Chapter 2. Safety
PELLERIN MILNOR CORPORATION
Table 1: Fire Safety Functions for 6458xxxx and 7272xxxx Dryer Models
Sensor type
Temperature switch
(closes at specified temperature)
Thermocouple
(gives continuous temperature data to the controller)
Sensor name
ST225-1 & 2
ST550A & B
STBB
T3
Location
Basket/outlet
duct (Figures 1,
3, 4)
Inlet duct
(Figures 1, 2)
At burner
(Figures 1
and 5)
Outlet duct (Figure 3)
–Three safety limits in software–
Safety limit
(the
temperature
or condition
that causes the
given result)
225° F (107° C)
550° F (288°
C)
175° F
(79° C)
5° F increase for
15 seconds or 15°
F increase for 5
seconds during
min fire*
Higher than 220°
F (104° C) for 5
seconds**
240°F (116°C)
Occurs when
temperature is
too high
Water flows and
all dryer
functions stop.
Flame goes off. If the flame
will not come on, see the
line below this one.
Each step before the cooldown is
subsequently cancelled while the
condition continues.
Water flows and
all dryer functions
stop.
Display when
temperature is
too high
THREE WIRE
DISABLED error
and operator
alarm
Initially none. If the flame
will not come on, the
CHECK ERROR LIGHTS
error and operator alarm
occur.
The controller
shows “MINF”
and puts data in
the record of dry
cycle details
The controller
shows “>220”
and puts data in
the record of dry
cycle details
OUTLET TEMP
EXCEEDED 240
Df - POWER
DOWN error
and operator
alarm
Necessary
procedure
See
Section 2.2.5
“If Water Flow
Occurs”
If the error given in the line
above this one occurs,
see“Error Messages” in the
operator guide.
See
Section 2.2.2 “About the
Min
Fire
and
Outlet Temperature
Exceeded 220°
Faults”
See
Section 2.2.5
“If Water Flow
Occurs”
* This does not apply to steam dryers
** This does not apply to steam dryers if they do not use modulation.
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