Primary Cir
c
uit
Installation
11
3
Primary Circuit Installation
3.3 Systems (DuoWave
Indirect solar cylinders only)
If an existing system is a “flow share”
arrangement such as an “S” or “Y” plan
type system, (see Figures 5-4, 5-5 and
5-6) they will provide satisfactory
results, but during central heating
demands, hot water production will not
be as responsive. If this is important,
consider the use of a “W” plan type
system. (See Figures 5-2 and 5-3).
3.4 Primary Connections
(DuoWave Indirect solar and
Duowave HP cylinders only)
1. The primary flow and return
connections from the boiler or heat
pump (for HP cylinders) should be
made to the upper coil connections
of the cylinder.
The motorised valve (supplied) must
be fitted into the primary flow. The
primary flow and return fittings are
22mm compression. The valve has
22mm compression connections.
2. Locate the dual thermostat in the
stainless steel pocket (refer to either
Figure 2-1 or 2-3, as appropriate,
for location) and secure using the
retaining screws on the thermostat
housing.
3. Any automatic or manual air vent
fitted to vent air from the upper coil
should be installed on the primary
flow pipe to the coil.
3.5 The 2-Port Valve
(DuoWave Indirect solar and
Duowave HP cylinders only)
To prevent gravity circulation when the
boiler or heat pump switches off, the
2-port motorised valve supplied with
the unvented hot water kit, must be
fitted in the primary flow pipe to the
cylinder and wired in accordance with
Figures 5-3, 5-5 or 5-7 for boilers
(depending on system design) and
Figure 5-9 for a Grant Aerona heat
pump to comply with current legislation.
For other makes of heat pump please
check with the heat pump manufacturer
for connection details.
3.6 Auxiliary Primary
Connections
Solar Heating
1. The Solar flow and return
connections should be made to the
lower coil connections. If the lower
coil is not thermostatically controlled
a 2-port or solenoid valve (high
temperature rated - not supplied)
must be fitted in the flow and be
controlled from the dual thermostat
mounted at low level on the cylinder,
via the thermostat pocket (8).
Contact Grant UK for details.
2. If you are connecting another
primary heat source please refer to
the installation manual of that
appliance. Do not connect an
uncontrollable appliance to this
cylinder (e.g wood burning stove,
multi fuel stove, etc.).
3.7 Hard Water Areas
If the cylinder is to be used in a hard
water area, we recommend that the
primary flow temperature be limited to
75˚C. This will help reduce the migration
of suspended solids in the water and
help prevent the build up of lime scale.
3.1 Grant DuoWave Solar
Cylinders
Grant DuoWave indirect solar cylinders
are suitable for connection to most fully
pumped domestic gas or oil fired
central heating boilers working on an
open vented or sealed system having a
maximum working pressure of 3 bar
and a maximum working temperature of
90ºC.
If you are in any doubt over the
Suitability of a boiler for use with the
cylinder, consult the boiler
manufacturer.
3.2 Grant DuoWave HP
Cylinders
Grant DuoWave HP indirect cylinders
are specifically designed for connection
to most fully pumped Air Source Heat
Pump systems (such as the Grant
Aerona Heat Pump range)- either open
vented or sealed systems having a
maximum working pressure of 3 bar
and a maximum working temperature of
90ºC.
If you are in any doubt over the
suitability of an Air Source Heat
Pump (other than a Grant Aerona
heat pump) for use with the cylinder,
consult the heat pump manufacturer.
IMPORTANT
Solid fuel or wood burning boilers
and gravity circulation systems
must
not
be used on the
primary circuit
of an unvented hot water system.
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