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10
Closed Loop Ground Source Systems cont.
Figure 5b: Primary/Secondary Hook-up
Figure 6: Loop Pump Wiring
Figure 5a: Primary/Secondary Wiring with Aurora Base
Control (no AXB Board)
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
NOTE:
This feature is only available in the Aurora Advanced
Control package (AXB board), NOT the Aurora Base
Control (ABC).
When two units are connected to one loop pumping system,
pump control is automatically achieved by connecting the
SL terminals on connector P2 in both units with 2-wire
thermostat wire. These terminals are polarity dependant (see
Figure 5b). The loop pump(s) may be powered from either
unit, whichever is more convenient. If either unit calls, the loop
pump(s) will automatically start. The use of two units on one
flow center is generally limited to a total of 20 gpm capacity.
It is recommended that water solenoid valves be installed
on heat pumps that share a flow center. This is to allow
water flow through only heat pump that has a demand.
Circulating fluid through a heat exchanger of a system
that is not operating could be detrimental to the long term
reliability of the compressor.
NOTE:
To achieve this same feature when heat pumps have
only the Aurora Base Control, follow Figure 5a. Installer will
be required to supply fuses, two relays, and wiring.
When equipment is ordered with factory installed internal
flow center the flow center will be wired per Figure 6.
Black(2)
1
2
PB1
2
1
5A
C
irc
u
it B
re
ak
er
5A
C
irc
u
it B
re
ak
er
L2
L1
CC
T2
T1
5
2
4
RP
FP
Red(22)
G
Ground Lug
Pump
Pump
G
Red(23)
Black(1)
Black(3)
Violet (7)
Violet (8)
Green (11)
Yellow (9)
Wiring For Op
Ɵ
onal
Internal Flow Center
AXB to
Electromechanical Units
To Electromechanical Unit
AXB to
Premier
Unit #2
Unit #1
with AXB Board
Unit #1
with AXB Board
Unit #1
with AXB Board
Unit #2
with AXB Board
AXB to AXB
C
S
VS
SLO
SLI
OUT
IN C
C
VS
SLO
SLI
OUT
IN C
C
With pump
wired to
Unit 2
With pump
wired to Unit 1
VS
SLO
SLI
OUT
IN C
C
Shut
Down
C
C
SL1
In
SL1
Out
With pump
wired to
Unit 1
With pump
wired to
Unit 2
VS
SLO
SLI
OUT
IN C
C
with Premier Board
AFFINITY SERIES
OUTDOOR PACKAGED HEAT PUMP INSTALLATION MANUAL