11
I-OH (01-20) PN120390R7
•
Refer to
for the maximum horizontal line length with a one-pipe supply system. Fittings, valves, and
filters reduce the total line length allowed. Check the component manufacturer’s information for equivalent length
reductions required to compensate for pressure loss.
•
A one-pipe supply system must be absolutely airtight or else leaks and/or loss of prime may result.
•
section) for 15 seconds after last air is seen from easy-flow bleed valve
to ensure that the line is air-free.
Two-Pipe Supply with Standard Single-Stage Burner Pump or Optional Two-Stage Pump
•
A two-pipe supply system may be used with the standard burner pump or with an optional two-stage pump (option
BZ1).
•
The two-stage pump provides dual pumping gears.
•
Install the two-pipe supply system (see
) as follows:
a. Remove 1/4-inch plug from return line port and insert 1/16-inch bypass plug (shipped with burner pump).
b. Connect inlet and return lines.
c. Terminate return line 3 to 4 inches (76 to 102 mm) above supply line inlet.
•
In the following formula for determining lift in
Firing Rate
= 0.085 for unit size 095, 1.25 for unit size 140,
or 1.35 for unit size 190:
𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿ℎ
=
6 feet
−
(0.75 ×
𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿
)
(0.0086 for 3/8" tubing or 0.00218 for 1/2" tubing) × (
𝐹𝐹𝐹𝐹𝐿𝐿𝐿𝐿𝐹𝐹𝐹𝐹𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿
𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿
in GPH)
Table 6. Maximum Horizontal Line Length for One-Pipe Supply System
Unit
Size
Pipe Size
(Inches)
Lift (Feet (Meters))
0 (0.0)
1 (0.3)
2 (0.6)
3 (0.9)
4 (1.2)
5 (1.5)
6 (1.8)
7 (2.1)
8 (2.4)
Maximum Horizontal Line Length (Feet (Meters))
095
3/8
822 (251)
719 (219)
616 (188)
514 (157)
411 (125)
308 (94)
205 (62)
103 (31)
0 (0)
1/2
3158 (963) 2763 (842) 2368 (722) 1974 (902) 1579 (481) 1184 (361) 789 (240)
395 (120)
140
3/8
556 (169)
486 (148)
417 (127)
347 (106)
278 (85)
208 (63)
139 (42)
69 (21)
1/2
2222 (677) 1944 (593) 1667 (508) 1389 (423) 1111 (339) 833 (254)
556 (169)
278 (85)
190
3/8
423 (129)
370 (113)
317 (97)
264 (80)
211 (64)
158 (48)
106 (32)
53 (16)
1/2
1667 (508) 1458 (444) 1250 (381) 1042 (318) 833 (254)
625 (191)
417 (127)
208 (63)
Figure 5. Two-Pipe Supply System
•
Refer to
for the maximum horizontal line (return and supply) length with a two-pipe supply system.
