Heating And Hot Water System - Worcester 50/70 Installation And Servicing Instructions

Fig. 7. Oil Supply.
(a) Single pipe system
Oil tank
Sludge cock
(b) Double pipe system.
Oil tank
Sludge cock

9. Heating And Hot Water System

9.1 The appliance is suitable for connection to open vent or
sealed primary systems.
9.2 The appliance is suitable for connection to all conventional
indirect hot water systems utilising an indirect double feed cylinder.
9.3 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.
9.4 The appliance is supplied with an extra flow tapping to allow
a circulating pump to be mounted on the front face of the boiler.
This will allow the pump to be enclosed within the cabinet case.
Where this option is chosen the flow pipe can run either side of
the boiler. (See Fig. 2).
9.5 There is no requirement for a system bypass.
9.6 The pressure jet burner fitted to the appliance has full
automatic control and hence there is no requirement for heat
leak radiators.
9.7 Any unused boiler tappings should be plugged prior to
filling. It should be noted that the flow tapping on the front of the
boiler requires plugging when not used.
9.8 The primary system should be flushed and treated in
accordance with the recommendations of BS 7593:1992 before
the system is handed over to the user.
9.9 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.
Isolating
valve
Filter
Tank raised 1 in 24
(40 mm per metre)
Isolating
valve
Non return
valve
Filter
Tank raised 1 in 24
(40 mm per metre)
Wall
Fire valve to
BS 799 Part 2
Paper
element
oil filter
Non return
Wall
valve
Fire valve to
BS 799 Part 2
Paper
element
oil filter
Open Vent Primary System (See Figs. 8 and 9).
The following points are for guidance only. The system installation
should be carried out in accordance with BS 5449: Part 1.
1. Feed and Expansion System
The feed and expansion pipes must rise continuously from the
appliance and must be of the minimum diameter shown in Figs
8 and 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.
2. 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
The appliance is supplied with a manual reset high limit thermostat
and may therefore be fitted to a sealed heating system.
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.
8
Maximum oil level
Fire detection
element
Shut off
valve
Burner
Fire detection
element
Shut off
valve
Burner