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The ERV has an electronically controlled defrost system. The defrost cycle is activated when the outdoor temperature drops below
27°F (−3°C). Incoming fresh air temperature is constantly measured to determine if defrost is required. The three defrost settings are:
• At 27°F (−3°C) ERV runs in defrost for 3 minutes and runs in ventilation for 25 minutes
• At −4°F (−20°C) ERV runs in defrost for 4.5 minutes and runs in ventilation for 17 minutes
• At −31°F (−35°C) ERV runs in defrost for 7 minutes and runs in ventilation for 15 minutes
No remote device can override this defrost mode until the cycle is complete. After the cycle is completed, the ERV defaults to
previous settings. If the cycle is completed and the thermistor continues to measure defrost temperature the defrost cycle is
repeated.
Applicable Unit:
SYNC-270TCE-S1
During defrost a motor driven damper door mechanism closes off the supply air from outside allowing exhaust air to recirculate
through the unit’s core. During the defrost portion of the cycle no ventilation is occurring. After the defrost portion of the cycle, the
damper operates in the opposite direction to reopen the fresh air port. The defrost cycle repeats until the temperature rises above
27°F (−3°C).
Defrost Cycle
Recirculating Damper Defrost
Applicable Units: ASSURE-120S-S1, SYNC-110SE-S1, and SYNC-180SCE-S1
During defrost the supply fan shuts off while the exhaust fan continues to operate. This allows the heat from the exhaust air to
defrost the unit’s core. During the defrost portion of the cycle, the unit operates with only exhaust ventilation. After the defrost
portion of the cycle, the supply fan powers on and operates with balanced ventilation. The defrost cycle repeats until the
temperature rises above 27°F (−3°C).
Fan Defrost
Residential Energy Recovery Ventilators
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