Specifications

11
GT-PCS Split Units - 60Hz Puron
®
Created: 29 Aug., 2013
Flushing the Earth Loop
Figure 8a: Valve Position A - Loop Fill/Flush
Loop
Out
In
Valve Position
Figure 7a: Typical Cleanable Flush
Cart Strainer (100 mesh [0.149mm])
Figure 7b: Cam Fittings for Flush Cart Hoses
Attach
to Flow
Controller
Flush Port
Connect
to Flush
Cart Hose
(1 of 2)
Flush Port
Front of Unit
Valve Position
 WARNING! 
WARNING! Disconnect electrical power source to prevent
injury or death from electrical shock.
Table 2: Minimum Flow Required to Achieve 2 ft/sec
velocity
Once piping is completed between the unit and the ground
loop, fi nal purging and charging of the loop is needed.
A fl ush cart (at least a 1.5 hp [1.1kW] pump) is needed
to achieve adequate fl ow velocity in the loop to purge air
and dirt particles from the loop itself. Antifreeze solution is
used in most areas to prevent freezing. All air and debris
must be removed from the earth loop piping system before
operation, Flush the loop with a high volume of water at
a high velocity (2 fps [0.6 m/s] in all piping), using a fi lter
in the loop return line, of the fl ush cart to eliminate debris
from the loop system. See Table 2 for fl ow rate required to
attain 2fps [0.6 m/s]. The steps below must be followed for
proper fl ushing.
Units with internal variable speed pumps also include a
check valve internal to the pump. It is not possible to fl ush
backwards through this pump. Care must be taken to
connect the fl ush cart hoses so that the fl ush cart discharge is
connected to the “water in” fl ushing valve of the heat pump.
Loop Fill
Fill loop (valve position A, see Figure 8a) with water from a
garden hose through fl ush cart before using fl ush cart pump
to ensure an even fi ll and increase fl ushing speed. When
water consistently returns back to the fl ush reservoir, switch
to valve position B (Figure 8b).
Isolate expansion tank for fl ushing procedure using the ball
valve. During dead heading of fl ush cart pump, isolation will
prevent compression of bladder in the expansion tank and
fl ush cart fl uid level dropping below available capacity.
NOTICE: A hydrostatic pressure test is required on ALL piping,
especially underground piping before fi nal backfi ll per IGSHPA
and the pipe manufacturers recommendations.
PE Pipe Size Flow (GPM)
3/4" 4
1" 6
1 1/4" 10
1 1/2" 13
2" 21