Aquacal GBB Installation Manual page 39

NOTICE
The wire size connecting the heat pumps must be 22-gauge, 2-conductor,
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low-voltage wire. Be sure that the size of the wire will allow at least two
wires per connection point.
Do not attempt to connect heat pump equipment in multiple configurations
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with previous HP7 and HP7R versions of the microprocessor. See Figure 7 .
No onboard port is provided for heat pumps with these microprocessor
versions. An Automatic Sequencing Controller (ASC) accessory is required
for those types of heat pumps.
Connecting Multiple Heat Pumps
1. Choose one unit to be the lead (or master) unit. This is typically a
unit that can be accessed easily when temperature adjustments are
needed.
Note - The Lead unit can be connected to an external controller
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via the "smart bus" 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 slaved heat pump's wires to the unit selected as the
master heat pump's.
6. Use "Port C" on the microprocessors 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 master unit and slaved units (Master, Slaved 01, Slaved 02, etc.) to
simplify configuration and future operation.
9. Reattach access panels.
10. Apply power to master heat pump. Confirm
SYSTEM OFF
the mode is set to "
11. Apply power to the next heat pump and
confirm the mode is set to "
OFF
". Do this for each heat pump.
12. Program heat pumps with assigned
addresses. See "Configuring Multiple Heat
Pumps" on the next page.
Failure to heed the following may result in damage to equipment.
".
SYSTEM
Figure 9
DO NOT CONNECT
HP7 or HP7R boards
Figure 7
Dry Contact Connection
Points to the Microprocessor
Figure 8
Multiple Heat Pump
Connection Points to "Port C"
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