10
Henrad SE FF
- Installation
GENERAL
Note.
The pump manufacturers' minimum requirements must be complied with.
Note. The
method of filling, refilling, topping up or
flushing sealed primary hot water circuit from the
mains via a temporary hose connection is only
allowed if acceptable to the local water authority.
5
LOW HEAD AND LARGE SYSTEMS WITH EXTENSIVE PIPE RUNS - OPEN VENT
All dimensions in mm (in.).
NB. Imperial dimensions are approximate
6
SEALED SYSTEM REQUIREMENTS
This arrangement is useful for large systems where
radiators at the extremities are difficult to vent. This can
lead to pumping over with conventional feed and vent
arrangements.
The following conditions MUST be observed:
1. The top of the automatic air vent must be below the
cold water level.
2. The static water level (cold) must be at least 200mm
above the top of the horizontal flow pipe, fitted as
shown. The vent connection MUST NOT be made
immediately off the top of the boiler as venting is made
less efficient.
3. The maximum practical length of 22mm cold feed pipe
should be used in order to reduce the effective volume
of hot system water expanding into the feed/expansion
cistern to a minimum.
a.
A non-adjustable preset lift pressure not exceeding 3bar
(45lb/in
2
).
b.
A manual testing device.
c.
Provision for connection of a discharge pipe.
The valve or discharge pipe should be positioned so that
the discharge of water or steam cannot create a hazard to
the occupants of the premises or cause damage to
electrical components and wiring.
3. Pressure Gauge
A pressure gauge covering at least the range 0-4 bar
(0-60 lb/in
2
) must be fitted to the system. The gauge should
be easily seen from the filling point and should preferably be
connected at the same point as the expansion vessel.
1. General
a.
The
installation
must comply
with the
requirements
of BS. 6798
and BS.
5449.
b.
The
installation
should be
designed to
work with flow
temperatures of up
to 82° C.
c.
All components of the system, including the heat
exchanger of the indirect cylinder, must be suitable
for a working pressure of 3 bar (45lb/in
2
) and
temperature of 110°C. Care should be taken in
making all connections so that the risk of leakage
is minimised.
2. Safety Valve
A spring loaded safety valve complying with the relevant
requirements of BS. 6759 must be fitted in the flow
pipe as close to the boiler as possible and with no
intervening valve or restriction. The valve should have
the following features:
Содержание Henrad SE 30 FF
Страница 1: ......
Страница 2: ...2 Henrad SE FF Installation ...
