Page 1: Table Of Contents
SY6425900 7/2/05 9:12 am Page 1 INSTRUCTIONS DFB - Cisternless Rectangular Waterheater with Thermostatic Blender Models DFB25, 50 & 75 Contents Introduction Taking delivery Technical speciﬁcation Selection guide Wall mounting Cold water supply Pipework design Electrical connections Commissioning Trouble shooting Routine maintenance Servicing Spares list...
Page 2: Introduction
22mm copper outlet pipe Brass blender outlet boss Should anything be missing please contact our Customer Services department. Technical Speciﬁcation Storage Volume DFB 25 - 25 litres DFB 50 - 50 litres DFB 75 - 75 litres Element Incoloy sheathed, Rated 3.0 kW @ 240 V ac ~...
Page 3 E.M.C. Complies with all applicable European directives. Approvals WRAS Approval number 9803067 Manufactured in a BS EN ISO 9002 registered factory. Dimensions (mm) Unit Height Width Depth Weight Weight (Empty) (Full) & Weight (kg) DFB 25 DFB 50 DFB 75...
Page 4: Selection Guide
Frequency Unit Volume Flow rate Flow rate number of of use above 40°C @ 1.5m head @ 2.0m head basins DFB 25 40 litres 10 l/m 12 l/m 4 - 5 light DFB 50 70 litres 10 l/m 12 l/m...
Page 5: Cold Water Supply
SY6425900 7/2/05 9:12 am Page 5 Cold Water Supply The water supply must come from a potable source. This is usually direct from the cold main but may be via a header tank with a minimum static head of 5m. The heater as supplied is suitable for incoming water pressures between 0.5 and 7 bar.
Page 6 SY6425900 7/2/05 9:12 am Page 6 No isolator need be ﬁtted in the outlet pipe from the DFB. A simple method of isolating the outlet pipework without draining the DFB is outlined in section 12 - Servicing. In order to present the minimum resistance to ﬂow we recommend that the outlet pipework be 22mm for as much of its length as possible.
Page 7: Electrical Connections
SY6425900 7/2/05 9:12 am Page 7 Electrical Connections Ensure that mains electricity supply is ‘off’ before commencing electrical installation. This appliance must be earthed. It is the installer’s responsibility to ensure that all pipe work to and from the appliance is earth bonded to other service pipes in the vicinity. In the UK the installation must conform to the I.E.E.
Page 8: Commissioning
Turn on the electrical supply. Filling takes place automatically. A green neon will light indicating that the unit is ﬁlling. Typical Filling times: DFB 25 - 3 minutes DFB 50 - 6 minutes DFB 75 - 9 minutes When the unit is full and the green light is extinguished the commissioning switch should be put into the heating position.
Page 9: Troubleshooting
SY6425900 7/2/05 9:12 am Page 9 Troubleshooting Water from taps is cold. Unit has power but is not heating. Remove grey cover. Is the commissioning switch in Switch to heating position. the heating position? If unit still does not heat, Is red heating neon lit? check element for open circuit.
Page 10 SY6425900 7/2/05 9:12 am Page 10 Unit won’t ﬁll - Check solenoid valve for failure in closed position. This is usually caused by an open circuit coil. This can be detected by removing the wires to the solenoid and checking for continuity across the two terminals. An open circuit coil has no continuity. No water ﬂow - The most common reasons are a lack of power or water.
Page 11: Servicing
SY6425900 7/2/05 9:12 am Page 11 Annual maintenance We recommend that the following routine maintenance be carried out each year: Disconnect the blender/pressure reducing valve/solenoid assembly. Dismantle carefully and clean, paying particular attention to the following areas. • The blender internals (see previous section for cleaning details). •...
Page 12: Spares List
This Guarantee in no way affects the statutory rights of the consumer. The policy of Santon is one of continuous product development and, as such, we reserve the right to change speciﬁcations without notice.

This manual is also suitable for:

Dfb 50 Dfb 75 Dfb series