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AB Industrietechnik srl – Via Julius Durst, 70 – 39042 BRESSANONE (BZ) Italy – Tel: +39 0472/830626 – [email protected] – www.industrietechnik.it
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Cross-flow heat exchanger:
The cross-flow heat exchanger does not need an output.
It is equipped with a bypass damper (on/off or modulating) that is used to stop the passage of air through the heat exchanger
channels based on following schedule indications (column Activation). When bypass is not activated, cross-flow heat ex
-
changer is always in recovery.
Bypass type of heat exchanger
Activation and parameters setting and operating
On/off
Activation:
- during cooling and/or heating request when conditions of
free cooling and/or free heating are present.
- during exchanger frost protection alarm if
186
=1 or 3 (*)
Parameter setting and operating:
010
= 2 (bypass on/off).
011
= 1 (damper regulated on free cooling/heating)
012
= 1 (cross-flow heat exchanger).
Select output for bypass damper
025
=13 (DO1) or
026
=13
(DO2) or
027
=13 (DO3) or
028
=13 (DO4) or
029
=13 (DO5)
Activate free cooling and/or heating with parameter
170
.
Set an analogue output as external sensor
019
=3 (AI1) or
021
=3 (AI2) or
023
=3 (AI3)
Set parameters of free cooling and/or heating from
171
to
178
(see
“35. Configuration of installer parameters (level 2
password)” page 120
)
For operating mode of Bypass damper see paragraph
“21.
Regulation with free cooling, free heating” page 53
On/off (based on free cooling/heating only)
Activation:
- during conditions of free cooling and/or heating
without
considering
cooling and/or heating request.
- during exchanger frost protection alarm if
186
=1 or 3 (*)
Parameter setting and operating:
010
= 5 (bypass on/off based on free cooling/heating only).
011
= 1 (damper regulated on free cooling/heating)
012
= 1 (cross-flow heat exchanger).
Select output for bypass damper
025
=20 (DO1) or
026
=20
(DO2) or
027
=20 (DO3) or
028
=20 (DO4) or
029
=20 (DO5)
Activate free cooling and/or heating with parameter
170
.
Set an analogue output as external sensor
019
=3 (AI1) or
021
=3 (AI2) or
023
=3 (AI3)
Set parameters of free cooling and/or heating from
171
to
178
(see
“35. Configuration of installer parameters (level 2
password)” page 120
)
For operating of bypass see paragraph
“Operation with on/
off bypass damper for cross-flow heat exchanger” page 53
Modulating
Activation:
- during cooling and/or heating request when conditions of
free cooling and/or free heating are present, the damper is
modulated.
- during exchanger frost protection alarm if
186
=1 or 3 (*)
Parameter setting and operating:
010
= 4 (modulating bypass)
011
= 1 (damper regulated on free cooling/heating)
012
= 1 (cross-flow heat exchanger).
Select output for damper
030
=13 (AO1) or
031
=13 (AO2) or
032
=13 (AO3).
Activate free cooling and/or heating with parameter
170
.
Set an analogue output as external sensor
019
=3 (AI1) or
021
=3 (AI2) or
023
=3 (AI3)
Set parameters of free cooling and/or heating from
171
to
178
(see
“35. Configuration of installer parameters (level 2
password)” page 120
)
For operating mode of Bypass damper see paragraph
“21.
Regulation with free cooling, free heating” page 53
(*) return air (warm) can defrost fins of heat exchanger as they are not mixed with fresh air.
