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.

 

  • Deactivate power while routing wiring to control board.
  • Follow all National Electric Codes (NEC) and/or State and Local guidelines.

WARNING

Failure to heed the following may result in injury or death.

 

  • This section is only for qualified installers who are familiar with the swimming pool and spa safety standards.
  • The installer must be familiar with service industry techniques.

NOTICE

Failure to heed the following may result in damage to equipment.

 

  • 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.
  • 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.

    • 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.
  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

 

  1. Apply power to primary heat pump. Confirm the mode is set to "SYSTEM OFF".
  2. Apply power to the next heat pump and confirm the mode is set to "SYSTEM OFF". Do this for each heat pump.
  3. Program heat pumps with assigned addresses. See "Configuring Multiple Heat Pumps"

 

Configuring Multiple Heat Pumps

Primary Heat Pump

Confirm the first connected heat pump is designated as the primary unit.

Enter "Installer Menus", then proceed

 

 

 

Secondary Heat Pumps

Go to the next connected heat pump and configure it as a secondary unit with a heat pump address of "01". Each additionally connected heat pump will require a unique heat pump address ("02", "03", etc.)

Enter "Installer Menus", then proceed