Product Information - Viessmann Vitorond 100 VR1 Series Installation And Service Instructions Manual

Vitorond 100, VR1-22 to -33 Installation and Service

Product Information

Sectional gray cast-iron boiler with triple-pass design.
For operation in closed loop, forced circulation hot water
heating systems. This boiler does not require a flow
switch.
The boiler model size selected should be based on an
accurate heat loss calculation of the building. The boiler
selected must be compatible with the connected radiation.
Maximum adjustable high limit setting
(Hydrostat 3250-Plus):...........................190° F (88° C)
Fixed High limit Vitotronic 100 or 200
(factory set):........................................230° F (110° C)
Adjustable High limit Vitotronic 100 or 200
(factory set):..........................................167° F (75° C)
Maximum allowable working pressure*1: ...45 psig (3 bar)
Fuel:.............................................................#2 fuel oil
*1 Cast iron sections are ASME stamped for 58 psig
(4 bar) and maximum allowable temperature of 250° F
(121° C).
Supply/return bypass for large water content systems
For boilers connected to large water content systems
(typically systems with volume > 1 USG (3.8 L) for every
13000 Btu/h of boiler input), such as a previous gravity
system with large free-standing radiators, a bypass line
from the supply pipe to the return pipe must be used to
avoid flue gas condensation in the heat exchanger and the
vent system. A bypass can be installed on any system as
a preventative measure. Viessmann strongly recommends
installing a bypass pipe on all cast iron boilers.
Hydrostat thermal targeting
Thermal Targeting technology analyzes thermostat activity
and continually evaluates how much heat the house
requires. When it is very cold outside, the heat demand is
high and the Fuel Smart HydroStat will raise the boiler's
Target temperature to provide needed heat to the home.
When the outside temperature is milder, the heat demand
is lower. During these periods, the Fuel Smart HydroStat
will lower the boiler's Target temperature – saving fuel –
while continuing to provide comfort to the house.
IMPORTANT
This boiler maybe equipped with an outdoor reset module
(field supplied) that saves energy by reducing the boiler
water temperature as the heating load decreases. This
feature is equipped with an override which is provided
primarily to permit the use of an external energy
management system that serves the same function.
THIS OVERRIDE MUST NOT BE USED UNLESS AT LEAST
ONE OF THE FOLLOWING CONDITIONS IS TRUE:
- an external energy management system is installed that
reduces the boiler water temperature as the heating load
decreases.
- This boiler is not used for any space heating.
- This boiler is part of a modular or multiple boiler system
having a total input of 300,000 BTU/hr or greater.
- This boiler is equipped with a tankless coil.
General Information
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