15/60
4   Flow Switch
7   Automatic Air Vent
9   Store Filling Point
11  Y-Pattern Strainer (supplied loose)
14  Immersion Heater 3kW Incaloy with Stat
16  Cold Mains In, 22mm
17  Hot Mains Out, 22mm
18  Drain Cock
19  Return from Boiler, 28mm
20  Flow to Boiler, 28mm
23  Flow to Radiator Circuit, 35mm
24  Return from Radiator Circuit, 35mm
25  Flow to Underfloor Circuit, 22mm
26  Return from Underfloor Circuit, 22mm
27  Boiler Pump UPS 15/60
28  Radiator Pump UPS 25/55
29  Underfloor Pump UPS 15/60
30  Boiler Return VMV20 Blending Valve
38  Cylinder Thermostat (with Immersion Pocket)
42  Underfloor Blending Valve
42  Wiring Centre
54  Filling Loop (disconnect after use)
55  Water Level Switch
77  Pressure Limiting Valve, 1 Bar
78  Pressure and Temperature Gauge
79  Pressure + Temp Relief Valve +Tundish 2.5 bar


 
IMPORTANT: A primary expansion vessel of at least 36 litres capacity, and with a 1 bar pre-charge pressure, must be connected to the return from the radiator circuit.  There must be no valves, either manual or automatic, between the store and the vessel.
To obtain 100% useful input from the boiler, the store is heated directly by the boiler - no coils. The main advantages of the system are...
No Motorised Valves for either hot water or heating - more reliable & easier to service.
Very rapid recovery of store - hot water in under 3 minutes from cold.
Large volumes of hot water from a small store.
Maintains condensing boilers in condensing mode. 
Ability to bring central heating up to temperature extremely quickly (store recovered).
Store acts as an ideal air separator.
The unit is fitted a 28 plate heat exchanger, and is capable of delivering 45 litres/minute @45°C (80°C storage).
A Mains Water Isolating Lever Valve must be fitted within the cylinder cupboard, in clear view and easily accessible. A Strainer (supplied loose) must also be fitted, down stream of the isolating valve, to protect the flow switch [4].
It is advised that the mains water is tested for hardness. In areas of hard water, we advise the use of a scale inhibitor.
It is important that SENTINEL X100 Inhibitor is used to protect the Heat Bank Thermal Store.  Use 1 litre per 100 litres of stored water. A suitable anti-freeze, such as X500, should also be added when there is a chance that the unit will be left filled and unheated in freezing conditions.