Milnor 7272TG1L, Установка и обслуживание

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Fire Safety System Operation and Maintenance
PELLERIN MILNOR CORPORATION
BIPDUM01 (Published) Book specs- Dates: 20071029 / 20071029 / 20071029 Lang: ENG01 Applic: PDU
Fire Safety System Operation and Maintenance
Notice 1 : If your sprinkler just actuated (water is pouring from rear of dryer) —go
to Section 5 “What to Do If the Sprinkler Actuates” .
This document replaces documents MSTS0105AE “Dryer Temperature Safety Limits” and
MSSM0126AE “About the Automatic Water Sprinkler” for dryer models 50040xxx, 58040xxx,
6458xxxx and 7272xxxx.
The fire safety system includes the controls that handle various fire safety functions and the
internal sprinkler that can suppress a fire in the basket. The controls automatically invoke actions
intended to prevent or suppress fires. The sprinkler will actuate automatically as explained in
Section 1 “Controller Fire Safety Functions” . It can also be actuated manually, either by pulling
the actuation handle on the sprinkler valve assembly or by actuating it from the control panel, as
explained in
Section 4 “How to Test the Sprinkler (monthly or every 200 hours)” . Once
actuated, the sprinkler will spray water onto the dryer basket and the water will enter the basket
through the perforations. The sprinkler assembly must be routinely tested and properly
maintained to ensure that it functions effectively, in case it is ever needed to suppress a basket
fire.
1.
Controller Fire Safety Functions
Fire safety functions and components for 6458xxxx and 7272xxxx dryer models are described in
this section. Those for 50040xxx and 58040xxx dryer models vary somewhat, but use the same
general concept of operation.
Table 1: Fire Safety Functions for 6458xxxx and 7272xxxx Dryer Models
Sensor type
Temperature switch
(closes at preset temperature)
Thermocouple
(provides continuous temperature data to 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
(temperature
or condition
that triggers
action)
225° F (107° C) 550° F (288°
C) 175° F
(79° C)
5° F rise for 15
seconds or 15° F
rise for 5 seconds
during min fire* Exceeds 220° F
(104° C) for 5
seconds** 240°F (116°C)
Consequence
exceeding
safety limit
Sprinkler actuates
and all dryer
functions stop. Flame shuts off. If flame
will not re-light, the error
stated below occurs. Each step prior to cooldown is
successively canceled while the
condition persists. Sprinkler actuates
and all dryer
functions stop.
Indication
safety limit
was exceeded
THREE WIRE
DISABLED error
and operator
alarm Initially none. If flame will
not re-light, the CHECK
ERROR LIGHTS error and
operator alarm occur. “MINF” appears
on operational
display and data is
saved to dry cycle
details “>220” appears
on operational
display and data is
saved to dry cycle
details OUTLET TEMP
EXCEEDED 240
Df - POWER
DOWN error and
operator alarm
Corrective
action
See Section 5
“What to Do If
the Sprinkler
Actuates”
Normally self-correcting. If
above error occurs, refer to
“Error Messages”
elsewhere. See Section 2 “About the “Min Fire”
and “Outlet Temperature Exceeded
220°” Faults”
See Section 5
“What to Do If
the Sprinkler
Actuates”
* Not applicable to steam dryers
** Not applicable to non-modulating steam dryers.
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