Lennox Core Unit Controller

72
Table 12. CORE Control System Unit Parameters
Control
Parameter
No
Screen Name
Parameter Short
Description
Control Value
Units Description
Min. Default Max.
398
MGV PID D
CONST
MGV PID loop
derivative
constant
0 0 127 Counts
399 MGV SP HI CAB
Shift to high
speed CAB when
MGV output rises
above this value.
0 65 100 %
400 MGV DB HI CAB
Deadband for
shifting down to
low speed CAB
2 17 100 %
401
POWER
EXHAUST MODE
Power Exhaust
Mode
N/A Blower On N/A Options
Exhaust Fan Enable Options:
• Blower On
• Always
• Occupied
• External Enable
402
EXH FN LOW
SPD CYCL
Low Speed
Cycling.
0 1 Options
• 0 = Disabled
• 1 - Enables Low Speed Cycling.
403
EXH FN STG1
SPEED
Speed for
stage 1 when
using a VFD
for controlling
exhaust fan in
staged mode.
0 50 100 %
404
EXH FN STG2
SPEED
Speed for
stage 2 when
using a VFD
for controlling
exhaust fan in
staged mode.
0 100 100 %
405
EXH FN SMK
PRES SP
Exhaust Fan
set point for PID
control
-0.50 -0.50 0.50 in w.c.
406
EXH FN MIN
SPEED
Exhaust Fan PID
loop min speed
0 50 100 %
407
EXH FN MAX
SPEED
Exhaust Fan PID
loop max speed
0 100 100 %
408
EXH FN
MANUAL RESET
Exhaust Fan PID
loop manual reset
value.
0 100 100 %
409
EXH FN P
CONTSTANT
Exhaust Fan PID
loop proportional
constant
0 20 127 Counts
410
EXH FN I
CONSTANT
Exhaust Fan
PID loop integral
constant
0 64 127 Counts
411
EXG FN D
CONSTANT
Exhaust Fan PID
loop derivative
constant
0 0 127 Counts
412
EN FIXED BLWR
SPD
Enable Fixed
Blower Speed
0 0 2 Options
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
414
HI CL REHEAT
TMOUT
High Cool Reheat
Time Out
0 0 30 Sec Reheat run-time on call for high cooling.
415
DAMP BKLASH
ADJ
Damper Backlash
Adjustment
0 25 40 %
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naltargetposition.