Closed Loop - Ground Source Systems - York YAZS022 Installation Manual

AFFINITY INDOOR SPLIT SERIES INSTALLATION MANUAL

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.
Figure 4: Typical Split System Application Closed Loop - Earth Coupled
Thermostat Wire
From Air Handler
Disconnect
Flow Center
Electrical Supply
Vibration Absorbing Pad or Air Pad
Insulated
Lineset
T o Air
Handler
DHW Out
DHW In
Water Out
Water In
P/T Plugs
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.
Figure 5: Primary/Secondary Wiring
Ext Pump
Circuit
1/2 hp Total
PB1 Breaker
208-230/60/1
1
1 5A
1
2
Pump Pump
5A
2
G Circuit
Breaker
HWG
Pump
Optional Internal
Field Supplied
Relay for Heat
Pump 2
To Loop
GeoLink
Flow Center
Rubber Hose Connector
Kit CK4L or CK4S
NOTE: Additional information can be found in Flow Center
installation manual and Flush Cart manual.
10
Compressor
Blue
S C
R
Cap
Hot Water
Red
Black
Tan(6)
Field Supplied
Limit Switch
Fuses 5A
130°F
Purple
T1
T2
CC
L2 L1
Cabinet
HW Switch
Blue
3
2
1
Field Supplied
HWG Pump
Relay for Heat
Pump 1
Heat Pump 1
Contactor Coil
Heat Pump 2
Contactor Coil