Glow-worm BBU 45/4 - Manual (Page 6)

6 2000225023C
C
L BOILER
FLOW
PUMP
TO HEATING
CIRCUIT
INDIRECT
CYLINDER
1 METRE MIN
27 METRE MAX
RETURN
150mm
1 General
Diagram 1.5
9625
FULLY PUMPED SYSTEM
(DIAGRAMMATIC)
Diagram 1.4
PUMPED HEATING & GRAVITY DOMESTIC HOT
WATER (DIAGRAMMATIC)
9624
HEATING
SYSTEM
PUMP 28mm
1m MIN.
27m MAX.
INDIRECT
CYLINDER
15mm COLD FEED
22mm VENT
1.7 Hot Water Cylinder
The back boiler is suitable for open vented systems using an
indirect cylinder. The cylinder must be fitted to the manufacturer’s
recommendations and the system must conform to the
requirements of the current issue of BS5449.
It is recommended that the cylinder be fitted with some form of
temperature control.
1.8 Frost Protection
If the position of the 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 thermostat is fitted.
1.9 Draining Tap
System
A draining tap must be provided at the lowest point of the system
which will allow the entire system, the boiler and hot water
cylinder to be drained.
Draining taps shall be to the current issue of BS2879.
Boiler
A draining point is fitted at the bottom of the side of the heat
exchanger where the water connections are located, see diagram
1.1.
When draining is required cover the controls to avoid water
damage.
1.10 Safety Valve
A safety valve need not be fitted to an open vented system.
1.11 Boiler Location
This back boiler unit MUST NOT be installed in a private garage
or in a room containing a bath or shower or a room used or
intended to be used as sleeping accommodation.
1.12 Sealed Water System
A kit and instructions, part number 2000463000, 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.
1.13 Inhibitor
Attention is drawn to the current issue BS5499 and BS7593 on
the use of inhibitors in central heating systems.
If an inhibitor is to be used, contact a mnufacturer for their
recommendations as to the best product to use.
If using in an existing system take special care to drain the entire
system, including the radiators, then thoroughly cleaning out
before fitting the boiler whether or not adding an inhibitor.
The COLD FEED PIPE may be connected to flow
pipe, adjacent to the open vent pipe as shown.
(THERE MUST ALWAYS BE A COLD WATER
PATH TO THE RETURN CONNECTION OF THE
BOILER)
22mm
22mm