JOHNSON CONTROLS
161
SECTION 8 – UNIT OPERATION
FORM 150.72-ICOM7
ISSUE DATE: 10/22/2020
8
VSD FAN
VSD fans are equipped and controlled to extend the
minimum starting ambient temperature to -10°F
(-23.3°C).
The number of compressors running in the system, the
programmed fan speed references, and the fan ramp
speed determine the speed of the VSD.
For the YLAA fan speed control, there are the follow-
ing options:
• SINGLE SPEED or STANDARD fans
• YLAA TWO SPEED FANS
• YLAA VSD FANS
To enable fan inverter control, set the fan speed control
in SERVICE MODE to YLAA VSD FANS.
FIGURE 36 - CONDENSER FAN LOCATIONS
YLAA0221HE, YLAA0241SE,
YLAA0261HE, YLAA0262HE,
YLAA0286SE, YLAA0320SE
YLAA0350HE, YLAA0392HE,
YLAA0435SE, YLAA0485SE
YLAA0301HE, YLAA0360SE,
YLAA0400SE
YLAA0391HE
YLAA0442HE YLAA0457HE, YLAA0517HE
YLAA0180SE, YLAA0195HE,
YLAA0210SE
LD17081b
CHANGING THE SWITCH POINT OF THE
THERMAL DISPERSION FLOW SWITCH
To change the factory-set LED 7, complete the follow-
ing steps:
1. Press the ◄ or ► push button. The switch point
LED ashes.
2. Press the ◄ or ► push button as many times as re-
quired in less than 2 seconds between each press.
Each press of the push button shifts the LED by
one position in the indicated direction.
3. Stop pressing the button when the switch posi-
tion LED changes to the required position. The
ow switch automatically returns to the operating
mode with the new setting in 2 seconds.
4. To prevent unintentional settings, press both push
buttons simutaneously for at least 10 seconds in
operating mode to lock the switch electronically.
To unlock the ow switch, perform the same oper-
ation again. The setting remains the same in case
of power failure.
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