Technical data

10
and regulations) these being separate items for the scope
of delivery ordered from Viessmann according to the de-
scriptions below.
We always recommend installing a rotary valve as
per section 7.2.3 for the PYROT Rotation Heating
System.
In addition to being a safeguard against burn-back,
this will also prevent any penetration by air leaking in
via the feed auger.
7.2.1 Automatically Triggering System for the Material
Supply System (SLE-M)
Approved in part as a variation to the shut-off valve in
pressure-less fuel storage units.
The heating engineer according to Spec Sheet 4550
must carry out the installation of the extinguishing
system.
7.2.2 The slide valve
This is approved in pressure-less fuel storage units in all
cases and suitable safeguard against back-burn.
7.2.3 Rotary valve
If remnant wood is moved into fuel storage spaces with
fans, then, in order to reduce pressure applied, at least one
rotary valve is necessary to reduce pressure between the
fuel storage unit and the furnace. The rotary valve is
suited to reduce pressure and at the same time is consider
as a suitable safeguard against back-burn.
Max. overpressure allowed in fuel storage unit:
(+500 Pa) +2.00"wc.
Max. negative pressure allowed in fuel storage unit:
(+0 Pa) +0"wc.
7.2.4 Double rotary valve with pressure compensa-
tion system
If, due to special circumstances, any mechanically pro-
duced negative pressures or extraordinarily high overpres-
sures are expected in the fuel storage unit, then two rotary
valves must be installed in the material transport route ac-
cording to the respective project plan with a pressure com-
pensation line to the outdoors.
Maximum overpressure allowed in fuel storage unit:
(+3000 Pa) /+12"wc.
Maximum negative pressure allowed in fuel storage
unit: (-3000 Pa) / – 12"wc.
One must have the supplier of the chip suctioning system
confirm the maximum pressures to be expected.
The rotary valve below the silo extraction system can be-
come leaky due to wear of the sealing elements or through
large pieces of wood that cannot be conveyed. This leak-
age can make it possible for low-temperature gases to flow
back from the furnace into the silo.
A smoke gas alarm must be installed between the rotary
valve and the silo extraction system, which, when trig-
gered, will disconnect the system causing the negative
pressure for the silo.
7.3 Fire protection for the fuel storage space
The measures necessary for this are never part of the
scope of performance from Viessmann.
The conditions set by the local building authorities must be
met by the operating organisation in this connection.
8 Commissioning
Only Viessmann or another trained specialist may put a
newly installed facility into operation for the first time.
Before the facility is commissioned, the system must be
filled with water, fuel stored for the commissioning and the
installation inspected.
8.1 Filling the heating system
The first filling is usually carried out with untreated water
without any chemical water treatment but definitely filtered
and thus free of any suspended solids.
Pay special attention when the filling is carried out to be
sure the air is carefully bled out. With difficult water con-
ditions (high degrees of hardness, etc) and/or large vol-
umes of water by using appropriate measures for water
treatment.
Note: The filling pressure of the cold water reserve should
be approx. (0.1 bar) 1.5 psig greater than the supply pres-
sure of the closed expansion tank.
8.2 Fuel for the commissioning
For the commissioning, dry fuel (max. W 20%) should be
stored in an amount for approx. 10-24 full operating hours.
This is as follows:
PYROT 100 approx. 1760 lb
PYROT 150 approx. 2640 lb
PYROT 220 approx. 3300 lb
PYROT 300 approx. 4400 lb
PYROT 400 approx. 5500 lb
PYROT 500 approx. 6600 lb
Since the boiler plant is cold, and the residual moisture will
also be drawn from the refractory concrete during the ini-
tial operation, the material to be burned for the initial op-
eration has to be at least air dry. The heating-up process
should be carried out during the first three hours at low
output.
To check the functioning of the silo extraction system, not
too much material to be burned should be stored so as to
be able to quickly clear out the extraction system to rem-
edy the cause of any malfunction there might be.