Commissioning The Burner - Viessmann VITOMAX 200-HS Operating And Service Instructions

Commissioning
Commissioning
■ Let the water level return to the zero
point by opening the blow-down valve
and readjust at the controller
■ Bring the boiler to the required water
level and adjust at the controller
Checking the water level limiting
equipment
■ When the low water indicator level
(LWL) has been reached, reset the
water level limiter in the control panel
by resetting the boiler safety chain.
■ Check the response of the water level
limiter under operating conditions in
accordance with the manufacturer's
operating instructions. For this, take
the feed system out of use and reduce
the water level in the boiler to the low
water level by drawing steam or by
means of a blow-down. Observe that
both limiters must respond.

Commissioning the burner

Commission the burner in accordance
with the operating instructions issued by
the burner manufacturer. A prerequisite
for commissioning is that the fuel supply
is enabled and that, when operating with
oil, the quick-acting oil shut-off valve at
the tank operates correctly.
In the case of gas combustion, a healthy
gas supply from the local gas supply util-
ity must be enabled and the gas line
inside the boiler house must be tested
and certified in writing by the system
installer as suitable prior to commission-
ing. The quick-acting gas shut-off valve
at the entry into the building must func-
tion correctly. Any required gas warning
equipment must function correctly.
36
(cont.)
No unauthorised personnel should be in
the boiler house when the burner is
being commissioned.
Once the combustion is steady, raise the
operating pressure under partial burner
load or to burner stage 1 to an operating
pressure of approx. 3 bar. After that
value has been reached, the burner load
is enabled up to rated output. Now slowly
open the steam valve and close the air
vent valve.
Clean the steam lines in accordance with
the specification provided by the user
(blow-through). Ensure the adequate
drainage of the steam systems.
Subject to a steady steam draw-off the
combustion can be finely adjusted.
Agree the operating pressure subject to
the safety pressure with the system
user.
Function check of the safety pressure
limiter
Adjust the safety pressure limiter so that,
before the safety valve responds, it
switches the boiler to fault status. The
setting pressure depends on the individ-
ual system and must be adjusted with
reference to the safety and operating
pressures. It must lie below the response
pressure of the safety valve.
Make the function check with a closed
steam valve and by bypassing the pres-
sure controller (key switch or test button
on the control panel). The burner may be
operated with partial load.