Flushing The Earth Loop - ClimateMaster Tranquility 30 Digital TE Series Installation, Operation & Maintenance Instructions Manual

Tranquility 30 Digital ( TE) Series IOM - 60Hz HFC-410A
®
R e v . : O c t o b e r 5 , 2 0 2 1

Flushing the Earth Loop

Once piping is completed between the unit and the ground
loop, final purging and charging of the loop is needed.
A flush cart (at least a 1.5 hp [1.1kW] pump) is needed to
achieve adequate flow 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 filter in the
loop return line, of the flush cart to eliminate debris from the
loop system. Filtration of at least 100 microns should be
used during the flushing process to ensure any debris that
might clog/damage the heat exchanger or pump is removed.
See Table 1 for flow rate required to attain 2fps [0.6 m/s].
The steps below must be followed for proper flushing.
Table 1: Minimum Flow Required to Achieve 2 ft/sec Variety
PE Pipe Size
3/4"
1"
1 1/4"
1 1/2"
2"
Units with internal variable speed pumps also include a
check valve internal to the pump. It is not possible to flush
backwards through this pump. Care must be taken to
connect the flush cart hoses so that the flush cart discharge is
connected to the "water in" flushing valve of the heat pump.
Loop Fill
Fill loop (valve position A, see Figure 15a) with water from a
garden hose through flush cart before using flush cart pump
to ensure an even fill and increase flushing speed. When
water consistently returns back to the flush reservoir, switch
to valve position B (figure 15b).
Isolate expansion tank for flushing procedure using the ball
valve. During dead heading of flush cart pump, isolation will
prevent compression of bladder in the expansion tank and
flush cart fluid level dropping below available capacity.
Figure 14a: Typical Cleanable Flush
Cart Strainer (100 mesh [0.149mm])
14
Flow (GPM)
4 [4.3 L/M per KW]
6 [6.5 L/M per KW]
10 [10.8 L/M per KW]
13 [14.0 L/M per KW]
21 [22.6 L/M per KW]
G e o t h e r m a l H e a t i n g a n d C o o l i n g
⚠
WARNING!
WARNING! Disconnect electrical power source to prevent
injury or death from electrical shock.
Figure 14b: Cam Fittings for Flush Cart Hoses
Attach
to Flow
Controller
Flush Port
NOTICE: A hydrostatic pressure test is required on ALL piping,
especially underground piping before final backfill per IGSHPA
and the pipe manufacturers recommendations.
Figure 15a: Valve Position A - Loop Fill/Flush
Out
Front of Unit
Valve Position
⚠
Connect
to Flush
Cart Hose
(1 of 2)
Valve Position
In
Loop