Lennox Core Unit Controller Setup Manual page 54

Control
Parameter Screen Name
No
CL STG 3
102
STGUP TIME
CL STG 4
103
STGUP TIME
CL STAGE
104
DOWN TIME
105 DEHUMID MODE
DEHUMID
106
SETPOINT
DEHUMID
107
DEADBAND
FREE LO AMB
108
LCKT SP
Table 12. CORE Control System Unit Parameters
Parameter Short
Description
Min.
Maximum Stage
2 Cooling Time
0
Before Call for
Stage 3 Cooling
Maximum Stage
3 Cooling Time
0
Before Call for
Stage 4 Cooling
Cooling Stage
0
Down Time
Dehumidification
0
Mode
Dehumidification
0
Set Point
Dehumidification
Dead Band 1
(neutral zone)
Free Cooling Low
Ambient Lockout 45
Set Point
Control Value
Default Max.
912 3600 Seconds
912 3600 Seconds
912 3600 Seconds
0 - No
Humiditrol is
installed
6 - All Others 7
(Check Unit
Parameter
Label)
Default may
be altered at 99
factory test.
3 10
55 80
54
Units Description
• Stage 3 stage up timer. The
maximum time that cooling stage 2
runs before calling cooling stage 3.
• Used in room sensor applications.
• Disabled if set to 0.
• Stage 4 stage up timer. The
maximum time that cooling stage 3
runs before calling cooling stage 4.
• Used in room sensor applications.
• Disabled if set to 0
• Time delay before a lower stage
turns off following a higher stage
termination.
• Used in room sensor applications.
Dehumidification Mode
• 0 = No reheat.
• 1 = Supermarket reheat using De-
Humidistat (wired thermostat mode
only)
• 2 = Supermarket reheat using
relative humidity sensor.
• 3 = Humiditrol reheat. Conditions:
Blower must be energized, Must
be occupied, At least one previous
cooling demand.
Option
• 4 = Relative Humidity measurement
/ display. No Supermarket or
Humiditrol reheat.
• 5 = Humiditrol reheat. Conditions: At
least one previous cooling demand.
• 6 = Humiditrol reheat. Conditions:
Blower must be energized, Must be
occupied.
7 = Humiditrol reheat. Conditions:
•
None
• Percent relative humidity where
supermarket or Humiditrol reheat
demand is energized. Used of
dehumid mode option 2, 3, 5, 6 or
7. Dehumidification is de-energized
at set point – dead-band (Parameter
107)).
% RH
• Digital Input 4 only. Energized input
signal calls for dehumidification
demand. L Connection Network
Relative Humidity set point will
override this set point. (Such as from
NCP).
Used of dehumidification Parameter 105,
option 2, 3, 5, 6 or 7. Dehumidification is:
• ON when relative humidity is equal
to or greater than Parameter 106.
% RH
• OFF when Relative Humidity is
less than Parameter 106 minus
Parameter 107.
When outdoor air is suitable for free
cooling and an economizer is present, the
°F
compressor will not run when ambient is
below this value.