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Operating instructions (cont.)
Economizer
Economizer is used to reduce the energy consumed by the cooling systems, by using low external air temperatures to assist in the
chilling process. When outdoor temperatures are lower relative to indoor (room) temperatures, the system utilizes the cool outdoor air
as a free cooling source.
The outdoor temperature (Teconomizer) triggering the activation of the economizer, can be measured by the temperature sensor
connected to T1,0 terminals (technician parameter P08="05") or by setting a temperature value manually through communication -
AV#129 "TEconomizerEffective".
When getting the temperature through communication, terminals T1,0 can be used for any other functionality like External sensor/Soft
start in heat sensor/Deicing in cool/Door switch/Key tag.
Whenever there is demand for cooling and the outdoor temperature conditions allow the operation of the economizer, it will operate
together with the regular cooling system and will not replace it.
Economizer will start when both of the following conditions are satisfied:
1.
Teconomizer temperature < Room temperature -
2.
Room Temperature > Setpoint temperature
Economizer will stop when the following condition is satisfied:
1.
Room Temperature < Setpoint temperature -
Economizer
ON
Teconomizer
OFF
Room Temp.
Indication for the Economizer operation:
When Economizer is active, the "Cool" symbol will appear (or flash when active)
on display and the "Fan" symbol will flash.
Cool differential band
Cool differential band
2
Room Temp.
Setpoint
Cool differential band
- 12 -
2
Temperature
Economizer
active
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