System Layout 3 - Viessmann VITODENS 200-W Installation Instructions Manual

Installation Examples

System layout 3

Vitodens 200-W, WB2B with...
– DHW storage tank
– one heating circuit with mixing valve and system separation
N
J
PRV
TPV
Y
Y
5
O
M
I
Fig. 25
Legend
AV Air vent (WB2B models 45, 60)
PRV Pressure relief valve
TPV Temperature and pressure relief valve
Vitodens 200-W WB2B boiler with
Vitotronic 200, HO1 outdoor reset
control
Outdoor temperature
Remote control Vitotrol 300 (optional)
Underfloor heating circuit
Mixing valve temperature sensor
Heating circuit pump
F1
Heating circuit pump
F2
located upstream of heat exchanger
(see IMPORTANT note to the right)
Plate heat exchanger for system
separation
Accessory kit for heating circuit with
mixing valve
I DHW circulating pump sA*
J DHW storage tank
DHW tank temperature sensor
Expansion tank
M DHW recirculation pump sK*
N Power/Pump module
O Optional purge tee (field supplied)
P Flow check valve
* See pages 53 and 57.
(continued)
1
AV
P
Installation of ...
H underfloor heating circuit with 3-way
mixing valve and system separation
(low-temp. circuit)
H DHW production
... with the following flow conditions:
The flow rate of the heating circuit is less
than the maximum possible water flow rate
of the Vitodens 200-W WB2B boiler.
See page 28 for maximum water flow rate
of the Vitodens 200-W WB2B boilers.
The use of a low-loss header is
recommended if the system water flow rate
is unknown. The low-loss header is available
as accessory part.
See following pages for installation
examples with a low-loss header.
IMPORTANT
System separation is required of underfloor
heating systems employing non-oxygen
diffusion barrier tubing.
All components on the secondary side of
the heat exchanger must be made of
corrosion-resistant materials.
2
PRV
Y
F1
F2
DHW circulating pump I must pump into
the Vitodens 200-W WB2B boiler (as
illustrated).
Sizing of field-supplied pump
for proper boiler operation in this system
layout. The performance of the selected
pump must be equivalent or better than
those shown on page 28 of this manual. An
undersized pump may cause short-cycling
and/or improper operation of the boiler.
Viessmann STRONGLY recommends using a
low-loss header and a boiler pump in this
system layout.
Boiler Connections
IMPORTANT
IMPORTANT
F2 is critical
31