Sealed Systems; Electricity Supply; Installation Of Boiler - Warmworld FFC 30/60 Installation & Service Instructions Manual

Sealed Systems

A sealed system should follow the guidelines given
in the Code of Practice BS 7074 :1. It should include
a safety valve to BS 6750 Pt 1. fitted close to the
boiler, without an intermediate valve to the system
and in a position where it can be tested. It should be
preset to operate at 3 bar (45 lb/in²) and sited to
discharge through a pipe to a safe outlet.
An expansion vessel complying with BS 4814 must
be fitted to the system close to the return side of the
pump. The connection should be not less than
15mm and without a valve or restriction. Size the
vessel by using the table below.
1. Choose a vessel pressure by taking the static
head of the system, adding 0.3 bar, and taking
the nearest larger size.
2. Select the Vessel Volume from the table below by
finding the system volume and vessel pressure.
3. Choose that size or larger from the
manufacturers' range.
Vessel System Volume Litres
Pressure 50
Bar Vessel Volume
0.5 4
1.0 8
1.5 8
A pressure gauge with a fill pressure indicator and a
range of 0-4 bar should be fitted close to the expan-
sion vessel in a visible position.
A design as detailed below should be used for the
filling connection, it utilises a BS 1010 stop valve, a
double non-return valve and filling loop fitted at low
level and should be installed with the approval of the
local Water Undertaking.
ALTERNATIVE METHODS OF FILLING A SEALED
SYSTEM
Double
Method A
Check
Valve
Drain &
Assembly
Fill
Stop Valve
Test Cock
Method B
Cistern &
Overflow
Mains
Water
Supply
Condensing Boiler
60 70 100 150
4 8 8 12
8 8 12 18
12 12 18 24
Air Inlet
Hose Unions
Valve
Temporary Hose
Pressure
Pump &
Reducing
Valve If
Required
Stop Valve

Electricity Supply

Refer to Figs. 3 and 4.
Wiring external to the appliance MUST be in accord-
ance with the current I.E.E. Wiring Regulations and
any Local Regulations that apply.
The boiler is supplied for 230V ~ 50Hz. Single
phase. Fuse rating is 3A.
The method of connection to the mains electricity
supply MUST facilitate complete electrical isolation
of the boiler, preferably by the use of a fused double
pole switch having a 3mm (1/8in.) contact separation
in both poles and servicing only the boiler and
system controls.
The point of connection to the mains should be
readily accessible and adjacent to the boiler, except
that, for bathroom installations, the point of connec-
tion to the mains MUST be situated outside the
bathroom.
Note.
Where a room sealed appliance is installed in
a room containing a bath or shower, the appliance,
any electrical switch or appliance control utilising
mains electricity should be so situated that it cannot
be touched by a person using the bath or shower.

Installation Of Boiler

Suggested procedure:
1. Site to suit system and terminal limitations.
2. Mark Boiler Mounting Box fixing position. (Fig. 5).
3. Mark & Drill Flue hole(s).
(see Fig. 7 for Concentric, Fig. 8 for Twin Pipe).
4. Fix Boiler Mounting Box to the wall.
5. Remove the Electrical tray and the Case from
boiler module.
6. Plumb module for water and gas OFF the wall
(access is much better).
7. Fix the Boiler to its Mounting Box.
8. Plumb tails to system and gas.
9. Test for leaks.
Mains
Water
10. Replace the Case and Electrical tray.
Supply
Space Required for Installation and Service.
Right or Left
Above
Below
In Front
Drain &
Fill
5
30 mm 1 in.
30mm 1 in.
25mm 1 in.
450mm 18 in.
06/06/01