SECTION 13: S
ERVICING
I
NSTRUCTIONS
43 of 54
SECTION 13: SERVICING INSTRUCTIONS
IMPORTANT
:
N
e
v
er
u
se the heater as a s
u
pport for
ladders or other access eq
u
ipment. Al
w
ays test for
gas so
u
ndness
w
ith a s
u
itable detection fl
u
id after
completing any ser
v
icing or exchange of gas carry-
ing component. On completion of any ser
v
ice/fa
u
lt
finding tasks
w
hich req
u
ire the breaking and remak-
ing of electrical connections, recheck the follo
w
ing:
A:Earth Contin
u
ity, B:Polarity and C:Resistance to
Earth.
13.1 Annual Service Procedure
Carry o
u
t the follo
w
ing ser
v
ice proced
u
re ann
u
ally.
The preferred time
w
o
u
ld be immediately before the
w
inter heating period. If
v
ery dirty conditions arise, it
may be necessary to carry o
u
t this proced
u
re more
often. If the
u
nit takes in air thro
u
gh an air d
u
ct or fil-
ter assembly, less freq
u
ent ser
v
ice may be neces-
sary.
13.1.1 Burner Removal
Isolate the heater from the gas and electrical s
u
p-
plies. Remo
v
e the pl
u
g from the b
u
rner. Remo
v
e the
t
w
o n
u
ts that sec
u
re the b
u
rner head to the comb
u
s-
tion chamber. The b
u
rner can no
w
be remo
v
ed.
13.1.2 Burner Maintenance
Remo
v
e the b
u
rner to the floor le
v
el and clean inter-
nally
u
sing a soft br
u
sh and compressed air if a
v
ail-
able. Take care not to damage the internal parts of
the b
u
rner. When remo
v
ing the b
u
rner, take care not
to dist
u
rb the gasket on the comb
u
stion chamber.
The electrode is an integral part of the b
u
rner head.
Check that the spark gap is approximately 3 mm.
13.1.3 Tube and Reflector Maintenance
With the b
u
rner remo
v
ed, clean the o
u
ter s
u
rfaces
of the t
u
bes
u
sing a br
u
sh and
w
ipe the inner s
u
r-
face of the reflector
w
ith a soft damp cloth -
u
se a
ho
u
sehold detergent if necessary.
N
e
v
er
u
se abra-
si
v
e cleaners on the reflectors. Reassemble the
b
u
rner in re
v
erse order. Carry o
u
t the Commission-
ing and Testing Proced
u
re
on Page 41, Section
12.3
.
13.2 Component Removal
Isolate the heater from the gas and electrical s
u
p-
plies. Remo
v
e the pl
u
g from the b
u
rner. Entry to the
b
u
rner assembly is gained by remo
v
ing the t
w
o door
scre
w
s and remo
v
ing the side co
v
er.
13.2.1 Electrode
13.2.2
The electrode is an integral part of the b
u
rner
head. Check that the spark gap is approximately 3
mm. Remo
v
e the electrode co
v
er and the t
w
o allen
scre
w
s that sec
u
re the electrode to the b
u
rner head.
Inspect the electrode gasket; replace as req
u
ired.
13.2.3 Injector Jet
When the side co
v
er is remo
v
ed completely, the
b
u
rner assembly is exposed. The jet is located in the
mixing block behind the pipe pl
u
g. Remo
v
e brass
injector jet (orifice). Replace in re
v
erse seq
u
ence.
13.2.4 Solenoid Valve/Governor
Remo
v
e the electrode co
v
er from the b
u
rner head
and
u
npl
u
g spark and sensor leads. Remo
v
e b
u
rner
head by
u
nscre
w
ing the t
w
o allen scre
w
s. Remo
v
e
the tagged
w
ires from the b
u
rner r
u
n neon. Remo
v
e
the cross-head scre
w
retaining the
v
al
v
e connection.
Cut/Pinch Hazard
Wear protective gear
during installation,
operation and service.
Edges are sharp.
WARNING
Failure to follow these instructions can result in death, electric shock, injury or property damage.
Burn Hazard
Allow heater to cool
before service.
Tubing may still be hot
after operation.
Explosion Hazard
Turn off gas supply to
heater before service.
DANGER
Electrical Shock Hazard
Disconnect electric
before service.
More than one
disconnect switch may
be required to
disconnect electric from
heater.
Heater must be
connected to a properly
grounded electrical
source.
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