Regal-Beloit GE ECM X13 - Page 27

© 2006 GE ECM by Regal-Beloit - 25 - Indoor Blower Motors v0.2
Cooling Airflow Selection
Installation
- Typically this setting will come factory set to the highest available cooling
airflow
- This setting must be changed at the time of installation to match the cooling
tonnage of the installed condensing unit. The tonnage of the condensing unit
can be found in the installation manual for each unit and also in the model
number of the unit. Tonnage is rated as 12,000 BTU/Ton.
- For instance: ABC-036-131
o The 036 designates the BTU rating of the unit to be 36,000 BTU. The
tonnage is therefore 3 ton (36,000 BTU / 12,000 BTU/Ton = 3 ton).
- CFM is usually set at 400 CFM/Ton. Typically the charts will list the CFM per
ton in the following manner:
Example of Airflow Table
018 = 1.5 ton = 600 CFM
024 = 2 ton = 800 CFM
030 = 2.5 ton = 1000 CFM
036 = 3 ton = 1200 CFM
042 = 3.5 ton = 1400 CFM
048 = 4 ton = 1600 CFM
054 = 4.5 ton = 1800 CFM
060 = 5 ton = 2000 CFM
- The manufacturer’s instructions (charts) will show which setting to use from
up to four available cooling airflows. There is typically a different chart for
each furnace/air handler used by each OEM.
- First stage cooling airflow is typically a preset percentage of the selected
cooling airflow setting.
Benefits
- Easily select the exact cooling airflow needed at the time of installation.
- Up to four different cooling airflow settings allow the versatility of installing the
same furnace/air handler in various system configurations (i.e. 1200, 1000,
800, 600).
There is only a 1 in 4 chance that the factory “as shipped” cooling airflow is
correct for the condenser being used.
2nd Stage
CFM
1 2 3 4 5 6 7 8
A 800
0 0
B 1000
1 0
C 1200
0 1
D
1400
1 1
Dip Switch Number
Cooling Airflow Selection