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Lennox ZGB Series - Enthalpy Control and Damper Settings; Free Cooling Setpoint Adjustment; Damper Minimum Position and DCV Settings

Lennox ZGB Series
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ξ˜³ξ™„ξ™Šξ™ˆξ˜ƒξ˜—ξ˜š
A6 ENTHALPY CONTROLLER
A
B
C
D
Open
Min
Pos
FREE COOLING SETPOINT;
A=Completely counterclockwise
D=Completely clockwise
OUTDOOR AIR
SUITABLE LED
Free
Cool
DCV
EXH
EXH
Set
2V 10V
DCV
Max
2V 10V
DCV
Set
2V 10V
IAQ SETPOINT
IAQ READING IS
ABOVE SETPOINT
MUM POSITION
IAQ MAXIMUM
POSITION
(set higher than
minimum position)
FIGURE 27
Free Cooling Setpoint
Outdoor air is considered suitable when temperature and
humidity are less than the free cooling setpoints shown
ξ™Œξ™‘ξ˜ƒξ™—ξ™„ξ™…ξ™ξ™ˆξ˜ƒξ˜”ξ˜–ξ˜‘ξ˜ƒξ˜Άξ™ˆξ™—ξ™—ξ™Œξ™‘ξ™Šξ˜ƒξ˜€ξ˜ƒξ™Œξ™–ξ˜ƒξ™•ξ™ˆξ™†ξ™’ξ™ξ™ξ™ˆξ™‘ξ™‡ξ™ˆξ™‡ξ˜‘ξ˜ƒξ˜Άξ™ˆξ™ˆξ˜ƒξšΏξ™Šξ™˜ξ™•ξ™ˆξ˜ƒξ˜•ξ˜šξ˜‘ξ˜ƒξ˜€ξ™—ξ˜ƒ
ξ™–ξ™ˆξ™—ξ™—ξ™Œξ™‘ξ™Šξ˜ƒξ˜€ξ˜ξ˜ƒξ™‰ξ™•ξ™ˆξ™ˆξ˜ƒξ™†ξ™’ξ™’ξ™ξ™Œξ™‘ξ™Šξ˜ƒξ™šξ™Œξ™ξ™ξ˜ƒξ™…ξ™ˆξ˜ƒξ™ˆξ™‘ξ™ˆξ™•ξ™Šξ™Œξ™ξ™ˆξ™‡ξ˜ƒξ™šξ™‹ξ™ˆξ™‘ξ˜ƒξ™’ξ™˜ξ™—ξ™‡ξ™’ξ™’ξ™•ξ˜ƒξ™„ξ™Œξ™•ξ˜ƒ
ξ™Œξ™–ξ˜ƒξ™„ξ™“ξ™“ξ™•ξ™’ξ™›ξ™Œξ™ξ™„ξ™—ξ™ˆξ™ξ™œξ˜ƒξ˜šξ˜–ξšƒξ˜©ξ˜ƒξ˜‹ξ˜•ξ˜–ξšƒξ˜¦ξ˜Œξ˜ƒξ™„ξ™‘ξ™‡ξ˜ƒξ˜˜ξ˜“ξ˜ˆξ˜ƒξ™•ξ™ˆξ™ξ™„ξ™—ξ™Œξ™™ξ™ˆξ˜ƒξ™‹ξ™˜ξ™ξ™Œξ™‡ξ™Œξ™—ξ™œξ˜‘ξ˜ƒ
ξ˜¬ξ™‰ξ˜ƒξ™Œξ™‘ξ™‡ξ™’ξ™’ξ™•ξ˜ƒξ™„ξ™Œξ™•ξ˜ƒξ™Œξ™–ξ˜ƒξ™—ξ™’ξ™’ξ˜ƒξ™šξ™„ξ™•ξ™ξ˜ƒξ™’ξ™•ξ˜ƒξ™‹ξ™˜ξ™ξ™Œξ™‡ξ˜ξ˜ƒξ™ξ™’ξ™šξ™ˆξ™•ξ˜ƒξ™—ξ™‹ξ™ˆξ˜ƒξ™–ξ™ˆξ™—ξ™“ξ™’ξ™Œξ™‘ξ™—ξ˜ƒξ™—ξ™’ξ˜ƒξ˜₯ξ˜‘ξ˜ƒ
ξ˜€ξ™—ξ˜ƒξ™–ξ™ˆξ™—ξ™—ξ™Œξ™‘ξ™Šξ˜ƒξ˜₯ξ˜ξ˜ƒξ™‰ξ™•ξ™ˆξ™ˆξ˜ƒξ™†ξ™’ξ™’ξ™ξ™Œξ™‘ξ™Šξ˜ƒξ™šξ™Œξ™ξ™ξ˜ƒξ™…ξ™ˆξ˜ƒξ™ˆξ™‘ξ™ˆξ™•ξ™Šξ™Œξ™ξ™ˆξ™‡ξ˜ƒξ™„ξ™—ξ˜ƒξ˜šξ˜“ξšƒξ˜©ξ˜ƒξ˜‹ξ˜•ξ˜”ξšƒξ˜¦ξ˜Œξ˜ƒ
ξ™„ξ™‘ξ™‡ξ˜ƒξ˜˜ξ˜“ξ˜ˆξ˜ƒξ™•ξ™ˆξ™ξ™„ξ™—ξ™Œξ™™ξ™ˆξ˜ƒξ™‹ξ™˜ξ™ξ™Œξ™‡ξ™Œξ™—ξ™œξ˜‘
ξ˜Ίξ™‹ξ™ˆξ™‘ξ˜ƒξ™„ξ™‘ξ˜ƒξ™’ξ™“ξ™—ξ™Œξ™’ξ™‘ξ™„ξ™ξ˜ƒξ˜€ξ˜™ξ˜•ξ˜ƒξ™‡ξ™Œσ°€¨ξ™ˆξ™•ξ™ˆξ™‘ξ™—ξ™Œξ™„ξ™ξ˜ƒξ™–ξ™ˆξ™‘ξ™–ξ™’ξ™•ξ˜ƒξ™Œξ™–ξ˜ƒξ™Œξ™‘ξ™–ξ™—ξ™„ξ™ξ™ξ™ˆξ™‡ξ˜ξ˜ƒξ™—ξ™˜ξ™•ξ™‘ξ˜ƒ
ξ˜€ξ˜™ξ˜ƒ ξ™ˆξ™‘ξ™—ξ™‹ξ™„ξ™ξ™“ξ™œξ˜ƒ ξ™†ξ™’ξ™‘ξ™—ξ™•ξ™’ξ™ξ˜ƒ ξ™‰ξ™•ξ™ˆξ™ˆξ˜ƒ ξ™†ξ™’ξ™’ξ™ξ™Œξ™‘ξ™Šξ˜ƒ ξ™–ξ™ˆξ™—ξ™“ξ™’ξ™Œξ™‘ξ™—ξ˜ƒ ξ™“ξ™’ξ™—ξ™ˆξ™‘ξ™—ξ™Œξ™’ξ™ξ™ˆξ™—ξ™ˆξ™•ξ˜ƒ
ξ™†ξ™’ξ™ξ™“ξ™ξ™ˆξ™—ξ™ˆξ™ξ™œξ˜ƒξ™†ξ™ξ™’ξ™†ξ™Žξ™šξ™Œξ™–ξ™ˆξ˜ƒξ™—ξ™’ξ˜ƒξ™“ξ™’ξ™–ξ™Œξ™—ξ™Œξ™’ξ™‘ξ˜ƒξš³ξ˜§ξš΄ξ˜‘
TABLE 13
ENTHALPY CONTROL SETPOINTS
Control Setting ξ˜©ξ™•ξ™ˆξ™ˆξ˜ƒξ˜¦ξ™’ξ™’ξ™ξ™Œξ™‘ξ™Šξ˜ƒξ˜Άξ™ˆξ™—ξ™“ξ™’ξ™Œξ™‘ξ™—ξ˜ƒξ˜€ξ™—ξ˜ƒξ˜˜ξ˜“ξ˜ˆξ˜ƒξ˜΅ξ˜«
A ξ˜šξ˜–ξšƒξ˜ƒξ˜©ξ˜ƒξ˜‹ξ˜•ξ˜–ξšƒξ˜ƒξ˜¦ξ˜Œ
B ξ˜šξ˜“ξšƒξ˜ƒξ˜©ξ˜ƒξ˜‹ξ˜•ξ˜”ξšƒξ˜ƒξ˜¦ξ˜Œ
C ξ˜™ξ˜šξšƒξ˜ƒξ˜©ξ˜ƒξ˜‹ξ˜”ξ˜œξšƒξ˜ƒξ˜¦ξ˜Œ
D ξ˜™ξ˜–ξšƒξ˜ƒξ˜©ξ˜ƒξ˜‹ξ˜”ξ˜šξšƒξ˜ƒξ˜¦ξ˜Œ
Damper Minimum Position
1 - Set thermostat to occupied mode if the feature is
ξ™„ξ™™ξ™„ξ™Œξ™ξ™„ξ™…ξ™ξ™ˆξ˜‘ξ˜ƒξ˜°ξ™„ξ™Žξ™ˆξ˜ƒξ™–ξ™˜ξ™•ξ™ˆξ˜ƒξ™˜ξ™‘ξ™Œξ™—ξ˜ƒξ˜•ξ˜—ξ˜Ήξ˜ƒξ™†ξ™’ξ™‘ξ™—ξ™•ξ™’ξ™ξ˜ƒξ™ξ™ˆξ™„ξ™‡ξ™–ξ˜ƒξ˜΅ξ˜ƒξ™„ξ™‘ξ™‡ξ˜ƒ
OC are connected if using a thermostat which does
not have the feature.
2 - ξ˜ƒξ˜ƒξ˜΅ξ™’ξ™—ξ™„ξ™—ξ™ˆξ˜ƒξ˜°ξ˜¬ξ˜±ξ˜ƒξ˜³ξ˜²ξ˜Άξ˜ƒξ˜Άξ˜¨ξ˜·ξ˜ƒξ™“ξ™’ξ™—ξ™ˆξ™‘ξ™—ξ™Œξ™’ξ™ξ™ˆξ™—ξ™ˆξ™•ξ˜ƒξ™—ξ™’ξ˜ƒξ™„ξ™“ξ™“ξ™•ξ™’ξ™›ξ™Œξ™ξ™„ξ™—ξ™ˆξ˜ƒ
desired fresh air percentage.
Note - Damper minimum position can be set lower
than traditional minimum air requirements when
an IAQ sensor is specied. Dampers will open to
DCV MAX setting (if CO2 is above setpoint) to meet
traditional ventilation requirements.
3 - Measure outdoor air temperature. Mark the point
ξ™’ξ™‘ξ˜ƒξ™—ξ™‹ξ™ˆξ˜ƒξ™…ξ™’ξ™—ξ™—ξ™’ξ™ξ˜ƒξ™ξ™Œξ™‘ξ™ˆξ˜ƒξ™’ξ™‰ξ˜ƒξ™†ξ™‹ξ™„ξ™•ξ™—ξ˜ƒξ˜”ξ˜ƒξ™„ξ™‘ξ™‡ξ˜ƒξ™ξ™„ξ™…ξ™ˆξ™ξ˜ƒξ™—ξ™‹ξ™ˆξ˜ƒξ™“ξ™’ξ™Œξ™‘ξ™—ξ˜ƒξš³ξ˜€ξš΄ξ˜ƒ
ξ˜‹ξ˜—ξ˜“ξ˜©ξ˜ξ˜ƒξ˜—ξ˜¦ξ˜ƒξ™–ξ™‹ξ™’ξ™šξ™‘ξ˜Œξ˜‘
ξ˜—ξ˜ƒξ˜ξ˜ƒ Measure return air temperature. Mark that point on
ξ™—ξ™‹ξ™ˆξ˜ƒξ™—ξ™’ξ™“ξ˜ƒξ™ξ™Œξ™‘ξ™ˆξ˜ƒξ™’ξ™‰ξ˜ƒξ™†ξ™‹ξ™„ξ™•ξ™—ξ˜ƒξ˜”ξ˜ƒξ™„ξ™‘ξ™‡ξ˜ƒξ™ξ™„ξ™…ξ™ˆξ™ξ˜ƒξ™—ξ™‹ξ™ˆξ˜ƒξ™“ξ™’ξ™Œξ™‘ξ™—ξ˜ƒξš³ξ˜₯ξš΄ξ˜ƒξ˜‹ξ˜šξ˜—ξ˜©ξ˜ξ˜ƒ
ξ˜•ξ˜–ξ˜¦ξ˜ƒξ™–ξ™‹ξ™’ξ™šξ™‘ξ˜Œξ˜‘
5 - ξ˜ƒξ˜ƒξ˜°ξ™ˆξ™„ξ™–ξ™˜ξ™•ξ™ˆξ˜ƒ ξ™ξ™Œξ™›ξ™ˆξ™‡ξ˜ƒ ξ™„ξ™Œξ™•ξ˜ƒ ξ˜‹ξ™’ξ™˜ξ™—ξ™‡ξ™’ξ™’ξ™•ξ˜ƒ ξ™„ξ™‘ξ™‡ξ˜ƒ ξ™•ξ™ˆξ™—ξ™˜ξ™•ξ™‘ξ˜ƒ ξ™„ξ™Œξ™•ξ˜Œξ˜ƒ
temperature. Mark that point on the top line of chart
ξ˜”ξ˜ƒξ™„ξ™‘ξ™‡ξ˜ƒξ™ξ™„ξ™…ξ™ˆξ™ξ˜ƒξ™“ξ™’ξ™Œξ™‘ξ™—ξ˜ƒξš³ξ˜¦ξš΄ξ˜ƒξ˜‹ξ˜šξ˜“ξ˜©ξ˜ξ˜ƒξ˜•ξ˜”ξ˜¦ξ˜ƒξ™–ξ™‹ξ™’ξ™šξ™‘ξ˜Œξ˜‘
ξ˜™ξ˜ƒξ˜ξ˜ƒ Draw a straight line between points A and B.
7 - Draw a vertical line through point C.
ξ˜›ξ˜ƒξ˜ξ˜ƒ Draw a horizontal line where the two lines meet.
ξ˜΅ξ™ˆξ™„ξ™‡ξ˜ƒξ™—ξ™‹ξ™ˆξ˜ƒξ™“ξ™ˆξ™•ξ™†ξ™ˆξ™‘ξ™—ξ˜ƒξ™’ξ™‰ξ˜ƒξ™‰ξ™•ξ™ˆξ™–ξ™‹ξ˜ƒξ™„ξ™Œξ™•ξ˜ƒξ™Œξ™‘ξ™—ξ™„ξ™Žξ™ˆξ˜ƒξ™’ξ™‘ξ˜ƒξ™—ξ™‹ξ™ˆξ˜ƒξ™–ξ™Œξ™‡ξ™ˆξ˜‘
ξ˜œξ˜ƒξ˜ξ˜ƒ ξ˜ƒξ˜¬ξ™‰ξ˜ƒξ™‰ξ™•ξ™ˆξ™–ξ™‹ξ˜ƒξ™„ξ™Œξ™•ξ˜ƒξ™“ξ™ˆξ™•ξ™†ξ™ˆξ™‘ξ™—ξ™„ξ™Šξ™ˆξ˜ƒ ξ™Œξ™–ξ˜ƒξ™ξ™ˆξ™–ξ™–ξ˜ƒξ™—ξ™‹ξ™„ξ™‘ξ˜ƒξ™‡ξ™ˆξ™–ξ™Œξ™•ξ™ˆξ™‡ξ˜ξ˜ƒ ξ™„ξ™‡ξ™ξ™˜ξ™–ξ™—ξ˜ƒ
MIN POS SET potentiometer higher. If fresh air
ξ™“ξ™ˆξ™•ξ™†ξ™ˆξ™‘ξ™—ξ™„ξ™Šξ™ˆξ˜ƒξ™Œξ™–ξ˜ƒξ™ξ™’ξ™•ξ™ˆξ˜ƒξ™—ξ™‹ξ™„ξ™‘ξ˜ƒξ™‡ξ™ˆξ™–ξ™Œξ™•ξ™ˆξ™‡ξ˜ξ˜ƒξ™„ξ™‡ξ™ξ™˜ξ™–ξ™—ξ˜ƒξ˜°ξ˜¬ξ˜±ξ˜ƒξ˜³ξ˜²ξ˜Άξ˜ƒ
ξ˜Άξ˜¨ξ˜·ξ˜ƒξ™“ξ™’ξ™—ξ™ˆξ™‘ξ™—ξ™Œξ™’ξ™ξ™ˆξ™—ξ™ˆξ™•ξ˜ƒξ™ξ™’ξ™šξ™ˆξ™•ξ˜‘ξ˜ƒξ˜΅ξ™ˆξ™“ξ™ˆξ™„ξ™—ξ˜ƒξ™–ξ™—ξ™ˆξ™“ξ™–ξ˜ƒξ˜–ξ˜ƒξ™—ξ™‹ξ™•ξ™’ξ™˜ξ™Šξ™‹ξ˜ƒξ˜›ξ˜ƒ
until calculation reads desired fresh air percentage.
DCV Set and Max Settings
Adjust settings when an optional IAQ sensor is installed.
The DCV SET potentiometer is factory-set at approxi-
ξ™ξ™„ξ™—ξ™ˆξ™ξ™œξ˜ƒξ˜˜ξ˜“ξ˜ˆξ˜ƒξ™’ξ™‰ξ˜ƒξ™—ξ™‹ξ™ˆξ˜ƒξ™“ξ™’ξ™—ξ™ˆξ™‘ξ™—ξ™Œξ™’ξ™ξ™ˆξ™—ξ™ˆξ™•ξ˜ƒξ™•ξ™„ξ™‘ξ™Šξ™ˆξ˜‘ξ˜ƒξ˜Έξ™–ξ™Œξ™‘ξ™Šξ˜ƒξ™„ξ˜ƒξ™–ξ™—ξ™„ξ™‘ξ™‡ξ™„ξ™•ξ™‡ξ˜ƒ
ξ˜”ξ˜ξ˜•ξ˜“ξ˜“ξ˜“ξ™“ξ™“ξ™ξ˜ƒξ˜¦ξ˜²ξ˜•ξ˜ƒξ™–ξ™ˆξ™‘ξ™–ξ™’ξ™•ξ˜ξ˜ƒξ™‡ξ™„ξ™ξ™“ξ™ˆξ™•ξ™–ξ˜ƒξ™šξ™Œξ™ξ™ξ˜ƒξ™–ξ™—ξ™„ξ™•ξ™—ξ˜ƒξ™—ξ™’ξ˜ƒξ™’ξ™“ξ™ˆξ™‘ξ˜ƒξ™šξ™‹ξ™ˆξ™‘ξ˜ƒ
ξ™—ξ™‹ξ™ˆξ˜ƒξ˜¬ξ˜€ξ˜΄ξ˜ƒξ™–ξ™ˆξ™‘ξ™–ξ™’ξ™•ξ˜ƒξ™•ξ™ˆξ™„ξ™‡ξ™–ξ˜ƒξ™„ξ™“ξ™“ξ™•ξ™’ξ™›ξ™Œξ™ξ™„ξ™—ξ™ˆξ™ξ™œξ˜ƒξ˜”ξ˜“ξ˜“ξ˜“ξ™“ξ™“ξ™ξ˜‘ξ˜ƒξ˜€ξ™‡ξ™ξ™˜ξ™–ξ™—ξ˜ƒξ™—ξ™‹ξ™ˆξ˜ƒ
DCV SET potentiometer to the approximate setting speci-
ξšΏξ™ˆξ™‡ξ˜ƒξ™…ξ™œξ˜ƒξ™—ξ™‹ξ™ˆξ˜ƒξ™†ξ™’ξ™‘ξ™—ξ™•ξ™’ξ™ξ™–ξ˜ƒξ™†ξ™’ξ™‘ξ™—ξ™•ξ™„ξ™†ξ™—ξ™’ξ™•ξ˜‘ξ˜ƒξ˜΅ξ™ˆξ™‰ξ™ˆξ™•ξ˜ƒξ™—ξ™’ξ˜ƒξšΏξ™Šξ™˜ξ™•ξ™ˆξ˜ƒξ˜•ξ˜šξ˜‘
The DCV MAX potentiometer is factory-set at approxi-
ξ™ξ™„ξ™—ξ™ˆξ™ξ™œξ˜ƒξ˜˜ξ˜“ξ˜ˆξ˜ƒξ™’ξ™‰ξ˜ƒξ™—ξ™‹ξ™ˆξ˜ƒξ™“ξ™’ξ™—ξ™ˆξ™‘ξ™—ξ™Œξ™’ξ™ξ™ˆξ™—ξ™ˆξ™•ξ˜ƒξ™•ξ™„ξ™‘ξ™Šξ™ˆξ˜ƒξ™’ξ™•ξ˜ƒξ˜™ξ˜Ήξ˜§ξ˜¦ξ˜‘ξ˜ƒξ˜§ξ™„ξ™ξ™“-
ers will open approximately half way when CO2 rises
above setpoint. Adjust the DCV MAX potentiometer to the
ξ™„ξ™“ξ™“ξ™•ξ™’ξ™›ξ™Œξ™ξ™„ξ™—ξ™ˆξ˜ƒ ξ™–ξ™ˆξ™—ξ™—ξ™Œξ™‘ξ™Šξ˜ƒ ξ™–ξ™“ξ™ˆξ™†ξ™ŒξšΏξ™ˆξ™‡ξ˜ƒ ξ™…ξ™œξ˜ƒ ξ™—ξ™‹ξ™ˆξ˜ƒ ξ™†ξ™’ξ™‘ξ™—ξ™•ξ™’ξ™ξ™–ξ˜ƒ ξ™†ξ™’ξ™‘ξ™—ξ™•ξ™„ξ™†ξ™—ξ™’ξ™•ξ˜‘ξ˜ƒ
ξ˜΅ξ™ˆξ™‰ξ™ˆξ™•ξ˜ƒξ™—ξ™’ξ˜ƒξšΏξ™Šξ™˜ξ™•ξ™ˆξ˜ƒξ˜•ξ˜šξ˜‘
Note - DCV Max must be set higher than economizer min-
imum position setting for proper demand control ventila-
tion.

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