Enertech VS Series - Page 27

27
IOM, VS/VT Models, Rev A Enertech Global
• Run the pump for a minimum of 2 hours for proper
ushing 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 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.
Step 2: Flushing the Unit
• Turn off the pump on the ush cart.
• Turn both 3-way valves to the unit and ush port
position.
• 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 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.
• Turn both 3-way “Ts” back to the original position
• for ushing the loop only.
• Close the return side ball valve on the ush cart.
• Connect hose to the return side discharge line
and run it to a drain. Open the ball valve on
discharge line on ush 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 ush
cart. Turn the return line ball valve back to the
on position.
• 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.
• The system must be run for 3 to 4 hours to mix the
antifreeze and water in the reservoir. The uid
will not mix inside the loop.
• Check the antifreeze level every so often to
insure that the proper amount was added to the
system (see antifreeze charging section).
Figure 5: Typical Flush Cart Connections
Figure 6: 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