4
External Controller Connection Overview
Most external controllers have similar features. However, there are two general interface connection categories:
Interface #1, using 2-wires; or Interface #2, using 3-wires. Shown within these instructions—beginning with
Interface Method #1 (2-wire)—are the two interface methods and corresponding model designations of typical
external controllers used in the pool/spa industry.
Representative Controllers Using a 2-Wire Connection to Heat Pump
INTERFACE METHOD #1
Personal Safety and Equipment Precautions
—CONTROLLERS EQUIPPED WITH OWN THERMOSTATS... USE HEAT PUMP A-B OR Y-Z TERMINALS —
WARNING!
WARNING!
Failure to heed the following may result in permanent injury or death.
Installation by unqualified persons may result in hazards to installer and others. These instructions are in-
tended for use by qualified installation technicians, familiar with electrical service industry safety standards and
methods. Installation to be performed by qualified individuals only. Follow all applicable codes and standards.
DISCONNECT ALL ELECTRICAL POWER PRIOR TO BEGINNING WORK.
Failure to heed the following may result in permanent injury or death.
SPECIAL NOTE... CONNECTING 3-WIRE CONTROLLERS TO DIGITAL HEAT PUMPS
Never connect a 3-wire controller to the heat pump “X-Y-Z” options terminals. Connect only to the “FS-2”
points on the microprocessor terminal strip. Connecting to the “X-Y-Z” options terminals may disable the heat
pump water temperature controls.
WARNING!
Failure to heed the following may result in damage to equipment.
Incorrect connection of wiring may damage heat pump or the pool/spa equipment. Damage to equipment
caused by incorrect wiring connections is not covered under the equipment warranty. If uncertain of the correct
wiring methods, contact AquaCal Technical Support Group before continuing installation: (727) 823-5642.
CAUTION!
1. Run (18-gage minimum) low-voltage wiring from controller to heat pump.
2. Locate “Controller Options” terminal block inside heat pump electrical controls enclosure
(See Figure-1 on Page-3).
3. Connect wiring from the controller’s low-voltage heater control terminals to heat pump “Controller Options”
terminals designated “A” and “B” (See Figure-2 on Page-5).
4. Turn heat pump thermostats all the way down.
5. Set heat pump thermostat mode switch to OFF position.
6. The external controller’s thermostats are now ready to control the heat pump.
Electromechanically-Controlled (Analog) Heat Pumps: 2-Wire Connection
(See Figure-2, Next Page)
PENTAIR
Compool
Intellitouch
All Aqualink 2, 4, and 8 Series
All Aqualink RS Series
All IT Series
Aqualink
JANDY
CP3400, CP3600, & CP3800
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