15
R e s i d e n t i a l D i g i t a l H & V - Tr a n q u i l i t y
®
2 2 D i g i t a l ( T Z ) S e r i e s - 6 0 H z H F C - 4 1 0 A
C r e a t e d : 2 6 O c t . , 2 0 1 1 B
c l i m a t e m a s t e r. c o m
Figure 14b: Valve Position B - Loop Fill
Loop
Valve Position
Out
In
Flushing the Earth Loop
Flush Port
Figure 14c: Valve Position C - Unit Flush
Loop
Valve Position
Out
In
Unit Fill
Unit
fi
ll valves should be switched while
fl
ush cart is
pumping to
fi
ll the unit heat exchanger and hose kit. The
position should be maintained until water consistently is
returned into the
fl
ush reservoir.
Loop Flush
Switch to valve position B. The supply water may be shut off
and the
fl
ush cart turned on to begin
fl
ushing. Once the
fl
ush
reservoir is full, do not allow the water level in the
fl
ush cart
tank to drop below the pump inlet line or air can be pumped
back out to the earth loop. Try to maintain a
fl
uid level in the
tank above the return tee so that air can not be continuously
mixed back into the
fl
uid. Surges of 50 psi [345 kPa] can
be used to help purge air pockets by simply shutting off the
return valve going into the
fl
ush cart reservoir. This process
‘dead heads’ the pump to 50 psi [345 kPa]. To dead head
the pump until maximum pumping pressure is reached, open
the valve back up and a pressure surge will be sent through
the loop to help purge air pockets from the piping system.
Notice the drop in
fl
uid level in the
fl
ush cart tank. If all air
is purged from the system, the level will drop only 3/8” in a
10” [25.4 cm] diameter PVC
fl
ush tank (about a half gallon
[1.9 liters]) since liquids are incompressible. If the level drops
more than this level,
fl
ushing should continue since air is
still being compressed in the loop
fl
uid. Do this a number of
times. When the
fl
uid level is dropping less than 3/8” in a 10”
[25.4 cm] diameter tank, the
fl
ow can be reversed.
NOTICE: Actual
fl
ushing time require will vary for each
installation due to piping length, con
fi
guration, and
fl
ush
cart pump capacity. 3/8” or less
fl
uid level drop is the ONLY
indication that
fl
ushing is complete.
Front of Unit
Valve Position
Switch valves to position C to
fl
ush the unit. Flush through
the unit until all air pockets have been removed.
