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CLEANING & MAINTENANCE
CAUTION
DO NOT WASH THE ENERGY EXCHANGE CORE.
The energy exchange core can be replaced but is expensive.
OPERATION
RA: Return Air OA: Outside Air EA: Exhaust Air FA: Fresh Air SA: Supply Air (furnace)
FEATURES
1.OA knob: Low airflow knob for OA, from 40CFM-100CFM, factory set at 100CFM;
2.RA knob: Low airflow knob for RA, from 40CFM-100CFM, factory set at 100CFM;
3.T knob: Timer knob for run time per hour (minutes / hour), stepless adjustable from 5 to 60 minutes, factory set at 60 minutes.
4.RH knob: Relative humidity limit knob from 30% - 80%. Factory set at 80%.
5.Filter reset button。
6.L1: Red indicator light.
7.L2: Orange indicator light.
OPERATING INSTRUCTIONS
a. Inspect your installation to be sure all duct work is correctly installed and sealed
and filters are in place.
b. Shut and latch the door to the unit.
Plug the unit in to a 120V power outlet. It will start immediately and run a two
minute system check.The L1 and L2 indicator lights will illuminate continuously.
After two minute, L1 and L2 turn off, and the unit runs per the user settings.
c. The unit runs at low speed (40-100CFM) set by the OA/RA low airflow knobs for a period of time (5-60 minutes/hour) set by the timer knob.The
manual override switch (MOS) boosts the unit to high speed.The unit returns to low speed operation after the MOS is turned off.
d. HUMIDITY SENSOR OPERATION
When the outdoor relative humidity exceeds the user-set limit (30-80% RH), the unit will stop running and enter a check cycle. The orange L2 led
indicator light will illuminate continuously. The check cycle will run the unit for 5 minutes at full speed every 15 minutes(25% of every hour) in order to
sample the outside air conditions and meet code requirements.
NOTES:
The HVAC/AHU blower (if connected) will NOT run during this check cycle to prevent cycling. The MOS will still boost the unit to high speed during the
check cycle and will activate the HVAC/AHU blower if connected.
e.TEMPERATURE SENSOR OPERATION
When the MOS switch is on and the outdoor temperature t(° C) reaches the following range,the air exchange time (OA and RA fans run at a high
speed),circulation time (RA fan stops,OA fan runs at a high speed) and stop time of the unit within 60 minutes (a cycle of 60 minutes) are referred to the
following table:
t
(℃)
t>-10
-15<t≤-10
-20<t≤-15
-27<t≤-20
-30<t≤-27
t<-30
When the MOS switch is off and the outdoor temperature t(° C) reaches the following range,the air exchange time (OA and RA fans run at the set
speed),circulation time (RA fan stops,OA fan runs at a high speed) and stop time of the unit within 60 minutes (a cycle of 60 minutes) are referred to the
following table:
First air exchange
t(℃)
time Ta1（min）
t>-10
-15<t≤-10
1.T≤35, Ta1=T
-20<t≤-15
2.T>35, Ta1=35
1.T≤27, Ta1=T
-27<t≤-20
2.T>27, Ta1=27
1.T≤20, Ta1=T
-30<t≤-27
2.T>20, Ta1=20
t≤-30
Air exchange time（min）
60
60
35
27
20
4
First circulation
time Tb1（min）
T
0
T
9
9
9
9
9
4
Circulation time（min）
0
9
9
9
9
9
Second air exchange
Second circulation
time Ta2（min）
time Tb2（min）
/
/
1.T≤44, Ta2=0
1.T≤44, Tb2=0
2.44<T≤50,Ta2=T-35-9
2.T>44, Tb2=9
3.T≥51, Ta2=35
1.T≤36, Ta2=0
1.T≤36, Tb2=0
2.36<T≤50,Ta2=T-27-9
2.T>36, Tb2=9
3.T≥51, Ta2=27
1.T≤29, Ta2=0
1.T≤29, Tb2=0
2.29<T≤50,Ta2=T-20-9
2.T>29, Tb2=9
3.T≥51, Ta2=20
/
2
RA knob
Stop time（min）
0
0
0
0
0
47
Stop time Tc
（min）
/
60-T
1.T≤50,Tc=60-T-9
/
2 T≥51, Tc=0
1.T≤35,Tc=60-T-9
2.35<T≤44,Tc=16；
3.44<T≤50,Tc=51-T；
4.T≥51,Tc=0
1.T≤27,Tc=60-T-9
2.27<T≤36,Tc=24
3.36<T≤50,Tc=51-T；
4.T≥51,Tc=0
1.T≤20, Tc=60-T-9
2.20<T≤29,Tc=31；
3.29<T≤50,Tc=51-T；
4.T≥51,Tc=0
/
47
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OA knob
L1
L2
Filter reset button
T knob
RH knob
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