Grant Vortex Eco User Manual

Sealed Systems
21
7 Sealed Systems
7.1 Sealed System Installation
See Figure 7-1.
All Grant Vortex Eco Wall Hung boilers
are suitable for use with sealed systems
complying with the requirements of BS
5449.
The maximum temperature of the
central heating water is 75°C.
The system must be provided with the
f
ollowing items:
• Diaphragm expansion vessel
complying with BS 4814.
• Pressure gauge.
• Safety valve.
• Approved method for filling the
system.
Refer to BS 7074:1 for further guidance.
The expansion vessel can be fitted in
either the return or flow pipework in any
of the recommended positions as
shown in Figure 7-1. To reduce the
operating temperature of the expansion
vessel diaphragm, position it below the
p
ipe to which it is connected. The
expansion vessel may be positioned
away from the system, providing the
connecting pipe is not less than 13mm
diameter.
The pressure gauge should have an
operating range of 0 to 4 bar.
The safety valve, set to operate at
2.5 bar, should be fitted in the flow
pipework near to the boiler.
The pipework between the safety valve
and boiler must be unrestricted, i.e. no
valves. The safety valve should be
connected to a discharge pipe which
will allow the discharge to be seen, but
cannot cause injury to persons or
property.
Provision should be made to replace
water lost from the system. This can be
done manually (where allowed by the
local water undertaking) using an
approved filling loop arrangement
incorporating a double check valve
a
ssembly (as supplied fitted on System
models).
An automatic air vent should be fitted to
the highest point of the system.
The system design pressure (cold)
should be between 0.5 and 1.0 bar. This
pressure is equivalent to the maximum
static head (see Figure 7-2) in bar + 0.3
(1 bar = 10.2 metres of water).
If thermostatic radiator valves are fitted
to all radiators, a system by-pass must
be fitted. The bypass must be an
automatic type.
Filling of the system must be carried out
in a manner approved by the local
Water Undertaking.
Where allowed, the system may be filled
via the filling loop supplied (the loop
arrangement includes a double check
valve assembly).
All fittings used in the system must be
able to withstand pressures up to 3 bar.
Radiator valves must comply with the
requirements of BS 2767(10):1972.
One or more drain taps (to BS 2879)
must be used to allow the system to be
completely drained.
Figure 7-1: Sealed system
Figure 7-2: Sealed system boilers
Optional zone
valves
Optional
diverter valve
Alternative position
for expansion vessel
and pressure gauge
Alternative position
for expansion vessel
and pressure gauge
Static head of system
Heating flow
Heating
return
By-pass if required
(automatic type)
450mm
Alternative position
for expansion vessel
and pressure gauge
To radiators
From radiators
Air vent
Safety valve
Boiler shell
Boiler
Expansion
vessel
Pump
If thermostatic radiator valves
are fitted, the system must
incorporate an adequate by-pass.

Grant Vortex Eco Specifications

General

Model	Vortex Eco
Category	Boiler
Fuel Type	Oil
Type	Condensing
Warranty	2 years