Sullair 3000 EES, User Manual

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SECTION 2 EES USER MANUAL
15
OR
• The temperature of the incoming outside
air is higher than the set value of the out-
side air temperature controller. Refer to
Figure 2-5 .
Operation of the rejected and recovered air dampers
is accomplished with use of two position actuator
motors. Only one damper should ever be open at a
given time. When heat is being recovered, the
recovered damper opens while the rejected damper
closes. Conversely when heat is being rejected, the
rejected damper opens while the recovered damper
closes. Both actuators are spring return so when the
compressor does not have power or is on standby,
the actuators return to their normally closed
positions.
2.8 FUNCTIONAL DESCRIPTION
—POWER PRESENT RELAY
A power present relay ( Figure 2-2 ) is used to prevent
unnecessary operation of the EES components. The
EES system will only operate when the compressor
is running. When power is not provided to the
compressor or when the compressor is in standby
mode and not running, there is no power to the EES
controls or motor actuators. Refer to
Figure 2-6 .
Upon compressor startup, a signal is sent from the
WS controller to the power present relay located in
the EES electrical enclosure. Power is then provided
to the controls and the EES will function normally.
Bypass Air
Damper
To Outside
Incoming Air
Damper
Outside Air
Temperature Sensor
Cooler
Mixed Air
Temperature Sensor
Recovered Air
Damper
Rejected
Air Damper
Figure 2-5: High Outside Temperature
WARNING
When the compressor is on standby there
is still power to the primary and secondary
leads on the transformer in the EES electri-
cal enclosure.
Bypass Air
Damper
Incoming Air
Damper
Outside Air
Temperature Sensor
Cooler
Mixed Air
Temperature Sensor
Recovered Air
Damper
Rejected
Air Damper
Figure 2-6: No Power or Standby