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

R/O Shops, 9-19 Manor Green Road, Epsom, Surrey KT19 8RA

SPECIFICATION 1649-2
Craig Pointon

07/03/01
Copies / revised specifications
can be obtained via fax / email
Heat Bank Thermal Store System  
Xcel Cylinder  
Pressurised Store with Bubble  
Single Heat Exchanger (30 ltr/min)  
40mm Foam Insulation  
GX-Plan primary controls  
Underfloor Primaries  
Fitted Primary Pump, Alpha 6m  
All fitted controls are wired  
Thermostatic Blending Valve 22mm  
Backup Immersion Heater  
Low Water Level Indicator  
Cased  

 

Unit Code

 XC-150-1649-2XC-180-1649-2XC-210-1649-2

Capacity [litres]

 150180210

Base Diameter [mm]

 450450450

Overall Diameter [mm]

 530530530

Height [mm]

 133015101720

2   Plate Heat Exchanger
3   Heat Exchanger Pump
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  Flow From Boiler
20  Return to Boiler
23  Flow to Heating Circuit
24  Return from Heating Circuit
27  Primary Pump UPS 15/50
27  Primary Pump Alpha 6m
38  Cylinder Immersion Thermostat
41  Primary 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

Secondary Pump to be added to drawing in very near future.

 
The GXV Xcel a superb all-round performance system, originally designed as a compact, high output hot water and heating system for council properties. 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 pressurised GX Xcel Heat Bank Thermal Store makes use of a trapped air bubble to cater for thermal expansion of system water.  Unlike unvented cylinders that use a similar method, the bubble in the Heat Bank Thermal Store cannot be lost from the system - the system is completely sealed from both the mains and from hot water outlets.  The advantage of using a trapped bubble is it does away with fitting an external expansion vessel - better use of space, cheaper, and more reliable.  
Grundfos Alpha has automatic control, which ensures that the pump’s pressure and flow is constantly adjusted to meet current needs - summer or winter, night or day.
An old-fashioned circulation pump pumps at the same power 24 hours a day – every day.

The automatic control ensures that the pump can “talk” with the heating system’s thermostats. When the heating is turned up the pump is hard at work. When the heating is turned down the pump works correspondingly less.
The improved balance between the pressure and flow produced by the pump and the throughput allowed by the thermostats also means reduced noise.

The unit is fitted with a Mixcall III Thermostatic Blending Valve, to control the hot water temperature, and prevent scalding.  The graph shows the pressure drop across the valve for various hot water flow rates.

The Valve is adjustable from 27°C to 67°C, and has a lockable head.

The unit is fitted with one heat exchanger, capable of delivering 30 litres/minute @45°C (80°C storage). The graphs shown the domestic hot water output that can be achieved for various storage temperatures.

  

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.