System Layout 2 - Viessmann B1KE Combi Series Installation And Service Instructions Manual

Installation

System Layout 2

Vitodens 100-W, B1HE 85, 120, 150, 199 with...
- DHW storage tank
- low-loss header
- one heating circuit
Legend
PRV Pressure relief valve
TPV Temperature and pressure relief valve
A Vitodens 100-W gas-fired condensing boiler
B External boiler controller with room thermostat
connection (field supplied)
C Heating circuit
D Heating circuit pump
E DHW storage tank
F DHW tank temperature sensor (or DHW temperature
switch)
G Low-loss header
)
H Expansion tank
I Outdoor temperature sensor
Note: Refer to the residual head curves on page 32.
The use of a low-loss header is recommended if
the water flow rate is above or below the operating
range.
The low-loss header is available as accessory part.
Maximum Flow Rates
Model B1HE
Output
 t
30ºF (17ºC) rise GPM (L/h)
35ºF (19.5ºC) rise GPM (L/h)
40ºF (22ºC) rise GPM (L/h)
* Requires low loss header or closely spaced tees.
34
P2
85
MBH 80
5.3 (1204)*
4.6 (1045)
4.0 (908)
Vitodens 100-W, B1HE/B1KE Combi Installation/Service
IMPORTANT
DHW supply and return piping between boiler DHW
connections and the Viessmann DHW tank connections,
shall be a minimum of 1a in. nominal pipe diameter.
This ensures that the head of the pump is fully utilized
to overcome the resistance of the DHW heat exchanger
coil and to provide sufficient water flow to the boiler
heat exchanger.
In non-Viessmann DHW tank applications, perform, in
addition to the above, accurate calculations for DHW
tank coil pressure drop versus boiler pump head to ensure
sufficient water flow to the boiler heat exchanger.
Failure to heed the above instructions may cause boiler
short-cycling and inadequate DHW supply.
120
113
7.5 (1703)* 9.4 (2135)*
6.5 (1476)* 8.1 (1840)
5.7 (1295) 7.1 (1613)
150 199
141 187
12.5 (2839)*
10.7 (2430)*
9.4 (2135)