12 CVS-21HA.rev.03
To select the operating mode:
Set switch # 6 to the required position:
Stage 3 used for heating:
set switch # 6 to ON.
Stage 3 used for cooling:
set switch # 6 to OFF.
FACTORY SETTING: When the controller is shipped from the factory,
switch # 6 is set to OFF (stage 3 used for cooling).
SELECTING MOTOR CURVES FOR THE
VARIABLE SPEED STAGES
The relationship between the voltage supplied to a variable speed motor
and the speed it develops is described by a motor curve. This curve
varies with the make and capacity of the motor. The variable speed
motors available in the industry have been grouped into ten categories
and the controller is programmed with a different motor curve for each of
these categories. Selecting an appropriate curve for each of the variable
speed stages will ensure that the controller supplies the correct voltage to
the fan motors.
To select a motor curve for stage 1:
In the list of motors enclosed with this user's guide, locate the make
and capacity of the motors you are using and note the corresponding
curve number.
Set the parameter selection knob to BANDWIDTH/M.C.-STAGE 1.
The stage 1 band width appears flashing on the display.
Press the push-button. The currently selected curve number
appears flashing on the display.
Turn the adjustment knob to adjust the curve number to the desired
value.
6
ON
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