Cooper & Hunter CH-HRV2.5KDC User manual

ENERGY RECOVERY
VENTILATION SYSTEM
Attention
For proper operation, please read and keep this man al caref lly
Designed by Cooper&H nter International Corporation, Oregon, USA
USER’S MANUAL
MODELS:
CH-HRV1.5KDC
CH-HRV2.5KDC
CH-HRV3.5KDC
CH-HRV5KDC
CH-HRV6.5KDC
CH-HRV8KDC
CH-HRV10KDC
CH-HRV15KDC
CH-HRV20KDC
www.cooperandh nter.com

Safety Considerations------------------------------------------------------------3,4
Unit Specifications--------------------------------------------------------------- 5,6
Dimensioned Drawings----------------------------------------------------------7,8
Installation Considerations--------------------------------------------------9,10,11
Electrical Installation--------------------------------------------------------------12
Wiring Diagrams---------------------------------------------------------------13,14
Commissioning Information------------------------------------------------------15
Intelligent Controller-------------------------------------------------------16 to 19
Dia Switch ------------------------------------------------------------------------20
Modb s Table --------------------------------------------------------------------21
Maintenance ----------------------------------------------------------------------22
Fan curves -----------------------------------------------------------------------23
Contents

Please read the following safety instr ctions before installation. And ens re that the nit is installed
correctly.
Please observe all instr ction in order to avoid any inj ry or damage to eq ipment or property.
Safety attentions
The following symbols indicate potential levels of ca tion.
Sit ations with a risk or death or
serio s inj re.
Sit ations with a risk of inj ry or
eq ipment/property damage.
The following symbols indicate compliance which m st be observed
Not allowed or Stop M st follow or obliged
Installation to be carried o t by q alified
person, End Users m st not install, move or
re-install this eq ipment by themselves
An anti-bird net or similar device sho ld be
installed to o tside vents. Ens re there are
no obstr ctions to or in the d cts
Installation engineers m st follow this man-
al strictly. Improper action can create a
health hazard and red ce efficiency of the
nit
Fresh air vent m st be far eno gh away
from any fl e gas discharge or areas where
hazardo s vapors are present
Unit m st be installed strictly following this
man al and mo nted to a weight bearing
s rface for the weight of the nit
Electric engineering m st follow national
reg lations and the man al, se special ca-
bles. Less capacity cables and improper en-
gineering can ca se electric shock or fire.
D ring maintenance or repair, the nit and
circ it breaker m st be switched off. Other-
wise electric shock co ld occ r.
Gro nd wire cannot be connected to gas
pipe, water pipe, lighting rod or telephone
line etc. Incorrect gro nding can ca se
electric shock.
Power cable and wires m st be installed by
a q alified electrical engineer. Improper
connection can ca se over heating. Fire and
loss of efficiency.
To avoid condensation, ins lation sho ld be
fitted to fresh air d cts. Other d cting may
also req ire ins lation depending on dew
point conditions.
Ins lation between the metal d cting and
wall penetration m st be installed if the
d cting penetrates metal wall cladding, to
avoid risk of electric shock or c rrent leak-
age.
The cover of wiring box m st be pressed
down and closed to avoid d st and dirt en-
tering. Excess d st and dirt can ca se over-
heating of terminals and res lt in fire or
electric shock.
Use only approved installation hardware
and accessories. Fail re to observe can re-
s lt in fire risk, electric shock and eq ip-
ment fail re
Where the nit is positioned, at high level in
a hot h mid sit ation. Please ens re s ffi-
cient ventilation is available
The o tdoor d cts m st be installed facing
downwards to avoid rain water entering.
Improper installation can ca se water leak-
age.
Correctly sized MCB m st be fitted to the
nit s itable earth leakage protection
sho ld also be installed to avoid risk of elec-
tric shock or fire.
3
Safety Considerations

Safety Considerations
Do not install the nit in an extremely h -
mid conditions, as it may res lt in electric
shock and pose a fire risk.
Do not se the nits as the primary kitchen
extract grease and fatty deposits can block
the heat exchanger, filter and pose a fire
risk.
Don not install the nit in areas there any
poisono s or ca stic gases are present.
Do not install the nit near open flame as it
may res lt in over heating and pose a fire
risk
Acidic or alkali environments can ca se
poisoning or a fire
Rated s pply voltage m st be maintained,
otherwise this may ca se fire.
4
Safety Considerations

5
Specifications
Model
CH-HRV1.5KDC CH-HRV2.5KDC CH-HRV3.5KDC CH-HRV5KDC
Performance
Airflow (m
3
/h) 150 250 350 500
Airflow (l/s) 43 71 100 143
Enth. Eff (%) Heating 70 70 69 67
Cooling 63 63 66 62
Temp. Eff (%) 75 75 75 75
Noise Db(A) 23 24 28 30
Power S pply 220V/1Ph/50Hz
Inp t Power (W) 51 81 112 143
Power Cable 2x1.5mm
2
Control Cable 2x0.5mm
2
Control
Standard Yes (7-Day Time-clock)
(BMS)
Modb s Yes
Fan Type DC Fan Motors
Fan Speeds (S pply) 10 Speed Fan Control
Fan Speeds (Exha st) 10 Speed Fan Control
S mmer Bypass Yes (A tomatic with adj stable range)
Defrost Yes (A tomatic with adj stable range)
CO
2
Control Optional controller available (On / Off control with adj stable range)
Fan Boost Contacts Yes (3x available connections to Contacts: Closed = Boost to High Speed)
Fire Sh tdown Yes (1x available connection to Contact: Closed = Sh tdown)
Weight (Kg) 25 29 37 43
Size (WxHxD) 580x264x808 599x264x882 804x270x882 904x270x962
D ct Size 150 150 150 200

6
Specifications
Model
CH-HRV6.5KDC CH-HRV8KDC CH-HRV10KDC CH-HRV15KDC CH-HRV20KDC
Performance
Airflow(m
3
/h) 650 800 1000 1500 2000
Airflow (l/s) 186 229 286 429 571
Enth. Eff (%) Heating 68 71 71 71 71
Cooling 62 65 65 65 65
Temp. Eff (%) 75 75 75 75 75
Noise Db(A) 32 35 35 38 38
Power S pply 220V/1Ph/50Hz
Inp t Power (W) 205 290 305 580 610
Power Cable 2x1.5mm
2
Control Cable 2x0.5mm
2
Control
Standard Yes (7-Day Time-clock)
(BMS)
Modb s Yes No
Fan Type DC Fan Motors
Fan Speeds (S pply) 10 Speed Fan Control
Fan Speeds (Exha st) 10 Speed Fan Control
S mmer Bypass Yes (A tomatic with adj stable range)
Defrost Yes (A tomatic with adj stable range)
CO
2
Control Optional controller available (On / Off control with adj stable range)
Fan Boost Contacts Yes (3x available connections to Contacts: Closed = Boost to High Speed)
Fire Sh tdown Yes (1x available connection to Contact: Closed = Sh tdown)
Weight (Kg) 64 71 83 165 189
Size (WxHxD) 884x340x1222 884x388x1322 1134x388x1322 884x785x1322 1134x785x1322
D ct Size 200 250 250 300 300

CH-HRV1.5KDC to HRV5KDC Models
CH-HRV6.5KDC to HRV10KDC Models
7
Dimensioned Drawings

CH-HRV15KDC to HRV20KDC Models
Diagram Meas rements
The table on right side shows s itable d ct meas rements for each nit.
The table below shows the dimensions of the image above and the two images previo sly, the letter in
the table represents the letter on the diagram .
Model Dia.
(mm)
CH-HRV1.5KDC
Φ150
CH-HRV2.5KDC
Φ150
CH-HRV3.5KDC
Φ150
CH-HRV5KDC
Φ200
CH-HRV6.5KDC
Φ200
CH-HRV8KDC
Φ250
CH-HRV10KDC
Φ250
CH-HRV15KDC
280*650
CH-HRV20KDC
280*650
Model L L1 W W1 W2 H H1 C G N
CH-HRV1.5KDC
808 867 580 510 290 264 20 100 19 Φ144
CH-HRV2.5KDC
882 810 599 657 315 270 111 100 19 Φ144
CH-HRV3.5KDC
882 810 804 860 480 270 111 100 19 Φ144
CH-HRV5KDC
962 890 904 960 500 270 111 107 19 Φ194
CH-HRV6.5KDC
1222 1150 884 940 480 340 146 107 19 Φ194
CH-HRV8KDC
1322 1250 884 940 428 388 170 85 19 Φ242
CH-HRV10KDC
1322 1250 1134 1190 678 388 170 85 19 Φ242
CH-HRV15KDC
1322 1250 884 940 428 785 170 150 19 280*650
CH-HRV20KDC
1322 1250 1134 1190 678 785 170 150 19 280*650
8
Dimensioned Drawings

CH-HRV6.5KDC to HRV20KDC
检查口
新风出口
污风入口
污风出口 新风入口
RA SA
OA EA
SERVICE PORT
CH-HRV2.5KDC to HRV5KDC
CH-HRV1.5KDC
EA
RA
OA
SERVICE PORT
SA
EA
RA
OA
SERVICE PORT
SA
Installation Considerations
Protect the nit to avoid d st or other obstr ctions entering the nit and accessories d ring installation,
or whilst in storage on site. Service ports sho ld be installed to allow access for filter maintenance.
1. Be s re the ceiling height is no less than the Fig res in above table B col mn.
2. Unit m st not be installed close to boiler fl es.
3. Following phenomenon sho ld be avoided in the d cting installation.
Serve bends M ltiple red cers/ crimped d ct
M ltiple direction changes
Dimensions Celling Height
Model A B
CH-HRV1.5KDC
580 320
CH-HRV2.5KDC
599 320
CH-HRV3.5KDC
804 320
CH-HRV5KDC
904 320
CH-HRV6.5KDC
884 390
CH-HRV8KDC
884 440
CH-HRV10KDC
1134 440
CH-HRV15KDC
884 835
CH-HRV20KDC
1134 835
9
Installation Considerations

4.Exessive se of flex-d ct and long flex-d ct r ns sho ld be avoided.
5.Fire dampers m st be fitted as per national and local fire reg lations.
6.Unit m st not be exposed to ambient temperat re above 40℃ and sho ld not face an open fire.
7.Take action to avoid dew and frost.
As shown by drawing below, nit will prod ce dew or frost when sat ration c rve is formed from A to C.
Use pre-heater to ens re conditions are kept to right of the c rve (B to B＇,to move C to C) to prevent
condensation or frost formation.
8. To avoid the o tdoor exha st air cycling back to indoor, the distance between the two vents installed
on the o tside wall sho ld be over 1000mm.
9.If heater is eq ipped to the nit, operation of heater sho ld be synchrono s with the nit, so that the
heater starts to work only when nit starts.
10.D ct m ffler may be considered if ser wants indoor noise to be minimized.
10
Installation Considerations

Installation Diagram
Fresh Air In
Exhaust Air Out
Outside Fresh Air Duct
Insulation Discharge Duct
Suspending Pole
Fresh Air Duct
Exhaust Duct
Return Air Supply Air
Return Air
Supply Air
Physical Installation
1.Installer to prepare s itable threaded hangers with adj stable n ts and gaskets.
2.Install as shown by the image above. Installation m st be level and sec rely fastened.
3.Fail re to observe proper fixing co ld res lt in inj ry, eq ipment damage and excessive vibration.
Uneven installation will also effect damper operation.
Notes for reverse installation of the nit
4.Reverse labeling shows the nit is pside down.
D cting
1. Connection of nit vents and d cts sho ld be taped or sealed to prevent air leakage, and sho ld com-
ply to relevant g idelines and reg lations.
2. The two o tdoor vents sho ld face downward toward the o tside to prevent any rain water ingress.
(angle 1/100 1/50).
3. Ins lation m st be with the two d cts o tside to prevent condensation.
Material: glass cotton, Thickness: 25mm
11
Installation Considerations
天花板吊装螺杆
(Φ10-Φ12)
螺母
垫圈
吊装部件
垫圈
螺母
S spending screw pole
N t
Gasket
S spending Part
Gasket
N t
坡度1/100-1/50
Gradient1/100-1/50

Power m st be isolated d ring installation and before maintenance to avoid inj ry by electric shock. The
specifications of cables m st strictly match the req irements, otherwise it may ca se performance fail-
re and danger of electric shock or fire.
Power s pply is AC220V/50HZ/1 Phase. Open the cover of electrical box, connect the 2 wires (L/N/) to
the terminals and connect the cable of the control panel to the board according to the wiring diagram,
and join the control panel to the cable.
Model Spec. of power s pply
cable
Spec. of normal controller
cable
CH-HRV1.5KDC
2×1.5mm
2
CH-HRV2.5KDC
CH-HRV3.5KDC
CH-HRV5KDC
CH-HRV8KDC
CH-HRV10KDC
CH-HRV15KDC and CH-HRV20KDC
2×0.5mm
2
CH-HRV6.5KDC
We do not accept any liability for any problems ca sed by the ser’s self and non-a thorized re-
engineering to the electrical and control systems.
12
Electrical Installation

CH-HRV1.5KDC to HRV10KDC Models
13
Wiring Diagrams

CH-HRV15KDC to HRV20KDC Models
14
Wiring Diagrams

Check that all cable sizes, circ it breakers and wire connections are correct before following below com-
missioning steps:
1. Press the power b tton once for starting; twice for closing. In On stat s, the light of power in-
dicator is on, while in OFF stat s, the light is off.
2. Match the correct fan speeds to each ERV models. Press b tton for 6 seconds to enter
parameter settings and at this time the parameter n mber is shown in the middle of the screen,
press b tton to switch to parameter No. 21 (refer to parameters list in comming page) then
press to enter the parameter setting, defa lt val e (ERV codes) flesh at the right corner,
press UP and DWON b ttons to change the codes to mach the correct ERV models according to
below table, then press b tton again to confirm setting.
3. Then check the mode and fan speed switch. Press b tton to switch , or mode,
check whether the temperat re of the corresponding mode is correct. Press to switch the fan
speed of and , check if the airflow is adj sted corresponding to n mber 1-10 (stands for 10
speeds control in screen middle)
4. Check the operation of bypass. The defa lt opening temperat re of bypass is 19-21C (adj stable),
press b tton to check the temperat re of . If the is 19-21C, the bypass will open a to-
matically. If the o tdoor temperat re is not within 19-21C, then adj st the bypass opening tem-
perat re according the c rrent to temperat re to check the bypass f nction.
5. Bypass open temperat re setting: press more than 6 seconds to enter the parameter setting
mode. Press twice to switch the parameter n mber from 00 to 02, the val e flashes shown at
the right corner, the defa lt val e is 19. Then press to modify the val e according to the c r-
rent temperat re by pressing p-down b tton and press to save the data. At the same time,
check the bypass is opened or not. Please remember to modify the bypass opening temperat re to
19-21 after the commissioning .
Loose or incorrect wiring connection can
ca se explosion or fire when the nit starts
to work. Use only rated power voltage.
Don’t p t fingers or objects into vents of
fresh air or exha st air s pply. Inj ry may
be ca sed by the rotation of the impeller.
Don’t install, move or re-install the nit by
yo rself. Improper action may ca se nit
instability, electric shock or fire.
Don’t change, disassemble or repair the
nit by yo rself. Improper action may ca se
electric shock or fire.
R nning the nit contin o sly in an abnormal
stat s may ca se fail re, electric shock or
fire.
Switch off the power and breaker when yo
clean the exchanger.
Don’t site intake s pply vent in hot and h -
mid
conditions , as it may ca se fail re, c rrent
leakage or fire.
Don’t p t any b rner directly facing the
fresh air discharge, otherwise it may ca se
an ins fficient b rning.
Isolate power d ring extended off periods
Isolate power and take care when cleaning
nit. (Risk of electric shock)
Observe g idelines and reg lations relating
to incomplete comb stion when se is asso-
ciated with f el b rning appliances.
Clean the filter reg larly. A blocked filter may
res lt in poor indoor air q ality.
15
Commissioning
Code Models Code Models
6
CH-HRV1.5KDC
1
CH-HRV8KDC
5
CH-HRV2.5KDC
2
CH-HRV10KDC
4
CH-HRV3.5KDC
1
CH-HRV15KDC
3
CH-HRV5KDC
2
CH-HRV20KDC
0
CH-HRV6.5KDC

The intelligent controller is s rface mo nted and comes with a LCD display screen.
The standard connection cable is 5 meters, b t yo can prepare extra cable if necessary.
LCD display screen
Control Panel
16
S pply air
S pply air temperat re
Power on
Time display
Week display
Bypass on
Ret rn air
Ret rn air temperat re
O tdoor air
O tdoor air temperat re
Timer period
RA fan speed
Intelligent Controller Instr ction

Time decrease
Time increase
Temperat re increase Temperat re decrease
Leave the operation
Mode switch
Useless
Useless Air velocity setting
Useless
Time setting
Choose a day Weekly timer on Weekly timer off
Data save and f nction
Operation Instr ctions
1. ON/OFF: press ON/OFF b tton once for starting; twice for closing. In ON stat s, the light of power
indicator is on, and the ventilator begins to r n. In OFF stat s, the light is off and the ventilator stops.
2. Mode switch: press MODE to choose to display the oA/rA/SA/Fr stat s.
3. Air velocity setting: press FAN b tton to adj st the air velocity. Users can set the ret rn air velocity
in “rA” stat s, and set the s pply air velocity in “SA” stat s. Fan speeds will be shown in n mber from 1
-10 means 10 different speeds.
4. Time setting: time records if power off. If ser need to reset the time, please press the CLOCK b t-
ton, when the colon of the clock stills, press it again, then the ho r flashes, sers can press b tton to
adj st the ho r; then press the CLOCK b tton again to adj st the min te in the same way, the interval
is 10 min tes. After setting, please press SET b tton to save the data or press EXIT to leave the opera-
tion witho t saving the data. If no operation in 8 seconds, display will disappear and all setting is inva-
lid.
5. Day setting: press DAY b tton, when the day code flashes, select the day by pressing b tton and .
After setting, please press SET b tton to save the data or press EXIT to exit witho t saving the data.
If no operation in 8 seconds, display will disappear and all setting is invalid.
6. Weekly timer on: press TIMER ON b tton, all the days display, then press this b tton to switch the
ho r->min te->invalidation of timer. Users can set the ho r and min te when flashing. When it shows
“--:--”; it means timer is invalid. Besides, sers can press DAY b tton to switch the day, the day flashed
when chosen. After setting, please press SET b tton to save the data or press EXIT to leave the opera-
tion witho t saving the data. In the stat s of TIMER ON, code “1” “2” stands for the first or second pe-
riod of timer. User can choose the period of timer by pressing the b tton of “MODE”. If no operation in
8 seconds, display will disappear and all setting is invalid.
Display screen Power on/off
Power on indicator
17
Intelligent Controller Instr ction

7. Weekly timer off: press TIMER OFF b tton, all the days display, then press this b tton to switch the
ho r->min te->invalidation of timer. Users can set the ho r and min te when flashing. When it shows
“--:--”; it means timer is invalid. Besides, sers can press DAY b tton to switch the day, the day flashed
when chosen.
After setting, please press SET b tton to save the data or press EXIT to leave the operation witho t
saving the data. In the stat s of TIMER OFF, code “1” “2” stands for the first or second period of timer.
User can choose the period of timer by pressing the b tton of “MODE”. If no operation in 8 seconds,
display will disappear and all setting is invalid.
8. Check weekly timer: press DAY b tton, and press b tton ◄ and to choose the day, then the set
timer on and timer off will display. Users can press TIMER ON or TIMER OFF b tton to check the exact
time.
9. The r nning of weekly timer: the control system will record the c rrent time, the ventilator starts to
r n a tomatically when the timer is on, if the nit is on already, it maintains r nning. On the other
hand, it stops when the timer is off, if it is off already, it remains stop stat s. The timer on and off can
be sed independently or sim ltaneo sly. When the timer is ON/OFF, sers can still change the ON/OFF
stat s of the nit.
10. Parameter List of Controller are kept after restarting from power-off.
11. temperat re setting, after connecting the electrical heater to the PCB (LD3 and LD4), then can set
the temperat re by temperat re increase and decrease b ttons, when SA temperat re lower than set-
ting temperat re then electrical heater on
1) 0℃＜setting temperat re - SA temperat re＜5 ℃，1st stage heater on, 2nd stage heater off
2) Setting temperat re - SA temperat re ＞5℃，1st and 2nd stage heater on
No. Contents Range Defa lt Record Position
00 Power to a to restart 0-1 1 Main control
01 Electrical heater available 0-1 0 Main control
02 Bypass opening temperat re X 5-30 19 Main control
03 Bypass opening temperat re
range Y
2-15 3 Main control
04 Defrosting interval 15-99 30 Main control
05 Defrosting entering tempera-
t re
-9-5 - 1 Main control
06 Defrosting d ration time 2-20 10 Main control
07 CO2 sensor f nction val e 28-C8
(392-1960PPM)
66
(1000PPM)
Main control
08 ModB s address 1-16 1 Main control
Unit
℃
℃
Min te
℃
Min te
PPM
21 ERV models match/selection 0-7 Main control
23 Fan speed control 0: 2 speeds
1: 3 speeds
2: 10 speeds (DC)
2
24 M ltif nction setting 0: Reserved
1: Sweep filter alarm
2: sweep weekly timer
0
25 Filter alarm setting 0: 45 days
1: 60 days
2: 90 days
3: 180 days
0 Main control
18
Intelligent Controller Instr ction

12. Instr ction of Parameter Settings
1) The control panel is in parameter setting mode via pressing the MODE b tton more than 6 seconds.
2) In the parameter setting mode, the valid parameter n mber (00/01/02/03/04/05/06/07/08/21/23/
23/24/25) is shown in the middle of the screen, press b tton SET to switch the parameter n mber.
Then press MODE to enter the parameter setting, the defa lt val e at the right corner flashes, press the
p-down b tton to adj st the data. After setting, press SET b tton to save all the data. After 10 sec-
onds, the control panel begins to record the parameters. The setting is proved to be s ccessf l if the
parameters
13. Bypass opening parameter setting
1) The bypass is opened on the condition that the o tdoor temperat re is eq al or higher than X and
less than X+Y.
2) The bypass is closed on other conditions.
14. EA fan defrosting mode
When EA side of heat exchanger temperat re lower than –1℃(defrosting entering temperat re, adj st-
able) and last for 1 min te, and the interval of defrosting is longer than 30 min tes (adj stable), the
exha st fan will r n at high speed a tomatically for defrosting, and s pply fan will stop, ntil EA side
temperat re higher than defrosting entering temperat re +15℃ for 1 min te, or the defrosting time is
longer than 10 min tes (adj stable)
15. Filter Alarm, to set the filter alarm nder parameter 25, the symbol flash as the filter alarm to
remind c stomer to clean the filters, to sweep filter alarm by setting parameter 24 val e 1.
16. Error code, press set b tton for short to check the Error code, please refer to below error code table
Code
E1 Fresh air temperat re sensor error
E2 EEPROM error
E3 Ret rn air temperat re sensor error
Error
E4 Exha st air temperat re sensor er-
ror (defrosting temperat re error)
E5 Comm nication error
E6 S pply air temperat re sensor error
E7 Exha sted fan error
E8 S pply fan error
19
Intelligent Controller Instr ction

Introd ction of dial switch
Dial switch
1. SW4-1: OFF-Traditional EA fan defrost ON-OA side electrical heater defrost
2. SW4-2: OFF-Auto by- ass and manual by ass via voltage free connector (free cooling)
3. SW4-3: OFF-CO2 sensor ON-Humidity and tem erature sensor
4. SW4-4: Reserve
Attention: Please cut off the ower before dialing.
1. SW4-1 is switching the defrost mode. Defa lt is “off”, it means traditional defrost by EA fan. When
t rn to “on”, the defrost mode is changed to be OA side heater defrost (req ired to connect the heater
to the OA d ct, only s ggested in winter nder –15℃), at this time the parameter 01 wo ld be t rned
to 0 a tomatically and the s pply air side electrical heater is not able to se.
Under electrical heater defrost mode, controller can a tomatic drive the electric heater on/off to heat
the fresh air in order to prevent frosting at the EA side of heat exchanger.
1) If the o tdoor fresh air temperat re < -15⁰C, the OA heater t rns on for 50 min tes, then the venti-
lator switches off for 10 min tes and restarts.
2) If the OA heater switches on and the exha st air temperat re still <-1⁰C, then the ventilator will
stops for 50 min tes.
3) If the exha st air temperat re <-1⁰C and the o tdoor air temperat re >-15⁰C, the OA heater
switches on for 10 min tes for defrosting.
4) If the OA heater is on and temperat re of o tdoor air is >+25⁰C, then OA heater will stop for 5 min-
tes, If the o tdoor air temperat re is detected over 25℃ by sensor over 3 times, electrical heater
stops.
2. SW4-2 is the by-pass mode. Defa lt is “off”, it means that by-pass will open a tomatically based on
the o tdoor temperat re. After connecting the bypass free voltage connector (refer to the wiring dia-
gram), then bypass damper opens man ally and fans r n at high speed.
3. SW4-3 is switching the forced ventilation mode. Defa lt is “off”, it means that ventilator is controlled
by CO
2
sensor. When t rn to “on”, the ventilator is controlled by “h midity and temperat re” sensor or
together with the CO2 sensor. if SW4-3 t rn to “ON” b t witho t connecting “h midity and tempera-
t re” sensor, then E3 error happen.
4. SW4-4 is reserved.
External ON/OFF switch control logic
External switch can receive voltage free signal to control the ventilator on or off.
-Ventilator off, when ventilator have external on signal, ventilator r n at high speed, when ventilator
have external off signal, ventilator ret rn back to off.
- Ventilator on, when ventilator have external on signal, ventilator r n at high speed, when ventilator
have external off signal, ventilator ret rn back to previo s fan speed
20
Intelligent Controller Instr ction