Installation & Operating Manual

Bobcat Models B-120A and B-200A
26
Table 2a. Recommended pump models for domestic hot water tank piping to the Bobcat model B-120 boiler.
Table 2b. Recommended pump models for domestic hot water tank piping to the Bobcat model B-200 boiler.
Flow
Rate
(gpm)
Temp
Rise
(˚F)
Boiler
Head
Loss
(Feet w.c.)
Domestic Water
Tank Piping
Head Loss **
(Feet w.c.)
Available Head Capability Left for Various Model
Circulators to Overcome DHW Tank Head Loss
(Feet w.c.) ***
Taco 0012 Taco 0014 Taco 0011
10.8 20˚ 10.0' 3.0'
Not Recommended
4.0' 9.5'
7.2 30˚ 5.0' 2.5' 5.0' 10.5' 17.5'
5.4* 40˚ 3.0' 1.5' 8.5' 14.5' 23.5'
Flow
Rate
(gpm)
Temp
Rise
(˚F)
Boiler
Head
Loss
(Feet w.c.)
Domestic Water
Tank Piping
Head Loss **
(Feet w.c.)
Available Head Capability Left for Various Model
Circulators to Overcome DHW Tank Head Loss (Feet w.c.) ***
Taco 0011 Taco 0013
(2 in Series)
Taco 0011
▲
(2 in Series)
Taco 0013
▲
Taco
1400-20 ▲
Taco
1400-45 ▲
18.0 20˚ 23.0' 4.0'
Not
Recommended
Not
Recommended
3.0' 13.0'
Not
Recommended
6.5'
14.5 25˚ 16.5' 3.5'
Not
Recommended
3.5' 17.0' 27.0' 6.0' 15.5'
12.0 30˚ 12.5' 3.0' 5.5' 10.5' 26.5' 36.5' 12.0' 21.5'
9.0 * 40˚ 7.5' 2.5' 14.0' 18.0' 38.0' 46.0' 19.5' 28.5'
Figure 19. Boiler water side pressure drop
0
5
10
15
20
25
0 5101520
Head
(feet w.c.
)
Flow Rate (GPM)
B-200
B-120
Notes:
* This is the minimum flow rate recommended for each of the boiler models.
** Domestic water tank piping head is based on 1” inside diameter piping and full port valves.
*** Refer to the DHW Tank Manufacturer’s water flow rate requirements and associated pressure drop head loss, to select
the appropriate circulator.
▲ If 2 circulators are specified, they must be piped in series in order to provide the head capacity shown. Power to
circulator(s) must be supplied through an appropriate relay to protect the boiler control’s fuse.