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Siemens Standard application AHU CE1P3977en_02
Building Technologies Functions 01.02.2010
Heat recovery is forced off if:
– Night unoccupied (temperaturstart) cool
– Summer night cooling
– Firemode with running fan
• Pump can also be used as a command for wheel.
• Frost sensor with wheel or plate activate an exhaust sensor. Frost sensor with
water activate a water sensor. The exhaust sensor can also be used for
efficiency.
Master Index > Unit > Temperature Control > Heat recovery
Parameter Range Function
Controller 0…100 [%] Present value for the heat exchanger controller. Go
to controller settings page.
Output signal 0…100 [%] Present value for analog output. Go to page with all
analog output settings.
Pump / cmd – Off
– On
Current pump status. Go to heat recovery pump
page.
Alarm – Ok
– Alarm
Alarm state for heat recovery. Go to page with digi-
tal input settings. For example, you can set the time
for jitter protection (Default: 0 s).
Frost monitor – Ok
– Frost.
Present state of frost detector. Go to page with digi-
tal input settings.
The output limited for DeFrost MaxSpeed for “Frost”
state. The plant is shut down after 20 minutes and
an alarm is triggered.
Frost protection – 0…100% Present value for the frost controller. Go to Hrec
frost protect page to parameterize frost control.
Frost protect press --- Go to pressure frost page to parameterize frost con-
trol.
Efficiency 0…100% Present value of heat recovery efficiency. Go to
page with settings for heat recovery efficiency.
Start up time 0…600 [s] Time for controller start behavior.
Start up tmp –64.0…64.0 [°C] Temperature limit for start behavior.
Max speed defrost 0…100% Maximum allowable output value for frost detection.
The startup time for the output is set to 100% if the outside air temperature < Start
up tmp. Afterwards, the controller determines the present position.
If heat demand exists at startup, the heating register is started in parallel, and after
successful startup, the controller for heat recovery deploys to the maximum allow-
able position (100%).
Cooling recovery starts, when the following conditions are met:
– Outside air temperature > room temperature + 2K
and
– Room temperature > room setpoint + 1K
Cooling recovery stops for the following cases:
– Outside air temperature <= Room temperature
or
– Room temperature >= room setpoint.
For pure supply air control, the room setpoint test is disabled and then only the
outside air temperature-room temperature condition is considered.
Note
Parameter
Startup behavior
Funktion Cooling
recovery
Basis Document Siemens Climatix Control System
BDCX.100820.01GB
Page 70
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