Heating Circuit / Boiler Pumps; Low-Loss Header Application - Viessmann B2HB009 Installation Instructions Manual

Vitodens 200-W B2HB 19 to 35, 68 to 125 Installation

Heating Circuit / Boiler Pumps

Viessmann offers a variety of Grundfos heating circuit/
boiler pumps which meet typical Vitodens system
installation requirements (see "Heating circuit pump
(field supplied)" or "Boiler pump (field supplied)" in the
Installation Examples starting on page 33). See tables
below for recommended pumps. Refer to the graphs
on page 30 for the proper waterside boiler friction loss
calculations. The following pumps have been selected
based on boiler heat exchanger head loss and boiler
piping to a low-loss header.
Model
Flow rate
20ºF t GPM (L/h)
25ºF t GPM (L/h)
30ºF t GPM (L/h)
35ºF t GPM (L/h)
40ºF t GPM (L/h)
Flow limitation GPM (L/h)
Recommended boiler pumps

Low-Loss Header Application

Sizing of Low-Loss Header in a Residential Single-Boiler Application
Boiler No. of
Model Boilers
B2HB 19, 68 1
B2HB 26, 94 1
B2HB 35, 125 1
*1 For system t < 20°F use low-loss header sizes for t 20°F.
*2 Low-Loss temperature sensor - optional equipment for use in single-boiler applications.
B2HB 19, 68
6.4 (1453)
5.1 (1163)
4.3 (969)
3.7 (830)
3.2 (727)
6.2 (1400)
Grundfos UPS 15-58 (3-speed), Taco 0015, Wilo Star S 21 FX
Boiler Typical System Flow Rates
Max.
Flow
Rate
GPM
(L/h)
*1
t
6.2 System Flow
(1400) Rate
LLH Required
LLH Model
6.2 System Flow
(1400) Rate
LLH Required
LLH Model
6.2 System Flow
(1400) Rate
LLH Required
LLH Model
Before using the following pumps for a DHW tank
application, find out the proper pressure drop through the
tank, the required temperature difference through the coil
and system piping head loss of the domestic hot water.
IMPORTANT
Pump selection must be based on accurate system flow
and pressure drop calculations (includes DHW sizing).
B2HB 26, 94
--
--
5.9 (1332)
5.0 (1142)
4.4 (999)
6.2 (1400)
°F 20 25
(°C) (11.0) (14.0)
GPM 6.4 5.1
(L/h) (1453) (1163)
Yes Optional
80/60 80/60
GPM 8.8 7.0
(L/h) (1999) (1599)
Yes Yes
80/60 80/60
GPM 11.7 9.4
(L/h) (2657) (2126)
Yes Yes
80/60 80/60
Boiler Connections
B2HB 35, 125
5.9 (1328)
6.2 (1400)
30 35
(17.0) (19.5) (22.0)
4.3 3.7
(969) (830) (727)
Optional Optional Optional
80/60 80/60 80/60
5.9 5.0
(1332) (1142) (999)
Optional Optional Optional
80/60 80/60 80/60
7.8 6.7
(1771) (1518) (1328)
Yes Yes Optional
80/60 80/60 80/60
--
--
--
--
Viessmann
Low-loss
Temp.
Sensor
Required*2
40
3.2 Yes
4.4 Yes
5.9 Yes
31