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6
System piping
Water chemistry
Water temperature rise and maximum flow
NOTICE
data is based on heating potable water with
a hardness of 5 to 25 grains per gallon and
total dissolved solids not exceeding 350
ppm.
The required temperature rise and the standard circulating
pump are sized based on the heating of potable water with
a hardness of 5 to 25 grains per gallon and a total dissolved
solids not exceeding 350 ppm. Consult the manufacturer
when heating potable water exceeding these specifications.
Heating of high hardness and/or high total dissolved solids
water may require a larger circulating pump, and a revised
temperature rise specification based on the water chemistry
of the water to be heated.
Water with a hardness of less than 5 grains per gallon will
usually have a pH which can be aggressive and corrosive
causing non-warrantable damage to the pump, and associated
piping. Corrosion due to water chemistry generally shows
up first in the hot water system because heated water
increases the rate of corrosive chemical reactions.
30
Piping components
Water heater system piping:
Water heater system piping MUST be sized per the pipe
requirements listed in Table 6B. 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.'s 6-2 thru 6-6.
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.
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 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.
Table 6B Water Heater Pump Applications / Recommended Temperature
Rise
Water Heater Pump Applications
*Pipe
Size
Model
Inlet Outlet
1.0
2"
3"
1.3
2"
3"
1.5
2"
3"
*Note: Pump sizing and flow requirements are based on 45 feet of piping, 4 - 90°
elbows, and 2 - fully ported ball valves.
**Note: This appliance is shipped with two pumps to meet the fl ow requirements
listed above.
Installation & Operation Manual
**Flow
Pump
Pump
Rate
Make
Model
(GPM)
Armstrong
E22
Grundfos TP 40-160
Grundfos TP 40-160
Loss
Temp.
(FT/
Rise
HD)
100
26
22°F
125
32
22°F
130
31
24°F
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