York Millennium YCAJ150, Installation Operation & Maintenance, Page: 79 / 116

FORM 150.65-NM4
79 YORK INTERNATIONAL
SYS. 1 SYS. 2 AMBIENT AMBIENT
FANS FANS ON OFF
2 & 4 6 & 8 25°F (-3.9°C) 24°F (-4.4°C)
1 & 3 5 & 7 45°F (7.2°C) 40°F (4.4°C)
FIG. 27 – FAN LOCATIONS
LD02668
FAN CONTROL STRATEGY
ABOVE 25°F (-3.9°C) AMBIENT
The chiller is equipped with 8 condenser fans; 4 per sys-
tem. The standard fan control strategy is fan cycling by
outdoor ambient temperature, with the low ambient cut-
out (chiller shut down) set at 25°F (-3.9°C).
Above 25°F (-3.9°C) ambient, 2 fans on a respective sys-
tem will turn on 4 seconds after the compressor starts.
These fans will continue to run until the compressor shuts
down. These fans are designated as Fans 2 & 4 on SYS
1 and Fans 6 & 8 on SYS 2.
If the ambient temperature is above 45°F (7.2°C), 2 or
more fans on a respective system will start after the com-
pressor has run for 30 seconds. These two fans will con-
tinue to run until the compressor shuts down or until the
ambient temperature drops to 40°F (4.4°C). These fans
are designated as Fans 1 & 3 on SYS 1 and Fans 5 & 7
on SYS 2.
Locations of the fans and a chart showing the operation
outlined above is shown in Fig. 27.
For operation below 25°F (-3.9°C), a Low Ambient Kit
MUST be installed. See page 89.