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3
System piping
The following chart (Table 3B) details the relationship of water
temperature and time with regard to scald injury and may be
used as a guide in determining the safest water temperature for
your applications.
Table 3B Approximate Time / Temperature Scald Chart
APPROXIMATE TIME / TEMPERATURE
RELATIONSHIPS IN SCALDS
120°F
125°F
130°F
135°F
140°F
145°F
150°F
155°F
Water chemistry
The temperature rises and circulating
NOTICE
pumps shown in Table 3C are selected
based on the heating of potable water with
a specified water chemistry. See Table 7A
in Start-Up Section for recommendations.
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. See Table 7A in Start-Up Section
for recommendations.
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.
Table 3C Water Heater Pump Applications / Typical Temperature Rise
Model
200/201 1-1/4"
*Denotes standard pump supplied with unit.
14
More than 5 minutes
1 1/2 to 2 minutes
About 30 seconds
About 10 seconds
Less than 5 seconds
Less than 3 seconds
About 1 1/2 seconds
About 1 second
Water Heater Pump Applications
*Pipe
Water
Grundfos
Size
Hardness
5 to 12 gpg *UP 43-100 SF
151
1-1/4"
12 to 15 gpg
TP 40-160
5 to 12 gpg *UP 43-100 SF
12 to 15 gpg
TP 40-160
5 to 12 gpg *UP 43-100 SF
286
2"
12 to 15 gpg
TP 40-160
Outdoor Armor Water Heater Installation & Operation Manual
Piping components
Water heater system piping:
Water heater system piping MUST be sized per the pipe
requirements listed in FIG.'s 3-8 and 3-9. 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 3-5 thru 3-19.
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 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 (see Table 7A). When required, helps
to eliminate debris from causing damage to the heat exchanger.
⚠ CAUTION
Flow
Loss
Rate
(FT/HD)
(GPM)
16
20
24
41
21
22
28
38
30
23
38
36
Check recirculation pump size to verify it
is sized for filter addition and upsize if
necessary.
Temp.
Rise
18°F
12°F
18°F
13°F
Pump selections and flow
18°F
shown in Table 3C are based
14°F
on 45 feet of piping, 4 - 90°
elbows, and 2 - fully ported
ball valves.
NOTICE
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