Lars Heaters
1. Turn power off to heater.
2. Remove factory jumper from terminal block.
3. Wire Aqua Plus 16v to the heater as shown.
4. Ensure toggle switch is in the ON position.
5. Set heater thermostats to maximum position.
to limit switches
remove jumper
Fusible Link
white
white
Hayward Heaters
Refer to the instructions in the heater manual for “2-wire Remote Thermostat” operation under “Remote Control
Connections” and the diagram on the below:
1. Turn off power to heater.
2. Wire Aqua Plus 16v to terminals 1 & 2 (see diagram).
3. Leave jumper attached to terminals 4 & 5.
4. Move “BYPASS” dipswitch on heater circuit board to “ON” position (up).
5. Turn heater power back on.
6. Switch heater to either “Pool” or “Spa” (it doesn’t make any difference which is selected, the Aqua Plus 16v
will take control).
7. Heater display should be “bO” (for “bypass On).
8. Heater will fire whenever Aqua Plus 16v requests (when Aqua Plus 16v “Heater” LED is illuminated).
Do not remove jumper
Terminal block located at
electrical junction box
Dipswitch located on heater
circuit board
PK
W
R
BK
R
ON
ºC
OFF
ºF
16
27
For the Hayward variable speed pump: The Filter relay is used to supply input power to the pump.
The relay will be on when the filter pump output is on. When the filter pump output is off, the relay will
be off. On , off and speed is controlled by commands sent to the pump.
Lowest Speed
This is the lowest speed that the variable speed pump is allowed to run at. It is used as the lower limit
in the Low Speed Settings Menu. Set lowest speed from 10% (default) to 50%.
Highest Speed
This is the highest speed that the variable speed pump is allowed to run at. It is used as the upper limit
in the High Speed Settings Menu. Also, this is the speed that the pump will run at during the first 3
minutes of operation anytime the pump has been off for more than 30 seconds. Set highest speed from
20% to 100% (default).
Flow Monitor
This feature will help protect the filter pump from damage due to no flow. When used with a Hayward
flow switch, the Pro Logic monitors the state of water flow when the filter pump is on. If no flow is
detected for more than 15 minutes, the Pro Logic will shut down the pool pump and the “Check
System” LED will indicate an error. The error will be cleared the next time the pump is turned on.
Freeze Protection
Freeze protection is used to protect the pool and plumbed equipment against freeze damage. If freeze
protection is enabled and the AIR temperature sensor falls below the freeze threshold (see below), the
Pro Logic will turn on the filter pump to circulate the water. If “Pool and Spa” is selected in the Pool/
Spa sub-menu (see page 18), the valves will also alternate between the pool and spa every 30 minutes
and the filter pump will turn off while the valves are turning. The chlorinator will not operate if freeze
protection is the only reason the pump is running.
Freeze Protection Speed
This menu only appears if freeze protection is enabled and the pump is configured for 2-speed or
variable speed pump operation. If the pump turns on due to freeze protection only, the pump will run
at this speed.
2-Speed pumps: Select high (default) or low speed operation.
Variable Speed pumps: Select the desired speed (from Filter Lowest to Filter Highest speed).
Freeze Protection Temperature
Select the temperature to be used for freeze protection. Temperature is adjustable from 33ºF-42ºF (1ºC-
6ºC). 38ºF (3ºC) is default. This threshold will be used for all outputs that have freeze protection
enabled.
External Input Interlock
When enabled, the filter pump will be forced off when the external input is active. Note that freeze
protection will have precedence over this feature.