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It is good wiring practice that the supply to the unit
should be via a two pole disconnection providing at least
3mm air gap.
Line voltage applied to terminals 3 and 4 when the
programmer is in the ON position for HW and CH and to
terminals 1 and 2 when it is in the OFF position.Terminals
N, L, 1, 2, 3 and 4 connect the controls for domestic hot
water and central heating applications. (See Figs. 3, 4 and 5).
The programmers are factory set to give 10 combinations
of HW and CH, the 10 programme position is normally
used when the hot water is on a gravity system. In this
case it is not possible to have CH without HW (See Fig. 3
for wiring diagram). If 16 programmes are required then
refer to programme selection. (Fig. 6).
The 16 programme position is normally used on a fully
pumped system using 2 or 3 port valves, thus allowing
independent control of HW and CH. (See Figs. 4 and 5 for
wiring diagrams).
NOTE: All external wiring must comply with current IEE
regulations. Wiring of this unit should be carried out by a
qualified electrician. Whilst every effort is made to ensure
accuracy of the instructions given, you will appreciate
that discrepancies may occur due to a variety of reasons
outside our control. If, after wiring your system, you find
that it does not work properly you should:-
• Check that you have used the correct system
and wired it correctly.
• Ensure no wiring links have been missed and
all screws are tight.
• Check with Landis & Staefa - there may be a
simple explanation.
Technical Helpline:-
01952 602048 – Monday to Friday 9am - 5pm.
NB: This unit must not be used for control of immersion
heaters.
Programmer range selectors
This programmer is supplied in the 10 position mode
suitable for the system as in Fig. 3. When using systems
shown in Figs. 4 and 5 you should carry out the following:
1. Selector sliders must be in the following position:
HW - OFF
CH - OFF
2. Insert a small, flat bladed screwdriver into the
square opening with the flat end horizontal, then
push fully up to the top of the slot opening.
3. Also move switch from 10 to 16 position, i.e. from
left to right.
Fig 6.
Fitting the Unit to the Backplate
Tilt the bottom of the case away from the wall, locate the
two slots in the top of the case over the two tabs at the
top of the backplate. Push the bottom of the case towards
the wall, slotting the two backplate screws into the
bottom of the case, and tighten the screws.This enables
the contacts in the unit to engage with those in the
backplate.
INSTALLATION AND USER INSTRUCTIONS - RWB2
Technical Data RWB2
Supply:
Frequency:
Contact rating:
Switching voltage:
Ambient temperature range: 0 to 30°C
Environmental humidity:
Housing:
Safety Standard:
Pumped Central Heating with Gravity Hot Water
RWB2 BACKPLATE
Fig 3.
Mid-position System
RWB2 BACKPLATE
Fig 4.
Zone Valve System
RWB2 BACKPLATE
Fig 5.
200/240V 50Hz
50Hz
6A (resistive)
2A (inductive)
24 to 240V
90% RH
ABS resistant to fire
as EN60730 standard
Conforms to EN60730,
Class A for use in normal
pollution situation.
PAGE 2
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