32
Enertech Global
IOM, BS/BT Models
•
As the reservoir fills up, turn the pump on
and off, sucking the water level down. Do
not allow the water level to drop below
intake fitting to the pump.
•
Once the water level remains above the
water outlet in the reservoir leave the pump
running continuously.
•
Once the water level stays above the “T” in
the reservoir, turn off the water supply (this
also allows observation of air bubbles).
•
8. Run the pump for a minimum of 2 hours
for proper flushing and purging (depending
on system size it may take longer).
•
“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.
• To dead head the pump, shut off the return
side ball valve on the flush cart. This will
provide a surge in pressure to the system
piping, helping to get the air bubbles moving.
Do not reverse flow during flushing.
Step 2: Flushing the Unit
•
Turn off the pump on the flush cart.
•
Turn both 3-way valves to the unit and flush
port position.
Section 6: Unit Piping Installation
•
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.
•
This should only take 5 to 10 minutes to purge
the unit.
•
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.
•
Turn both 3-way “T's” back to the original
position for flushing the loop only.
•
Close the return side ball valve on the flush cart.
•
Connect hose to the return side discharge line
and run it to a drain. Open the ball valve on
discharge line on flush cart.
•
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.
•
Fill the reservoir back up with the antifreeze
•
Repeat steps 5 and 6 until all the antifreeze is in
the system and reservoir.
•
Turn the discharge line ball valve off at the flush
cart. Turn the return line ball valve back to the
on position.
Figure 17: Typical Flush Cart Connections
Flush P
or
t
Flush P
or
t
Flush P
or
t
Flush P
or
t
Loop
Loop
Loop
Loop
Unit
Unit
Unit
Unit
Figure 18: Flow Center 3-Way Valves