AquaFlo Installation, Maintenance and User Instructions Page 16 of 24 V 2.01 - October / 2012
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 rst part of the hot water distribution pipework in 22mm. This can be reduced to
15 mm and 10 mm as appropriate for the type 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.
Primary coil connections (Indirect Only)
Compression connections are provided for the primary circuit which must be positively pumped.
Primary ow and return connections are interchangeable to suit site conditions without affecting
reheat times.
Sealed or vented primary circuits can be used, to comply with normal installation practice the
primary pressure should not exceed 0.3 MPa (3 bar) although the coil in AquaFlo is suitable for up
to 0.7 MPa (7 bar) if required. The boiler may be Gas, Electric, Oil etc but must be under effective
thermostatic control. Zip 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 primary ow pipework leading to the coil ow inlet. The direction of ow arrow should be
towards the primary ow connection. On twin coil cylinders an extra thermostat boss is provided.
Secondary circulation
Where secondary circulation is required a circulator suitable for wholesome water should be
used in conjunction with a non return valve to prevent back ow.
It may be necessary to incorporate an extra expansion vessel into the circuit to accommodate
the increased system water volume in larger secondary circulation systems. Where off peak
electrical tariffs are being used then secondary circulation should be avoided. A secondary
return boss is tted as standard on 210, 250 & 300 litre. 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 tted with thermal
cut-out in addition to the normal control thermostat. To help ensure correct replacement the
immersion heaters have a special 1
¾
” thread. They are of a low noise Incoloy construction and
rated at 3kW at 240V. Replacement immersion heaters should be purchased from Zip Heaters
otherwise the product warranty may be affected. Note! Titanium elements are also available for
areas with aggressive water, constant cycling and high usage. (See parts on page 13).
Undernocircumstancesshouldimmersionheaterswithoutthermalcut-outsbettedto
Zip AquaFlo.
The o-ring on the head of the immersion heater should be correctly positioned and lubricated
before tting. Screw in until hand-tight then gently tighten as the o-ring will seal easily.
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