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When heating the pool or spa you should check the following items as they are all
critical to the proper operation of the heater.

1. WATER FLOW

Make sure all pool filters and traps are clean since the unit requires a minimum water
flow in order to operate properly. The heater should and will not run unless the water
pump is running.  There is an internal water pressure switch that disables the heater
whenever the water pump is not supplying water flow.

2. WATER PUMP TIMER SETTING

Since the heat pump collects heat from the outside air, you want to set the water pump
timer to run during the hottest part of the day.  If you are heating the pool from “dead
cold” you may need to set the water pump timer to run 24 hours until the pool reaches
temperature, then reset the timer for a normal run time.  Run times are determined by
pool size, set pool/spa temperature and weather conditions.

3. THERMOSTAT SETTING & MODE SELECT BUTTONS

The LED display will show a constant readout of the actual cur-
rent water temperature.  To set the desired water temperature
press either the + or - thermostat buttons.  While adjusting the
set temperature, the LED will flash.  The flashing numbers will
indicate the thermostat setting.

If you have a spa you can press the spa mode button and set the desired spa tempera-
ture.  If you do not have a spa use the pool mode only.

4. OPTIONAL TIME CLOCK OVERRIDE SWITCH

The optional “Time Clock Override” control you can set the switch turn this switch ON
and the heater will start the water filter pump automatically whenever the water tem-
perature drops below the thermostat setting.

This option is best used when heating the pool from “dead cold” and
for maintaining water temperatures during non timed periods where
the pool is losing 8 to 10 degrees or more overnight.  The heating
mode select switch is best left in the OFF position during the warmer

parts of the swimming season. The optional time clock override feature is built into the
heater at the factory and can not be added later.  See the bottom of page 4 also.

Operational Instructions

Page 6

Summary of Contents for DIGITAL LOGIC AT800

Page 1: ...ONAL POOL SPA INSTITUTE V2 3 AT 2001 CalorexU S A LLC SWIMMING POOL SPA HEAT PUMPS NOTE Installers should see separate installation manual Model AT800 AT600 AT400 BLACK CABINET with DIGITAL CONTROL DIGITAL CONTROL DIGITAL CONTROL DIGITAL CONTROL DIGITAL CONTROLS S S S S ONLY ONLY ONLY ONLY ONLY DIGITAL LOGIC DIGITAL LOGIC DIGITAL LOGIC DIGITAL LOGIC DIGITAL LOGIC ...

Page 2: ... one of the most efficient ways to heat your pool or spa Your heat pump was manufactured by Calorex USA the very first company to produce swimming pool heat pumps Since making the very first pool heat pump some 24 years ago Calorex has become the industry leader in reliability and efficiency You can expect to get more use from your pool or spa investment with your new heat pump The heat pump will ...

Page 3: ...uid refrigerant in the air coil absorbs the available heat in the ambient air transforming it into a gas The refrigerant gas is then pumped into the compressor When this warmed gas is com pressed it intensifies or concen trates the heat like a magnifying glass in the sun This intensely hot gas is then pumped into the heat ex changer condenser where the actual heat transfer takes place As the pool ...

Page 4: ...art the water pump whenever the pool requires heat Once the pool is up to the set tempera ture the heater will stop and then 5 minuets later the water pump will stop When this button is set to the OFF mode the heater will operate only when the water pump is running during the timed period set on the water pumps time clock NOTE The time clock override works best if used during cooler weather condit...

Page 5: ...T MODE F DEFROST MODE F DEFROST MODE F DEFROST MODE F DEFROST MODE This readout indicates that the internal defrost safety control has disabled the heater During cold weather where the air temperature drops below approximately 45 to 50 degrees depending on humidity the low refrigerant pressure switch or defrost con trol is designed to disable the compressor only Once the unit is in defrost mode th...

Page 6: ...ED display will show a constant readout of the actual cur rent water temperature To set the desired water temperature press either the or thermostat buttons While adjusting the set temperature the LED will flash The flashing numbers will indicate the thermostat setting If you have a spa you can press the spa mode button and set the desired spa tempera ture If you do not have a spa use the pool mod...

Page 7: ...eat loss by as much as 80 and reduce heating costs as much as 50 Using a cover during the initial heat up period will greatly reduce the operational time needed 8 SPA HEATING When heating a spa it is advisable to not run the air blower or air inlet venturis during the initial heat up time Air blowers and venturis inject air into the water to create the spa therapy action During colder weather the ...

Page 8: ... is not restricted Make sure the unit can breathe well The cooler discharge air from the top should not accumulate and be drawn into the side air intake coils Keep all plants and shrubs trimmed away from the heater Make sure the front is accessible for future service 3 Do not allow lawn sprinklers to spray on the heater in any way Keep sprinkler heads away from the heat pump to prevent corrosion a...

Page 9: ...S IN THE POOL or SPA SKIMMER Chemicals placed in the skimmer will feed concentrated chemical or chlorine into the heat exchanger before it is diluted with the rest of the pool water Chemicals or chlo rine placed in the skimmer will dissolve and concentrate in the skimmer when the water pump is off and then send a super concentrated chemical solution through the heater every time the water pump res...

Page 10: ...dup A minimal air coil cleaning should be done as needed and at least two times per year If the heater is installed in a sandy or salty condition the air coil should be cleaned more frequently 3 To clean the air coil SHUT OFF ALL POWER then use a garden hose at low pressure without a pressure nozzle to lightly rinse the air coil in an up and down motion You can use a mild soap while rinsing to hel...

Page 11: ...required to shut off or turn on power to the heater 5 Confirm that all heater controls thermostat thermostat selector switch reset tripper and optional auto heat switch if so equipped are in the correct position 6 If any 3rd party control devices are installed on the pool spa system make sure they are functioning properly Factory service technicians will not diagnose 3rd party exter nal control de...

Page 12: ...uns T Stat Relay Does Not Close Heater Does Not Activate After Delay Period Try Again or Possible Bad Time Delay Possible Bad T Stat Board Pot or Sensor 1 Hour Time Delay Activates Water Temperature is Below Setting Water Temperature is Above Setting Compressor Starts Green Heating Light ON Time Delay Passes or Air Temp Increases Safety Control Resets Compressor Restarts or Below 45 to 50 F Air Te...

Page 13: ...out notice 2000 Calorex U S A LLC MEMBER NATIONAL POOL SPA INSTITUTE Pool Heat Pump Manufacturers Association MEMBER 5826 Corporation Circle Ft Myers Florida 33905 888 297 3826 www calorexusa com calorexusa earthlink net U S A L L C ...

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