Install Instructions

Installation & Operation Manual
38
6 System piping
Water Heater Pump Applications
Model
*Pipe
Size
Water
Hardness
Grundfos
Flow
Rate
(GPM)
Loss
(FT/HD)
Temp.
Rise
125 1"
5 to 12 gpg *UP 26-99 BF 14 17 18°F
12 to 15 gpg TP 40-160 19 40 12°F
200 1-1/4"
5 to 12 gpg *UP 43-100 SF 21 22 18°F
12 to 15 gpg TP 40-160 28 38 13°F
*Denotes standard pump supplied with unit.
Table 6C 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 6C. 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 6-4 thru 6-8.
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 10A). 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
Water chemistry
NOTICE
The temperature rises and circulating pumps
shown in Table 6C are selected based on the
heating of potable water with a specified
water chemistry. See Table 10A 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 10A 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.
Scalding
This water heater can deliver scalding temperature water at any
faucet in the system. Be careful whenever using hot water to avoid
scalding injury. Certain appliances such as dishwashers and
automatic clothes washers may require increased temperature
water. By setting the thermostat on this water heater to obtain
the increased temperature water required by these appliances,
you may create the potential for scald injury. To protect against
injury, you should install a mixing valve in the water system.
This valve will reduce point of discharge temperature by mixing
cold and hot water in branch supply lines. Such valves are
available from the local plumbing supplier.
Figure 6-3 Scald Warning Label Located on the Appliance
The following chart (Table 6B) 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.
APPROXIMATE TIME / TEMPERATURE
RELATIONSHIPS IN SCALDS
120°F More than 5 minutes
125°F 1 1/2 to 2 minutes
130°F About 30 seconds
135°F About 10 seconds
140°F Less than 5 seconds
145°F Less than 3 seconds
150°F About 1 1/2 seconds
155°F About 1 second
Table 6B Approximate Time / Temperature Scald Chart
Check recirculation pump size to verify it
is sized for filter addition and upsize if
necessary.
⚠ CAUTION