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6
Water Piping and Trim
Table 6-3: Flow Range Requirement Through Boiler
Supply
Return
Boiler
Connection
Connection
Model
(in.)
APX425C
1-1/2
APX525C
2
APX625C
2
APX725C
2
APX825C
2
Notes: Required Flow = Output*1000/(500*ΔT), where flow rate is in GPM, output is in MBH, and ΔT is in °F
Outputs for specific boiler models are provided in Table 1-6. See also Tables 6-4 and 6-5 for near boiler piping sizing. Using boiler
antifreeze will result in increased fluid density and may require larger circulators.
Table 6-4: Recommended Taco Circulators for 50 ft. Equivalent ft. Near Boiler Piping [Approximately 20 ft.
Straight Pipe, (4) 90° Elbows, and (2) Full Port Ball Valves]
Near
Supply
Boiler
Boiler
& Return
Pipe
Model
Connection
Size
(in.)
(in.)
APX425C
1½
2
APX525C
2
2
APX625C
2
2
APX725C
2
2
APX825C
2
2½
Table 6-5: Recommended Grundfos Circulators for 50 Equivalent ft. Near Boiler Piping [Approximately 20 ft.
Straight Pipe, (4) 90° Elbows, and (2) Full Port Ball Valves]
Near
Supply
Boiler
Boiler
& Return
Pipe
Model
Connection
Size
(in.)
(in.)
APX425C
1½
2
APX525C
2
2
APX625C
2
2
APX725C
2
2
APX825C
2
2½
106308-05 - 3/23
(continued)
DT= 35°F
Boiler
Minimum
Head
Required
(in.)
Loss
Flow (GPM)
(ft.)
1-1/2
21.5
6.1
2
27.7
5.2
2
33.9
4.7
2
39.4
6.0
2
43.4
5.9
DT=35°F
Boiler &
Piping
Flow
Circulator
Flow
Head
(GPM)
Model
(GPM)
Loss
(ft.)
21.4
6.4
0014
25.0
27.7
5.8
0012
32.3
33.9
5.5
2400-60
39.6
39.4
7.1
2400-60
45.9
43.4
6.4
2400-60
50.7
DT=35°F
Boiler &
Piping
Flow
Circulator
Flow
Head
(GPM)
Model
(GPM)
Loss
(ft.)
21.5
6.4
UP26-64F
UPS43-
27.7
5.8
44FC,
Spd. 2
UPS43-
33.9
5.5
44FC,
Spd. 3
UPS43-
39.4
7.1
100F,
Spd. 2
UPS43-
43.4
6.4
100F,
Spd. 2
APEX
Installation, Operating, & Service Instructions
ΔT = 30°F
Required
Boiler
Flow
Head
(GPM)
Loss (ft.)
25.1
7.9
32.3
6.8
39.6
6.1
45.9
7.9
50.7
7.8
DT=30°F
Boiler &
Piping
Circulator
Flow
Head
Model
(GPM)
Loss
(ft.)
8.3
0013
30.0
7.5
2400-60
38.8
7.2
2400-60
47.5
9.4
2400-65
55.1
8.5
2400-65
60.8
DT=30°F
Boiler &
Piping
Circulator
Flow
Head
Model
(GPM)
Loss
(ft.)
25.1
8.4
UP26-99F
30.2
32.3
7.5
UPS43-44F
38.8
UPS43-
39.6
7.2
47.5
100F, Spd. 2
UPS43-
45.9
9.4
55.1
100F, Spd. 3
UPS43-
50.7
8.5
60.8
100F, Spd. 3
ΔT = 25°F
Required
Boiler
Maximum
Flow
Head Loss
Required
(GPM)
(ft.)
Flow (GPM)
30.2
10.8
38.8
9.3
47.5
8.4
55.1
10.9
60.8
10.8
DT=25°F
Boiler &
Piping
Circulator
Flow
Head
Model
(GPM)
Loss
(ft.)
11.4
2400-60
37.5
10.3
2400-60
48.5
9.9
2400-65
59.4
12.9
2400-65
68.9
11.8
2400-65
76.0
DT=25°F
Boiler &
Piping
Circulator
Flow
Head
Model
(GPM)
Loss
(ft.)
UPS43-
11.5
100F,
37.7
Spd. 2
UPS43-
10.3
100F,
48.5
Spd. 2
UPS50-60F,
9.9
59.4
Spd. 2
UPS50-60F,
12.9
68.9
Spd. 3
UP50-60F,
11.8
76.0
Spd 3
ΔT = 20°F
Boiler
Head
Loss (ft.)
37.7
15.9
48.5
13.6
59.4
12.4
68.9
16.1
76.0
16.1
DT=20°F
Boiler
&
Piping
Circulator
Head
Model
Loss
(ft.)
16.8
2400-70
15.2
2400-65
14.7
2400-70
19.1
1935
17.6
1935
DT=20°F
Boiler
&
Piping
Circulator
Head
Model
Loss
(ft.)
UPS43-
16.9
100F,
Spd. 3
UP50-60F,
15.2
Spd. 3
UPS40-
14.7
80/2,
Spd. 3
UP50-80/2,
19.1
Spd 3
UPS50-
17.6
80/2,
Spd. 3
43
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