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ELECTRICAL CONNECTIONS
WARNING
UNPLUG THE LINE CORD BEFORE WORKING ON UNIT.
Run 120V house wiring to the location of the fan.The unit comes with a grounded 3 prong
power cord for connection to an electrical outlet.
The unit has an optional terminal block for 24VAC HVAC/AHU blower integration（connect 1
and 2 . If necessary, the user can connect the HVAC/AHU 24VAC dry contact relay to the
terminal block so that anytime the ERV is operating, the HVAC/AHU blower operates to help
distribute the fresh air through the existing ductwork (not required).
The unit has an optional terminal block for a MANUAL OVERRIDE SWITCH (MOS) connection
（connect 5 and 6 . Connect an on/off switch to the terminal block for MOS connection to
manually switch the unit to high speed. When the switch is off, the unit returns to the low speed
operation per the OA, RA, and T knobs (not required).
The unit has an optional terminal block for wall switch（connect 3 and 4). If necessary, the
user can connect the wall switch to control the unit on/off.
The unit has an optional terminal block for a WALL TIMER SWITCH(WTS) connection
(connect 4, 5 and 6) .In case of the timer activation, the unit goes to the highspeed mode
and runs for the set time.
OPTIONAL CONNECTIONS:
1. The unit has an optional terminal block for 24VAC HVAC/AHU blower
integration. The user can connect the HVAC/AHU 24VAC dry contact relay
to the terminal block so that when the ERV is operating, the HVAC/AHU
blower operates to help distribute the fresh air through the existing
ductwork if needed.
2. The unit has an optional terminal block for a MANUAL OVERRIDE
SWITCH (MOS) connection. Connect an on/off switch to the terminal block
to manually switch the unit to high speed. When the switch is off, the unit
returns to the low speed operation per the OA, RA, and T knobs.
3. The unit has an optional terminal block for a WALL TIMER SWITCH
(WTS) connection.In case of the timer activation, the unit goes to the high
speed mode and runs for the set time.
The optional terminal block are not required for the unit.
WALL TIMER SWITCH (WTS) OPERATION
1. Press button, L1 Indicator light up, timer setting for 20 mins, ERV run at high-speed, after timer delay of 20
mins, ERV get back to low speed operation per the OA, RA, and T knobs and indicator go out.
2. Press button twice quickly, the L2 indicator light up, timer setting for 40 minutes, the ERV run at high-speed;
and the L1 and L2 indicator light up after 20 minutes; ERV get back to low speed operation per the OA, RA, and
T knobs after 40 mins and indicator go out.
3. Press button 3 times quickly, the L3 indicator light up, timer setting for 60 minutes, the ERV run at
high-speed, and the L2 and L3 indicator light up after 20 minutes; the L1 and L3 indicator light up after 40 mins;
ERV get back to low speed operation per the OA, RA, and T knobs after 60 mins and indicator go out.
4. Press switch 4 times, Cont indicator light up and ERV go into high speed running, press switch again, Cont
dicator put out, ERV runs at the speeds and timer delay per knobs adjusted
CAUTION
IF THERE IS NO WALL SWITCH, IT NEEDS TO BE SHORT-CIRCUITED THE OPTIONAL TERMINAL
BLOCK FOR WALL SWITCH, OTHERWISE THE MACHINE HAS NO POWER.
Terminal
Switch
PCB
7
6
5
4
3
2
1
terminal block
DC12V
OUT
6
5
4
3
block
2
1
Relay
DC12V
OUT(5V)
RH&Temp.Sensor
OPTION FOR
MOS CONNECTION
Wall Switch
OUT(5V)
DC12V
GND
L1 Indicator light
L2 Indicator light
L3 Indicator light
Cont indicator light
www.ortechindustries.ca
WALL MOUNTING
TIMER SWITCH
MOS connection
WALL SWITCH
24VAC connection
WALL
5V
(
)
TIMER
GND
SWITCH
MANUAL
OVERRIDE
SWITCH
WALL
SWITCH
AHU
20min
40min
Wall TIMER Switch
60min
60min
Cont.
PUSH
PUSH
OPTION FOR
WTS CONNECTION
20min
40min
60min
60min
Cont.
PUSH
PUSH
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