Product Instruction Manual
Powerflow
PF30, 50, 80 & 100 litres
Unvented water heater
,4.2
Version 3.2 Jan 2015
V20
Thank you for purchasing a Powerflow series unvented electric water heater.
The Powerflow is suitable for hand washing and dishwashing where a
number of hot outlets are required such as kitchens, schools, restaurants,
washrooms and offices. The Powerflow is the ideal solution for light
industrial, commercial and light domestic hot water requirements.
Please read and understand these instructions before commencing
installation and leave them with the user when installation is complete.
1. Important safety points
Installation must be undertaken by a competent installer of unvented water
heating systems in accordance with building regulations G3.
Building regulations G3 require a temperature and pressure relief valve to be
factory fitted. This must not be removed or blocked in any way.
Installation must comply with the latest edition of the IEE wiring regulations.
These units are very heavy. They must be securely fastened to a suitably strong
wall using the fixings supplied. Remember to allow for the weight of the water
(1kg per litre capacity) when assessing the suitability of the fixing surface.
2. Installation
Component check list Qty
Expansion vessel ½” MBSP, pre-charge pressure 3.0bar 1
Vessel mounting bracket & banding 1
Pressure reducing valve 15mm pre-set pressure 3.5bar 1
3-way manifold with built in check and service valve 1
Tundish 15mm to 22mm 2
Flexible hose ½” MBSP to ½” BSP 1
6 bar pressure relief valve 15mm to 15mm 1
Tank wall mounting brackets 2
2
Wall Mounting
Temperature &
Pressure Relief Valve
POWERFLOW
Hot
Drain Cock
Drain
(Waste)
Pressure
(Expansion)
Relief Val ve
Expansion
Vessel
Check
Val ve
Balanced
O Take
Pressure
Reducing
Val ve
Service
Val ve
Cold
Mains In
Tundish
Drain
(Waste)
Plan your installation carefully in advance, allowing suitable space for installation and
future access to all fittings as shown in diagram 1.
Diagram 1
The unit must be installed vertically with water connection pipes at the bottom
and the pressure temperature relief valve at the top.
Ensure the mounting surface is strong enough to support the heater, including
the added weight when full of water.
The heater is not suitable for installation outside.
Do not install the heater where there is any risk of freezing.
The heater is bulky and heavy, do not attempt to lift alone.
3
Allow at least 500mm below
V
and 200mm above the heater
to facilitate future maintenance.
To mount the heater, drill two
holes for the supplied wall fixings
and hang the heater onto them
via the bracket at the rear.
Plumbing connections
Diagram 2
4
Observe the flow direction arrows on fittings.
It is important that the ordering of the fittings is correct as per the diagram
1 and 2.
Do not remove the factory fitted pressure and temperature relief valve.
Do not insert any other valves between the 3-way manifold and heater inlet
since it may prevent the safe expansion and discharge of water during heating
cycles.
Make the necessary connections, as per diagram 2, to inlet side of the heater
(as indicated by the blue collar).
It is recommended that the “balanced off take” is used to supply any cold outlet that is
paired to a mixer style tap supplied by the hot feed of the unit.
The orientation of the expansion vessel is important, it should be fixed firmly to the
supplied bracket in a vertical orientation with the water connection at the bottom and
located so that the length of the connecting pipework is kept to a minimum.
A drain cock (not supplied) should be fitted to a branch of the incoming supply pipe
at a point that is lower than both the unit and the expansion vessel (see diagram 1)
in order to allow full drain down for any future maintenance work.
Make the connection to any hot tap from the outlet side of the heater as
(as indicated by the red collar).
5
Discharge pipe connections
This product falls within the scope of Building Regulation G3 which stipulates certain
conditions relating to the way any water discharge from relief valves is transported
away.
These conditions are designed to ensure that any discharge will not present a hazard to
people or to property, and that any discharge is clearly visible so that the underlying
cause is likely to be rectified promptly.
The essential requirement of G3 in relation to water discharge is that the discharge pipe
MUST terminate in a safe, visible position.
In achieving this aim the G3 regulations strongly recommended that:
•
The tundish is located within 500mm of the Pressure and Temperature Relief valve
and it is wherever possible oriented vertically. It must be visible to occupants and
positioned away from electrical devices.
•
The discharge pipe has a vertical fall of at least 300mm immediately below the
tundish.
•
The discharge pipe below the tundish is at least 22mm diameter (i.e. one size larger
than the Pressure and Temperature Relief valve outlet).
•
The discharge pipe should be as straight and as short as is possible and positioned
away from electrical components.
Diagram 3 illustrates an acceptable discharge pipe arrangement. The table below the
diagram specifies how the maximum acceptable pipe length from the tundish to the
final outlet depends on the pipe diameter and the number of bends.
For example, in 22mm copper with no bends the pipe could be up to 9m long. With two
bends present the maximum length drops to 9.0m - (2 x 0.80m) = 7.4m.
6
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