I think I found a bug with the ERV feature in eQuest related to
temperature control. My input is as follows:

RECOVER-EXHAUST = YES

ERV-RECOVER-TYPE = ENTHALPY-WHEEL

ERV-SENSIBLE-EFF = 0.75

ERV-LATENT-EFF = 0.75

ERV-RUN-CTRL = OA-EXHAUST-DT

ERV-TEMP-CTRL = MIXED-AIR-RESET

ERV-CAP-CTRL = MODULATE-HX

ERV-HX-KW = 0.207

ERV-FANS = HVAC-SUPPLY/RETURN

ERV-OA-STATIC = 0.5

ERV-EXH-STATIC = 0.5

ERV-FROST-CTRL = USE-CAP-CTRL

The system shows heating savings as expected, and cooling savings during
summer periods, but during winter there is a large cooling penalty.
Hourly reports show an unexpected cooling load during winter night mode
operation. If I set ERV-OA-STATIC to zero, that cooling load goes away.

If I change to a fan located in the ERV, the unexpected cooling load is
still absent:

ERV-FANS = SELF-CONTAINED

ERV-EXH-KW/FLOW = 0.002

Thus, it appears that the heat gain due to friction in the heat wheel is
not taken into account for the OA setpoint during night mode when
ERV-FANS = HVAC-SUPPLY/RETURN. Has anyone else seen this problem?

The SELF-CONTAINED option appears to be a work-around, but it is not as
convenient for add-on heat wheels.

Thanks,

Doug Maddox, PE