Viessmann B2HB008, Installation Instructions Manual

Page: 31 / 64

Vitodens 200-W B2HB 19 to 35, 68 to 125 Installation
31
5461 884 - 14
Boiler Connections
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.
IMPORTANT
Pump selection must be based on accurate system flow
and pressure drop calculations (includes DHW sizing).
Model B2HB 19, 68 B2HB 26, 94 B2HB 35, 125
Flow rate
20ºF

t GPM (L/h)
6.4 (1453) -- --
25ºF

t GPM (L/h)
5.1 (1163) -- --
30ºF

t GPM (L/h)
4.3 (969) 5.9 (1332) --
35ºF

t GPM (L/h)
3.7 (830) 5.0 (1142) --
40ºF

t GPM (L/h)
3.2 (727) 4.4 (999) 5.9 (1328)
Flow limitation
GPM (L/h) 6.2 (1400) 6.2 (1400) 6.2 (1400)
Recommended boiler pumps
Grundfos UPS 15-58 (3-speed), Taco 0015, Wilo Star S 21 FX
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.
Low-Loss Header Application
Sizing of Low-Loss Header in a Residential Single-Boiler Application
* 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.
Boiler
Model
No. of
Boilers
Boiler
Max.
Flow
Rate
GPM
(L/h)
Typical System Flow Rates
Viessmann
Low-loss
Temp.
Sensor
Required* 2

t *1
°F
(°C)
20
(11.0)
25
(14.0)
30
(17.0)
35
(19.5)
40
(22.0)
B2HB 19, 68 1 6.2
(1400)
System Flow
Rate
LLH Required
LLH Model
GPM
(L/h)
6.4
(1453)
Yes
80/60
5.1
(1163)
Optional
80/60
4.3
(969)
Optional
80/60
3.7
(830)
Optional
80/60
3.2
(727)
Optional
80/60
Yes
B2HB 26, 94 1 6.2
(1400)
System Flow
Rate
LLH Required
LLH Model
GPM
(L/h)
8.8
(1999)
Yes
80/60
7.0
(1599)
Yes
80/60
5.9
(1332)
Optional
80/60
5.0
(1142)
Optional
80/60
4.4
(999)
Optional
80/60
Yes
B2HB 35, 125 1 6.2
(1400)
System Flow
Rate
LLH Required
LLH Model
GPM
(L/h)
11.7
(2657)
Yes
80/60
9.4
(2126)
Yes
80/60
7.8
(1771)
Yes
80/60
6.7
(1518)
Yes
80/60
5.9
(1328)
Optional
80/60
Yes