NTI Trinity TX81 - Page 40

Boiler and Heating System Piping │ Tx I&O Manual
40
Table 10-4 Circulator and Pipe Size Requirements
Model
Temp.
Rise (ºF)
Boiler Flow
Rate (GPM)
Boiler Head
Loss (ft)
Minimum
Pipe Size
Recommended Primary Loop Pump Size
(1)
B&G
Grundfos
Taco
Armstrong
Tx51
35
2.4
7.2
¾”
NRF-22
UPS15-58
0015-MS
Astro 30 (2)
25
3.3
12
¾”
NRF-25
UPS15-58
0015-MS
Astro 50 (3)
20
4.1
16.6
¾”
NRF-36
UPS26-99
0015-MS
E7
Tx81
35
4.2
7.4
¾”
NRF-22
UPS15-58
0015-MS
Astro 30 (3)
25
5.9
13.4
1”
NRF-36
UPS26-99
0015-MS
Astro 50 (3)
20
7.4
20.4
1”
NRF-36
UPS26-99
0013-MS
E7
Tx101
35
5.2
8.2
1”
NRF-22
UPS15-58
0015-MS
Astro 30 (3)
25
7.3
13.6
1”
NRF-36
UPS26-99
0013-MS
E7
20
9.1
19.8
1”
NRF-36
UPS26-99
0013-MS
E7
Tx151
2
35
7.7
11.2
1”
NRF-25
UPS26-99
0015-MS
Astro 50 (3)
25
10.8
18.4
1-1/4”
NRF-36
UPS26-99
0013-MS
E7
20
13.5
23.2
1-1/4”
PL-36
UPS26-99
2400-20
E8
Tx200
2
35
10.2
10
1-1/4”
NRF-25
UPS26-99
0015-MS
Astro 50 (3)
25
14.3
20
1-1/4”
NRF-36
UPS26-99
0013-MS
E9
20
17.9
29.7
1-1/2”
PL-55
3
UPS26-150
3
2400-45
3
E21
3
Notes:
1
Pump sizing based on Primary/Secondary plumbing configuration with specified minimum pipe diameter with up to 50’
equivalent length.
2
Models Tx151C and Tx200C incorporate the circulator responsible for generating flow through the boiler, therefore
sizing the circulator for boiler flow rate is not necessary.
3
The amperage draw of circulator models PL-55, UPS26-150, 2400-45 and E21 exceed the switching capacity of the
boiler pump contacts, an isolation relay must be utilized.
Figure 10-3(a) Tx51 & Tx81 Head Loss Curves
0
5
10
15
20
25
30
2 4 6 8
Flow Rate (US gpm)
Head Loss (ft)
Tx51
Tx81