Flushing The Earth Loop - ClimateMaster Trilogy Q-Mode (QE) Series Manual

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. Antifreeze should be used
where piping passes through an area that may drop below
freezing or any time the LWT of the unit may drop below
40°F. 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 or flush bag 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 Flow (GPM)
3/4" 4 [4.3 L/M per KW]
1" 6 [6.5 L/M per KW]
1 1/4" 10 [10.8 L/M per KW]
1 1/2" 13 [14.0 L/M per KW]
2" 21 [22.6 L/M per KW]
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) to fill the unit.
Figure 14a: Typical Cleanable Flush
Cart Strainer (100 mesh [0.149mm])
Trilogy Q-Mode (QE) Series IOM - 60Hz HFC-410A
® ®
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
Isolate expansion tank during the 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.
NOTICE: A hydrostatic pressure test is required on ALL piping,
especially underground piping before final backfill per IGSHPA
and the pipe manufacturers recommendations.
CAUTION! Never exceed a pressure of 100 psig in
a Trilogy unit. Pressure greater than 100 psig will
damage the unit pressure sensor causing the unit to
miscommunicate certain data points and may cause the
unit to nuisance fault.
Figure 15a: Valve Position A - Loop Fill/Flush
Front of Unit
Valve Position
c l i m a t e m a s t e r . c o m
R e v i s e d : D e c e m b e r 2 2 , 2 0 2 1

Flushing the Earth Loop

⚠
WARNING!
Connect to Flush
Cart Hose (1 of 2)
⚠
CAUTION!
Valve Position
Out
In
⚠
⚠
Loop
15