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INLET AND OUTLET WATER CONNECTIONS
For ease of service, install unions on inlet and
outlet of the water heater. The connection on the
unit marked “Inlet” should be used for return
water from the storage tank. The connection on
the header marked “Outlet” should be
connected to the inlet of the storage tank. (See
Appendix A Water Heater Piping diagrams).
WATER VELOCITY CONTROL
IMPORTANT
To ensure proper velocity through the heat
exchanger, it is necessary to regulate the
temperature rise across the heat exchanger from
inlet to outlet. (This
MUST
be done on initial
installation and periodically rechecked.)
With the correct temperature rise across the heat
exchanger (See TABLE I), you may be assured of
the proper velocity in the tubes and long life and
economical operation from the water heater.
LOW WATER TEMPERATURE
DELIVERY
A number of water heating applications may
require delivered water temperature in a system
below 140°F. Systems such as nursing homes
and hospitals would be examples of this type of
system. A water heating system that will be
operated at less than 140°F
MUST
use a
mixing valve
on the outlet side of the storage
tank in order to ensure that the products of
combustion do not condense inside the
combustion chamber of the water heater. The
mixing valve allows the water heater to operate
above 140°F to protect from condensation, while
still allowing a delivery of colder water to the
system fixtures. Also inherent in this design is the
protection of occupants from water containing
bacteria such as Legionella. Legionella can be
significantly reduced in the water storage vessel
by heating the water to a minimum of 140°F.
(See Appendix A for piping details.)
PUMP OPERATION
The water heater
MUST
be connected
with a properly sized and installed,
intermittent operating, all bronze pump that
circulates water between heater
and storage tank.
Pump is sized to heater input and water
hardness. Should water hardness exceed 25
grains/350 TDS per gallon, consult factory
for pump sizing.
The pump chart (Table J) is based on the
following fittings:
6-90° elbows
2 unions
2 ball valves
1 cold water supply tee
Due to pump capacity the following specifications cannot
be exceeded when using the standard pump:
•Not more than 45 feet of straight pipe
1.
2.
NOTE:
A larger pump
MUST be utilized in
situations where the
distance between the
water heater and tank
exceed those specified.
(TABLE I) – REQUIRED TEMPERATURE RISE
MODEL NUMBER
TEMPERATURE RISE °F
EW 150
4.6
EW 200
6.2
EW 250
7.7
EW 300
9.3
NOTE:
Care should be
taken to measure
temperature rise
and maintain proper
water velocity in the
heat exchanger.
Содержание EW 150
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