Viessmann KOB Pyrot KRT Series Technical Data Manual page 30

Electrical
Vitocontrol
Mounting of the control panel
The control panel should be in an area where the heat
radiation (front side of boiler, rear side of boiler with flue
gas deduster and flue gas blower as well as recirculation
line) and the exposure to dust during
cleaning is at a minimum.
The ambient temperature for the control panel (approx.
4 in. (100 mm) away from the control cabinet) should not
exceed 104° F (40° C) while the system is in operation.
The minimum temperature must not be less than 50° F
(10° C). In case of doubt, preference should be given
to placing the control panel outside the mechanical room
near the heating room door.
Electrical connection
- Install the control panel according to the field wiring
diagram. The field wiring diagram is supplied with the
control panel.
- In the area of hot parts (flue gas blower, flue gas pipe),
the lines should be installed in steel pipes at an
appropriate distance so as to be protected from
excessive temperatures. See section "Boiler Wiring".
- The cable bushings to the motors and equipment
must be dust-tight and provided with a strain relief.
A microprocessor control system for the complete PYROT
Boiler Plant, including control of the fuel loading systems
required for the separately listed items. The heat output of
the boiler adjusts to the heat consumption in modulating
fashion. A regulating circuit for the combustion optimizing
system is superimposed on the output control circuit with
a lambda sensor. Maximum quality criteria are met in
terms of fire protection and personal protection.
Functions:
- Automatic ignition
- Output and control circuits with modulating output
operation (25%-100%)
- Air-conducted by means of a speed-regulated exhaust
fan, depending on the forward flow temperature
- Precise re supplying of fuel by the in-feed auger
from the metering container with an insulating layer
- Refilling of the metering container with the use of
a level monitoring system
- Limitation and distribution of the mass burning in
the firebox by means of a level monitoring system
in the firebox along with movement of the feed grate
- Emissions-optimized control circuit: Optimized air
supply through motor-operated air vents for the best
possible combustion using a lambda sensor.
Upholding the return temperature with the boiler
mixing value provides for a long service life of the
boiler.
- Safety functions for: Excess temperature, burn-back,
opening of a lid in the loading system and forced
heat dissipation
- Floating output (malfunction combustion system)
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Operation:
Operation is carried out by means of a control panel
with a membrane keyboard and plain language
display. All the operational data can be read on the
display.The set points for all the important
parameters can be entered simply using the keyboard.
Malfunctions are displayed in plain language and
indicated in the order of their occurrence.
Supplied with:
- A microprocessor control system (control panel with
back-lit plain language display), CSA-tested, battery-
backed real-time clock, RS 232 serial interface for
connection to PC.
- Control cabinet (uninstalled), surface powder-coated
with RAL 7035 (gray) textured, executed according
to CSA C.22, ready-wired on series terminals,
Power supply: 208V/3/60Hz; control voltage:
120 / 240V/1/60Hz or 24 V
- Adapted, updateable software
- Soft starter for all the drives for the loader system
(208V/3/60Hz) according to the items priced separately
- Overload protection for boiler pump
- Outputs for stepping motors
- Variable frequency drive (EMC-Operation Class 3)
for exhaust fan
- Main disconnect
- Documentation, including bound circuit diagram,
terminal connection diagram with cable designation,
service and maintenance instructions, installation
and operating instructions in document pocket
- Sensors and switches for the in-feed auger
- Infrared light barrier level monitoring system,
insulating layer for in-feed auger
- Safety limit switch on the maintenance lid for the
in-feed auger
- PT-100 temperature sensor for the feed auger
- Sensors and switches on the fire box for firing
and in the exhaust gas nozzle (installation on site)
- Infrared light barriers for level monitoring of fuel in
the fire box
- Zirconium dioxide sensor with instrument reading
converter (lambda sensor)
- PT-100 exhaust gas sensor
- Sensors and switches mounted on top of the boiler
- KTY boiler sensor in the connecting piece, supply
- KTY return flow sensor in the connecting piece,
return
- Temperature-limiting safety switch (TLSS)
- Sensor, uninstalled
- One KTY sensor with sensor shell, 1/2 " x 280 mm
Pyrot Technical Data