Worcester 280 RSF Operation instructions

...---~~~ORCESTER----.
Bosch Thermotechnik
280 RSF
WALL MOUNTED COMBINATION BOILER FOR CENTRAL HEATING
AND MAINS FED DOMESTIC HOT WATER
USERS OPERATING
INSTRUCTIONS
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IMPORTANT : THIS APPLIANCE IS FOR USE WITH NATURAL GAS ONLY
THESE INSTRUCTIONS APPLY TN THE UK ONLY
THESE I NSTR UCTIONS ARE TO BE LEFT WITH THE USER OR AT THE GAS METER

General Description
The Worcester 280 RS Fis a comb in a ti on b oile r supplying mai ns
fed domestic hot water plus central he<J ti ng at an output of
betw ~ ~n 10.5 and 24 kw.
HOT WATER PROVISION
When a tap is turned on, the burner will li ght and ho t water w ill
become ava il able in a continuous supply at <l constant tempera·
ture (after a short del ay) depending on when the app li an ce was
last
fi red.
CENTRAL HEATING PROVISION
Whe n a demand is made for centra!heating the bu rn er wi ll l ig ht
and the app lia nce will automa ti ca ll y match output to the syst em
load. If the sy5tem requires less than 10.5 kW, the burner will
light only peri od ic ally to maintain system temperature.
CENTRAL HEATING AND HOT WATER PROVISION
Ho t w.;Jter wi ll take p riori ty overthe supplyof heat to the centr al
heati ng syst em .
User Controls
The Wor cester 280 RSF is fitted wi th an op erating Swi tch (or
optional electronic programmer) which is fitted on the facia
pa nel and controls thedomestic hot water and centra!hea ti ng .
OPERATING SWITCH
Th e sw itch o ff ers the foll o wing positions:
WATE'.R Domestic hot wa t er will be provld ed
when a tap or showeris turned on.
OFF Central heating and domes ti c hot water
remain
off .
HEATING & WATER Cen tral heatine will operate in respon se to
system cont ro ls and domest ic hot water
will be supplied when a tap or shower is
turned on .
ELECTRONIC PROGRAMMER
Iftheop ti onalelectronic pr ogrammerhasbeen fitt e<l refe r to the
Ope ra ting lnstmctions supplied wi th the programmer.
CENTRAL HEATING TEMPERATIJRE CONTROL
The Cental Heating Temperature Co nt rol Knob on the fac ia pan el
allows control of the watertemperature to the ra diators.
INDICATOR LIGHTS
The STANDBY (amber) light indi c<Jtes that t he malns el ectricity
lo the appliance
is on. The DE MAND (green) light indicat es that
th e a pp liance is su ppl yi ng either domestic hot water or ce ntr al
hea ti ng .
PRESSURE GAUGE {sealed systems only}
The green needle has been set to show the sealed system pres·
sure which
is re quired for the appliance to operate effe ctively.
The white needle will s how the act ual pressure in your system.
Openvent system
If your installer has fitted an open
ve nt system he will te ll you.
The white needle ort the pressure ga u ge will always point to
zero.
Hot Water Temperature Control
By slightly reduc in g the flow ofdomes ti c hot water fr om the tap,
the temperature of the water will increase. This is of pa rti cu lar
advantage in the w in ter, for ex a mple to in crease bath water tern·
perature and to remove heavy grease dep osi ts on plates, etc.
Al~o this will provide an added advantage of re ducing the delay
before hot water is obtained.
The maximum dischar
ge temperature of hot water to the taps is
preset at t he factory.
To Light and Stop the Appliance
TO UGHT THE APPLIA N CE
set the Operating Switch (o r programmer) to OFF . Swit ch off the
electricity supply. Your installer
wjll have tur ne d on the gas sup ·
pl yat thegas se rv ice valve.
Yo ur in sta ll er will have cheked that the water valves to the cen·
tral heating supply are open. Check that the wh it e needle on the
pressure
gu<~ge is not below the req ui red pressure as shown by
thegreen needle (sealed systems unly }.
Swi tch on the mai ns electri ci t y, indicated by the ST ANBY ligh t.
Pull down the pl asti<: fa ci i:l cover am! turn Central Heati ng
Temperature Co ntrol Knob to max .Set the Operati ng Switch (o r
programm
er) to HEATING & WATER and the burner wil! li ght.
Th e burner flame is visible through the observation window
which
is accessible by removi ng the cabinet front panel. The
fr ont pa n ~ l i~ removed by pull ing forwards and lifting off .
Set the Operating
Switch (or programmer) to the required posi·
tion.
Set the room thermostat ( if fit ted)to thedesired temperature.
Se t the Central Heating Temperature Control Knob to the requir·
ed position.
TO STOP THE APPLIANCE
ForShort Periods
Set th e Operating Switch (orprogrammer) to OFF .
Fo r Long Periods
Set. the Ope rating Switch (o r programmer) to OFF . Swi tch off the
mai
ns electricity. The ST ANDB'r' lig ht will go out.
Th e facia m ou nted programmer will retain its settings tor about
four weeks after which it
will return to the factory set pro·
gramme.
The display w ill disappear after approx. 12 hours.
OVERHEAT THERMOSTAT
An overheat thermostat is fitted lu the appliance which inter·
rupts the electricity supply in the event of overheating. Fo r
access to the overheat thermostat remove the front panel by
pulling forwards and lifting
off . The thermostat is rese t manually.
If the appliance fa ils to lig ht. check that the overheat thermostat
has not operated by pressi ng the reset overheat thermostat
reset button.
If the overheat t hcr m os la ~ stops the ap pl iance
again call a service engineer.
System Operation
SEALED WATER SYSTEM
To ensure that the appliance operates correctly, a min imum
water operattng pressure m
us t be ma intained. The mmimum
pressu re is indicated by the green needle on the pressure gauge
located
on the fac ia pane l. If the pressure falls (M shnwn by the
white needl
e) the system must be re·pressurised by your
ins t alle r. Con tact your installer or <l maintenance engineer if the
system continues to lose pressure as this may
in d ic<Jte aleak.
CENTRAL HEATING SYSTEM
Ounng the fi rst operation of the central heat ing syst em check
thatall radiators are evenly heated.
lft he top ofthe radiat or is at
a lower temperature than the bottom. vent it
by releasi ng air
through the
ven t screw at the top of each radiator. Excessive
venting may cause
1.1 drop in t he system pressure (see previous
pa ragraph).
FLUE OPERATIO N
In cold weather. vapo• Jr may be em itted from l he flue . Th is is a
normal opera tin g characteristic and no remed ia laction is neces·
sa ry.

Installation
CLEARANCES
Space h as been pro vid ed around the applfance for safety and
servici ng . It is i mp ortant that you do not restrict this sp ace .
The minim um clea rances are:
Left hand si de - 5 mm. Right hand side - 5 mm.
Top (above the flue bend}·· 25 mm . Below 200mm
In fr
on t - 600 mm .
VENTILATION
Ven t ila ti on openings pr o vi d ed by the i nsta ller in a wa ll or door
must not be
bl ocked.
fLUE TERMINAL
t he flue terminal in the outside wall must not be obstructed or
damaged.
System Fitting
SERVICE
Regu lar servici ng will mainta in e ffi ci ency .: md prolong the life of
your applian
ce . Wor cester Heat syste ms oryour Gas R egi on can
offer service co ntracts for th e ma intenan ce of your ap pl iance.
CLEANING
Use a damp cl ot h and a li ttle detergent. Do not use abrasive
cle aners on the cas in g.
FROST PRECAUTIONS
The appliance has a built-in frost thermostat w hi ch will operate
duri ng periods of low temperatu re (day or n ight} al th ough the
Operati ng Sw itch (or Programmer)is in the OFF position.
Yo ur installer may also fit a remote frost thermostat if parts of
t
he system are exposed toexceptiona ll y lo wtemperatures.
If the appliance is not to be used for lo ng pe r iods dur ing co ld
weat l1 er then the appliance and the central heating system
should be
dr ained.
Fig. 1.
Sig ht glass (behindfr ont pan el)
!
.. .
' •• ,J
OPEN INSTALLATION
Do not pl a ce a ny co mb us ti ble mate ri al on or around the a ppli ·
a nce .
CUPBOARD INSTA L LATION
If th e appliance is fi tt ed in a cupboard and the c up board is to be
use d for stora ge (as in an ai rtng cupboard for clothes) t he a ir i ng
space must be separated from the boiler and flue so that no
co mb ust ible material may come into contact with the applia nc e
or the flue . Do not restrict any permanent air vent wh ic h may
have been provided .
Co nsult your G as Reg i on or Worcester He at Systems f or advi ce
shou ld yo u wish to lit acompartment around th eappliance a ft er
insta
ll ati on .
USE IN HARD WATER AREAS
The appliance has been des i gne d to ov ercome scale accumula
tion
in most normal con ditions. How ev er . in exceptionally hard
water a
reas a desca le r can be fi tt ed to assistin the preven ti on of
scale formation.
ROOM THERMOSTAT
A mains vol tage room thermostat should be fi tted for impr oved
control of the room tem p€!rature .
THERMOSTATIC RADIATOR VALVES
The rmostatic radiat or valv es fi tt ed to your central heating sys-
tem m ust co nfo rm Lo BS2767.10.
SHOWERS , BIDETS, TAPS AND MIXING VALVES
Taps and mixing va lves must be suitable for operating at a
mains pressu re of up to 1Obar. Thermostatically co ntro ll ed or
pressure equa
lising shower valves will give clddcd comfort and
safeguard against
f!Xr.ess i ve temperatures. Hot and co ld mains
fed water can be supplied direct to
an over-rim flus hi ng bidet
subject
to local Wa ter Co mpany requ ir ements. A loose-head
sh o we r hose must be fixe d so as to stop the sho we r head com·
ingwit
hi n 25 mm of t he top ed ge ofthe bath.
O
verhe at therm ost at res e1 bu tto n
ry Indi cat orligh ts Amb er- Stan db y
t---------- ~ Gr ee n- D eman d
~ -- ~ · -··-
1 [·~ C en tr e! he at i ng te m pe ra tur e con trol
[_... =:_ ? 1 j! 'Q; ~~ C en tra l h eat i ng s ys t em pressure gaug e
~·~-----= == =:=:=::::;;;::;;;;;;; - Operating Sw itch (or pro g ra mmer)
L__ Gas s erv ice co ck

Mains Service Interruptions
GAS LEAK
If you suspect a gas leak, turn o ff th e gas supply to the a pp lia nce
and call your l oc al Gas Region. Do not operate any electrical
switches
WATER MAINS FAILURE
In the event of mains water supp ly failure dom e~{ir. hot water
w ill not be availab le from t he appliance. However, the c en tral
heating w
ill continue to ope rate. If t he appliance is fi tted to an
open
ve nt sys tem thenthere must ;;~ l ways be wa t er in the make- up
tank for safe operation.
ELECTRICITY SUPPLY FAILURE
If the electricity sup ply fa ils the appliance wi ll not operate. Once
the supply is restored the app l ian ce will return to n orm al opera-
tion. Tf a progr ammer is fitted,check that t he se uin gs have been
ma intained.
Appliance Fault
It a fault occurs, turn off the appliance and fo ll ow th e instruc·
ti ons as de ta iled in paragra ph 'To sto p the appliance for long
periods'.
To Connect a Plug
The colour of the wires of th e mains lead of the ap pliance may
n ot correspo nd wi thth e coloured ma rkings identifying the termi·
nals in your plug. In t hi s case proceed as follows:
The wire coloured green and ye ll ow m us t be conne <: t ed to the
terminal on the plug
that is ma rked w it h the letter E, or by the
eart h sy mb ol -t.orcolouredgreen orgreen and yellow.
The
blue wire must be con n ecte d to the te rminal wh i ch is
marked w
it h either the letter N or coloured bl ac k.
T
he br o wn wire m us t be conne cted to the ter mina l wh ic h is
marked wi
th th e Jetter Lor coloured red.
Electricity Su pply: 240V- , SO Hz, 270 wat ts. Fuse at 3A.
Mandatory Requirements
GAS SAFETY (INSTALLATION AND USE) REGULATIONS
1984 :
All gas appliances must be installed by a competent person
in accordance wi th the above regulations. Failure to install
appliances correctly could lead to prosecution . The manu1ac·
turers notes must not be taken, in any way. as over·riding
statutory obligations.
IMPORTANT
This appliance must be ea rthed and protected by a 3A fuse if a
1 3A plug is used. If any othert ype of plug is u se d a SA fuse mus t
be fitted in the pl ug or adaptor or at tile distribution board.
~~~ORCESTER
Bosch Thermotechnik
W llft:OS!er H<:aiSy-,;IC>"lS LJrrllted, Ca !sw a !d Wuy. Wc :>rrfdl)ll, Wf)[CP..<Cer ~4 9S W.
Te!ephune, (0190SJ 1 5462 4 F"x ' (01905i 7 54619
T)u s booklet is accurate at thc:~ cl<lt P. of printingbut will besuperseded and sho1.1ld. be disreg<~rdcd if specifications and / or cJppet~r;,nc~ are changed in th e interests
of co n tmued improvemen t.
All goods sold ar~ . ~ ubJe< ! toour official C:ondil ion~ . of Sale. a copy ol which may be obtai ned onapphr. .a lion.
PUBllCATION ZKLIT785, I SSUE 4 - AUGUST 19 95