Heating And Hot Water System; Electrical - Worcester DANESMOOR FS12/18 Installation And Servicing Instructions

Fig. 14. System filling and make-up

9. Heating and Hot Water System

The heating and hot water system must be provided in accor-
dance with the current Building Regulations.
9.1 The appliance is suitable for connection to all conventional
indirect hot water systems utilising an indirect double feed
cylinder.
9.2 The flow and return sockets are located at the rear of the
appliance, two at high level (flow) and two at low level (return).
Connection of the flow and return sockets can either be made on
diagonally opposite sockets or on the same side of the boiler.
9.3 Provision has been made for locating the circulating pump
within the appliance cabinet. If required, the socket located on
the top of the boiler should be used and the flow pipe run to the
right hand side of the boiler (See Fig. 2).
9.4 On new installations a room thermostat or programmable
room thermostat is used in the main zone and thermostatic
radiator valves used in heating zones.
On existing systems where a room thermostat is already fitted it
is necessary to fit thermostatic radiator valves at least in the
sleeping zones.
An automatic system bypass should be fitted on heating sys-
tems when all of the radiators are fitted with thermostatic radi-
ator valves.
9.5 The pressure jet burner fitted to the appliance has full
automatic control and hence there is no requirement for heat
leak radiators.
9.6 Any unused boiler tappings must be plugged prior to filling.
It should be noted that the flow tapping on top of the boiler
requires plugging when not used.
9.7 The primary system should be flushed and treated in
accordance with the recommendations of BS 7593 before the
system is handed over to the user.
9.8 The pump should be set in accordance with the heating load
requirements to give a flow and return differential temperature
of 11°C under full load conditions.
Open Vent Primary System.
(See Fig.9, 11 and 13).
The following points are for guidance only. The system
installation should be carried out in accordance with BS 5449:
Part 1.
System Pipework
1.
The first metre of pipework from all appliance connections must
be in copper; afterwards copper or plastic pipe can be used. The
plastic pipe must be manufactured to BS 7291 and installed to
BS 5955 part 8. It is important to protect the system
Temporary
hose
METHOD 1
Auto air
vent
Heating
return
components; the plastic pipe specified must be resistant to the
ingress of oxygen.
2. Feed and Expansion System
The feed and expansion pipes must rise continuously from the
appliance and must be of the minimum diameter shown in Fig. 9.
The cistern must be arranged to provide a minimum static head
of 1 metre above the top of the highest point in the heating
circuit.
3. Filling and Venting
Air in the appliance is expelled through the vent pipe or
dissipated into the system. Manual air vents should be fitted at
any high points in the system.
Sealed Primary System
(See Fig. 10 and 12 )
The appliance is supplied with a manual reset thermostat and is
suitable for use with a sealed primary system.
System Pipework
1.
Copper pipework must be used when installing the appliance on
a sealed system.
2. General
The system should be installed in compliance with the
requirements of BS5449: Part 1. The boiler must be fitted with a
spring loaded safety valve set to operate at 3 bar (45 psi) and
the pipe connections made throughout the system must be
capable of sustaining a pressure of up to 3 bar.
The following is a list of major items which must be fitted to the
system:
1. Safety valve – 3 bar
2. Pressure gauge – 0 to 4 bar.
3. Expansion vessel
4. Automatic air vent.
(See Fig. 15).
10.1 The wiring between the appliance and the electrical supply
shall comply with current IEE wiring regulations (and any local
regulations which apply) for fixed wiring to a stationary appliance.
NOTE: It must be possible to completely isolate the appliance.
10.2 To gain access to the electrical terminal strip.
a) Isolate the mains electrical supply.
b) Remove the cabinet top panel and the front panel as
14
Make up
vessel
Non return
valve
300mm (12in) min.
above highest
point of the system
Stop
cock
Fill point.
Heating return
METHOD 2

10. Electrical