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Sequence of Operation (continued)
NO
YES
Terminal
block LED flashes
rapidly for 3
seconds
NO
SYSTEM
POWER ON
Thermistor cable not
connected into
controller board
NO
YES
Self−test mode
: fan will cycle for 6 seconds in each
speed from speed 1 to 5; damper will be ventilation posi-
tion during speed cycling. After speed 5, damper defrost
models will cycle to recirculation, ventilation, then back to
recirculation or fan defrost models will cycle to exhaust
fan only, ventilation, then off.
Terminal
block LED flashes
to indicate
revision
YES
Terminal
block LED flashes
during self test,
3 sec. ON and
0.5 sec. OFF
NO
Upon self-test
completion, normal
HRV/ERV operation is
available.
YES
NOTES:
1)
System includes HRV/ERV unit and terminal block.
2)
System power ON means HRV unit plugged into 120VAC.
3) Dry contact is energized when HRV/ERV is in ventilation mode and
results in a closed connection between terminal 7 (COM) and 8 (NO)
of the terminal block
4) Low speed refers to speed 1.
5) High speed refers to speed 5.
6) Ventilation position refers to damper open to outdoor air.
7) Recirculation position refers to damper closed to outdoor air.
8) No fan operation results in damper in recirculation position.
9) Humidity disable results in 4 consecutive readings of outdoor tem-
perature greater than 60ºF (15ºC).
Self−Test Operational
Flowchart
2
Failed
HRV/ERV
controller
NO
YES
NO
Refer to interface
operation instructions.
Fan may operate based
on interface settings.
Interface
control with ON/OFF
connected
Jumper ON to
RED plus LOW
Standby mode
jumper ON toRED
2
Jumper ON to
RED plus HI
Jumper ON to
RED plus BLK
No fan
operation. Damper
in recirculation
position
FAN
ON
FAN
OFF
YES
Fan override
to a higher speed from
interface control
Is
Humidity Disable
activated by outdoor
temperature
YES
NO
YES
3
Terminal Block Operation
Low Fan operation can be overridden to higher speeds by an external control setting or function such as:
A)
Y2169 20/40/60 minute timer manually activated − running speed 5
B)
Y2168 20 minute timer manually activated − running speed 5
C)
Y2166 climate control with dehumidistat activated by humidity level − running speed 5
D)
Defrost mode auto-activated function − running speed 4 (HRV only)
Standby mode ˘ Jumper 2 (ON) to 3 (RED)
Low speed fan ˘ Jumper 2 (ON) to 3 (RED) to 1 (LOW)
HI speed fan ˘ Jumper 2 (ON) to 3 (RED) to 6 (BLK)
High Speed Overrides
Fan in
LOW speed
ventilation
Fan in
HIGH speed
ventilation
NO
Normal
operation
Failed
HRV/ERV
controller
No FAN
operation
NO
NO
YES
YES
YES
NO
YES
NO
NOTES − Operation of HRV/ERV
without external control:
Terminal 1 LOW
Terminal 2 ON
Terminal 3 RED
Terminal 4 YEL
Terminal 5 GND
Terminal 6 HIGH
Terminal 7 COM
Terminal 8 NO
Terminal 9 NC
Terminal 10 BLK
Normal
operation
operation
verified
issue detected;
action required
KEY
operation
verified
issue detected;
action required
KEY