EH-105
HRU
EH-105
Select
Mainten.mode
HRU
P-area
I-time
D-time
30°C
80 s
0.0 s
5 ... 100 °C
10 ... 500 s
0.0 ... 5.0 s
HRU ACTUATOR SELECTION
HRU TUNING VALUES
EH-105 HRU has PID control. Other HRU tuning is done only in
exceptional cases.
Range:
Factory setting:
HRU SETTINGS
-30 ... +30
10 ... 990Pa
10 ... 990Pa
0 ... 100Pa
10 ...500s
0 ... 100%
0 ... 100%
0 ... 100%
+3
180 Pa
120 Pa
20 Pa
240s
20%
0%
50%
Fr.Protect
Deft.Limit Pr->
AHU max
AHU min
Hysteresis
PostDefrost
DefrostOutp
IdleTimePos
Effic.Alarm
The exhaust air temperature (after the HRU), at which the HRU frost
protection function prevents the temperature from dropping below the
”Fr.Protect” setting by decreasing the heat recovery unit output.
Pressure difference limits measured above the heat recovery unit that
activate HRU defrost (frost prevention) and drive the HRU to defrost
output. During defrost the AH unit runs at minimum output (see p. 40).
The HRU defrost limits of the AC freq. converter controlled AH unit change
steplessly in proportion to the AH unit output.
Contactor controlled AH units: AH max = 1/1 output, AH min = ½ output.
The hysteresis between the start and end of HRU defrost
The defrost function remains activated for the set delay time when the
defrost command is deleted.
Heat recovery minimum output during the defrost function. The defrost
function is inhibited when the outdoor temperature is above +7°C
Control of HRU output when the AH unit is shut down (set the cube HRU
at 100% and other HRU's at 0%). Attention! Cleaning function: At the 0
setting the controller drives the HRU to maximum output and then back to
0 output if the HRU has been at 0 output for 6 hours when the AH unit is
running (service hourmeter information). The recommended value for
“cubic plate HRU” at the idle time position is 100 %.
Setting the HRU efficiency lower limit alarm. If the outdoor temperature is
not 5°C colder than the exhaust temperature and if the HRU is not at
maximum output the efficiency alarm function is not in use.
ADDITIONAL INFORMATION ABOUT SETTINGS:
HRU defrost functions according to measurement
information (Pa) from the pressure difference transmitter
above the HRU, or according to switch information from the
pressure switch.
Factory
setting:
Settings:
Range:
Explanation:
Settings Tuning values
Actuator selection
HRU
Operation mode
Settings
Tuning values
Actuator
Select the HRU operating mode and set the drive time. The drive
time is the time during which the HRU drives continuously from zero
to maximum output.
The range is 5…150s. The
character is at the selected control
mode.
36
Settings
Fr.Protect.
°C
Defr.Limit Pr->
PostDefrost
Effic.Alarm
%
+3
240
50
s
DefrostOutp
%
IdleTimePos
%
20
100
Defrost start
AHU max
Pa
AHU min
Pa
Hysteresis
Pa
180
120
20
Tuning values
P-area
°C
I-time
s
D-time
s
30
80
0.0
Actuator
0-10V/time
s
2-10V/time
s
10-0V/time
s
5
5
5
+
Instr.
p.23
