AEC NEC Central Station Air and Water Cooled Chiller - Manual (Page 26)

NEC Series Water- and Air-Cooled Central Chillers Page 25
3-7 NECR Remote Condenser Installation
Figure 10
NECR models use the surrounding air to cool the condenser. All models have variable speed
fans and low ambient controls to allow proper operation down to -20°F outdoor air temperature.
Install the remote air cooled condenser where:
• Air temperature is greater than or equal to -20°F.
• Air has free passage for condensing.
• Structural support is adequate.
• The unit is protected from strong winds and drifting snow.
• Provisions exist for removal of heated air from the area.
• No steam, hot air or fume exhausts can be drawn into the condenser coils.
• Service personnel can have easy access to all components of the unit.
Notes:
• NECR condensing pressure with 85°F (29ºC) condenser air, using R-22: • 260
psi.
• Due to the variables involved in remote air-cooled condenser installations, no set
or standard piping procedure exists. Each installation must be designed and
installed by qualified persons. Follow the instructions supplied with the condenser.
2-8 Motor Direction Check
Compressors
Compressors operate properly in either direction.
Condenser Fan
On NECR units, air should be drawn through the condenser and discharged up from the
condenser.
Changing Fan Rotation Direction
• Disconnect and lock out power at the fused disconnect.
• If all fans are going backwards, reverse any two main power leads.
• If only some of the fans are going backwards, switch any two of their respective motor
leads.