Electrical - Worcester DANESMOOR 15/19 Installation And Servicing Instructions

Sealed Primary System
The appliance is supplied with a manual reset thermostat and is
suitable for use with a sealed primary 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.

10. Electrical

(See Figs. 14 to 20).
10.1 The wiring between the appliance and the electrical supply
shall comply with current IEE Wiring Regulations and any local
regulations which apply.
10.2 To gain access to the electrical terminal strip.
1. Isolate the mains electrical supply.
2. Remove the cabinet top panel by snatching squarely
upwards.
3. Release the four screws securing the cover of the
electrical control box and remove.
10.3 Mains Wiring
Mains supply – 230/240 V AC ~ 50 Hz 5A External Fuse.
LIVE - Brown, NEUTRAL - Blue, EARTH - Green/Yellow
Mains Cable: 0.75mm 2 (24 x 0.20 mm) to BS 6500 Table 16.
The method of connection to the appliance must allow complete
isolation of the appliance, preferably via a double pole isolator
with a contact separation of 3 mm in all poles supplying the
boiler and controls only.
The mains supply cable should be connected into the terminals
marked L (Live), N (Neutral) and E (Earth) on the appliance
terminal strip and securely held in the cable clamp located in
the left-hand side of the electrical tray base. To secure the cable,
remove the clamp retaining screw and pull its inner body out to
allow the cable to be fed through. With the cable in position refit
the screw and fully tighten to grip the cable. Feed the cable
between the side panel and the boiler insulation jacket and
route to the connection point avoiding any hot surfaces.
The appliance must be earthed.
10.4 Programmer
(See Fig. 15).
A plug in, colour co-ordinated, 2 channel electronic programmer
is available from Worcester Heat Systems Limited. Full
instructions covering installation and operation of the
programmer are included with the kit. (See Fig. 15a)
The programmer will give fully independent central heating (CH)
and hot water (HW) programmes when the switch on the rear of
the unit is set to P.
Where the appliance is used on a gravity feed system the
system will only function correctly on heating if the programmer
switches the hot water programme on at the same time. To
ensure that this is always the case the programmer is supplied
with a gravity system switch on the rear of the unit which must
be set to G.
If an external programmer is to be fitted to the boiler the link
plug should be removed from the programmer terminal strip.
(See Fig. 15b). The LIVE, NEUTRAL and EARTH wires should be
connected to the LIVE, NEUTRAL and EARTH terminals on the
main terminal strip and the switched lines connected to
terminals 1 and 2. Alternatively, the LIVE, NEUTRAL and EARTH
from the programmer may be connected to a separate live
supply with the switched lines again connected to terminals 1
and 2. With this method it is important that the user is warned
that both the boiler supply and the programmer supply must be
switched off before the electrical cover is removed.
Note: The mains supply cable should not be connected to an
external time switch when a frost thermostat or low-level
discharge post purge unit is fitted to the Danesmoor standard
wiring block.
10.5 Safety Check
In the event of an electrical fault after the installation of the
appliance, the electrical system shall be checked for short
circuits, fuse failure or incorrect polarity of connections.
10.6 Basic Control (Room Thermostat)
(See Fig. 16).
As supplied the boiler will give a gravity hot water output when
HW is selected or a pumped heating circuit and gravity hot
water supply when CH and HW is selected. The hot water and
central heating temperature is controlled by the boiler control
thermostat. Additional control may be obtained by the use of a
room thermostat, having removed the link from terminal 2 to 4.
10.7 Off On No Demand (Room and Cylinder Thermostat)
(See Fig. 17).
This control system allows the boiler to cool when both the
cylinder and room thermostats are de-energised. The boiler con-
trol thermostat must be set to a temperature above that of the
cylinder thermostat for the control system to function correctly.
10.8 Honeywell "S" Plan
(See Fig. 18).
The "S" plan provides complete control on installations having
pumped circulation to both the domestic hot water and radiator
circuits.
The domestic hot water and radiator circuits are independently
controlled by two motorised valves via a cylinder thermostat
and a room thermostat. Both thermostats switch the water
circulator and the boiler on and off.
10.9 Honeywell "Y" Plan
(See Fig. 19).
The "Y" Plan provides complete control on installations having
pumped circulation to both the domestic hot water cylinder and
radiator circuits.
The domestic hot water and radiator circuits are controlled by a
3 port motorised valve via a cylinder thermostat and a room
thermostat. Water flow is diverted to either circuit or to both
circuits at the same time. Both thermostats switch the water
circulator and the boiler on and off.
Note: The "Y" plan requires a live feed from the hot water "off"
switch position. In order to achieve this, using a WHS
programmer, remove the orange wire from terminal 9 and pull
back through the tie wraps. Do not attempt to cut the tie wraps.
Ensure that the brown wire is firmly secured in terminal 9.
Connect the orange wire to terminal 6.
10.10 Frost Protection
(See Fig. 20).
For full frost protection a single pole double switch thermostat
should be fitted so that both the boiler and the circulating pump
circuits are energised under frost conditions. A suitable frost
thermostat is manufactured by SOPAC Ltd.
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