Enertech XT024 - Page 20

20
Enertech Global IOM, XT Models
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 ush cart pump may be turned
off.
Step 3: Adding Antifreeze by Displacement
If the antifreeze was not added when the loop was
being lled, it will be necessary to follow the next
few steps.
1. Turn both 3-way “Ts” back to the original position
for ushing the loop only.
2. Close the return side ball valve on the ush cart.
3. Connect hose to the return side discharge line
and run it to a drain. Open the ball valve on
discharge line on ush 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 ush
cart. Turn the return line ball valve back to the
on position.
Figure 7: Flush Cart Connections Figure 8: Flow Center 3-Way Valves
Flush Port
Flush Port
Flush Port Flush Port
Loop Loop
Loop Loop
Unit Unit
Unit Unit
Section 5: Unit Piping Installation
1. Once the water level stays above the “T” in
the reservoir, turn off the water supply (this also
allows observation of air bubbles).
2. 8. Run the pump for a minimum of 2 hours for
proper ushing and purging (depending on
system size it may take longer).
3. “Dead head” the pump every so often and
watch the water level in the reservoir. Once all
the air is removed there should not be more than
a 1” to 2” drop in water level in the reservoir. If
there is more than a 2” drop, air is still trapped in
the system. This is the only way to tell if air is still
trapped in the system.
4. To dead head the pump, shut off the return side
ball valve on the ush cart. This will provide a
surge in pressure to the system piping, helping to
get the air bubbles moving. Do not reverse ow
during ushing.
Water Quality: Even on a closed loop system water
quality is an issue. The system needs to be lled 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 ush cart.
2. Turn both 3-way valves to the unit and ush port
position.