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5.2
MaKinG thE WatER
COnnECtiOnS
Flow and return pipework can be routed to either side of the
boiler, dependant on the flue system used, from the push-fit
elbows (supplied) on the flow and return connection. Refer to
Figure 5-1.
Holes are provided in the rear of the casing side panels to allow
the condensate pipe to be run through the back of the boiler. It will
be necessary to remove the back panel from the boiler casing to
fit this pipework, and to refit the panel before placing the boiler in
its final position. Refer to Figure 6-3.
If access will be restricted, make any connections to the boiler
before placing it in its final position. If using a balanced flue
system - Install the balanced flue system before connecting the
heating system pipework to the boiler.
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 36, 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.
! nOtE !
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 36 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 overrim flushing type. The outlets should
be shrouded and unable to have a temporary hand held spray
attached.
Arrangements for antisyphonage are not necessary.
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.
Section 5: pipe Connections
5.4
tO USE thE WatER haRDnESS
Kit
! nOtE !
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.
Fill a clean container with a sample of water from the mains
1.
cold water supply to the boiler.
Immerse the test strip in the water for approximately one
2.
second, ensuring that all the test zones are fully wetted.
Shake off the surplus water and wait for one minute.
3.
Assess the colouration of the test zones using the following
4.
chart.
figure 5-2: Key to water hardness
Green
Violet
hardness
areas
areas
4
0
Very soft
3
1
Soft
2
2
Medium
1
3
Hard
0
4
Very hard
Note: 1mg/l = 1 ppm (part per million)
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 guarantee and any extended guarantee 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 UK cannot be held responsible
for any damage or misuse caused by the fitting of any water
conditioning device.
! CaUtiOn !
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
guarantee.
total hardness mg/l (ppm)
<50 mg/l calcium carbonate
<70 mg/l calcium carbonate
<125 mg/l calcium carbonate
<250 mg/l calcium carbonate
<370 mg/l calcium carbonate
page 17
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