Viconics HP727 User Manual

HP727

Single speed swimming pool heat pump controller

Operation manual

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1. General Description

2. Specifications

3. Installation Instructions

4. Electrical Wiring

5. Instrument Wiring

6. Instrument Identification

7. Operation

8. Service and Calibration

9. Troubleshooting

10. Defrost Cycle Sequence

11. Temperature Sensor Chart

12. Advanced Applications

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1. GENERAL DESCRIPTION

The HP727 is a powerful microcomputer control designed for use in an outdoor swimming pool heatpump. The control features 3
digit temperature display and 3 push button keys. All adjustments are performed by simple key operations. The HP727 controls the
main compressor contactor, the 3 evaporator fan speeds, and the water circulating pump. The HP727 monitors both evaporator and
water temperature using precise thermistor sensors for superior control.

The control features full diagnostics messages, simplifying both installation and service. The HP727 is an excellent alternative to
electromechanical controls offering improved water temperature control accuracy, accurate defrost control, anti-short cycle timer,
and solid-state reliability all in a single package.

The HP727 features three speeds fan motor control for optimum efficiency and minimum acoustic noise.

All calibration and user parameters are stored in an EEPROM memory. There are no trimmer potentiometer adjustments. All
adjustments including sensor calibrations are done through the front panel. The HP727 features full self-test diagnostic capability
and sensor re-calibration if needed.

The HP727 offers maximum corrosion and vibration protection. All printed circuit board interconnections are soldered. The main
PCB is dipped in silicone. This assures maximum board protection even underneath the PCB components, against humidity, air
pollutants, chlorine vapors and vibrations.

2. VICONICS HP727 SWIMMING POOL HEATPUMP CONTROL SPECIFICATIONS

OPERATING CONDITIONS:

Rated Operating Conditions: 33 °F to 120 °F; R.H. 0% to 100 %, Non-Condensing

Storage: - 40 °F to 120 °F; R.H. 0% to 100 %, Non-Condensing

PERFORMANCE:

Accuracy: ± 1.8 °F

Repeatability: ± 0.2 °F

Resolution: ± 1 digit

INPUTS:

Swimming Pool Water Return Temperature Thermistor Sensor ( 0 °F To 120 °F )

Evaporator Defrost Temperature Thermistor Sensor ( 0 °F To 120 °F )

Contact From Remote High Pressure Switch Dry Contact Input

Contact From Remote Low Pressure Switch Dry Contact Input

Contact From Main Flow Switch Dry Contact Input

Contact From Remote Spa Select Flow Switch Dry Contact Input

OUTPUTS:

Compressor Relay Output:: 1A @ 24 Vac

3 Speeds Fan Relay Outputs: 4A @ 240 Vac

Circulating Pump Relay Output: 1A @ 24 Vac

GENERAL:

• Complete Diagnostic Error Messages

• Display: 3 Digits Display 0.56" High

• LED Status Indicators: Pool mode LED, Spa mode LED and Heat on LED

• Power supply : 0 / 12 / 24 Vac center tap transformer ±10% 50\60 Hz

- 5 VA required on 12 Vac for controller only

- 100 VA maximum for 24 Vac power connection

• Dimensions: approx. 5.5" x 6.0"

• Weight: 700 gm (1.51 lb.)

• Protection Against Humidity: Unit dipped with silicone based conformal coating

• Connectors: 1/4" fast-on connectors; screw terminals for field connections

• cCSAus file # LR92123

Important note: Heatpump unit should not be operated when outdoor air temperature is near or under freezing point; or as
specified by manufacturer of heatpump.

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3. INSTALLATION INSTRUCTIONS

UNPACKING

Examine the package on reception for any signs of external damage it may have received during transit. If damage is found, notify
the carrier immediately. Notify manufacturer or their agent immediately of any deficiencies.

INSTALLATION:

Take care in handling the Printed Circuit Board ( PCB ) so as not to damage or scratch the silicone conformal coating. Damage to
this coating will affect the resistance to moisture and humidity.

Install the board to the front panel using # 6-32 screws. Push ( or remove ) the fast-on connectors at a right angle to prevent bending
the board connectors.

Align and install the lexan cover membrane to the metal door.

4. ELECTRICAL WIRING

CAUTION:

NO HIGH VOLTAGES ARE PRESENT ON THE TERMINALS OF THIS INSTRUMENT ( EXCEPT AT THE FAN RELAYS
TERMINATIONS ) PLEASE READ ALL THE INSTRUCTIONS IN THIS MANUAL CAREFULLY, AND HAVE THE WIRING

DONE BY A SKILLED PROFESSIONAL.

THE INSTRUMENT HAS UNDERGONE RIGOROUS TESTS AND VERIFICATIONS PRIOR TO SHIPMENT TO ENSURE
PROPER AND RELIABLE OPERATION IN THE FIELD. IT IS THE RESPONSIBILITY OF THE USER OR ELECTRICAL
PANEL DESIGNER TO INCORPORATE SAFETY FEATURES ( SUCH AS OVER / UNDER TEMPERATURE CUTOUT
DEVICES ) TO PROTECT THE ENTIRE SYSTEM FROM GENERAL FAILURES.

• All wiring must conform with local or national electrical code regulations.

• See fig. 2 for electrical wiring diagram

• Some wiring to the board is done using 1/4" fast-on connectors.

• The instrument should be wired before applying power !

• Power supply : 0 / 12 / 24 Vac center tap transformer ±10% 50\60 Hz

- 5 VA required on 12 Vac for controller only

- 100 VA maximum for 24 Vac power connection

• The instrument front panel needs to be splash proof, and protected against the elements.

• The HP727 electronic controller should be mounted inside the control panel is NOT waterproof. The electrical panel must

therefore be properly protected against rain, dust and excessive water vapor condensation.

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5. INSTRUMENT WIRING DIAGRAM

Wiring Diagram

Water sensor

Defrost sensor

High pressure switch

Closed = OK
Opened = high pressure

Low pressure switch

Closed = OK
Opened = low pressure

Flow switch

Closed = flow
Opened = no flow

Black

Black

Light Blue

Light Blue

Purple

Purple

HP727
Control Board

RLY1 RLY2 RLY3

12345678910 13 14 15 16 1711 12

FILTER

PUMP

Blue

Blue

Low (Red)

Med (Blue)

High (Black)

Yellow

Yellow

Remote switch

Pool (opened)
Spa (closed)

24 Vac

12 Vac

0 Vac

24 Vac transformer

24 Vac filter
pump contactor

Black & White

FAN

White
Brown

Black

Orange (240 Vac)

Red (208 Vac)

L1

L2 or Neutral

Brown

CAP

F

C

COMPRESSOR

S

R

C

24 Vac compressor
contactor

or

Ground

208 / 240 Vac

50 / 60 Hz

Herm.

L1

L2

Wiring727 .dsf

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6. INSTRUMENT IDENTIFICATION

Pool LED

Heat on LED

Spa LED

Increase key

Decrease key

Service / Select key

DESCRIPTION OF FRONT PANEL:

POOL LED: Indicates that the Pool setpoint is selected.

SPA LED: Indicates that the Spa setpoint is selected.

HEAT ON LED: Indicates that the pool heater ( heatpump compressor ) is on, heating the water.

DIGITAL DISPLAY: Normally displays the actual water temperature. In set mode displays other parameters.

SERVICE / SELECT KEY: Used to enter the service mode or select between Pool and Spa temperature setpoint.

INCREASE KEY ↑ : Increases the selected parameter value.

DECREASE KEY ↓ : Decreases the selected parameter value.

NOTE: The display may be changed in steps by pushing the ↑ or ↓ keys repetitively, or automatically by holding down the same key

longer.

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