Dimplex Unvented Water Heater - Manual (Page 6)

10
PROBLEM SOLVING
No water in tap from the SCx Unit
Check that mains supply is on.
Check that the line strainer is not blocked
Check that the combination valve has been fitted so that the
arrow on it faces in the direction of the water flow.
If the water at the hot tap is cold
Boiler (indirect): Ensure that the boiler has been switched on
and working correctly.
Check that no air blocks have occurred in the primary system
Check the following are all connected correctly
Cylinder Stat
Thermal cut out (Reset by pushing red button)
Motorised valve
Boiler thermostat (max setting 82 degrees Celsius)
Boiler thermal cut out (if fitted)(Reset by pushing red button)
Direct (Electric) Models
WARNING : Isolate unit at main electric supply before opening
heating element cover.
Ensure that power is available to the element from the electric
mains and that the isolator is on. If there is power to the
element and the element fails to operate check as follows:
Check that the thermal cut out on the elements have not
operated. If they have, reset by pressing the red button. If they
cut out again as the water heats up the cylinder thermostat
has failed and needs replacing. Fit a new thermostat and
reset the thermal cut out.
With power on and the thermal cut out reset check the output
terminal on the thermostat. If the circuit cannot be
completed, the thermostat and/or cut out needs replacing.
Check current amps drawn by the heater, should be approx.
15 amps. If heating element fails to operate, change the
complete heating element assembly.
Important. In the event of an over heat situation reset all
thermal cutouts.
If hot water discharges from Tundish
WARNING : Do not turn the mains water supply off - switch off
(1) power to immersion heaters (Direct) or (2) shut down
heating boiler (Indirect)
If hot water discharges from the tundish on indirect models there
could be a fault with the thermal cut out, cylinder thermostat or
temperature pressure relief valve. On a direct model the fault
could lie with the heating element thermostat. We recommend
you call your installer or Dimplex Service Agent.
SPARES
When ordering replacement parts the serial number on the
unit should be quoted.
PART/COMPONENT REFERENCES
Tundish 15mm to 22mm - SC06006
Expansion Vessel Kit (12 Litre) - SC06001
Expansion Vessel Kit (18 Litre) - SC06002
Expansion Vessel Kit (25 Litre) - SC06003
Motorised Valve - SC06007
Immersion Heater - SC06009
Temp/pressure Relief Valve - SC06005
Twin Thermostat - SC06008
Inlet valve assembly - SC06004
WARNING: Should the factory fitted temperature and pressure
relief valve be tampered with your guarantee will be
invalidated. Neither the distributor nor manufacturer shall be
responsible for any consequential damage howsoever caused.
TABLE 1 – SIZING OF COPPER DISCHARGE PIPE (D2) FOR COMMON T&P RELIEF VALVE SIZES
Valve outlet Size Minimum size of Minimum size of Maximum resistance Resistance created by
discharge pipe D1 discharge pipe D2 allowed, expressed as a each elbow or bend
from tundish length of straight pipe
(i.e. no elbows or bends)
G1/2 15mm 22mm up to 9m 0.8m
28mm up to 18m 1.0m
35mm up to 27m 1.4m
G3/4 22mm 28mm up to 9m 1.0m
35mm up to 18m 1.4m
42mm up to 27m 1.7m
G1 28mm 35mm up to 9m 1.4m
42mm up to 18m 1.7m
54mm up to 27m 2.3m
MAINTENANCE
● To keep the cylinder in good operating order the cylinder should be serviced once a year by a Dimplex service engineer.
● If water is seen dripping through the tundish, please contact your installer or Dimplex service agent.
● To receive the 25 year guarantee please complete and return the guarantee card within 30 days of purchase / install
– please read Terms and Conditions on the guarantee card.
GUIDANCE IN THE EVENT OF A PROBLEM
● If you have a problem, in the first instance contact the plumber who fitted the unit. There after contact the plumber
who carries out the annual servicing for you.
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