Eternal GU145 Series, Installation And Operation Manual

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Water Supply Connection
The water  ttings on the Eternal water heater are 3/4" NPT.
Although Eternal's water connections are 3/4", if the installation site has only 1/2" plumbing throughout the
building, it is not necesssary to up size the water lines to 3/4" when installing a single unit.
When installing multiple units to supply higher volumes of hot water either in residential applications or in
commercial applications, the number of Eternal water heaters required and the header pipe sizing needs to be
properly sized to meet the total hot water demand.
All pipes, pipe
 ttings, valves and other components including solder, must be approved for use in potable water
systems.
The use of unions and material shut off valves on both the cold water inlet and hot water outlet is recommended.
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WATER SUPPLY CONNECT
Be careful not to reverse the hot water outlet and cold water supply line connections to the water heater. This will cause
your heater to operate dangerously and void warranty. Make sure the hot and cold lines are connected properly.
WARNING
! !
Recirculation is strongly recommended for commercial applications with rapid on/off hot water usage or significant
dump loads.
WARNING
! !
Close water supply shut-off valve to the unit  rst.
Connect garden hose to the draining valve located on the lower leftsider of the unit.
Open the valve by using a
 at head screw driver to drain water with the hose.
After draining the tank, turn the valve body to remove the draining valve from the unit and clean the  lter.
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FILLING THE WATER
DRAINING THE WATER
Close the water heater drain valve by turning the knob to the right. The drain valve is on the lower leftside of the
water heater.
Open the cold water supply valve to the water heater.
To ensure complete
 lling of the tank, allow air to purge by opening the nearest hot water faucet. Allow water to
run until a constant  ow is obtained.
Check all new water piping for leaks. Repair as needed.
Never use this water heater unless it is completely  lled with water.
Be certain there are no loose particles or dirt in the piping. Keep a copper pipe diameter at NPT 3/4 inch
diameter to allow full
 ow. If the hot and cold connections are reversed, the heater will not work properly and
could damage the unit. Be sure to connect them correctly.
If water
 ow is low, check the  tter by removing the draining valve.
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CAUTION
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Do not open the draining valve without connecting a hose so that water can be diverted to an area where water
damage is not a problem. Do not remove the draining valve from the unit without
 rst draining the tank.
CAUTION
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