Lennox Core Unit Controller Setup Manual page 72

Control
Parameter Screen Name
No
MGV PID D
398
CONST
399 MGV SP HI CAB
400 MGV DB HI CAB
POWER
401
EXHAUST MODE
EXH FN LOW
402
SPD CYCL
EXH FN STG1
403
SPEED
EXH FN STG2
404
SPEED
EXH FN SMK
405
PRES SP
EXH FN MIN
406
SPEED
EXH FN MAX
407
SPEED
EXH FN
408
MANUAL RESET
EXH FN P
409
CONTSTANT
EXH FN I
410
CONSTANT
EXG FN D
411
CONSTANT
EN FIXED BLWR
412
SPD
HI CL REHEAT
414
TMOUT
DAMP BKLASH
415
ADJ
Table 12. CORE Control System Unit Parameters
Parameter Short
Description
Min.
MGV PID loop
derivative 0
constant
Shift to high
speed CAB when
0
MGV output rises
above this value.
Deadband for
shifting down to 2
low speed CAB
Power Exhaust
N/A
Mode
Low Speed
Cycling.
Speed for
stage 1 when
using a VFD
0
for controlling
exhaust fan in
staged mode.
Speed for
stage 2 when
using a VFD
0
for controlling
exhaust fan in
staged mode.
Exhaust Fan
set point for PID -0.50
control
Exhaust Fan PID
0
loop min speed
Exhaust Fan PID
0
loop max speed
Exhaust Fan PID
loop manual reset 0
value.
Exhaust Fan PID
loop proportional 0
constant
Exhaust Fan
PID loop integral 0
constant
Exhaust Fan PID
loop derivative 0
constant
Enable Fixed
0
Blower Speed
High Cool Reheat
0
Time Out
Damper Backlash
0
Adjustment
Control Value
Default Max.
0 127
65 100
17 100
Blower On N/A Options
0 1 Options
50 100
100 100
-0.50 0.50
50 100
100 100
100 100
20 127
64 127
0 127
0 2 Options
0 30
25 40
72
Units Description
Counts
%
%
Exhaust Fan Enable Options:
• Blower On
• Always
• Occupied
• External Enable
• 0 = Disabled
• 1 - Enables Low Speed Cycling.
%
%
in w.c.
%
%
%
Counts
Counts
Counts
This Parameter is applicable to 'T' type
Blower only.
• 0 - Auto
• 1 - Always run the blower at low
speed
• 2 - Always run the blower at high
speed
Sec Reheat run-time on call for high cooling.
Damper overshoot percentage when
moving to a more closed position. The
% damper will move this percentage beyond
the target position, then reverse and
move to the final target position.