Aquacal HP7R User manual

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1/7/04
PN: LTP0023
11/7/06
REV: 2/19/07
&7
Operating&ServiceInstructions...
HP7R
Microprocessor Controller
Dealer&ServiceVersion
Not for Distribution to Owners
2737 24th Street North
St. Petersburg, FL 33713
800-786-7751
www.aquacal.com

2
1-800-786-7751 NOTES
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TABLE OF CONTENTS
QUICK START & STOP-------------------------------------------------04
HEATER CONTROLS-------------------------------------------------- 06
Control Panel Layout -----------------------------------------------06
Buttons, Lights, and Display --------------------------------------06
Operational & Programming Codes--------------------------------07
Level-1 (Owner-Operator) Programming (complete) -------------08
CONTROLS CONFIGURATION & ADJUSTMENTS----------------------12
Level-2 (dealer-service) Programming----------------------------12
1. Entering Service Menu---------------------------------------12
2. Time Delay ---------------------------------------------------13
3. Configuring for External Controllers-------------------------13
4. Water Sensor Calibration ------------------------------------13
5. Defrost Sensor Calibration-----------------------------------14
6. Spa Dead Band Differential (and adjustment)--------------15
7. Pool Dead Band Differential (and adjustment) -------------15
8. Changing Service Lock Code & “Back Door” Entry----------16
Connecting External Controllers-----------------------------------16
Level-2 Set Up & Calibration Codes -------------------------------17
Factory Default Settings -------------------------------------------17
Troubleshooting Using Displayed Codes --------------------------18
Mode Jumper and Positioning -------------------------------------19
Defrost Systems (described and explained) ----------------------21

4
HEATING-QUICKSTART&STOP
Getting Started
(Quick-Start & Stop Continued Next Page)
1. Verify Electrical Power is Present at Heater:
A. Ensure that the unit has electrical power connected; the heater controller display should be
illuminated.
B. If the display is blank, be certain the electrical breaker, and heater disconnect, are switched to
“ON.”
C. For now, leave the water circulation pump OFF.
A. The user/owner settings can be made without water flowing. Once the heater has electrical
power connected, with water not flowing, the display should read FLO.
B. Press the MODE button until the HEAT (HEA) indication displays. This action will enable the
remaining programming keys.
C. Using the POOL / SPA selector key, select the POOL mode.An illuminated POOL indicator
light, located on the left side of the display, will confirm the POOL control has been selected.
If heating only a spa, using the DOWN arrow key, lower the POOL temperature until OFF is
displayed; then proceed to Step-“E.”
D. Use the UP / DOWN arrow keys to set the desired water temperature for the POOL water.
E. If the heat pump will be used to heat a spa, use the POOL/SPA selector key to select SPA,
then use the UP / DOWN arrow keys to set the desired water temperature for the SPA.An
illuminated SPAindicator light, located on the left side of the display, will confirm the SPA
control has been selected. If heating only a POOL, using the DOWN arrow key, lower the
SPA temperature until OFF is displayed.
F. The heat pump controls are now set to maintain the desired water temperature for the POOL
and/orSPA.
2. Set the Heater Controls (Refer to Control Panel Layout, Pg-6):
OWNER- If heater is connected to a Call-Flex controller, also see “Selecting Call-Flex Pump
Options,” located later in this manual.
INSTALLER- Is heater connected to an external controller? If so, see external controller
information located on pages-13 & 16 of this manual.
NotetoDealer/Installer:This, and the“OwnerLevelProgramming”sectionswere originally writ-
tenforusebythehomeowner/operator.Assuch, much of the language will be owner-directed.
The intent of this section is to provide rapid access to very basic operational information. Indi-
vidualswhowillberoutinelyusing,installing,maintaining,andservicingtheheatpump,arestrongly
encouragedtoreadthisentiremanual.
Herein, the terms: Heat Pump, Heater, and Unit are used synonymously. The instructions
contained within this section are intended for local control of a heat pump, independent
of an external controller. See pages-13&16iftheheater is, orwillbecontrolledbyanexternal
controller.

5
NOTE: THE HEATER CONTROLLER INCORPORATES AN ANTI-SHORT CYCLE TIME DELAY. SHOULD OPERATION BE
INTERRUPTED, RESTART WILL BE DELAYED BY APPROXIMATELY 4-MINUTES.
HEATING-QUICK START & STOP (continued):
(End...Quick-Start & Stop)
6. To Stop the Heat Pump:
A. Select: OFF via the MODE selector. This method of shut down preserves the controller
settings;
B. An interruption of water flow–such as when a pump timer is in control–will also halt heat
pump operation.
5. Continuous Usage and Water Around Heater:
Condensation... After the heat pump has been operating for some time, water may be observed
surrounding the heater. The moisture seen is condensation produced as a normal by-product of
transferring heat from the air into the pool or spa water. Quantities of 6-8 gallons of water produced
per hour are common if the air humidity is high. Conversely, a low humidity condition may result in
no condensation being produced. (If water around unit seems excessive, to troubleshoot, see
the “water coming from unit” troubleshooting section of the full heat pump manual.)
4. Program Filter Pump Run Time:
Most pool/spa systems utilize a timer or multifunction controller to manage filter pump run times.
If your system incorporates such a device, follow the instructions below:
A. It will be necessary to allow the filter pump to run continuously until the water has reached the
desired temperature. If a timer controls the pool filter pump, it will be necessary to override
the timer to allow 24-hr. operation.
B. Once the desired temperature has been obtained (1-4 days), reset the pump control device.
Colder months require longer running times–generally eight to twelve hours/day.
C. A heat pump can only operate when the filter pump is running. Therefore, it may be
necessary–during cooler weather–to extend the water pump’s hours of daily operation.
The increased run time is necessary in order to keep up with increased, weather-related
heat losses.
3. To Begin Heating:
A. Verify MODE is set to: HEAT (HEA); then, depending on which body of water is to be heated,
use the POOL / SPA selector key to select POOL or SPA.
B. Position external water valves appropriately to flow water to & from the body of water and
through the heater.
C. Start the water pump; the fan will start, and within 4-minutes (depending on the status of the
controller’s internal time delay) the unit will begin heating. The selected body of water will be
brought to temperature and maintained per the setting determined previously in: “Set the
Heater Controls.”
D. In operation, whenever the actual (displayed) water temperature falls below the desired set
point, after an initial time delay of 4-minutes, the unit will begin heating.

6
HEATERCONTROLS
Control Panel Layout
(APPEARANCE VARIES BY MODEL)
Control Buttons, Indicator Lights, & Display
(AS INDICATED BY CIRCLED NUMBERS)
1) POOL / SPA SELECTOR – Selects either pool or spa thermostat.
2) COOLING INDICATOR LIGHT – Indicates unit is cooling. (Note: this light
nonfunctional with heat-only models.)
3) UP ARROW – Increases temperature setting. (Maximum setting is 104 oF)
4) DOWN ARROW – Decreases temperature setting. (Minimum setting is 45 oF)
5) HEATING INDICATOR LIGHT – Indicates unit is heating.
6) MODE SELECTOR – Used to select between the Heating, Cooling, Auto-
Changeover, and Off for Heat & Cool models. Used to select between Heating
and Off for heat-only models.
7) SPA INDICATOR LIGHT – Indicates heater is referencing spa thermostat.
8) POOL INDICATOR LIGHT – Indicates heater is referencing pool thermostat.
9) LED DISPLAY – Displays water temperature when no keys are being pressed.
Displays desired temperature when UP ARROW or DOWN ARROW is pressed.
Also displays operational, programming, and fault codes as applicable.
10) DESIRED TEMPERATURE LIGHT – Indicates temperature set point is being
displayed. Indicates temperature set point is being changed due to the UP
ARROW or DOWN ARROW being pressed.
11) WATER TEMPERATURE LIGHT – Indicates current water temperature is being
displayed.

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THE FOLLOWING CODES WILL BE DISPLAYED AS PART
OF THE NORMAL OPERATION OF THE HEATER:
Operational & Programming Codes
FLO..... No WaterFlowDetected.Thiscode appearswheneverthe circulatingpumpis off,orwhen
theheaterisnotreceivingcorrectwaterflow.
OFF..... SystemisOff.Thiscode appearswheneverheater hasbeenturned offviathe mode
selectorbutton,or whenthetemperatureset pointhasbeen loweredbelow45
o
F.
CFI...... Celsius/FahrenheitSelection.This isaprogramming entrypointtoselectinwhichformat
thewatertemperaturewill bedisplayed.
ULC..... UserLock Code.Thisis aprogrammingentrypoint; whenactivated,steps tothenext
menulevel:ELC.
ELC..... EnterLock Code.Thisa programmingentrypoint;permitsend usertoselect asecret
code,therebylimitingaccesstotheownersettings.
CFO..... CallFlex Options.Thisis aprogrammingentry point;whenused inconjunctionwith an
AquaCalCall/Flexaddon kit,permitstheuseofCALLorFLEXoptions.
FS....... Heaterin DefrostMode(ApplicabletoHeat-Only Units,only).Thiscodeappearsasa
normaldisplayduringperiodsoflowerairtemperatures. Sequencefollows:
Heat-OnlyDefrostSequence: Fancontinuesto runandcompressor isoff.Compressor
willrestartwhenaircoiltemperaturerisesto approximately38°F.
LOC..... Thisis aServiceEntry Point(notintendedforuse bytheowner). The[LOC]codepermits
servicepersonalto enterafactorycodeforaccesstoadjustablecalibrationandsite-
dependantsetupparameters.Serviceadjustmentsareavailabletoauthorizedinstallation
and service personnel,only.
HEATER CONTROLS...continued
Failure to heed the following may result in equipment damage
and voiding of manufacturer’s warranty.
CAUTION !
Heat pumps contain no owner-serviceable components. Owner-initiated adjustments, beyond
the controller “LOC” code, must not be attempted. If adjustments are deemed necessary, the
owner should contact installing dealer orAquaCal Customer Support at [phone].

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HEATER CONTROLS...continued
Start Up & Setting Operating Controls
Owner-Level Programming Instructions (Complete)
Covered within this section are features and settings typically accessed first by the installer, and then
remaining accessible by the end user (the owner). These features reside at the Level-1 access point
within the microprocessor. Note: if preferred, all programming may be performed without water flow,
waiting to start the water pump as the last step in the set up and run process.
1. Applying Power to The Controller:
A. When power is first applied, the controller performs a lamp test and the display will read
[888]. Following [888] the software version will display briefly.
B. The control will then display the actual water temperature, provided the circulating pump is
operating, and adequate water is flowing through the heater.
C. If the pool-circulating pump is off, the control will display: [FLO]. This code message
indicates no (or insufficient) water is being circulated through the heat pump.
2. MODE Controls Explained, and Starting the Heat Pump:
A. Once electrical power is supplied to the heat pump, sufficient water is circulating, and the
heater controller has successfully completed its self-test, the heater is ready to operate.
B. The heat pump is shipped with the controller [MODE] function set to “OFF”. There are two
ways to switch the heat pump OFF: First Method- One of the functions of the [MODE]
button is “OFF”. Second Method- The thermostat set point can be lowered to a position
below the minimum temperature setting (45oF); this action will cause the display to read
“OFF”. To switch the unit ON, first use the mode button to select the HEAT mode—for Heat
Only models—or, if the heat pump is a Heat and Cool model, use the mode button to select
one of the following modes: HEAT, COOL, or ACH (Auto-Changer Over). In the [OFF] mode,
the actual water temperature will be displayed as long as the circulating pump is operational
and correct water flow is present. In the event water is not circulating through the heat pump
(or flow is insufficient), the controller will display the [FLO] (No Water Flow) code message.
C. Using the UPARROW key, increase the desired temperature until it exceeds the value of the
actual temperature displayed. (Note: See # “8,” later in this section, if “000” is displayed upon
pressing either the up or down arrow keys.) Once the desired temperature has been
entered, the display will read the actual temperature and the heat pump will start to operate.
Both the compressor and the fan must be operating before the “Heating” LED will illuminate.
(Note: When MODE function is OFF, the current water temperature will be displayed; no
functions, values, or programming will be available for adjustment.)
3. Turning The Heat Pump Off:
A. Method 1: using the [MODE] key, press the key until the display reads “OFF” The
heater will shut off and remain off until the [MODE] key is used the select an operational
mode. This is the preferred method for shutting off the heat pump.
B. Method 2: using the DOWN key, press the key until the desired water temperature reaches
45oF (minimum setting); then, press the DOWN key one more time, causing the display to
read “OFF”. This method is typically used in conjunction with 2-wire external controllers;
these controllers are equipped with their own thermostats. (Continued on Next Page)

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4. Selecting Pool/Spa Thermostat Settings:
A. Press the [POOL/SPA] key to toggle between the pool and the spa temperature set points.
B. The pool/spa LED indicator lights, located to the left of the temperature display, will confirm
the selected set point.
5. Changing The Pool Temperature Set Point:
A. Using the [POOL/SPA] key, select the POOL temperature set point. The pool set point
indicator light will confirm the selection.
B. The pool temperature set point is adjustable from a minimum of 45oF to a maximum of
104oF. Pressing the [UPARROW] key will raise the set point 1-degree for every push of the
button. Pressing the [DOWN ARROW] key will lower the set point 1-degree for every push
of the button.
HEATER CONTROLS...continued
Start Up & Setting Operating Controls
6. Changing The Spa Temperature Set Point:
A. Using the [POOL/SPA] key, select the SPA temperature set point. The spa set point indicator
light will confirm the selection.
B. The spa temperature set point is adjustable from a minimum of 45oF to a maximum of
104oF. Pressing the [UPARROW] key will raise the set point 1-degree for every push of the
button. Pressing the [DOWN ARROW] key will lower the set point 1-degree for every push
of the button.
7. Selecting Between oF and oC:
A. Simultaneously press and hold both the [UPARROW] and [DOWN ARROW] keys until
[CF1] (Celsius / Fahrenheit) code appears.
B. With the [CF1] code displayed, pressing the [UP ARROW] or [DOWN ARROW] keys will
change the selection code to either “0” or “1”. Select “1” for Fahrenheit temperature display,
or “0” for Celsius temperature display. Once the desired temperature display mode has
been selected, not pressing any buttons for 15-seconds will allow the controller to save the
selection and return to the normal operating mode. Pressing the {POOL/SPA] key will also
save the selection and step to the next menu parameter: [ULC] (User Lock Code).
8. User Lock Code Option [ULC]:
This Option Explained:
Heat pumps are shipped from the factory with the [ULC] option disabled. Enabling the [ULC]
function permits the heat pump owner to restrict access to the unit’s controls. With the [ULC]
function enabled, unless the correct ULC code number is entered, changes to Level-1
programming are not possible. (I.e.: Altering temperature set points, Pool/Spa selection, C/F
display changes, etc., will not be possible). The [ULC] option can be thought of as an electronic
lockable cover for the controls.
(Continued on Next Page)
Owner-Level Programming Instructions... continued:

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HEATER CONTROLS...continued
Start Up & Setting Operating Controls
(ULC Continued on Next Page)
8. User Lock Code Option [ULC]...continued:
A. Selecting ULC Option:
1) Press either the UP or DOWN ARROW keys; if “LOC” is momentarily displayed flowed
by “0”, the ULC feature is enabled. If “0” displays proceed to “6)” of this section;
otherwise, see number “2,” below.
2) Simultaneously press and hold both the [UP ARROW] and [DOWN ARROW] keys until
[CF1] (Celsius / Fahrenheit) code appears.
3) Press the [POOL/SPA] key once to display [ULC].
4) With [ULC] displayed, pressing either the Up or DownArrow key will display either “1” or
“0”. Selecting “0” will allow the keypad to remain unlocked. Selecting “1” will enable the
User Lock Code option. Then to enter a lock code number, press the [POOL/SPA] key
once to display [ELC] (Enter Lock Code).
5) With [ELC] displayed, use the Up or Down arrow keys to select a lock code. The code
can be any number from “00” to “99”. The factory set lock code is “0”. Not pressing any
buttons for 15-seconds will allow the controller to save the selection and return to the
normal operating mode. Pressing the {POOL/SPA] key will also save the selection, and
will step the controller to the next menu parameter: [CFO] (Call Flex Options).
6) Once the ULC option has been enabled, pressing any key will momentarily display
“LOC” followed by “0” (prompting the entry of the correct lock code number). To gain
access to the controller:
a. Using the [UP ARROW] key, scroll to the correct lock code number, then;
b. Press the [POOL/SPA] key… Current water temperature will be displayed… Control
setting can now be viewed or changed as desired.
c. After a period of approximately four (4) minutes, during which time no buttons have
been pressed, the controller will automatically return to the locked mode. Provided
ULC selection is set to “1,” the controller will always fail-safe in the locked mode.
d. Without knowledge of the correct lock code, and with the ULC enabled, control
adjustments will not be possible. Be certain to record the lock code in a safe
place. The lock code may be changed any number of times by following the
instructions detailed in this section.
Owner-Level Programming Instructions... continued:
B. De-Activating the User Lock Code [ULC] function:
1) Following the instructions detailed previously at: “8, 6)”, press any key and enter the
user lock code number; then press the [POOL/SPA] key.
2) Immediately following the entry of the user lock code, simultaneously press and hold the
[UP ARROW] and [DOWN ARROW] keys until the code [CF1] appears on the display.
3) Then, use the [POOL/SPA] key to scroll to the [ULC] message; press the [DOWN
ARROW] key to change the display to “0”. This will disable the User lock function.

11
HEATER CONTROLS...continued
Start Up & Setting Operating Controls
9. Selecting Call-Flex Pump Options [CFO]:
GeneralInformation:
The Call-Flex option automatically adjusts 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 circulator 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. Call-Flex is a dealer-installed option that does not
come with every heater; if unsure, check with the installing dealer to determine if a call-flex kit
was part of the original installation. If Call-Flex was not part of the installation, and you would like
to have Call-Flex added, your dealer can do so...contact the installing dealer.
If the installation is equipped with the Call-Flex option, the following steps are used to control the
Call-Flex features:
A. Simultaneously press and hold the [UPARROW] and [DOWN ARROW] keys until the
display shows “CF1”. Press the [POOL/SPA] key three times to scroll the display to [CFO].
B. With the [CFO] (Call-Flex Options) code displayed, use the Up or Down keys to select “0” to
disable the Call Flex Options, “1” to enable the Call Option, or “2” to enable the Flex Option.
Not pressing any buttons for 15-seconds will allow the controller to save the selection and
return to the normal operating mode. Pressing the {POOL/SPA] key will also save the
selection, and will step the controller to the next menu parameter: [LOC] (Service Lock
Code).
C. For further information, please refer to Call-Flex installation instructions, shipped with the
Call-Flex kit. For additional copies of these instructions, contact theAquaCal Customer
Support(800-786-7751).
C. User Lock Code is Activated, but Pass Number is Not Known (“Back Door Entry”):
Note: Should the ULC option be enabled, and a lock code number other than the factory
default (0) be installed but is unknown, the following procedure may be followed to regain
controller programming access:
1) Simultaneously press and hold the [POOL/SPA] and [UPARROW] keys until the display
shows “888”. This operation will reset the controller to the factory default settings.
2) When reset to the factory default settings the user lock code [ULC] is deactivated and
the user lock code number [ELC] is reset to “0.”
3) In addition, all other settings are returned to the factory defaults. If an external controller
is in use, see External Controller programming on page-16 of this manual, or contact
AquaCal Technical Support Group (800-786-7751); ask for assistance with re-
configuring the controller for use with an external controller.
(End... Owner-Level Programming Instructions)
Owner-Level Programming Instructions... continued:

12
1. Entering Service Menu:
A. To enter the service menu, Simultaneously press and hold both the [UPARROW] and
[DOWN ARROW] keys until [CF1] (Celsius / Fahrenheit) code appears. (Note: if “000”
displays, the User Lock Code is enabled, and the ULC pass code must be entered before
proceeding. See Owner-Level Operating Instructions, page-9: “User Lock Code Option
[ULC].” If the owner’s ULC pass code is unknown, the factory default code “0” may be used
to access controller programming.) Press the [POOL/SPA] key four times to display [LOC],
which is the entrance point for the Service Menu.
B. The [LOC] code function allows service personnel to use an access code to enter the
service menu. This section of the programming is intended for authorized factory service
personnel, only.
C. Using the [UP] and [DOWN] arrow keys, scroll the displayed number to “50.” (“50” is the
default service entry pass code.)
D. Once the correct service code is displayed, pressing the [POOL/SPA] key–once again–will
allow access to the service menu.
E. The first service parameter displayed will be [dEL] (4 -minute time delay on make).
NOTE: Pressing the [POOL/SPA] key will save the displayed value in any menu parameter,
and will advance to the next service menu juncture.
Controls Configuration & Adjustments
Level-2 (Dealer-Service) Microprocessor Programming
(Includes Configuration for External Controllers)
Failure to heed the following may result in equipment dam-
age and voiding of manufacturer’s warranty.
CAUTION !
Heat pumps contain no owner-serviceable components. Owner-initiated adjustments, beyond
the controller “LOC” code, must not be attempted. If adjustments are deemed necessary, the
owner should contact installing dealer orAquaCal Customer Support at [phone].
Level-2 programming involves configuring the controller for specific site characteristics. To explain,
this programming is where the controller is set to operate with, or without, an external controller;
where sensor calibrations are performed; and where changes to other factory default parameters are
made.
Before transferring useof the heater tothe owner, the installer mustinsure thecontroller programming
is compatible with any site-installed external controllers, and that the heater starts and operates per
the manufacturer’s specifications.
Generally speaking, the installer’s main focus within Level-2 programming will be in configuring for
external controller compatibility.And, unless instructed to do otherwise by the AquaCal Technical
Support Group, the installer should not adjust sensor calibration or dead-band values.
(Continued on Next Page)

13
2. Time Delay [dEL]:
A. With the [dEL] (4 minute time delay) code message displayed use the [UP] or [DOWN]
arrow key to select either “1” to allow the time delay to remain active or “0” to deactivate the
time delay. Not pressing any buttons for 15 seconds will allow the controller to save the
selection and return to the normal operating mode. Pressing the {POOL/SPA] key will also
save the selection and step to the next menu parameter: [JAO] (External Controller
Interface).
B. CAUTION!!!: The time delay should only be deactivated for service convenience and must
be reactivated prior to placing the heat pump back is service. Failure to reset the time delay
feature could result in permanent damage to the heat pump compressor.
Controls Configuration & Adjustments...
Level-2 Microprocessor Programming... continued:
4. Water Sensor Calibration [tSC]:
If it is believed the displayed pool or spa water temperature does not match the actual
temperature, follow the steps below to verify and adjust the controller as necessary. Be certain
to use an accurate thermometer:
A. With the circulating pump in operation, and water moving through the heater, use a reliable
thermometer to measure the temperature of the pool or spa water. Be sure to measure the
water temperature away from returns. The object is to accurately determine the temperature
of the water entering the heater.
B. Once you have measured the water temperature, compare the result to the heater’s
displayed water temperature. If the water temperatures are the same or within 1oF, no
calibration is necessary. If the temperatures differ by 2 to 3oF, calibration is necessary.
Perform calibration procedure as follows:
NOTE:
(Continued on Next Page)
ALL FLOW SWITCH KITS PRODUCED BY AQUACAL ARE SHIPPED WITH FULL INSTALLATION
AND PROGRAMMING INSTRUCTIONS. PLEASE CONTACT AQUACAL CUSTOMER SUPPORT
(800-786-7751) IF ADDITIONAL COPIES OF THESE INSTRUCTIONS ARE NEEDED.
3. Configuring for External Controllers [JAO] or [FS2]:
A. Configuring for External Controllers Using [JAO] Selection:
1) Follow the steps 1, A through 1, D to enter the service menu. Once [dEL] is displayed,
press the [POOL/SPA] key until the display shows [JAO].
2) With the [JAO] (External Controller Interface) code message displayed, use the [UP] or
[DOWN] arrow keys to select either “0” to disable the External Controller Interface, “2” to
connect a thermostat type controller (2-wire connection).Apply [FS2] configuration to
connect a thermostat selector type controller (3-wire connection); see “3. B,” below. Do
NOT use [JAO] “3.”
B. Configuring Remote Flow Switch / Automatic Thermostat Switching Using [FS2] Selection:
1) Follow the steps 1, A through 1, D to enter the service menu. Once [dEL] is displayed,
press the [POOL/SPA] key until the display shows [FS2].
2) With the [FS2] (Remote Flow Switch / Automatic Thermostat Switching) code message
displayed, use the [UP] or [DOWN] arrows to select either “0” to disable Remote Flow
Switch / Automatic Thermostat Switching, “1” to enable Remote Flow Switch / Automatic
Thermostat Switching.
NOTE:FOR WIRING TO AN EXTERNAL
CONTROLLER,REFERENCE DOCUMENT
LTP0050 SHIPPED WITH HEATER.

14
4. Water Sensor Calibration... continued:
C. Follow the steps 1, A through 1, D to enter the service menu. Once [dEL] is displayed, press
the [POOL/SPA] key until the display shows [tSC] (Water Temperature Calibration). Using
either the [UP] or [DOWN] arrow keys, calibrate the water temperature sensor by increasing
or decreasing the numeric value displayed to match the measured water temperature. The
controller can be adjusted to +10oF to –10oF from the nominal displayed temperature.
However, offset calibrations greater than 3oF should be avoided… Such large offsets
generally indicate problems with the method of water temperature measurement, a water
sensor not properly inserted into the well, or other equipment issues. Do NOT attempt to
mask such issues through offset calibration.
D. Once the corrected temperature is displayed, Not pressing any buttons for 15-seconds will
allow the controller to save the selection and return to the normal operating mode. Pressing
the {POOL/SPA] key will also save the selection and step to the next menu parameter:
[dSC] (Defrost Sensor Calibration).
Controls Configuration & Adjustments...
Level-2 Microprocessor Programming... continued:
(Continued on Next Page)
5. Defrost Sensor Calibration [dSC] (Checking-Adjusting):
In the event it is suspected the defrost Sensor requires calibration, the following steps must be
followed closely to ensure correct defrost operation:
A. Turn the heater OFF at the main circuit panel.
B. Remove the heater front panel to gain access to the defrost sensor location. The defrost
sensor will be found strapped to the suction line in combination with the TXV bulb, or
strapped and separately insulated nearby the TXV bulb. Note: if unsure of sensor location,
follow–to termination–the pair of wires leading from the “FS” terminals on the controller PC
board.
C. Position a clamp-on, thermocouple-type temperature sensor onto the suction line; position
the clamp immediately adjacent to the defrost sensor. Connect the clamp-on thermocouple
to a multimeter designed to accept the input of the clamp-on device.
D. Restart the heater, allowing the compressor to operate for at least 10-minutes; the suction
line temperature should have stabilized at this point. Make note of the suction line
temperature as measured by the clamp-on thermocouple probe/multimeter.
E. Follow steps 1, A through 1, D to enter the service menu. Once [dEL] is displayed, press
the [POOL/SPA] key until the display shows [dSC] (Defrost Sensor Calibration). With [dSC]
displayed, pressing either the [UP] or [DOWN] arrow key, once, will display the current
temperature value of the defrost sensor.
F. Compare the controller’s displayed defrost sensor temperature against the reading obtained
by the clamp-on device. If the temperatures are the same, or within 1oF, calibration is NOT
necessary. If the temperatures differ by 2 to 3oF, calibration is necessary. The controller can
be adjusted to +10oF to –10oF from the nominal displayed temperature. However, offset
calibrations greater than 3oF should be avoided. Such large offsets generally indicate
problems with the method of suction line temperature measurement, a defrost sensor not
properly attached to the suction line, or other equipment issues. Do NOT attempt to mask
such issues through offset calibration.

15
Controls Configuration & Adjustments...
Level-2 Microprocessor Programming... continued:
5. Defrost Sensor Calibration... continued:
G. Once the correct temperature value has been selected, not pressing any buttons for
15-seconds will allow the controller to save the selection and return to the normal operating
mode. Pressing the [POOL/SPA] key will also save the selection and step to the next menu
parameter: [dBS] (Dead Band for Spa).
6. Spa Dead Band Differential [dBS]:
In the heating mode, the dead band differential determines the number of degrees the water
temperature must fall below the set point before the thermostat closes. In the cooling mode, the
dead band differential determines the number of degrees the water temperature must rise above
the set point before the thermostat closes. When in the auto-changeover mode, the dead band
differentialoperates inthe samemanner asdescribed abovefortheheatingandthecooling modes.
However, in all modes, the thermostat will open when the set point is reached independent of the
direction the water temperature is changing. The factory spa dead band differential is set to 1oF. It
is strongly recommended the factory default of 1oF remain; however, if for some reason the dead
band requires adjustment, follow the steps outlined below:
A. Follow the steps 1, A through 1, D to enter the service menu. Once [dEL] is displayed, press
the [POOL/SPA] key until the display shows [dBS] (Spa Dead Band Differential).
B. With the service menu parameter [dBS] displayed, pressing either the [UP] or [DOWN]
arrow keys, once, will display the current setting. Using the [UP] or [DOWN] arrows keys will
increase or decrease the value respectively. The differential is adjustable in 1oincrements
from 1 to 5-degrees.
C. Once the desired dead band value has been selected, not pressing any buttons for
15-seconds will allow the controller to save the selection and return to the normal operating
mode. Pressing the {POOL/SPA] key will also save the selection and step to the next menu
parameter: [dBP] (Dead Band Pool).
7. Pool Dead Band Differential [dBP]:
In the heating mode, the dead band differential determines the number of degrees the water
temperature must fall below the set point before the thermostat closes. In the cooling mode, the
dead band differential determines the number of degrees the water temperature must rise above
the set point before the thermostat closes. When in the auto-changeover mode, the dead band
differentialoperates inthe samemanner asdescribed abovefortheheatingandthecooling modes.
However, in all modes, the thermostat will open when the set point is reached independent of the
direction the water temperature is changing. The factory pool dead band differential is set to 1oF. It
is strongly recommended the factory default of 1oF remain; however, if for some reason the dead
band requires adjustment, follow the steps outlined below:
A. Follow the steps 1, A through 1, D to enter the service menu. Once [dEL] is displayed, press
the [POOL/SPA] key until the display shows [dBP] (Pool Dead Band Differential).
B. With the service menu parameter [dBP] displayed, pressing either the [UP] or [DOWN]
arrow keys, once, will display the current setting. Using the [UP] or [DOWN] arrows keys will
increase or decrease the value respectively. The differential is adjustable in 1oincrements
from 1 to 5 degrees. (Continued on Next Page)

16
Controls Configuration & Adjustments...
Level-2 Microprocessor Programming... continued:
7. Pool Dead Band Differential... continued:
C. Once the desired dead band value has been selected, not pressing any buttons for
15-seconds will allow the controller to save the selection and return to the normal operating
mode. Pressing the {POOL/SPA] key will also save the selection and step to the next menu
parameter: [LOC] (LOCK CODE).
8. Changing the Service Lock Code and “Back Door” Entry:
A. Changing the Code…
The factory default Service Lock Code is “50”. Service personnel are strongly advised to
retain the factory default setting. However, should unauthorized access to Level-2 (Service)
menu be suspected, it may be necessary to select a code other than “50”. To change the
Service Lock Code:
1) Follow the steps 1 A through 1 D to enter the service menu. Once [dEL] is displayed,
press the [POOL/SPA] key until the display shows [LOC] (LOCK CODE).
2) Press the [UP] arrow key to display the current service lock code value. With the current
value displayed the [UP] arrow key will increase the value while the [DOWN] arrow key
will decrease the value. When the desired value is displayed not pressing depressing
any buttons for 15-seconds will allow the controller to save the selection and return to
the normal operating mode. Pressing the {POOL/SPA] key will also save the selection
and step to the next menu parameter. It is recommended, however, unless
attempting to prevent tampering, that the factory setting of: “50” remain in use.
B. Back-door Access (For use when correct Service Lock Code is unknown):
1) Simultaneously press and hold the [POOL/SPA] and [UPARROW] keys until the display
shows “888”. This operation will reset the controller to the factory default settings.
2) The factory reset will change the service lock code back to the factory setting “50”. In
addition, all other settings (including external controller configuration) are
returned to the factory defaults. See section in this manual entitled: “Factory Default
Settings” for a complete list of factory default parameters.
(End... Level-2 Microprocessor Programming)
Connecting External Controllers
•See document entitled: “Connecting External Controllers toAquaCal Heat Pumps”; this
document is shipped with every AquaCal heater. For extra copies, contactAquaCal Customer
Support (800-786-7751); request literature piece: “LTP0050.”
•For Call-Flex option, reference instructions received with the Call-Flex kit.
•Please contact theAquaCal Technical Support Group (800-786-7751) concerning the application
of any external controller, Call-Flex, sequencing control, etc.

17
Controls Configuration & Adjustments...
Microprocessor Factory Default Settings
Level –1 and Level-2 Default Settings
Microprocessor Level-2 Set Up & Calibration Codes
Service Adjustable Parameters
Code Description Factory Setting Range
[LOC] Service Lock Code 50 00-99
[dEL] 4-minute Delay on Make 1 0 / 1
[JAO] External Controller Interface 0 0 / 2 / 3
[FS2] Flow Switch/Auto T-Stat Switching 0 0 / 1
[tSC] Water Sensor Calibration Factory Calibrated +10oto –10oof display
[dSC] Defrost Sensor Calibration Factory Calibrated +10oto –10oof display
[dBS] Spa Dead Band Differential 1o1
oto 5o
[dBP] Pool Dead Band Differential 1o1
oto 5o
Menu Code Description Default Value Range
Level-1 [CF1] Celsius/Fahrenheit 1 0 / 1
Level-1 [ULC] User Lock Code 0 0 / 1
Level-1 [ELC] Enter Lock Code 0 00-99
Level-1 [CFO] Call / Flex 0 0 / 1 / 2
Level-1 [LOC] Service Lock Code 50 00-99
Mode Key Pad Operating Mode OFF For Heat Only: OFF/HEAT
For Heat & Cool:
OFF, HEA, COO, ACH
Thermostat Key Pad Thermostat Settings Pool & Spa OFF 45oF – 104oF
Level-2 [dEL]
Anti-Short Cycle, 4-minute Delay
on Make 1 0 / 1
Level-2 [JAO] External Controller Interface 0 0 / 2 / 3
Level-2 [FS2] Flow Switch / Automatic
Thermostat Switching 0 0 / 1
Level-2 [tSC] Water Sensor Calibration Factory Calibrated +10oto –10oof displayed
value
Level-2 [dSC] Defrost Sensor Calibration Factory Calibrated +10oto –10oof displayed
value
Level-2 [dBS] Spa Dead Band Differential 1o1
oto 5o
Level-2 [dBP] Pool Dead Band Differential 1o1
oto 5o

18
Message Error Description Possible cause
[dPO] Defrost Sensor Open Cut or loose sensor wiring
[PO] Water Temperature
Sensor Open Cut or loose sensor wiring
[dPC] Defrost Sensor Shorted Short circuit in defrost sensor wiring or defective sensor.
[PC] Water Temperature
Sensor Shorted Short circuit in water temperature sensor or defective sensor.
[LP] Refrigerant System Low
Pressure Switch Open System refrigerant charge low, defective low pressure switch, clogged evaporator coil, or defective wiring.
[HP] Refrigerant System High
Pressure Switch Open Low water flow, defective high pressure switch, or defective wiring.
[HP5] 5 High Pressure Faults
Within One Hour (Unit
Locked) See causes for [HP]
[LP5] 5 Low Pressure Faults
Within One Hour (Unit
Locked) See causes for [LP]
[OTA] Over Temperature Alarm<
Temperature over 110oF
(Unit Locked)
Defective compressor contactor, defective controller, or defective water
temperature sensor
[FLO] Low or No Water Flow
Detected Circulating pump off or filter dirty, isolation valves set improperly, defective or improperly set heater water pressure switch
[FS] Heater in Defrost Mode Normal function in lower air temperatures. Fan continues to run and
compressor is off. Compressor will restart when air-coil temperature
reaches 38oF or above.
[CSE] Control System Error
Controller may need to be reset. Disconnect then reconnect power to
controller. If error continues replace control board, display board, or both.
Troubleshooting Using Displayed Codes
Interpreting Error Codes
The HP7R heat pump microprocessor controller is designed to be self-diagnostic through the display
of various fault codes.
Owners & Operators: If you believe you are experiencing a problem with the heater, and feel a need to
call the factory for assistance, it will be beneficial to let the factory Service Representative know which
codeis being displayed.Having this informationat handwillpermit theService Representative towork
through–withyou–anysite related issuescausing or contributingto the problem. Then,if after working
through site-related issues the heater is still not functioning correctly, the Service Representative will
offer to set up a service visit.As necessary, please ContactAquaCal Customer Support Group (800-
786-7751).
Dealers and Service Centers: For troubleshooting use, listed below are all possible fault messages
output by the microprocessor, what the codes mean, and possible causes with solutions for the
indicated problem. Please contactAquaCal Technical Support Group, as necessary (800-786-7751).
Controls Configuration & Adjustments...
WARNING ! Failure to heed the following may result in permanent
injury or death.
Heat pumps contain no owner or operator repairable components. Repairs must not be
attemptedby untrained and/orunqualified individuals. If serviceis deemednecessary, contact
installing dealer orAquaCal Customer Support at [phone].
(HEAT-ONLY UNITS)

19
1. Apply electrical power to the heater.
2. Review the available modes by repeatedly pressing the [MODE] key:
A. Heat-Only Models: the [MODE] key functions should appear as: [OFF] and [HEA].
B. Heat-Cool Models (Icebreakers): the [MODE] key functions should appear as: [OFF], [HEA],
[COO], and [AHC].
3. If the modes do not display correctly for the heater being serviced, the mode selector jumper,
located on the microprocessor PC board, is likely placed in the wrong position. To correct this
condition, the jumper will need to be repositioned. See repositioning instructions, below.
Controls Configuration & Adjustments...
Microprocessor Mode Jumper Positioning
Mode Jumper Explained
The HP7R microprocessor is designed to operate as a Heat-Only or a Heating & Cooling controller.
The selection between the two choices is made through the positioning of a mode jumper contained
on the microprocessor board. The position of the jumper is set at the factory, and is dependant upon
the design of the heater being controlled. Heaters designed to heat only, have the microprocessor
modejumperset in theheat-only mode; heaterscapable of bothheating and cooling(reversing), have
their microprocessor mode jumper set to permit control of both heating and cooling.
Important: The position of the mode jumper must match the capabilities of the heat pump. Simply
placing the mode jumper to the heating and cooling position, with a heater designed to heat only, will
not make a heat-only heater heat & cool. In fact, a mis-positioned mode jumper will cause heater
control difficulties.
Verifying the Mode Jumper Position is Correct
1. To access the jumper, disconnect electrical power and remove the heater front entry panel; then,
remove the metal cover from heater electrical enclosure. For layout details of the PC control
board, see figures on next page.
2. Locate the mode jumper in the upper right hand corner of the PC control board; per the figures
on the following page, identify the correct location for the jumper. If the jumper is found to be
incorrectly positioned, gently disengage the jumper by pulling it directly away from the control
board.
3. Correctly reposition the jumper, leaving one pin uncovered. Note: The jumper should cover two
(2) pins: one always being the middle pin, and the other the correct pin for the features of the
heat pump.
Repositioning the Mode Jumper
Use this procedure if [MODE] key functions indicate jumper positioning is incorrect. The mode
jumper is located on the microprocessor controller board, within the heater’s electrical enclosure.
WARNING ! Failure to heed the following may result in permanent
injury or death.
This is NOT an owner or operator procedure. Repairs must not be attempted by untrained
and/or unqualified individuals. Risk of Electrical Shock… Ensure all electrical power to the
heater has been disconnected prior to removing the heater front access panel. Leave
electrical power disconnected throughout the following jumper repositioning procedure.

20
Controls Configuration & Adjustments...
Microprocessor Mode Jumper Positioning... continued: