Condensate
Disposal
17
5.3 Domestic Hot Water
System
To maintain a longer and more
consistent hot water temperature, a flow
restrictor is factory fitted to all models
except the Vortex Pro Combi 36e, to
limit the flow rate to approximately 15
litres/minute.
The flow restrictor is located in the
outlet side of the cold water inlet
isolating valve.
The incoming mains water pressure
should be between 1 and 8 bar to
ensure efficient operation.
If the pressure is above 8 bar a pressure
reducing valve must be fitted.
The boiler may still operate down to a
pressure of 1.0 bar but with a reduced
flow rate. The minimum flow rate
needed for the flow switch to operate is
3 litres/minute.
To ensure economic use, the pipe runs
between the boiler and hot taps should
be as short as possible and in 15 mm
copper pipe or 22 mm for the Vortex
Pro Combi 36e only. Where possible the
pipework should be insulated to reduce
heat loss.
All taps and mixing valves used in the
domestic hot water system must be
suitable for operating at a mains
pressure of up to 8 bar.
If required, a shower may be fitted in the
domestic hot water system. It is
recommended that thermostatically
controlled shower valves are used to
protect against a flow of water at too
high a temperature. If a fixed head type
shower is used, no anti-syphonage
devices are required. If a loose or
flexible head type shower is used, it
must be arranged so that the head
cannot fall closer than 25 mm above the
top of the bath, thereby preventing
immersion in the bath water. If this is not
practicable, an anti-syphonage device
must be fitted at the point of the flexible
hose connection.
The supply of hot and cold mains water
direct to a bidet is allowed (subject to
local Water Undertaking requirements)
provided that the bidet is of the over-rim
flushing type. The outlets should be
shrouded and unable to have a
temporary hand held spray attached.
Arrangements for antisyphonage are not
necessary.
5.4 To use the Water Hardness
Kit
Fill a clean container with a sample of
water from the mains cold water supply
to the boiler.
Immerse the test strip in the water for
approximately one second, ensuring
that all the test zones are fully wetted.
Shake off the surplus water and wait for
one minute.
Assess the colouration of the test zones
using the following chart.
If the hardness reading is found to be in
the medium to very hard range (the
shaded area), it is essential that some
form of water conditioner or softener is
fitted to reduce scale formation within
the combination boiler. Failure to do so
may invalidate both the manufacturers
warranty and any extended warranty
covering the appliance.
The water conditioner or softener
should be fitted to the cold water supply
serving the appliance and in accordance
with the manufacturer’s instructions.
Grant Engineering (UK) Ltd. cannot be
held responsible for any damage or
misuse caused by the fitting of any
water conditioning device.
Before the mains water supply pipe is
connected to the boiler, it should be
thoroughly flushed out to avoid the
danger of dirt or foreign matter entering
the boiler.
The mains water connection to the
boiler must be the first connection from
the mains supply.
Please protect the domestic hot
water system from harmful effects
of scale. Problems caused by the
build-up of limescale are not covered
under the terms of the warranty.
!
CAUTION
A water hardness test kit is supplied
with the boiler. Should the total
hardness of the water supply exceed
125 ppm, an in-line scale inhibitor
should be fitted in the cold water
supply to the boiler.
Consult the local Water Undertaking
if in doubt.
Do not immerse the test strip in
running water and avoid contact.
!
NOTE
Green Areas Violet Areas Hardness Total Hardness mg/l (ppm)
4 0 Very Soft <50 mg/l calcium Carbonate
3 1 Soft <70 mg/l calcium Carbonate
2 2 Medium <125 mg/l calcium Carbonate
1 3 Hard <250 mg/l calcium Carbonate
0 4 Very Hard <370 mg/l calcium Carbonate
Note: (1mg/l = 1 ppm (part per million)
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