Milnor 72072, Manual

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È GAS AND AIR ADJUSTMENTS FOR 72072 GAS DRYERS
Ê Required Kits
Ad
justment
proc
edures
require manome
ter kits
KWGP
030100 and KWGP150100 (available from the
MIL
NOR
factory)
or equiv
a
lent
equipme
n
t.
Each kit
in
clud
es
a
d
iffere
n
tial
pressur
e
gau
ge, f
itt
ings,
and
tub
ing.
Ê Abo
u
t the F
lame
C
o
ntrol
Fl
ame co
n
trol
provides both fla
m
e
and
ignit
ion
safeguards.
Aft
er
fire
is desi
red by the
mi
croproces
sor,
thes
e devic
es
check tha
t
al
l
safety
swi
tches
are
made,
then
swi
tch
on
pi
lot gas, spark igniti
on, and ma
in gas.
Whil
e the burner i
s l
it, the fl
ame co
n
trol monitors the fla
m
e rod vol
tage,
and
if
that volt
age
drops below
the
set
point,
the pilot and
main gas
v
alves
turn off.
Ë Ide
n
tif
y
ing
the T
y
pe o
f Flame Co
ntr
o
l
—MI
L
N
O
R dr
ye
rs
are suppl
ied
st
andard
wi
th
a “
F
ireye”
fl
am
e safety
control,
or
optionally
with
a
“Landis
and Gyr” control, where
required by local code. The type
of fla
me contr
ol s
upplied must be dete
rmined before
any gas and air ad
-
jus
tm
ents
are made.
Ë How the
Fireye Flame Control
Work
—After
loading i
s complet
e, the
dryer
contr
ol
turns
on
the
Main
and
Combus
tion Air blowers, then calls
for fi
re. If al
l safety require
ment
s
are sa
ti
sfied, po
wer i
s
provided
to
the
Fi
reye flam
e control. The fla
me control opens the
P
ilo
t Gas valve and powers the
spark
ignitio
n for a maxi
mum of
10
seconds. When the
pi
lot
fl
ame is
sensed by the
fl
ame control,
the
flame control
turns
off the
spark
ignit
ion and
turns on the
Main Gas valve. If the
pilot flam
e i
s not detec
ted af
ter 10 seconds, the
flame cont
rol turns off
the
Pilot
Gas
valve and the
spark ignit
ion, then locks
out.
This
lock out energiz
es the
Fi
re
Eye
Tripped r
el
ay,
then
il
luminates
the
FIR
E
EYE
TR
IP
PED
st
atu
s
light. W
ait
two
minutes, then pus
h Safety
R
eset
(FIGURES
1 and
2), Fi
reye
F
lam
e
Cont
rol R
eset
(FIGU
RE 3),
and the
S
ignal
Cancel button
on
the
dryer
control panel to
clear the error.
Observe
th
e
flame control
lamps during the
resta
rt. If
the
fl
ame con
-
trol
fails to
auto
ma
tica
lly
re
set,
pre
ss
Fi
reye
R
eset
im
media
tely after the Opera
-
to
r co
ntrol
la
mp
illu
minate
s
(b
e
fore
the
alarm
lamp
il
lum
inat
es).
Any other
error
s
illuminate
the
FI
RE
EYE NOT
ALLOWE
D status
light
and
the
relat
ed error
st
atu
s
light. Push Safety R
eset
and Signal C
ancel to clear these errors.
Ë How the
Landis and
Gyr
Flame
Control Work
—Aft
e
r
the dryer
is
loaded, the
dryer
control se
ts
th
e Modulat
ing
Gas
valve
to
the
minimum fire posi
tion and tel
ls
the fl
ame co
n
trol that f
ire is des
ired. The
flam
e
co
n
trol turns on th
e
Main and Com
bustion Air
motor
co
n
tactors,
checks tha
t
al
l
safety
req
u
iremen
ts
are
sat
isf
ied, then turns
on the spark
igni
tion and opens the
pilot gas
valve.
After
th
e
Pilo
t valves are
opened
and
the
fl
ame co
n
trol
receives an
input from
th
e
flame
rod,
it
opens the
Main Gas valve. If the p
ilo
t f
lame
or any safety i
s not sat
is
fied, the
flam
e
control locks out. The lock
out trips the fire eye
relay a
nd il
lumi
n
ates the
FIR
E
EYE TR
IP
PED
status
light. Push either the
Safety Re
set (FIG
URE
1)
or
Fla
m
e
Contr
ol
Rese
t
(FIGUR
E 4), and Si
gnal
C
ancel
to
cl
ear any
errors.
Ê Changing the Temperature
Probe
Do
not bend the
temperature
probe if
it
m
ust
b
e
removed.
Remove probe
by unscrewing pipe
bush
-
ing “A”
fi
rst, then uns
crewing clam
p
nut
“B
”
(F
IG
-
URE 5).
Î FIG
U
RE 1
(MS
S
M0
137AE)
Î Loc
a
tion
of
Eme
rgen
c
y Stops,
Ga
s
Trai
n
, S
a
fe
ty
Re
se
t,
a
n
d
Fl
am
e Control
Î FIG
U
RE 2
(MS
S
M0
137AE)
Î Em
er
gency Stop and
Sa
fety
Re
se
t
Î FIG
U
RE 3
(MS
S
M0
137AE)
Î Fir
e
ye Flame
Cont
rol R
e
s
e
t
Î FIG
U
RE 4
(MS
S
M0
137AE)
Î La
ndi
s
a
n
d
Gy
r F
lame
Control
Res
e
t
Î FIG
U
RE 5
(MS
S
M0
137AE)
Î Te
mper
a
ture Pr
o
b
e Re
mov
al
94