Refco LAC Extreme User Manual download pdf

HVAC/R

Service Products

REFCO Manufacturing Ltd. Telefon +41 41 919 72 82

Industriestrasse 11 Telefax +41 41 919 72 83

CH-6285 Hitzkirch (Switzerland) [email protected] www.refco.ch

INSTALLATION OPERATION

AND MAINTENANCE GUIDE

LAC EXTREME

Cooling only, Heat pump and Low Temperature Cut-Off Models

The HPC controllers modulate the condenser fan speed to maintain a cons-

tant condensing pressure in heat pumps, air conditioners and refrigeration

plant. This results in higher efﬁciency, shorter compressor running times,

and more-stable conditions on the evaporator. Over-condensing is elimina-

ted, and freeze-up of air conditioner indoor units is prevented.

COOLING OPERATION

Controlling air movement over the condenser by varying the fan speed

maintains a constant condensing temperature, therefore a constant head

pressure. The condenser temperature is measured midway through the cir-

cuit, where the hot gas is condensing. As the condenser temperature rises

and falls, the fan speed automatically increases and slows down to maintain

the head pressure at the set point level. When ﬁrst powered in the fan runs

at full speed for 10 seconds before controlling to temperature. Note: low

temperature cut-off models need to measure within range before start up.

As temperatures drop the fan speed will fall to its minimum speed. Low

temperatures cut-off models switch off the fan if the temperature continues

to drop: a temperature rise will initiate a 2 second full speed re-start to get

the fan moving. Dual circuit systems are accommodated by the 2-sensor

model where controller responds to the higher of the two temperatures.

Fig. 1 Application Example

1 2 3 4 5 6 ... 11 12

Summary of Contents

Page 1 - LAC EXTREME

HVAC/RService ProductsREFCO Manufacturing Ltd. Telefon +41 41 919 72 82Industriestrasse 11 Telefax +41 41 919 72 83CH-6285 Hitzkirch (Switzerland)

Page 2 - WIRING THE CONTROLLER

HVAC/RService ProductsREFCO Manufacturing Ltd. Telefon +41 41 919 72 82Industriestrasse 11 Telefax +41 41 919 72 83CH-6285 Hitzkirch (Switzerland)

Page 3 - Setting Up

HVAC/RService ProductsREFCO Manufacturing Ltd. Telefon +41 41 919 72 82Industriestrasse 11 Telefax +41 41 919 72 83CH-6285 Hitzkirch (Switzerland)

Page 4 - WARTUNGSANLEITUNG

HVAC/RService ProductsREFCO Manufacturing Ltd. Telefon +41 41 919 72 82Industriestrasse 11 Telefax +41 41 919 72 83CH-6285 Hitzkirch (Switzerland)

Page 5 - VERKABELUNG DER STEUERUNG

HVAC/RService ProductsREFCO Manufacturing Ltd. Telefon +41 41 919 72 82Industriestrasse 11 Telefax +41 41 919 72 83CH-6285 Hitzkirch (Switzerland)

Page 6 - Einrichtung

HVAC/RService ProductsREFCO Manufacturing Ltd. Telefon +41 41 919 72 82Industriestrasse 11 Telefax +41 41 919 72 83CH-6285 Hitzkirch (Switzerland)

Page 7 - ET D’ENTRETIEN

HVAC/RService ProductsREFCO Manufacturing Ltd. Telefon +41 41 919 72 82Industriestrasse 11 Telefax +41 41 919 72 83CH-6285 Hitzkirch (Switzerland)

Page 8 - CÂBLAGE DU CONTRÔLEUR

HVAC/RService ProductsREFCO Manufacturing Ltd. Telefon +41 41 919 72 82Industriestrasse 11 Telefax +41 41 919 72 83CH-6285 Hitzkirch (Switzerland)

Page 9 - Conﬁguration

HVAC/RService ProductsREFCO Manufacturing Ltd. Telefon +41 41 919 72 82Industriestrasse 11 Telefax +41 41 919 72 83CH-6285 Hitzkirch (Switzerland)

Page 10 - DI MANUTENZIONE

HVAC/RService ProductsREFCO Manufacturing Ltd. Telefon +41 41 919 72 82Industriestrasse 11 Telefax +41 41 919 72 83CH-6285 Hitzkirch (Switzerland)

Page 11 - CABALAGGIO DEL CONTROLLER

HVAC/RService ProductsREFCO Manufacturing Ltd. Telefon +41 41 919 72 82Industriestrasse 11 Telefax +41 41 919 72 83CH-6285 Hitzkirch (Switzerland)

Page 12 - Impostazioni

HVAC/RService ProductsREFCO Manufacturing Ltd. Telefon +41 41 919 72 82Industriestrasse 11 Telefax +41 41 919 72 83CH-6285 Hitzkirch (Switzerland)

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