COMBAT
®
C
ABINET
H
EATERS
I
NSTALLATION
, C
OMMISSIONING
, O
PERATION
AND
S
ERVICE
M
ANUAL
46 of 85
Fi
g
ure 20: Oil-Fired Heaters Control Box Se
q
uence
10.
8
.2 Se
q
uence of Operation
The operating seq
u
ence is as follo
w
s:
With the external controls on and calling for heat,
the b
u
rner fan and electric ignition
w
ill s
w
itch on.
After a comb
u
stion air p
u
rge of approximately t
w
el
v
e
seconds, the oil solenoid
v
al
v
e
w
ill open and the
b
u
rner
w
ill fire. After another fi
v
e seconds, the
electric ignition is t
u
rned off and the b
u
rner
w
ill go
into its normal r
u
n position. The photo cell
contin
u
o
u
sly monitors the safe presence of the
flame. When the temperat
u
re control is satisfied, the
control box
w
ill t
u
rn off all its o
u
tp
u
ts sim
u
ltaneo
u
sly
and ret
u
rn to the rest position for the beginning of
the next seq
u
ence.
10.
8
.3 Fault Conditions
If at any stage d
u
ring normal r
u
nning the photo
electric cell fails to detect the flame, the control
w
ill
s
w
itch off and make an instant restart attempt. If the
flame signal is still missing, "locko
u
t"
w
ill occ
u
r.
If the flame is not detected by the photo cell d
u
ring a
normal start, there
w
ill be no restart attempt and
"locko
u
t"
w
ill occ
u
r in approximately 17 seconds
after the start.
If a flame is detected d
u
ring the first 12 seconds
(p
u
rge), the solenoid
v
al
v
e
w
ill not open and the
control
w
ill "locko
u
t". For the control seq
u
ence,
see
Page 46, Figure 20
.
10.
8
.4 Switchin
g
On
T
u
rn on the heater
w
ith the external controls. (Heat
ON). If the "Locko
u
t Reset" b
u
tton is ill
u
minated,
press to reset. The comb
u
stion air fan and electric
ignition sho
u
ld
w
ork immediately. Vent the b
u
rner oil
p
u
mp at the same time by loosening the p
u
mp
v
ent
port (p
u
mp m
u
st be r
u
nning). If the b
u
rner goes into
"locko
u
t" before the p
u
mp has
v
ented,
w
ait one
min
u
te, then reset the control box and repeat
Section 10.8.4
u
ntil all the air has been
v
ented from
the p
u
mp and the b
u
rner fires.
NOTE:
The b
u
rner pl
u
g and socket may be
u
sed to
t
u
rn off the b
u
rner d
u
ring commissioning.
10.
8
.5 Blocked Flue
A safety de
v
ice
w
hich meas
u
res the comb
u
stion
chamber and fl
u
e is fitted on this heater. if the
press
u
re exeeds the factory set maxim
u
m press
u
re
limit, the heater
w
ill fail safe and pre
v
ent the b
u
rner
from firing. In the e
v
ent of this happening one
indicator lamp located on the front of the heater
w
ill
be ill
u
minated - This fa
u
lt sho
u
ld be in
v
estigated by
a competent person.
10.
8
.6 Adjust Burner Oil Pressure
Adj
u
st the b
u
rner oil press
u
re to the
v
al
u
e in the
data table for the b
u
rner reference letter and b
u
rner
man
u
fact
u
rer's information for details of the b
u
rner
oil p
u
mp. When completed, t
u
rn off b
u
rner and
remo
v
e test ga
u
ge and refit pl
u
g.
10.
8
.7 Set Combustion Air
The comb
u
stion air m
u
st be set. Meas
u
re the
emissions in the fl
u
e at a point
w
ithin one metre from
the o
u
tlet of the heater and adj
u
st for the highest
carbon dioxide (CO2) le
v
els obtainable,
u
s
u
ally 10.5
- 11.0%,
w
hile making little or no smoke (smoke
n
u
mber 0-1). The test m
u
st be carried o
u
t
w
ith all
co
v
ers fitted and after the heater has been r
u
nning
for 15 min
u
tes.
10.
8
.
8
Complete the Commissionin
g
Test the b
u
rner for correct start and stop operation
se
v
eral times. Check that all safety de
v
ices operate
Al
w
ays disconnect the po
w
er s
u
pply before installing or remo
v
ing the control
u
nit. Do not
attempt to open or carry o
u
t repairs on the control
u
nit.
Summary of Contents for Combat MGB0100
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Page 7: ...1 of 85 Product Approval ...
Page 91: ...SECTION 16 SPARE PARTS LIST 85 of 85 ...
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