
7
Programming Heat Pump Microprocessor
1. Make sure pool water pump is on.
2. Restore electrical power to heat pump.
3. Press and hold “UP” and “DOWN” keys, simultaneously, until “CF1” displays.
4. At “Pool/Spa” key, toggle until “LOC” appears.
5. Press “UP” key; go to “50.”
6. At “Pool/Spa” key, toggle until “FS2” appears.
7. Press “UP” key twice. The number “1” should display.
8. WAIT... Press no further buttons; the display should revert to water temperature within approximately
25-seconds.
9. External controller-to-heater interface is ready to test and use.
Operation
1. Set desired POOL and SPA water temperatures at heat pump controls.
2. When external controller selects POOL, the FS-2 circuit will be open; the heat pump controls will default
to the POOL water temperature setting.
3. When the external controller selects SPA, FS-2 circuit will be closed; heat pump controls will select SPA
water temperature setting.
Microprocessor-Controlled (Digital) Heat Pumps: 3-Wire Connection (continued):
CALL-FLEX KIT: The Call-Flex option is installed to automatically adjust the run time of the water circulator
pump, and heater, based upon changing weather conditions. Without Call-Flex, as weather conditions grow
progressively cooler during winter months, or when unusually cold weather occurs, the run duration of the circula-
tor pump may require manual adjustments to permit the heater to maintain or reattain desired water temperature
(the water pump must be running in order for the heater to operate). Likewise, without Call-Flex, one must
remember to reset the pump run controls following the cold weather event. The Call-Flex option greatly reduces
the need for seasonal, manually-made, pump run time adjustments.
The Call-Flex option is available through AquaCal, and can be installed during original site construction, or, as an
addition to an existing installation. For use with an analog-controlled heater, use Call-Flex Kit part number: 0030;
the part number for analog kit instructions is: LTP0012. For use with a digitally-controlled heater, use Call-Flex Kit
#0030LEDS; the part number for the digital kit instructions is: LTP0013.
Limited Function Controllers & Devices
In addition to use with full-function controllers, AquaCal heaters are designed to accept control from devices
having specific and limited uses. These devices are generally used in applications where a full-function pool/spa
equipment controller is not part of the pool/spa installation. Further, in some instances, the use of an external flow
switch—in lieu of the pressure switch normally supplied with the heater—may be indicated due to specific site
conditions.
The most common of these limited use devices are listed below, along with an explanation on their application.
While the actual installation instructions are not detailed, here, when purchased in kit-form from AquaCal, the
devices come supplied with full instructions. Should further information or a set of instructions be desired, please
contact AquaCal per the instructions shown at the bottom of this page.
EXTERNAL FLOW SWITCH KIT: There are several applications where it may be desirable to incorporate an
external flow switch into the design of a swimming pool and/or spa installation. Following are the primary applica-
tions of an external flow switch:
1. Automatic POOL/SPA Thermostat Switching;
2. Pool/Spa Elevation Higher than Heater (resulting in heater operating without water flow);
3. Two-Speed Pump in Use (and low-speed water pressure will not properly activate heater water pressure
switch).
AquaCal supplies an External Flow Switch Kit, part number: 0040S. The kit instruction part number is: LTP0014.
Obtaining Kit Technical Support or Copy of Kit Instructions
To Obtain a Copy of Kit Instructions: contact AquaCal Customer Support at: 727-823-5642. Ask for the specific
set of instructions referencing the “LTP” number provided above. For Kit Technical Support: contact AquaCal
Technical Support Group at: 727-823-5642. Ask to speak with a Technical Support agent; reference the kit being
worked with by description and part number listed above.
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