32
Enertech Global
IOM, ZS/ZT Models
3. Connect hose to the return side discharge
line and run it to a drain. Open the ball
valve on discharge line on flush cart.
4. Turn pump on until water level is sucked
down just above the water outlet in the
reservoir, and turn pump off. Be sure not to
suck air back into the system.
5. Fill the reservoir back up with the antifreeze.
6. Repeat steps 5 and 6 until all the antifreeze
is in the system and reservoir.
7. Turn the discharge line ball valve off at the
flush cart. Turn the return line ball valve
back to the on position.
8. It may be necessary to add some water into
the reservoir to keep the water level above
the return tee so that the solution does not
foam.
9. The system must be run for 3 to 4 hours to
mix the antifreeze and water in the reservoir.
The fluid will not mix inside the loop.
10. Check the antifreeze level every so often to
insure that the proper amount was added
to the system (see antifreeze charging
section).
Step 4: Final Pressurization of System
Once all of the air and debris has been
removed, and the antifreeze has been
added and mixed, the system is ready for final
pressurization.
1. Turn one of the 3-way valves so that it is
Figure 7: Flush Cart Connections
Figure 8: Flow Center 3-Way Valves
Flush P
or
t
Flush P
or
t
Flush P
or
t
Flush P
or
t
Loop
Loop
Loop
Loop
Unit
Unit
Unit
Unit
SECTION 5: UNIT PIPING INSTALLATION
piping, helping to get the air bubbles
moving. Do not reverse flow during flushing.
Water Quality: Even on a closed loop system
water quality is an issue. The system needs to be
filled with clean water. If the water on site has
high iron content, high hardness, or the PH is out
of balance, premature pump failure may result.
Depending upon water quality, it may need to
be brought in from off site.
STEP 2: FLUSHING THE UNIT
1. Turn off the pump on the flush cart.
2. Turn both 3-way valves to the unit and flush
port position.
3. Turn the pump back on. It may be
necessary to turn the water supply back
on to keep the water level in the reservoir
above the return tee.
4. This should only take 5 to 10 minutes to
purge the unit.
5. Once this is done, the entire system is now
full of water, and the flush cart pump may
be turned off.
Step 3: Adding Antifreeze by Displacement
If the antifreeze was not added when the loop
was being filled, it will be necessary to follow
the next few steps.
1. Turn both 3-way “Ts” back to the original
position for flushing the loop only.
2. Close the return side ball valve on the flush
cart.