19
AIR BALANCING
A variable pulley is fitted to the motor shaft in order adjust to the blower performance to the pressure drop at the
duct work. The pulley must be adjusted when the measured external static pressure and air volume (motor current
draw) differ from the nominal values at the unit.
CASE N°1:
There is less pressure drop in the ductwork than planned, i.e. motor current draw is higher than nominal and the
external pressure is lower than nominal. The slower speed must be reduced to lower the treated airflow and re-
establish the air balance point. It is imperative to adjust the pulley, otherwise the motor’s internal protection will
trigger because of overheating taking the entire unit out of operation.
CASE N°2:
In the opposite case, i.e. the motor current draw is lower and the external pressure measured is higher, this means
that the ductwork pressure drop is too high.
Enlarge the diameter the motor pulley. This will increase the speed of the blower and the air volume. The replacement
with a larger motor may be necessary.
It should be noted that for the RT40-50 range, the maximum usable motor size is 3kW. A choice of factory-fitted
motor/blower assemblies are available for higher. Accordingly, preliminary pressure drop calculations of the installed
ductwork are vital for selecting the right equipment.
RT 40 - RT 50
BLOWER MOTOR < 3kW
RT 40 - RT110
BLOWER MOTOR > 3kW
Содержание Rooft@ir 100
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Страница 29: ...APPENDIX ANNEXE ANLAGE ALLEGATO ANEXO APPENDIX ANNEXE ANLAGE ALLEGATO ANEXO ...
Страница 33: ...APPENDIX ANNEXE ANLAGE ALLEGATO ANEXO V RT100 RT110 2308 3400 3326 1777 1813 3328 2200 900 651 50 170 ...
Страница 34: ...APPENDIX ANNEXE ANLAGE ALLEGATO ANEXO VI 532 A B EXHAUST BLOWER 40 50 60 70 80 100 110 A 642 690 B 828 910 ...
Страница 37: ...APPENDIX ANNEXE ANLAGE ALLEGATO ANEXO IX AIR FLOW AIR RETURN 445 178 50 D A C 130 50 397 B 260 RT40 RT50 ...
Страница 50: ...APPENDIX ANNEXE ANLAGE ALLEGATO ANEXO XXII RT40 RT50 CONTROL pCO1 1 3 1 4 1 3 1 4 ...
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Страница 53: ...APPENDIX ANNEXE ANLAGE ALLEGATO ANEXO XXV RT60 RT70 RT80 CONTROL pCO1 ...
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