13
JINTDBW09 Rev B 05/03/15
I
NSTALLATION OF
H
EATING
&
H
OT
W
ATER
S
YSTEM
We strongly recommend that a knowledgeable,
experienced and qualified plumbing and heating
engineer is responsible for the design and
installation of the heating and hot water system.
Hunter Stoves Ltd cannot accept responsibility for
any consequential loss, however caused, due to
under or over specification of the appliance in any
installation.
Do Not –
Under any circumstances connect the
stove to a sealed (pressurised)
heating system or unvented hot water
cylinder.
Do Not –
Link the stove into a heating or hot
water system with an existing boiler
without the use of suitable equipment
such as a neutralizer. When fitting this
type of system the neutralizer
manufacturer’s instructions must be
followed.
Do –
Fit an open cold feed and expansion
cistern with separate cold feed and
vent pipes. The cold feed and vent
pipes must be unvalued. The open vent
pipe should have a diameter of 22mm
and rise continuously from the boiler.
It is common practice to form the vent
pipe from an extension of the primary
flow (see diagram).
Do –
Connect the stove to a
double feed,
indirect
hot water cylinder via 28mm
copper flow and return pipe work,
rising continuously from the boiler to
the cylinder. The cylinder and heat leak
radiator must be sited higher than the
stove.
Semi pumped systems should be used on heating
and hot water systems with gravity circulation to
the hot water cylinder and one unvalved 2 KW
radiator to act as a heat leak when the central
heating is switched off.
All four tappings on wraparound boilers should be
used for systems incorporating separate gravity
and pumped heating loops. Each flow and return
should be taken from diagonally opposite sides of
the boiler.
If a common flow and return is used, these should
also be taken from diagonally opposite sides of
the boiler, and plugs inserted into the sockets not
used.
Systems using a common flow and return to the
boiler should incorporate an injector tee on the
primary return connection from the central
heating pump (see diagram).
A HIGH LIMIT thermostat should be fitted to the
gravity flow pipe close to the boiler and set at
90°C. This should override any pump control,
switching the pump on and dissipating any excess
heat around the radiator circuit.
To prevent boiler corrosion due to condensation it
is necessary to maintain the return water
temperature above 45°C. This can be achieved by
the use of a LOW LIMIT thermostat on the return
pipe from the hot water cylinder, close to the
boiler. The thermostat should make on
temperature rise, preventing the circulating pump
from operating until the gravity circuit is up to
temperature.
