Unvented hot water cylinder – SCxn…d/i, SCxn…sd/si
Page 10 of 28
ST0109 – C 05/09
WATER
5.2 Siting considerations
When choosing a suitable location for the cylinder the following aspects should be con-
sidered:
- structural integrity
- access for installation, operation, maintenance and replacement
- routing of discharge pipe work
- access to water mains supply, hot and cold water distribution pipe work
- access to suitable electricity supply
- location in relation to remaining system components such as auxiliary and solar heat-
ing system
- frost protection
The Dimplex SCxn cylinder range is designed to be floor standing, vertically mounted,
indoors and in a frost free environment. The cylinder may be located on any flat and
level surface, provided it is sufficiently robust to support the weight of the cylinder
when full of water (see chapter 10).
The position and orientation of the cylinder should be such that easy access is provided
for servicing the controls and replacing the immersion heater should the need arise.
Ensure that no pipe work hinders any work to be carried out on the various cylinder
components.
Particular care must be taken when placing the cylinder in a garage or outbuilding. All
exposed pipe work must be correctly insulated to avoid frost damage. If required the
occurrence of frost has to be avoided by means of heating the space in which the cylin-
der is located.
5.3 Cold water supply and discharge pipe work
The required operating conditions of the Dimplex SCxn cylinder range are summarised
in Figure 4. The following instructions have to be followed when installing the cold water
mains supply to the cylinder.
1 The cold water supply to the cylinder must come directly from the cold water mains
after the mains stop valve to the property.
2 The inlet group supplied with the cylinder contains a line strainer, pressure reducing
valve, pressure relief valve, check valves, balanced cold water supply port and a
connection point for the expansion vessel (required for SCxn solar only).
3 The cold water inlet pipe work should have at least an inside diameter of 19mm and
meeting the requirements of the water regulations for the supply of wholesome wa-
ter.
4 The discharge pipe work from the expansion relief valve must be installed constantly
falling to an open point of discharge. It is recommended to combine it with the dis-
charge of the temperature and pressure relief valve as illustrated in Figure 6.
When completing the installation of the discharge pipe work ensure the valve itself is
secured by tightening the screw on the side of the assembly. Loosening the screw
allows the best possible orientation of the valve.