
GENERAL INSTALLATION
CYLINDER CONNECTIONS
All plumbing connections should be made to the Zip AquaFlo and its
safet devices using the 15mm or 22mm compression fittings, nuts
and olives supplied.
CYLINDER RELIEF VALVE CONNECTIONS
Safet relief valve connections should not be used for an other
purpose and no valve should be fitted between the expansion relief
valve and the storage c linder.
COLD MAINS PIPEWORK
Run the cold main through the building to the place where the
AquaFlo is to be installed. Take care not to run the cold pipe near hot water
or heating pipe work so that the heat pick up is minimized. Identif the
cold water suppl pipe and fit an isolating valve (not supplied).
A 22mm BS1010 stopcock can t picall be used but a 22mm quarter
turn full bore valve would be better as it does not restrict the flow as
much. Do not use “screwdriver slot” or similar valves.
Make the connection to the cold feed of the c linder and incorporate a
drain valve. Position the inlet control just ABOVE the Temperature &
Pressure Relief Valve (TPRV) mounted on the side of the c linder. This
ensures that the c linder does not have to be drained down in order to
service the inlet control set. Ensure that the arrow points in the direction
of the water flow. Select a suitable position for the expansion vessel.
Mount it to the wall using the bracket provided. Use the hose to
connect to the inlet control group.
BALANCED COLD CONNECTION
If there are to be showers, bidets or monobloc taps in the
installation then a balanced cold suppl is a requirement. There is a
22mm balanced connection on the inlet control set that must be used for
this purpose.
HOT WATER PIPEWORK
Run the first part of the hot water distribution pipework in 22mm. This
can be reduced to 15mm and 10mm as appropriate for the t pe of tap
etc. Your aim should be to reduce the volume of the hot draw off
pipework to a practical minimum so that the time taken for the hot water is
as quick as possible.
Do not use monobloc mixer tap or showers if the balanced cold
connection is not provided. This arrangement will back pressurise the unit
and result in discharge. Ensure that the top of the vessel is accessible for
servicing.
PRIMARY COIL CONNECTIONS (Indirect Onl ) Compression
connections are provided for the primar circuit which must be
positivel pumped. Primar flow and return connections are
interchangeable to suit site conditions without affecting reheat times.
Sealed or vented primar circuits can be used, to compl with
normal installation practice the primar pressure should not exceed 3
bar although the coil in AquaFlo is suitable for up to 7 bar if required.
The boiler ma be Gas, Electric, Oil etc but must be under effective
thermostatic control. AquaFlo is not intended for use with uncontrolled
heat sources such as some AGA’s, back boilers, solid fuel stoves etc.
The two port zone valve should be installed into the primar flow
pipework leading to the coil flow inlet. The direction of flow arrow
should be towards the primar flow connection.
SECONDARY CIRCULATION
Where secondar circulation is required a circulator suitable for
potable water should be used in conjunction with a non return valve to
prevent backflow.
It ma be necessar to incorporate an extra expansion vessel into the
circuit to accommodate the increased s stem water volume in larger
secondar circulation s stems. Where off peak electrical tariffs are being
used then secondar circulation should be avoided. A secondar return
boss is fitted as standard on 210, 250 & 300L. On smaller sizes tee into
the cold feed pipe above the drain.
IMMERSION HEATERS
As a requirement of Building regulations the AquaFlo immersion
heaters are fitted with thermal cut-out in addition to the normal
control thermostat. To help ensure correct replacement the
immersion heaters have a special 1
3
/4” thread. The are of a low noise
Incolo construction and rated at 3 kW at 240 V. Replacement immersion
heaters should be purchased from Zip Heaters otherwise the product
warrant ma be affected.
Under no circumstances should immersion heaters without thermal
cut-outs be fitted to the Zip AquaFlo.
The O’ring on the head of the immersion heater should be correctl
positioned and lubricated before fitting. Screw in until hand-tight then
gentl tighten as the O’ ring will seal easil . The electrical suppl to
each immersion heater must be fused at 13A via a double pole
isolating switch to BS 3456. The cable must be 2.5mm
2
heat resistant
(85°C HOFR) sheathed flex compl ing to BS 6141:1981 Table 8.
Do not operate the immersion heater/s until the unit is full of water. If an
sterilisation liquid is in the c linder do not operate the immersion heater/s
as this will cause premature failure. The electrical suppl must be from
a fused suppl compliant with local regulations and fitted b a suitabl
qualified Electrician.
ENERGY CUT OUT AND CYLINDER THERMOSTAT (Indirect
Onl )
As a requirement of Building regulations the AquaFlo units are fitted with
a thermal cut-out in addition to the normal control thermostat. This unit
should be fitted to the dedicated boss on the c linder and wired to the
two port valve controlling the primar flow (see wiring diagram).
AQUAFLO UNVENTED INDIRECT
Twin Coil Solar
Indirect twin coil units can be installed in two separate formats:
a)
In a solar powered s stem with a fossil fuel boiler.
b)
In a s stem with two independent fossil fuel boilers.
With either format it is essential the overall installation meets all
current legislation including, in particular, the high limit isolation
requirements of Building Regulation G3. This document is designed to
assist in achieving this aim.
Upper Coil
The upper coil is connected to the fossil fuel boiler as per the
instructions for the AquaFlo single coil model with the control and high
limit thermostat inserted into the middle stat pocket. The wiring
requirements are as depicted in this guide.
Lower Coil: Solar Installation
In a solar powered s stem the lower coil is connected to the solar heat
source. Either primar coil connection ma be utilised as the flow or
return. The solar c linder sensor, supplied as part of the solar controls,
inserts into the lower stat pocket. It is necessar to mount the solar
pump in the return pipework with the two port valve (supplied with
the c linder) installed between the c linder and the pump.
This valve is of the powered open, sprung closed design and is wired
through the high limit stat which inserts into the upper stat pocket. Two
wiring options for high limit isolation are provided in this guide. The
control thermostat is not required in a solar installation.