12
4
Domestic side piping
Installation & Operation Manual
Table 4A
Recirculation Lance Pressure Drop Values
Flow Rate (gpm)
Pressure Drop (psi)
0.2
0.07
0.4
0.25
0.6
0.5
0.8
0.83
1
1.22
1.2
1.68
1.32
1.98
1.4
2.2
1.6
2.78
1.8
3.41
2
4.11
2.2
4.85
Recirculation lance
Recirculation systems with up to 2 gal/min circulation
require the use of a recirculation lance assembly (TUB30000)
(FIG. 4-1). The lance is a stainless steel tube that is inserted
directly into the hot water connection of the tank and into the
stainless steel coil. As part of a continuous, slow-moving loop,
warm water is circulated directly back into the coil, via the lance,
maintaining tank stratification. Reference FIG. 4-5 on page 18
for typical recirculation lance piping.
T&P
RELIEF
VALVE
RECIRCULATION
LANCE
REDUCER
BUSHING
STAINLESS STEEL
REDUCER BUSHING
STAINLESS STEEL
1" NPT NIPPLE
1" NPT DOMESTIC
HOT WATER TUBE
BRASS NIPPLE
1" NPT
1 1/2" NPT
NIPPLE
1/2" NPT
1" NPT
1 1/2" NPT
1 1/2" NPT
1 1/2" N
P
T
1 1/2" N
P
T
1 1/2" N
P
T
1" NPT
RE
CI
RCUL
A
TIO
N
WA
TE
R
L
IN
E
DO
M
E
S
TIC
HO
T W
A
TE
R
DOMESTIC
HOT WATER
IMG00013
Figure 4-1 Recirculation lance assembly
Table 4B
Recirculation Lance Pressure Drop Chart
0
1
2
3
4
5
6
0.0
0.5
1.0
1.5
2.0
2.5
PRESSURE, PSI
FLOW RATE, GPM
