Instruction Manual

4
221725B
1.6 Water System - Open Vented
This back boiler can be used on an unrestricted open vented
system with the water supply taken from a feed and expansion
cistern, having a head between 1m (3ft3in) minimum and 27m
(90ft) maximum.
Diagrammatic layouts of systems are shown in diagram 1.4 and
1.5.
1.7 Sealed Water System
A kit and instructions, part number 459033, is available to
enable the back boiler to be used on a sealed water system.
Please give the serial number of the back boiler when ordering
the kit.
1.8 Hot Water Cylinder
The back boiler is suitable for open vented systems using an
indirect cylinder (including single feed self priming type). The
indirect cylinder must be fitted to the manufacturer’s
recommendations and the system must conform to the
requirements of the current issue of BS5546 and BS6700.
It is recommended that the indirect cylinder be fitted with some
form of temperature control.
1.9 Frost Protection
If the position of the back boiler is such that it may be vulnerable
to freezing it should be protected as specified in the current
issue of BS5422.
It is also recommended that a frost protection thermostat is
fitted.
1.10 Draining Tap
A draining tap must be provided at the lowest point of the system
which will allow the entire system, the back boiler and hot water
cylinder to be drained.
Draining taps shall be to the current issue of BS2879.
1.11 Safety Valve
A safety valve need not be fitted to an open vented system.
1 General
3013
FRONT
OPENING
C
L
ALL DIMENSIONS IN MM
PREPARED
BASE
Y
X
TABLE 1
FIRE TYPE
Miami 3 BBU 37-047-04A 37-047-07A
Melody 3 BBU 37-047-06A
Black Ash 3 BBU 37-047-08
Brown Ember 3 BBU 37-047-02A
Saxony 3 BBU 37-047-09
G.C No.
X Y X Y
Miami 3 BBU 642 698 750 836
Melody 3 BBU 642 698 750 836
Black Ash 3 BBU 700 660 840 890
Brown Ember 3 BBU 795 707 905 892
Saxony 3 BBU 700 625 840 860
6302
C
B 405 min.
A
PREPARED
BOILER
BASE
Diagram 1.2
FRONT OPENING
A B C
Miami 3 BBU 350 405 to 580 560 to 590
Melody 3 BBU 350 405 to 580 560 to 590
Black Ash 3 BBU 350 406 to 460 560 to 590
*Brown Ember 3 BBU 350 406 to 580 560 to 590
Saxony 3 BBU 350 406 to 460 560 to 590
TABLE 2
Dimensions
for minimum
flat area
(no fixtures)
FIRE TYPE
Dimensions
for fixture or
surround
protection
clearance
Teak Mahogany
1.12 Back Boiler Location
This back boiler MUST NOT be installed in a private garage or
in a room containing a bath or shower or in a room used or
intended to be used as sleeping accommodation.