Lennox iComfort M30, Installation And Setup Manual

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Table 13. Dew Point Control Modes
Option Description
Max
Max Dew Point Control mode is also useful in colder
climates where moisture can collect on interior
window surfaces. Max Dew point control helps
to minimize this condensation. In this mode the
activation and deactivation of H terminal is controlled
as it is done in the Max.
RH set point= .5*Outdoor Temp + 25 + RH user dew
point adjustment
where:
RH user dew point adjustment is user-selectable and
cannot /-15%, default RH user dew point
adjustment = 0
The RH set point cannot exceed 45%
Ventilation Control
This equipment is designed to provide fresh air
while exhausting an equal amount of stale air.
Ventilation Rates
The S30 ventilation function is only a turn on - turn
off feature. All CFMs must be adjusted from the
HRV/ERV unit. The ventilation function can be
controlled by outdoor temperatures and by timers
in the thermostat. The ventilation feature can also
control 1 and 2 stages of ventilation operation.
Thermostat ventilation CFM parameters are to
be adjusted only after the HRV/ERV set up is
completed and the CFMs are known. Once the
thermostat’s CFMs are adjusted they are used with
the thermostat’s timer algorithm to determine how
long to run the HRV/ERV.
Energy Recovery Ventilator (ERV)
The ERV unit is equipped with an enthalpic core.
This device is designed for use in warm, humid
climates with heavy air conditioning loads. The ERV
unit transfers both sensible (temperature) and latent
(moisture) heat from incoming fresh air to the stale
air as it is being exhausted; thus, reducing the air
conditioning load.
Heat Recovery Ventilator (HRV)
The HRV unit is equipped with an aluminum core.
The device uses the stale air that is being exhausted
to condition the fresh air as it is being brought in.
Parameter settings and descriptions are listed in
“Table 5. Advanced Settings” on page 14. The
table below list which parameters are available for
the Fresh Air Damper, ERV and HRV equipment.
Fresh Air Damper
This option is used to control a damper connecting
outside air to the return plenum of the system. When
a fresh air damper style of ventilation is added to the
system, and ventilation is required, the ventilation
demand is serviced by energizing one relay to close
or open the relay contacts connected to the fresh air
damper and commanding the blower to run at a rate
of at least the continuous fan speed.