B1Ha With One Heating Circuit, Dhw Tank And Llh - Viessmann Vitodens 100-W B1HA 26Vitodens 100-W B1HA 35Vitodens 100-W B1KA 35 Installation And Service Instructions Manual

Connections
Installation Examples
Vitodens 100-W, B1HA 26, 35 with...
- DHW storage tank
- low-loss header
- one heating circuit
Legend
AV Air vent
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 (field supplied)
E DHW storage tank
F DHW tank temperature sensor
Low-loss header (there is no LLH temperature sensor
G
available for the B1HA)
H Expansion tank
)
I Outdoor temperature sensor (OTS)
Maximum Flow Rates
Model B1HA
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.
28
(continued)
26
MBH 88
5.9 (1332) 7.8 (1772)*
5.0 (1142) 6.7 (1522)*
4.4 (999) 5.9 (1328)
Vitodens 100-W, B1HA series & B1KA Combi Installation/Service
Note: The use of a low-loss header is recommended if the
water flow rate is less than 1.7 GPM (400 L/h) or
more than 6.2 GPM (1400 L/h).
The low-loss header is available as accessory part.
IMPORTANT
DHW supply and return piping between boiler DHW
connections and the Viessmann DHW tank connections,
shall be a minimum of 1 in. nominal pipe diameter
(irrespective of the ¾ in. DHW connection outlet sizes
provided on the boiler and the DHW tank).
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
35
addition to the above, accurate calculations for DHW
117
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.