10
Figure 4: Typical Split System Application Closed Loop - Earth Coupled
Closed Loop - Ground Source Systems
NOTE:
For closed loop systems with antifreeze protection, set
SW2-1 to the “LOOP” (15°F) position. (Refer to the DIP Switch Set-
tings table in the Aurora Control section.)
Once piping is completed between the unit, pumps and the ground
loop (see figure below), final purging and charging of the loop is
required. A flush cart (or a 1.5 HP pump minimum) is needed to
achieve adequate flow velocity in the loop to purge air and dirt par-
ticles from the loop itself. Antifreeze solution is used in most areas
to prevent freezing. Flush the system adequately to remove as
much air as possible then pressurize the loop to a static pressure of
40-50 psi (summer) or 50-75 psi (winter). This is normally adequate
for good system operation. Loop static pressure will fluctuate with
the seasons. Pressures will be higher in the winter months than
during the cooling season. This fluctuation is normal and should be
considered when initially charging the system.
After pressurization, be sure to turn the venting (burping) screw in
the center of the pump two (2) turns open (water will drip out), wait
until all air is purged from the pump, then tighten the plug. Ensure
that the loop pumps provide adequate flow through the unit(s) by
checking the pressure drop across the heat exchanger and compar-
ing it to the unit capacity data in this catalog. 2.5 to 3 gpm of flow per
ton of cooling capacity is recommended in earth loop applications.
NOTE:
Additional information can be found in Flow Center
installation manual and Flush Cart manual.
Figure 5: Primary/Secondary Wiring
CC
T2
T1
Compressor
C
R
S
Blue
L1
L2
Black
Red
Tan(6)
Cap
Ext Pump
1/2 hp Total
208-230/60/1
Pump
G
1
2
PB1
1
2
Pump
Circuit
Breaker
Circuit
Breaker
1
5A
5A
Optional Internal
HWG Pump
HWG
Pump
Purple
Hot Water
Limit Switch
130°F
Blue
1
2
3
Cabinet
HW Switch
Field Supplied
Relay for Heat
Pump 1
Field Supplied
Relay for Heat
Pump 2
Heat Pump 1
Contactor Coil
Heat Pump 2
Contactor Coil
Field Supplied
Fuses 5A
Multiple Units on One Flow Center
When two units are connected to one loop pumping system, pump
control is achieved by following Figure 5. Installer will be required to
supply fuses, two relays, and wiring.
Vibration Absorbing Pad or Air Pad
P/T Plugs
Water Out
Water In
DHW In
DHW Out
Disconnect
Thermostat Wire
From Air Handler
Lineset
To Air
Handler
Insulated
Flow Center
Electrical Supply
GeoLink
Flow Center
To Loop
Rubber Hose Connector
Kit CK4L or CK4S
AFFINITY INDOOR SPLIT SERIES INSTALLATION MANUAL
Summary of Contents for YAZS022
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