Flow Controller 3
R e v. : F e b u r a r y 9 , 2 0 1 6
12
G e o t h e r m a l H e a t P u m p S y s t e m s
Figure 10d: Valve Position D - Full Flush
Unit
Garden
Hose
Flow
Controller
Loop
Dead Head
Pump Test for
Air
Flush Cart
Add
Antifreeze
Now if
Needed
Figure 10e: Valve Position E - Pressurize and Operation
Unit
Garden
Hose
3
Close Flow
Controller
Valves for
Operation
Mode
Loop
1
Dead Head
Pump to
Pressurize
to 50 psi
Flush Cart
2
Close to
Isolate Flow
Controller
Valve
Positions
Flushing the Earth Loop
Front of F
.C.
Valve Position
Front of F
.C.
Valve Position
Move valves to position D. By switching both valves to this
position, water will flow through the loop and the unit heat
exchanger. Finally, the dead head test should be checked
again for an indication of air in the loop. Fluid level drop
is your only indication of air in the loop. Antifreeze may
be added during this part of the flushing procedure; see
antifreeze section for details.
As shown in Figure 10E, close the flush cart return valve
to pressurize the loop to at least 50 psi [345 kPa], not to
exceed 75 psi [517 kPa]. After pressurizing, close the flush
cart supply valve to isolate the flush cart. Move the Flow
Controller valves to position E. Loop static pressure will
fluctuate with the seasons and pressures will be higher in
the winter months than during the cooling season. This
fluctuation is normal and should be considered when
charging the system initially. Unhook the flush cart from the
Flow Controller. Install Flow Controller caps to ensure that
any condensation/leakage remains contained within the Flow
Controller package. If water pressure is too low to pressurize
the loop to between 50 and 75 psi [345 to 517 kPa], use a
hydraulic pump to pressure the loop through the P/T port,
being careful to bleed any air before introducing any fluid
through the P/T port (Some weed sprayers works well as
hydraulic pumps).
NOTICE:
It is always a good idea to plan for a service call/
check-up the first summer of operation, as the loop pressure
may be low due to the stretching of the pipe/rubber hose
after the pipe has settled into the ground and the warmer
summer loop temperatures cause the piping to expand. This
is typical of all new installations. Pressures can easily be
“topped off” with the use of a garden hose and P/T adapter.
Install the garden hose and adapter in the “water in” P/T
fitting; install a pressure gauge in the “water out” P/T fitting.
If the loop pressure is between 50 and 75 psi [345 to 517
kPa] upon completion of the service call, pressures should
be sufficient for all seasons.
NOTICE:
Consult the ClimaDry AOM for flushing instructions
for units with ClimaDry Whole House Dehumidification.
