33
Installation & Service Manual
Water temperatures over 125°F (52°C) can cause severe
burns instantly or death from scalds.
Children, disabled, and elderly are at highest risk of being scalded.
See instruction manual before setting the thermostat at the
water heater.
Feel water before bathing or showering.
Temperature limiting valves are available, consult local plumbing
supplier.
Figure 4-4 Scald Warning
4
System piping
(continued)
1. The water heater must be connected to a properly sized
pump that circulates water between the heater and
storage tank.
2. Pump is sized to heater input and water hardness. Care
should be taken to size pump correctly. See
“Water
Chemistry.”
3. The water heater is equipped with a factory supplied
pump delay system.
4. Lubricate pump to manufacturers recommendations.
Pump damage due to inadequate lubrication is
non-warrantable.
5. Standard 150,000 through 300,000 Btu/hr water
heaters are furnished with a 1/4 HP, 120 VAC, 5.8
Amp circulating pump. The circulating pump must
be mounted on the units inlet water connection. The
pump is sized based on installation of the storage tank
and heater in close proximity. If the number of fittings
and straight pipe exceeds the quantities shown in this
section, a larger pump will be required.
The standard pump selection is based on the following pipe
and fittings from the appliance to the storage tank:
Pump operation
6 - 90° elbows 2 - ball valves
2 - unions 1 - cold water tee
Not more than 45 feet of straight pipe.
For every elbow and tee in excess of those shown above,
DEDUCT 5 FEET from maximum allowable straight pipe
in heater to tank circulating loop.
TABLE 4C
MINIMUM PUMP PERFORMANCE
Based on heating potable water with a hardness of 5 to 25
grains per gallon and total dissolved solids not exceeding
350 PPM. See “
Water Chemistry
”.
Btu/hr Input
GPM
Ft. Hd.
150,000 - 300,000
55
10
Heat exchanger
On all models, header inspection plugs can be removed for
field inspection and cleaning of copper tubes. The entire
heat exchanger may be easily removed from the appliance.
Thermostat Settings
1. The thermostat is adjusted to a low test setting when
shipped from the factory.
2. Set the thermostat to the lowest settings which will
satisfy hot water demands and prevent risk of scald injury.
This appliance has an adjustable thermostat to control
water temperature. See temperature adjustment procedure
in general section of the manual. The thermostat is factory
pre-set at approximately 125°F (52°C). Households with
small children or invalids may require 120°F (49°C) or
lower temperature setting to reduce risk of scald injury.
Some states may require a lower temperature setting. Check
with your gas supplier for local requirements governing the
temperature setting. Remember, no water heating system
will provide exact temperature at all times. Allow a few
days of operation at this setting to determine the correct
temperature setting consistent with your needs.
Thermostat Adjustments
NOTICE
(1) This water heater, when set at the
lower temperature setting, is not capable
of producing hot water of sufficient
temperature for sanitizing purposes.
(2) Higher stored water temperature
increases the ability of the water heater
to supply desired quantities of hot water.
Summary of Contents for Efficiency-Pac EW 150 -- 300
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