Glow-worm Flexicom 18sx User Manual

12
5 Water System - Heating
5.1 General
This boiler is designed for use as part of a sealed water
central heating system with fully pumped circulation. The
pump, expansion vessel and associated safety devices are all
tted within the boiler.
5.2 Safety Valve
The safety valve is an integral part of the boiler and it cannot
be adjusted. The pipe from the safety discharge valve must
not discharge above an entrance, window or any type of
public access area.
5.3 Expansion Vessel
The boiler has an integral expansion vessel with a capacity of
8 litres (1.76 gallons), with a charge pressure of 0.5bar.
NOTE: The expansion vessel volume depends on the total
water system volume and the initial system design pressure.
In GB, Guidance on vessel sizing is also given in the current
issue of BS5449 and BS7074 Part 1.
In IE, current edition of I.S.813 “Domestic Gas Installations”
5.4 Flow Rate
If it is necessary to alter the ow rate, the system can be
tted with a lockable balancing valve in the main ow or
return pipes shown as valve “A” in diagram 5.1. The ow rate
through the boiler must not be allowed to fall below that given
in section 1 - Specication Table.
14023
Diagram 5.1
BOILER
DRAIN
POINT
'A'
FLOW CONTROL
VALVE
HEATING
CIRCUIT
RETURN
ADDITIONAL
EXPANSION
VESSEL
(if required)
13073
Diagram 5.2
5.5 Bypass
The boiler is tted with an automatic bypass, see diagram 5.2.
and section 12 Commissioning. The pump remaining
conveying capacity is shown in diagram 5.3
Ensure that under no circumstances does the ow rate drop
below the gure specied, refer to section 1 - Specication
Table.
5.6 Filling the Sealed System
Provision for lling the system at low level must be made, see
diagram 5.4. There must be no permanent connection to the
mains water supply, even through a non-return valve.
NOTE: It is important that ttings used for connection
to potable water comply with the water undertakings
requirements.
5.7 Draining Points
Draining taps must be provided at all low points of the system,
which will allow the entire system to be drained.
Draining taps shall be to the current issue of BS2879.
Drain points for the appliance are provided at the positions
shown in diagram 5.5.

Glow-worm Flexicom 18sx Specifications

General

Brand	Glow-worm
Model	Flexicom 18sx
Category	Boiler
Language	English