Submittal Sheet
When the secondary pump is off, there is no circulation in the secondary
circuit; the whole flow rate produced by the primary pump is by-passed
through the separator.
With the hydronic separator, it is thus possible to have a primary production
circuit with a constant flow rate and a secondary distribution circuit with
a variable flow rate; these operating conditions are typical of modern
heating and cooling systems.
Operating principle
When a single system contains a primary production circuit, with its own
pump, and a secondary user circuit, with one or more distributions pumps,
operating conditions may arise in the system whereby the pumps interact,
creating abnormal variations in circuit flow rates and pressures.
The hydronic separator creates a zone with a low pressure loss, which
enables the primary and secondary circuits connected to it to be
hydraulically independent of each other;
the flow in one circuit does
not create a flow in the other if the pressure loss in the common
section is negligible.
Three possible hydronic balance situations are shown below.
Dimensions
G
primary
= G
secondary
G
primary
> G
secondary
G
primary
< G
secondary
Primary Secondary
sGpG
Gp Gs
primary secondary
23.2
A
2”
2 1/2”
3”
4”
5”
6”
B
1 1/4"
1 1/4"
1 1/4"
1 1/4"
1 1/4"
1 1/4"
D
13”
13”
18”
18”
22”
22”
C
13”
13”
15”
15”
15”
15”
E
15”
15”
17”
17”
19”
19”
F
14”
14”
18”
18”
25”
25”
F
B
C D E
A
A
1"
1 1/4”
1 1/2”
B
8 3/4”
9 3/8”
10 7/8”
C
6 1/4”
7 3/8”
D
8 5/8”
9 1/2”
10 1/4”
E
8”
8 3/8”
8 3/4”
Code
548052A
548062A
548082A
548102A
NA548120A*
NA548150A*
Code
548006A/96A
548007A/97A
548008A
HYDRO-SEPARATOR
Serie 548
T
max
250°F
P
max
150 psi
T
max
220°F
P
max
150 psi
0.5
0.7
1.3
4.0
8.0
A
D EC
B
AA
22.5
* without insulation
7.5
8.3
12.5
Weight (lb)
73
79
108
117
220
231
A
8”
10”
12”
B
2”
2”
2”
C
39
3/8
”
43
5/16
”
47
1/4
”
Weight
550
725
1,100
Code
NA548
200A
NA548
250A
NA548
300A
D
33
7/8
”
35
7/8
”
37
7/8
”
E
27
1/2
”
30”
31
1/2
”
F
35
1/2
”
41
3/4
”
47
3/4
”
Flow
792
1,330
1,850
Volume
95
175
255
C ED
AA
F
B
HYDRO-SEPARATOR
Serie 548
T
max
250°F P
max
150 psi
(gal)
548009A 2"
(gpm)(lb)
Volume
(gal)
Volume
(gal)
8.0
4.0
In this case, the flow rate in the respective circuits depends exclusively
on the flow rate characteristics of the pumps, preventing reciprocal
influence caused by connection in series.
Therefore, using a device with these characteristics means that the flow
in the secondary circuit only circulates when the relevant pump is on,
permitting the system to meet the specific load requirements at that time.
Flow (gpm)
40
80
124
247
300
484
11
18
26
Flow (gpm)
Weight (lb)
NA prefix indicates ASME tagged and registered with the National
Board of Boiler and Pressure Vessel Inspectors.
Add NA prefix to 2” to 4” flanged connection for ASME approved.
For larger ASME sizes consult with factory.
NA548
26.012”
11 7/8”
9 1/2”
7 3/4”
10 1/8”
HYDRO-SEPARATOR
Serie 548
T
max
250°F
P
max
150 psi
T
max
220°F
P
max
150 psi
Primary Secondary
Gp Gs
Primary Secondary
Gp Gs
37
3.5