5
10. MAINTENANCE - ELECTRICAL COMPONENTS
ALWAYS SWITCH THE ELECTRICAL SUPPLY OFF BEFORE UNDERTAKING ANY MAINTENANCE TO THE
HEATER UNIT.
SERVICING OF ELECTRICAL PARTS SHOULD ONLY BE UNDERTAKEN BY COMPETENT INDIVIDUALS.
All maintainable electrical components are located under a plastic cover that is next to the inlet and outlet pipes and held in
position with two small screws. Remove screws and lower cover to provide access to components. See diagram below for
electrical parts identifi cation.
IF REPLACING ELECTRICAL PARTS TAKE PARTICULAR ATTENTION TO ENSURE THAT THE EARTHING
CONNECTIONS (GREEN/YELLOW) TO THE ELEMENT FLANGE AND THERMOSTAT HOUSING ARE SOUND.
11. MAINTENANCE - THERMAL CUT-OUT RE-SET
This unit contains a manually re-settable thermal cut-out that will switch the power off if the temperature reaches an
abnormally high level. To reset the cut-out the press button as shown in Diagram 4.
12. MAINTENANCE – DE-SCALING PROCEDURE
If scale is allowed to build up heater performance will suffer and the life of the product will be reduced.
THE EFFECTS OF LIMESCALE ARE EXCLUDED FROM ANY WARRANTY.
To de-scale the heater, gain access to the element following the instructions set out in section 10.
Remove thermostat and thermal cut-out bulbs from respective pockets and unscrew the 6 nuts holding the element fl ange in
position. Withdraw element.
Remove scale carefully. If necessary, dip element in a de-scaling solution available from DIY or plumbing outlets. Do not allow
electrical connections to become wet.
It is not normally necessary (or practical) to attempt to remove any scale from the tank walls.
Refi t element and follow commissioning instructions as per section 8.
13. MAINTENANCE – ANODE INSPECTION
There is a magnesium anode fi tted to most models of the Powerfl ow.
It is a grey magnesium cylinder fi tted to the element base and its role is to reduce the rate of corrosion of the tank.
It should be inspected periodically and replaced if there are signs of disintegration from a solid metallic structure.
To access the anode, follow instructions in section 10.
Remove scale carefully. If necessary, dip element in a de-scaling solution available from DIY or plumbing outlets. Do not allow
electrical connections to become wet.
Diagram 4
Element fl ange -
Remove to access anode
Thermostat
Thermal cutout -
Press here to reset
3. INSTALLATION OVERVIEW (Continued)
ENSURE THE WALL IS STRONG ENOUGH TO SUPPORT THE HEATER, INCLUDING THE WEIGHT OF THE
WATER WHEN FULL.
THIS HEATER IS NOT SUITABLE FOR OUTDOOR INSTALLATION.
DO NOT INSTALL WHERE THERE IS ANY RISK OF FREEZING.
Plan your installation carefully and choose a suitable position for the heater, allowing suitable space for accessories such
expansion vessels, pipework and subsequent maintenance.
See schematic Diagram 1 for the correct relative positions of the components.
FIT ALL THE COMPONENTS SUPPLIED. COMPONENTS MAY BE SUPPLIED LOOSE OR CONNECTED TO A
MANIFOLD. THE MANIFOLD AIDS INSTALLATION BUT DOES NOT ALTER THE RELATIVE POSITIONS OF
THE COMPONENTS.
DO NOT REMOVE THE FACTORY FITTED TEMPERATURE AND PRESSURE RELIEF VALVE.
ENSURE IN PARTICULAR THAT THERE ARE NO VALVES OF ANY KIND BETWEEN THE EXPANSION RELIEF
VALVE AND THE HEATER.
ALLOW AT LEAST 400MM OF SPACE ABOVE AND BELOW THE UNIT TO PERMIT FOR MAINTENANCE.
OBSERVE FLOW DIRECTION ARROWS ON COMPONENTS.
4. MOUNT ON WALL
Drill holes for supplied heavy duty bolts to wall at the spacings shown in the table below (also See Diagram 2).
Insert bolt hooks and tighten ensuring that they are secure then hang heater on the protruding hooks.
2
Temperature and Pressure Relief Valve
POWERFLOW
Hot
Drain Cock
To Drain (Waste)
Pressure
(Expansion)
Relief Valve
Expansion
Vessel
Check Valve
Balanced
Cold Water
Draw Off
Pressure
Reducing Valve
Service
Valve
Cold Water
Mains
Diagram 1
B
A
Diagram 2
Model
Vertical Bolt
Spacing A (mm)
Horizontal Bolt
Spacing B (mm)
PF30L 270 320
PF50L 520 320
PF90L 430 320
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