Installation & Operation Manual
41
7
System piping
(continued)
Table 7B
Water Heater Pump Applications / Typical Temperature Rise
Piping components
Water heater system piping:
Water heater system piping MUST be sized per the pipe
requirements listed in Table 7B. Reducing the pipe size
can restrict the flow rate through the water heater, causing
inadvertent high limit shutdowns and poor system performance.
Check valves:
Field supplied. Check valves are recommended for installation
as shown in FIG. 7-3 thru 7-7.
Water heater isolation valves:
Field supplied. Full port ball valves are required. Failure to use
full port ball valves could result in a restricted flow rate through
the water heater.
Anti-scald mixing valve:
Field supplied. An anti-scald mixing valve is recommended
when storing domestic hot water above 115°F.
Unions:
Field supplied. Recommended for unit serviceability.
Water Heater Pump Applications
Model
Pipe Size
Water Hardness
*Grundfos
Flow Rate (GPM)
Loss (FT/HD)
Temp. Rise
400
2"
5 to 12 gpg
*UPS26-150SF, SPEED 2
35
9
22°F
12 to 15 gpg
UPS26-150SF, SPEED 3
39
14
20°F
500
2"
5 to 12 gpg
*UPS26-150SF, SPEED 3
37
16
27°F
12 to 15 gpg
UP43-110FN
53
28
19°F
650
2"
5 to 12 gpg
*UPS43-100SF, SPEED 3
44
15
29°F
12 to 15 gpg
UP43-110FN
61
23
21°F
800
2
"
5 to 12 gpg
*UP 43-110FN
61
22
26°F
12 to 15 gpg
TP 50-80B
79
23
20°F
1000
2-1/2
"
5 to 12 gpg
*UP 43-110FN
79
15
25°F
12 to 15 gpg
TP 50-80B
90
21
22°F
*Denotes standard pump supplied with unit.
Check recirculation pump size to verify
it is sized for filter addition and upsize if
necessary.
⚠
CAUTION
Temperature and pressure relief valve:
Factory supplied on water heaters. The temperature and pressure
relief valve is sized to ASME specifications. Storage tanks may
require additional valves depending on local codes.
Tank sensor:
Lochinvar supplies a tank sensor. The tank sensor must be
installed in the tapping provided in the lower 25% of the storage
tank to achieve proper operation. As shipped from the factory,
the tank sensor is in the literature package shipped with the unit.
Placing the sensor in the tapping provided on the storage tank
will improve temperature response and prevent short cycles of
operation.
Strainer:
Field supplied. Required to help eliminate debris from causing
damage to the heat exchanger. When installing in a pre-existing
system, it is recommended to install a filter in the recirculation
line capable of removing debris left in the system.
Building Recirculation Filter:
Field supplied as required. When required, helps to eliminate
debris from causing damage to the heat exchanger.
Pump selections and flow shown above are based on 45 feet of piping, 4 - 90° elbows, and 2 - fully ported ball valves.
NOTICE
Figure 7-2
Pressure Drop vs. Flow
0
10
20
30
40
50
60
0
10
20
30
40
50
60
70
80
90
100
PR
ES
SU
RE
D
RO
P (
FT
. H
D)
FLOW RATE (GPM)
PRESSURE DROP VS FLOW
(HEAT EXCHANGER ONLY)
400
500
650
800
1000