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7.
MAINS CONNECTION
Connection to the mains water supply or to a water storage
cistern supplying domestic water even through a non return
valve must not be made without the approval of the local
Water Authonty.
8.
FILLING
The system should be fitted with a filling point at low leveL
Methods of filling and making up sealed systems are described
in
BS
5449:Part 1 Two methods of filling a sealed system are
shown in Fig. 6
9.
VENTING
The automatic air vent fitted to the appliance is fitted with a
protective black plastic screw cap_ This should be removed
and discarded. Air will now automatically be vented from this
point during fil!ing. See Fig. 29.
The heating system should be fitted with manual air vents at
all h1gh pomts.
1 0. COMMISSIONING
For a complete description of the commissioning procedure
refer to Section 14-Commissioning the Appliance.
(a)
Flush the whole system with cold water and fill until the
pressure gauge registers 1 .5 bar (21 .5 p.s.i.). Clear any air locks
and check for water soundness
(b) Check the operation of the safety
valve.
Release water from the
system until the initial system design pressure is obtained,
taking into account any difference in height between the
pressure gauge and the point at which the pressure vessel is
connected.
NOTE: The initial system design pressure should be 0.3 bar(4.5
p.s.i.) plus the static head of the system. Total pressure must
not exceed 1. 5 bar {21.5 p.s.
i.).
(c)
Light the boiler and heat the system to maximum working
temperature. Check for water soundness. Turn off the appli-
ance and drain the system while
it
is still hot.
(d) Refill and
vent
the system. Adjust to the initial system design
pressure. Any set pointer on the pressure gauge should be set
to coincide with the indicating pointer.
Fig. 5. Sealed primary water system.
~-------.,
r-------- ..
rj
llllllll, JIll I Ill"
L-------..1
1
I
1--------..1
I
*
* *
*
--- i-- ---- _____
....!._
--r--~-
------
.J ____ ..,
I
I
I
--~-------------...1-------------..,
I
I
I
'
I
I
I
NOH: A DRAIN COCK SHOULD BE
I
INSTALLED AT THE LOWEST
I
POINT OF THE SYSTEM AND
I
BENEATH THE BOILER
I
I
I
I
~ ~ J : ~ H l : l !
II
~
Jl\11~!;0~~
f----
11. SYSTEM BY-PASS
A suitable by-pass designed to give the minimum flow rate
corresponding to the heating output
US!~d
must be fitted. See
Table 3.
A suitable position for the by·pass is shown in Fig. 5. The by·
pass should be connected in 22 mm dfameter pipe at least
2 metres (7
ft.)
from the appliance and fitted with a suitable
valve to provide adjustment.
To adjust the by-pass, the boiler should be operated on central
heating with the system by-pass and radiator
valves
set fully
open for at least 45 minutes. With the aid of a contact
thermometer, balance the heating system and restrict the by-
pass by the minimum amount necessary to give a temperature
rise across the flow and return pipe of 11 °C (20°F).
12. PUMP
The central heating pump has been set at MAXIMUM and
must not be adjusted.
SPHERICAL PLUG BALL
VALVEFORA~CE
SERVICING
""
DOMESTIC COLD WATER
TO TAPS, SHOWER
ANOW.C
I
r - " - - -
BRITISH STANDARD
STOP VALVE FIXED
SPINDL£TYPE
:
MAIN
~--2m(7ft1
MIN.--
r--,
I
I
-
DOMESTIC
HEATING RETURN
:
HOT
I
I
WATER
HEATING FLOW
_1_ __ ~---,
I
!
:
e
I
I
lfl
F
AUT0~1TIC
1
1
I
I
j
SUPPLEMENTARY
EXPANSION VESSE
I
I I
AIR VENT
I
Refer tro Section 8
'
Paragraph 5.
I
FLOW RESTAICTORS
BOILER
I
•
I
0
HEAT
0
~
BANK
~
~
~
~
~~
~
EXPAJSION
~a?
~
PRfSSURf
1
~*
'!'
GAUGE
VESSEL
APf'LIANCE
I
CASING
I
------------------~
8
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