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I
Opeflting Switdl and
room thermostil
on.
Frost
tllermotllt
on.
EITHER
Centnl heating
Demand.
End
of domeslic hot
Wiler
Demlnd.
DEMAND
indicllllr
illwninlled.
Mlins
ga
IVIillble
1
7. Operational Flow Diagrams
Note.
The alpha references in these charts are to
be
used
for
cross·
referencing when fau
lt
finding
.
See
Section
18.
Primlry
Wiler
temperllllle.
monitored by
centl'll
helling sensor
II
temperltwt
B
umer
pmswe
11
--
H
manito~
by
centrll
2.2
mblr lor
two
hNting
sensor.
minutes.
Mlin
gas valve
off.
rJ
Bumer~
incrtlseS
from
2.2
mblr
to
the set level
over a
one
minute period.
m
Central
helling
temperlblrt
IbM set
IML
m
Hut
input~
I
I
to
llllintiin flow
temperlblre
set by
T
emperllllle Control
Potentiometet
1. Central Heating Mode.
1:1
1!1
..
.:..
Repeltedly
Depress
press
red
After
20
seconds slowly
ga
ignUr
button
1-----.
releae
ga
valve button
Pilot tllme
valve
until
pilot
(30
seconds
f
tlime his
FLAME
estJblished
button
fllme
is
pmiously extinguished)
CONTINUES
observed
t
FLAME
EX11NCUISI!ED
-~·l
wu
lor
3
minutes?
~
button
In
the
directional
theii'IOW
Openlina
S
will:h oH
.
EITHER
I
I
I
~
Ll~
DEMAND
illdicJtor
elf.
Mlin
gas valve
off.
Pump
off,
or
COIIIinue
~
pump~
ls
requlrld.
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