Requirements For Optimal Operation - Viessmann Vitobloc 200 EM-50/81 Operating Instructions Manual

Usage and operations
5.4

Requirements for optimal operation

Your operational safety will be boosted if you comply
with the items below. Malfunctions or consequential
damage due to unacceptable operating conditions are
neither covered by the warranty nor any service contract.
Design
●
Avoid clocking on-off operation and provide buffer
memory:
V = Q x 43 ltr./kW
buffer th th
●
The ratio of operating hours to starts has to be at
least greater than 3 (in other words, at least three
hours of operation per start).
Installation space
●
Provide exhaust gas and extract air dampers in
sound-critical objects and always plan elastic connec-
tions (i.e., compensators).
●
Make sure that the exhaust gas and extract air lines
are correctly dimensioned and conducted (because of
pressure losses, rated widths and flow roaring).
●
Make sure that it is installed using vibration-
decoupled elements for structure-borne noise decou-
pling.
DANGER
Do not install together with a boiler with an
atmospheric burner or NH
machine in one room/air ratio.
Heating
●
Guarantee constant and sufficient heating water vol-
ume flow.
●
The combined heat and power (CHP) unit must be
protected against silting from the existing heating sys-
tem. It is recommended that you install a dirt catcher
and a dirt separator in the return line to the CHP unit.
●
Prevent emergency shutdown due to excessive heat-
ing water return temperatures. The hot water return
temperature may not be in excess of the acceptable
parameter both in stand-by operation and parallel op-
eration.
●
For hot water return temperatures lower than the
minimum value as per the Technical specifications,
an increase in the return temperature is planned,
which must be installed as close as possible to the
CHP module.
●
The stand-by operation function is not in connection
with operating an absorption refrigerating machine.
Exhaust gas
●
Dimension the exhaust gas cross-section sufficiently.
●
The exhaust gas system has to have qualification
approval with finished systems that is sealed to pres-
sure and pulsation-fixed to 50 mbar. The leakage
may not be any more than 0.006 l/m³s (in accordance
with H1) at this test pressure.
●
Free drainage should be provided for the condensate
over the siphon (U pipe) at a height of at least 250
mm and at least a 3% inclination for keeping exhaust
gas from escaping from the condensate water drain.
●
Hydraulic seals must be executed, so that the water
level can be checked and filled. The condensate line
must be checked regularly blockages and sufficient
water seal.
46
(minimum buffer size)
refrigerating
3
Operating instructions for the natural gas-fuelled CHP module VITOBLOC 200
●
Follow the assembly instructions for the exhaust gas
systems for Vitobloc 200.
●
If the block-type thermal power plant is used in resi-
dential areas, we urgently recommend providing 2
consecutive exhaust gas silencers to comply with the
requirements of spaces for special protection (25
dB(A) at night).
Ventilation
●
Guarantee cooling and combustion air that is not
preheated and free of dust/sulphur/halogen.
●
Guarantee sufficient fresh air supply and reliably carry
off extract air.
●
Provide separate air inlet suction if the air contains
chlorine (such as in swimming pools).
Fuel
●
Maintain flowing gas pressure of 20 mbar to 50 mbar
and a methane number  80.
●
Recommendation: provide a double diameter overdi-
mensioned gas connecting line as a pressure buffer
approximately 5m in front of the block-type thermal
power plant.
●
Optional gas quantity meters generally measure op-
erational cubic meters. These readings should be
converted into normal cubic meters (z number) in ac-
cordance with the guidelines of DVGW-TRGI G 600.
Electro
●
The block-type thermal power plant generates electric
power at 400 V. For reasons of safety, it has sensitive
electrical network protection equipment that reacts to
asynchronous network loads in the customer's net-
work in accordance with the regulations. Safety shut-
downs are not a malfunction of the block-type thermal
power plant.
●
If the electrical loads in stand-by operation are incor-
rectly dimensioned, this may cause emergency shut-
downs due to overloading (inductive or capacitive
starting currents are as much as 20 times the rated
current which can overload the block-type thermal
power plant).
●
Always avoid shutting down under full load since the
component parts are subject to maximum mechanical
loads.
●
The cogeneration modules have to be connected to
the equipotential bonding rail provided by the cus-
tomer via earthing cable.
Service + Operating resources
●
Regular service and care by qualified personnel. We
recommend signing a service contract.
●
Clean up drip leaks, dispose of old oil correctly and
regularly check the exhaust gas condensate lines to
see if they are in good working order.
●
Disconnect the batteries if there are longer interrup-
tions to operations when shutting down the module
and preserve the module as per the warranty when it
is shut down for longer than 24 hours.
●
Preserve the plant as per the warranty no later than
24 weeks after delivery.