15
FLOW CENTER INSTALLATION AND LOOP FLUSHING MANUAL
Flow Center Initial Startup
Startup of Flow Center
Check to make sure that the loop and unit isolation valves are completely open and the fl ush ports are closed and
sealed.
Check and record the earth loop pressure: Loop Pressure = In _____ Out _____
Check and record the fl ow rate: Flow Rate = _____ GPM (L/S)
Check performance of unit. Refer to unit specifi cation catalog.
P Series/E Series equipment includes freeze protection thermistors to protect the water-to-refrigerant heat exchanger
(coax) from damage caused by freezing liquid. Be sure the “Loop/Well” DIP switch is in the “Loop” position if antifreeze is
used and in the “Well” position if plain water is used in the loop.
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Figure 12a: FPT Style
Figure 12b: GL Style
HEAT PUMP
CONNECTIONS
GROUND LOOP
CONNECTIONS
Valve Positioning - Operational Mode
Procedure for Pressurizing System
Once the system is completely fl ushed and antifreeze added, it can then be pressurized. Perform this by deadheading
the pump by closing the return hose ball valve. This will increase the pressure on the loop via the fl ush cart pump. As the
pressure will fl uctuate with the seasons (higher in winter, lower in summer), it is suggested that the initial loop pressure
be 50-75 psi in winter, 40-50 psi in summer. If you cannot reach these pressures with the fl ush cart pump alone, turn on
the fresh water feed to the cart while still deadheading the pump. The potable water pressure along with the pump will
increase the amount of pressure in the loop.
Rotate the fl ow center valves to isolate the fl ush cart from the rest of the system.
Turn off fl ush cart pump, relieve the pressure on the hoses, and remove them.
Replace caps in access ports.
Before starting loop pump(s), be sure to bleed any air from the inside of the pump. This can be done by removing the
bleed screw from the center of the pump head, allowing a small amount of fl uid to drip out. Replace the bleed screw.
Note:
If the fl ow center is mounted in the horizontal position, the supply hose during the last fl ush must be connected to the
lower fl ush port to allow air to pass out of the upper port.
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