![background image](http://html.mh-extra.com/html/viessmann/vitoflex-300-uf/vitoflex-300-uf_installation-and-operating-instructions-manual_1017317001.webp)
Installation and
Operating Instructions
for use by engineers and heating contractors
5797 344 - 01 08/2017
Read and save these instructions
for future reference
.
Vitoflex 300-UF 390, 530, 720, 950 AND 1250
Wood-fired Boiler
Output range: UF 390, 334 to 1331 MBH (98 to 390 kW)
UF 530, 450 to 1808 MBH (132 to 530 kW)
UF 720, 614 to 2457 MBH (180 to 720 kW)
UF 950, 812 to 3242 MBH (238 to 950 kW)
UF 1250, 1065 to 4265 MBH (312 to 1250 kW)
Vitoflex 300-UF
Product may not be exactly as shown
Please file in Service Binder
IMPORTANT
IMPORTANT
Please ensure that these instructions are
read and understood before commencing
installation and start-up. Failure to comply
with these Installation Instructions will
render all warranties null and void.
Working on the equipment
The installation, adjustment, service and
maintenance of this product must be
performed by a licensed professional heating
contractor, who is qualified and
experienced in the installation, service
and maintenance of hot water heating
boilers. There are no user serviceable
parts on the boiler or control.
Ensure main power supply to equipment,
the heating system and all external
controls has been deactivated.
Take precautions in all instances to avoid
accidental activation of power during
service work.
Improper installation, service or
maintenance can cause product/property
damage, severe personal injury, and/or
loss of life.
H