COMPUTHERM CPA20-6 and Ccirculation Pumps Instruction Manual

COMPUTHERM CPA20-6 and Circulation Pumps

General information

• The CPA low-energy circulation pumps are designed for the circulation of water in one-pipe, two-pipe, radiator-based, and underfloor heating systems. The permanent magnet motor and the modern electronic control of the pump enable the pump to adapt its performance to the current needs of the heating system automatically. Because of this, the energy consumption of these pumps is significantly lower than the consumption of conventional pumps, and they are classified as Energy Efficiency Class A pumps.
• CPA pumps can be used for circulating clean, dilute, non-aggressive, and non-explosive liquids that do not contain solid particles, fiber, or mineral oils. In heating systems, the water must comply with the relevant standards and requirements for the pump to be usable.

Advantages of the device:

• Automatic, self-regulating mode
• Low energy consumption
• Low noise level

Parts of the pump

1. Suction connector
2. Pump housing
3. Pressure connector
4. Engine cover
5. Data plate
6. Venting screw
7. Control panel

Type designation

Important warnings and safety recommendations

• Before using the device, study carefully the device’s operating instructions and make sure to follow the instructions carefully.
• This device is designed for indoor use. Do not use in a wet, chemically aggressive, or dusty environment, or in a place where it may be splashed by water, or where the ambient temperature may be below 0 °C or above 40 °C.
• The manufacturer is not responsible for any direct or indirect damage or loss of income that may occur during the use of the device.
• Make sure that the COMPUTHERM CPA20-6/CPA25-6 circulation pump is disconnected from the power supply during the installation!
• The device must be installed, put into operation, and maintained by a competent person and the necessary safety regulations must be followed! If you do not have the necessary knowledge and qualifications, please contact an official service.
• Modifying the device involves the risk of electric shock or malfunction!
• Make sure that the pump housing is not externally insulated, as this can lead to damage to the pump.
• Do not operate the pump empty, without liquid!
• The circulated liquid can be of high pressure or high temperature. Note this when assembling the device to avoid injuries!

Installing and commissioning the pump

• Attention! When starting the pump, make sure that the system is filled with water, and vented and that the pressure of the suction nozzle reaches the minimum inlet pressure (see Technical data).
• The pump can empty the remaining air on its own. To do this, switch it to level III for a few minutes
• when you turn it on, and the air will leave by itself. During this process, the pump may be louder than usual.

Changing the position of the electrical panel

The electrical panel of the pump can be rotated 90 degrees using the following steps:

1. Close the valves on the suction and discharge side and release the pressure.
2. Unscrew and remove the screws on the product.
3. Rotate the pump housing 90 degrees in the desired direction.
4. Screw back the 4 screws securing the electric panel of the pump.
5. Open the valves on the suction and pressure side.

Connecting the device to the heating network

Control panel

Night mode on/off button. (AUTO)
2| Display of current consumption (W).
3| Display of the 8 selectable levels.
4| Button to select the operating mode.

• The segment indicating the currently selected function is always lit on the display panel.
• By pressing the buttons, the pump switches to another operating function.

Selectable characteristic curves of the pump and their display

pump operates at a lower or higher power according to the current water demand.
I| Stage I.| In stage I, the pump operates at a constant speed according to the lowest curve.
II| Stage II.| In the II. stage the pump operates at a constant speed according to the medium curve.
---|---|---
III| Stage III.| In the III. stage, the pump operates at a constant speed according to the highest curve. Quick venting of the pump can be done in III. stage with the short-term operation.
BL1| Low proportional- pressure curve| The operating point moves up or down on the low proportional pressure curve according to the heating demand. The delivery height increases when the need increases, and decreases when the need decreases.
BL2| High proportional- pressure curve| The operating point moves up or down on the low proportional pressure curve according to the heating demand. The delivery height increases when the need increases, and decreases when the need decreases.

HD1

| Low Constant- pressure curve| The operating point moves on the low constant pressure curve according to the need. The transport height remains constant regardless of the need.

HD2

| High constant-pressure curve| The operating point moves on the low constant pressure curve according to the need. The transport height remains constant regardless of the need.

Night mode

• The COMPUTER CPA20-6 and CPA25-6 heating circulation pumps can also be operated in Night mode, with which significant energy savings can be achieved. Night mode can be used if the pump is installed in the forward branch of the heating system.
• When the water temperature sponsored by the pump drops by more than 10 °C within 2 hours, the pump automatically switches to the energy-saving mode, by stage I. characteristic curve. When the temperature is rises at least by 10 °C (regardless of the duration), the pump will return to the normal operating mode that was selected before the energy-saving mode was activated.
• Attention! If the power supply to the pump has been cut off for some time, the Night mode must be reactivated!
• Attention! If the pump is installed in the I., II., or III. use it in stage, then the night mode cannot be activated!
• To activate Night Mode, press the Night Mode On/Off button on the control panel. Then the button on the control panel will light up until you turn off the function by pressing it again.

Displaying errors

• In the part of the pump’s control panel marked with number 2 (Figure 2), instead of the consumption, the error code detected automatically by the pump is displayed. Unplug the device until the error has been eliminated.

E2 ó E4

(alternating)

| Phase outage

Solving possible errors

Error type| Control panel| Possibility of sources of error| Troubleshooting
---|---|---|---
1. The pump not operate.| The control panel does not light up.| The circuit breaker tripped| Reclosing the circuit breaker.
A fuse blew.| Replacing the fuse.
The pump has failed.| Replacing the pump.
The control panel lights up, but the pump does not operate.| The supply voltage is not correct.| Checking the supply voltage
The pump is stuck.| Removal of impurities.
2. Noise in the system.| Everything works as intended.| There is air in the system.| Venting the system.
The water flow is too high.| Reduction of transport height.
3. The pump is noisy.| Everything works as intended.| There is air in the pump.| Operating the pump,

it vents itself over time.

Low influence pressure.| Increasing influence pressure.
4. Unsatisfactory performance.| Everything works as intended.| Pump performance is too short.| Increasing transport height.

Mounting sizes

Product name

| Measurements (mm)
---|---
L1| L2| B1| B2| H1| H2| G
CPA20-6| 65| 130| 82| 130| 103| 127| 1”
CPA25-6| 90| 180| 82| 130| 103| 130| 1 1/ ”

2

Technical data

• Working voltage: 230 V AC; 50/60 Hz Max. medium temperature: +2 °C – +110 °C
• Max. working pressure: 10 bar
• Max free  air temperature: max. 40 °C
• Max. head: 6 m
• Max.   flow:   2.8 m3/h (CPA20-6), 3.2 m3/h (CPA25-6) Nominal width:  G 1” (CPA20-6); 1½” (CPA25-6)
• Port to port length: 130 mm (CPA20-6); 180 mm (CPA25-6)
• Motor performance: 5 – 45 W Energy label: “A”
• Insulation label: H
• Type of  the motor: induction motor
• Material of the motor : cast iron
• Material of the runner: PES
• Noise level : max. 45 dB
• EEI: ≤ 0.23

Suction connector pressure

Liquid temperature| Minimum inlet pressure
≤ +85 °C| 0,05 bar
≤ +90 °C| 0,28 bar
≤ +110 °C| 1,00 bar
In order to avoid condensation in the junction box and the motor, the recirculated liquid temperature must always be higher than the environment temperature

Environment temperature| Circulated liquid temperature
Min| Max
0 °C| 2 °C| 110 °C
10 °C| 10 °C| 110 °C
20 °C| 20 °C| 110 °C
30 °C| 30 °C| 110 °C
35 °C| 35 °C| 90 °C
40 °C| 40 °C| 70 °C

• The COMPUTER CPA20-6 / CPA25-6 type pump complies with the requirements of directives EMC 2014/30/EU, LVD 2014/30/EU, and RoHS 2011/65/EU.
• Manufacturer: Quantrax Ltd.
• Fülemüle u. 34., Szeged, H-6726, Hungary Phone: +36 62 424 133
• Fax: +36 62 424 672
• E-mail:iroda@quantrax.hu
• Web:www.quantrax.hu
• www.computherm.info

Documents / Resources

| COMPUTHERM CPA20-6 and Ccirculation Pumps [pdf] Instruction Manual
CPA20-6 and Ccirculation Pumps, CPA20-6, and Ccirculation Pumps, Ccirculation Pumps, Pumps
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