Firebird Enviromax Condensing Range
3
16
3.2 - DOMESTIC HEATING & HOT WATER
Hot and Cold taps, mixing valves and fittings must be
suitable for operating at mains pressure up to 10 bar
Bidets with the supply of hot and cold mains water are
permitted if they are of the over-rim flushing type and
have shrouded outlets which enable them to have
temporary hand held spray attached. Showers of loose
headed or flexible type must be fixed so that the head
cannot fall closer than 25mm above the top edge of the
bath to prevent it immersing into the bath water.
Alternatively the shower should have a double check
valve incorporated at the point of the flexible
connections.
WATER FLOW REGULATION
The flow rate of water from individual taps may be
affected by any of the following:-
1. Number of taps in use at one time
2. Cold mains pressure
3. Diameter and length of pipework in the
domestic water circuits within the dwelling.
4. Excessive flow from 3/4” bath taps in a house
system converted to mains water supply.
It is recommended:-
A. To ensure that the mains water connection to
the appliance is the first connection from
the mains on entering the dwelling.
B. Where flow starvation is encountered that flow
restrictors or balancing valves are fitted
at supply outlets.
* The boiler has circulating pumps fitted therefore no
other is normally required. They are factory set at
maximum output.This setting should not be altered
on the domestic hot water pump as production of
domestic hot water may be adversely affected.
SYSTEM FILLING, TESTING AND MAKE-UP
Introduction
Mains cold water is supplied through the boiler
pipework to two separate circuits operating at different
pressures.
Circuit One
This is the Radiator Heating System including boiler
and primary tank which is filled from mains supply via
flex filling loop (see - Method A) within boiler to a
pressure determined from system static head,
expansion vessel size and system water volume. This
flexible filling loop should be disconnected when
boiler and system are filled and checked, See
diagrams - Method A & Method B).
Circuit Two
This is the domestic cold water supply through the
boiler plate heat exchanger via domestic hot water
pipework direct to hot taps. This works at full mains
pressure or if this is excessive at a reduced pressure
controlled by a mains pressure reducing valve to a
pressure acceptable to householder and satisfactory for
the correct operation of Combi C Boiler System.This
mains pressure reducing valve is not supplied with
boiler, but will be available from a local supply
merchant.
System filling should take place slowly and can
be done by either of the following methods:-
Manual Filling
The Firebird Combi C comes with this system built into
the appliance. It consists of a flexible hose connection
with a butterfly shut off valve at each end and a double
check valve assembly at boiler end. To conform to
requirements of BS 7074 Part I and local water Authority
Bye Laws, the flexible hose should be disconnected at
one end when filling has been completed and checked.
Two end caps are supplied and should be fitted to
disconnected ends as a safety precaution against
inadvertent opening of ball valves.
Pressure gauge on Control Panel should be checked
occasionally when system is cold. Refill to initial fill
pressure if necessary. Should this be a frequent
occurrence, complete system should be checked for
leaks.
Automatic Filling
Automatic System filling may be made with a feed and
make-up cistern connected through a double check
valve and stop valve assembly to the return side of the
heating system as close to the boiler as is practical.This
cistern should be located above the heating systems
highest point to give a minimum static head of 300 mm
between it (highest point) and cistern. The manual
filling system fitted to boiler should then be
disconnected and connection points blanked off.
This system has the advantage of automatic water
make-up in the event of system pressure loss due to air
elimination and minor leaks. In any case control panel
pressure gauge should be occasionally checked.
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