NTI Trinity Lx150 - Page 47

Lx Series Installation and Operation Instructions │Trinity Lx
47
Table 10-4 Minimum Circulator and Pipe Sizes
Model
Restriction
Head Loss
Minimum
Pipe Size
Min. Flow
(GPM)
Max Temp.
Rise
Minimum Primary Loop Pump Size
B&G
Grundfos
Taco
Armstrong
150
8' at 7 GPM
1"
6
45F
NRF-36
UPS 15-58
1
0011
Astro 50
150E
4' at 7 GPM
1"
6
45F
NRF-22
1
UPS 15-58
1
0011
Astro 30
200
7' at 10 GPM
1-1/4"
8
45F
NRF-36
UPS 26-99
0011
Astro 50
300
7' at 14 GPM
1-1/4"
11
45F
NRF-36
UPS 26-99
0011
1
E7
400
10' at 20 GPM
1-1/2"
16
45F
NRF-36
UPS 26-99
0011
1
E8
500
12' at 25 GPM
2"
20
45F
PL-36
1
UP 43-100
2400-20
1, 3
E8
1
600
10' at 30 GPM
2"
24
45F
PL-55
5
UPS 26-150
2400-45
4
E15
1
700
9' at 35 GPM
2"
28
45F
PL-55
5
UPS 26-150
1
2400-45
4
E15
1
800
11' at 40 GPM
2"
32
45F
PL-55
5
UP 43-110
2
2400-45
4
E15
1
Notes:
1
NOT recommended for DHW indirect circulator when installed as per Figure 10-3, recommend higher head circulator.
2
Grundfos UPS 32-160 can be used in place of UP 43-110; Grundfos UPS 26-150 can be used in place of UPS 43-100.
3
Taco 2400-40 NOT recommended.
4
Taco 2400-60 NOT recommended.
5
B&G PL-75 and PL-130 NOT recommended.
Air Removal – The boiler and system plumbing layout must be configured to promote the removal of air from
the water. Air vents and bleeders must be strategically placed throughout the system to aid in purging the air
from the system during commissioning of the boiler. The system must also employ the use of a strategically
located air removal device, such as an air scoop or micro-bubbler, designed to remove the air from the water
as it flows through the system.
Follow the installation instructions included with the air removal device when placing it
in the system; air removal devices generally work better when placed higher in the
system. Always locate air removal devices in areas of the system that have a guaranteed
positive pressure, e.g., in close proximity to the water fill and expansion tank.
Trinity boilers are equipped with an automatic air removal device to aid in the purging of
air from the boiler during the initial fill. This device is NOT intended, nor is it sufficient
to remove the air from the system plumbing, even if the air makes it back to the boiler.
A strategically located air removal device must be installed in the system.
Expansion Tank – The expansion tank must be sized in accordance with the water volume of the system as well
as the firing rate of the boiler. It is important to locate the expansion tank, and make-up water fill, on the
inlet side of any circulator in the system, as doing so will guarantee the lowest pressure in the system will be
at least equal to the tank and make-up water pressure. See examples in Figures 10-2 and 10-3.
Ensure the expansion tank cannot become isolated from the boiler anytime the system is
operating. Failure to follow these instructions may result in discharge of the Pressure
Relief Valve may result in property damage or personal injury.
The installation of flow checks, motorized valves or other shutoff devices (other than for
the purpose of servicing) are not permitted between the location of the “Closely Spaced
Tees” and the expansion tank; see Figures 10-2 and 10-3.