The ERV and HRV units are equipped with an automatic defrost feature to eliminate any ice build up on the core.
• Automatic defrost is initiated once every hour when the fresh air supply temperature drops to 23°F (-5°C) or
colder.
• The defrost cycle operates by turning off the supply fan while continuing to operate the exhaust fan.
• The exhaust fan speed is adjusted proportionally based on the outdoor temperature, initially operating at low
speed.
• As the outdoor temperature continues to drop, the exhaust fan speed will increase, and will operate at
maximum speed when the outdoor temperature is -4°F (-20°C) or less.
• TheVNT5070SeriesHRV/ERVdefrostcyclerunsfor5minuteswiththesupplyfanofffollowedby35minutes
of continuous normal operation.
• The VNT5150 Series HRV/ERV defrost cycle runs for 5 minutes with the supply fan off followed by 35 minutes
of continuous normal operation.
• The VNT5200 Series HRV/ERV defrost cycle runs for 4 minutes with the supply fan off followed by 40 minutes
of continuous normal operation.
• VNT6150H1000 and 6200H1000 HRV cycle runs for 8 minutes with the supply fan off followed by 32 minutes
of continuous normal operation.
• Defrost cycles will continue to repeat as long as the temperature is 23°F (-5°C) or less.
TrueFRESH™ ERV/HRV Ventilation Systems 69-2480EF—17
24
The wiring terminal block is located behind the control module door on the side of the unit.
To access the terminal block, open the control panel door by swinging it open and to the right as shown above.
CAUTION: Voltage hazard.
Can cause equipment damage.
Disconnect power from the unit before beginning installation.
Terminal Description
Automated Defrost
Wiring
NC
NO
G
R
INTERLOCK
COM
G
LVC – L1
RLY1
B
W
REMOTES
CASE GND
Vectouch
B1
D1
Z13
SW3
G
R
B
TIMER
COM PORT
SW2
SW1
JP2
JP1
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