Installation Examples; General; Clearances; Heating Circuit Pumps - Viessmann Vitodens 100-W B1HA 26Vitodens 100-W B1HA 35Vitodens 100-W B1KA 35 Installation And Service Instructions Manual

Connections

Installation Examples

General

The schematics on the following pages are to be seen as
guidelines only. They further do not display all system
varieties, safety devices, or concepts possible. Specific
system layouts may be further discussed with the local
Viessmann sales representative office.

Clearances

A minimum of 2 in. (51 mm) circumferential clearance
from non-insulated hot water pipes to combustible
construction must be maintained. In cases where the
pipes are insulated with pipe insulation of appropriate
and sufficient thickness and insulation values, the above
clearance may be reduced to 0" (refer to local gas codes).
CAUTION
For underfloor heating applications, an additional
immersion or strap-on aquastat must be installed in the
low temperature underfloor loop (downstream of the
mixing valve) to de-energize the pump and/or boiler
to prevent overheating. High water temperatures can
damage concrete slabs.
24
Vitodens 100-W, B1HA series & B1KA Combi Installation/Service

Heating circuit pumps

Heating pumps with Vitodens 100-W are preinstalled.
Grundfos 15-78 (factory set to speed 3)

Refer to the graphs on pages 25 and 26 for the proper
waterside boiler friction loss calculations.
A low-loss header must be used when the system flow
rate exceeds the maximum (or minimum) flow rate of
the Vitodens 100-W boiler. An alternative method may
be used, such as primary secondary piping using closely
spaced tees.
A low-loss header offers additional benefits not provided
by a pair of closely spaced tees. Viessmann strongly
recommends and prefers the use of a low-loss header
over closely spaced tees.
Use standard friction loss method for pipe sizing. Observe
boiler maximum and minimum flow rate limitations.
If system flow rate exceeds boiler maximum flow rate
(as stated on page 25) or if system flow rate is unknown,
Viessmann strongly recommends the installation of a low-
loss header. See page 35 for low-loss header information
or refer to the Vitodens Venting System Installation
Instructions.
IMPORTANT
Pump selection must be based on accurate system flow
and pressure drop calculations (including DHW sizing).