Pfannenberg PWS 7102 230V Air/Water Heat Exchanger, 950 W

PWS 7102 230V air/water heat exchanger: decoded part number

The PWS 7102 230V is a compact air/water heat exchanger for control cabinets in which cooling water is available. Warm cabinet air is blown over a water-cooled coil, so the heat leaves the cabinet in the water circuit rather than in the room air, and the enclosure stays sealed.

Decoded: PWS = side-mounted air/water heat exchanger, 7102 = the 950 W model of the slim 7000 range, 230V = single-phase 230 V supply. The order number is 12051010055.

Technical specifications of the PWS 7102 230V

Values are from the product page for article 12051010055 and the series sheet. The cooling capacity is stated at 10 °C inlet water and 35 °C air.

How the PWS 7102 230V works

Inside the unit a fan circulates cabinet air through a copper-and-aluminium coil that is fed with cold water. A built-in thermostat controls a solenoid valve in the water line, so water flows only when the cabinet needs cooling, which saves water and avoids overcooling and condensation.

An integrated temperature monitor with an alarm contact reports a fault to the machine controller. The unit is described as maintenance-free, and a mounting-friendly seal means that the cut-out does not need elaborate reworking.

Because there is no refrigerant circuit, there is no compressor and no condenser fan; the cooling capacity depends on the water temperature and flow rate. The 950 W is stated at 10 °C inlet water, 35 °C air and 200 l/h.

Fit in the system and related Pfannenberg parts

The PWS 7000 range is built to be installable completely or partly in the enclosure, in either inner or outer mounting, and includes the PWS 7062 (600 W), 7102 (950 W), 7152 (1500 W), 7332 (3150 W), 7502 (5200 W) and 7702 (7000 W).

• 115 V 60 Hz version: article 12051017055
• The smaller PWS 7062 (600 W): article 12050610055 for 230 V
• Larger PWS 7152 (1500 W) and 7332 (3150 W) in the same sheet family
• Other hose connections on request

Selection and ordering checklist for the PWS 7102 230V

Before ordering the PWS 7102 230V, settle the following points so that the right variant is quoted:

• Cooling water available at the cabinet: temperature up to +35 °C, 10 bar max, flow near 200 l/h
• Heat load of the cabinet compared with 950 W at 10 °C water
• Condensate route: condensate drain
• Supply 230 V or 115 V
• Mounting inside or outside of the enclosure

Installation, commissioning and maintenance of the PWS 7102 230V

Install in the cut-out with the seal supplied by the manufacturer and connect the water through 13 mm hose nozzles. Use hoses suited to the pressure and temperature, and install shut-off valves so the unit can be taken out of service without draining the whole circuit.

Vent the water circuit before start-up and set the temperature setpoint at the integrated thermostat (factory +35 °C). Check the alarm contact wiring.

• Check the water circuit for leaks at hose clamps
• Clean the coil from dust, and check the condensate drain
• Check water quality: scale and particulates can block a small solenoid valve
• Test the alarm contact periodically

Typical applications in Oman and the GCC

Air/water heat exchangers are used where a cold-water loop exists and the cabinet air is dirty, hot or wet: chilled-water or cooling-tower circuits at power stations, desalination plants, refineries and machine halls. Because the heat leaves in the water, the cabinet stays closed to the dusty and salty air that many sites in Oman and the GCC have.

At 950 W the PWS 7102 is aimed at smaller panels or at hot spots. Remember that water quality in a seawater-cooled site matters: do not connect the unit to untreated seawater.

Variants related to the PWS 7102 230V

Models shown by the manufacturer in the PWS 7102 / 7062 sheet:

Information to send with an RFQ for the PWS 7102 230V

To quote the PWS 7102 230V quickly, please send:

• Part number PWS 7102 230V and article 12051010055
• Quantity
• Supply voltage and frequency
• Heat load, target temperature and ambient inside the room
• Cooling-water inlet temperature and flow available, and water quality
• Delivery destination and date

Site conditions in Oman for the PWS 7102 230V

Panel cooling in Oman is sized for the worst case, not the average day. Summer shade temperatures in Muscat, Sohar and the interior regularly pass 45 °C, and a cabinet standing in direct sun gains further heat through its walls. When you size the PWS 7102 230V, add the internal losses of drives, power supplies and PLCs to the solar and wall gain, and compare the total with the useful cooling capacity at your real ambient and target cabinet temperature, rather than with a nominal figure stated at milder test conditions.

Coastal sites near Duqm, Salalah or Sur also bring humidity and salt-laden dust. Keep door seals intact, route the condensate drain away from live parts, and plan routine filter and coil cleaning so that the PWS 7102 230V keeps its rated performance through the long summer season.

Documents and quotation

A product sheet for the PWS 7102 and 7062 is attached on this page, with the capacity data and article numbers.

For a quotation on the PWS 7102 230V, send the part number or article number, quantity and the delivery destination in Oman or the GCC. Seven Star LLC is an independent supplier based in Muscat and confirms availability and lead time per request.