Aquacal SunPower SP05, Installation Manual

Page: 30 / 108

Page - 26
IN THIS SECTION:
1.5.a Connecting Heat Pumps 26
1.5.b Configure Primary Heat Pump 27
1.5.c Configure Secondary Heat Pumps 27
1.5.a Connecting Heat Pumps
RS-485 Connection Points
(Dry Contact)
Figure 8
1. Choose one unit to be the lead (or primary) unit. This is typically a
unit that can be accessed easily when temperature adjustments are
needed.
l
Note - The primary unit can be connected to an external controller
via the controller (PORT B) connection point if desired.
2. Deactivate power to heat pumps.
3. Remove electrical access panels.
4. Route 22-gauge, 2-conductor, low-voltage wires to the low voltage
sides of the electrical enclosures. Follow all National Electric Codes
(NEC) and / or State and Local guidelines.
5. Connect the first secondary heat pump's wires to the unit selected as
the primary heat pump's.
6. Use "Port C" on the control boards as indicated. Connecting the "Y"
to the "Y" and the "B" to the "B" on each heat pump's port "C"
connection point. The "G" and "R' connection points are not used. See Figure 8.
7. Connect any additional heat pumps as indicated, doubling up the wires as shown. See Figure 9. Confirm the
same color wires connect to the same wires on each heat pump ("Y" to "Y" and "B" to "B"). Up to 16 heat
pumps can be controlled by one heat pump.
8. Label the heat pumps appropriately as a primary unit and secondary units (Primary, Secondary 01, Secondary
02, etc.) to simplify configuration and future operation.
9. Reattach access panels.
Multiple Heat Pump
Connection Points to "Port C"
Figure 9
10. Apply power to primary heat pump. Confirm the mode is set to " HEAT PUMP OFF ".
11. Apply power to the next heat pump and confirm the mode is set to "
HEAT PUMP OFF
". Do this for each heat
pump.
12. Program heat pumps with assigned addresses. See " Connecting Multiple Heat Pumps (Optional) " on the
previous page.
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