Leisure Temp LT1000, Installation Manual

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1.6.d Connecting Multiple Heat Pumps (Primary / Secondary)
Up to 16 heat pumps can be connected and controlled from a primary heat pump.
There are two reasons for using a multiple heat pump configuration:
1. Controlling multiple heat pumps from one location; the primary heat pump.
2. Preventing heat pumps from starting up at the same time and causing an excessive power draw
on the electric circuit.
DANGER
Failure to heed the following will result in injury or death.
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Deactivate power while routing wiring to control board.
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Follow all National Electric Codes (NEC) and/or State and Local guidelines.
WARNING
Failure to heed the following may result in injury or death.
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This section is only for qualified installers who are familiar with the swimming pool and spa safety standards.
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The installer must be familiar with service industry techniques.
NOTICE
Failure to heed the following may result in damage to equipment.
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The wire size connecting the heat pumps must be 22-gauge, 2-conductor,
low-voltage wire. Be sure that the size of the wire will allow at least two
wires per connection point.
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Do not attempt to connect heat pump equipment in multiple configurations
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.
DO NOT CONNECT
HP7 or HP7R boards
Figure 7
Connecting Multiple Heat Pumps
Dry Contact Connection
Points to the Microprocessor
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.
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Note - The primary unit can be connected to an external
controller via the "smart bus" (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.
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