60
Table 12. CORE Control System Unit Parameters
Control
Parameter
No
Screen Name
Parameter Short
Description
Control Value
Units
Description
Min.
Default
Max.
163
ECN FRCL ENTH
OFFST
Economizer Free
Cooling Enthalpy
Offset
1
1
5
mA
Economizer Free Cooling Enthalpy Offset
164
ECONOMIZER
PROFILE
Economizer
Profile
0
2
3
Option
These are the operating profile options
for the economizer damper during free
cooling when any compressor is on and
can be selected as follows:
•
Option 0:
Damper continues to
modulate while compressors are on,
but the effect of mechanical cooling
may force the damper closed to its
minimum position. After compressor
starts, the free cooling setpoint is
lowered to a fixed temperature of
45°F.
•
Option 1:
Damper opens to its
max open position (Parameter 131 -
FREE CL MAX DAMPER) when any
compressors start.
NOTE:
When using Option 1 and after
the compressor is stopped,
the M3 will resume damper
modulation.
•
Option 2:
Damper continues to
modulate while compressors are on,
but the effect of mechanical cooling
may force the damper closed to its
minimum position. This is the factory
default setting.
>
Holds off compressor on
Y2 call until damper has
modulated to maximum
position (Parameter 131 -
FREE CL MAX DAMPER) for
three minutes.
>
After three minutes,
compressor starts and the
free cooling setpoint is
lowered to 45°F. Damper is
not locked at maximum open
while compressor is on, but
modulates to maintain 45°F
discharge air temperature.
>
When Y2 is satisfied,
compressor goes off and free
cooling setpoint is restored to
55°F (Parameter 159 - FREE
COOL SUPPLY SP).
•
Option 3:
Same as Option 2, but
with a 10 minute delay instead of a
three minute delay.
System 2 Parameters
165
FAH STAGE
DIFFER
Fresh Air Heating
Stage Differential
0
2
20
°F
•
Fresh Air Heating stage differential.
•
0 value for first stage heating only
for Fresh Air Heating.
166
FAH REHEAT
OAT SP
Fresh Air Heating
Control Reheat
Outdoor Air
Temperature Set
Point
20
45
60
°F
Outdoor air temperature set point that
enables fresh air heating for reheat
demand and opens damper to Parameter
167 when outdoor air is less than set
point.
167
FAH REHEAT
DAMPER
Fresh Air Heating
Control Reheat
Damper Position
5
40
100
%
Fresh air damper position during Fresh
Air Heating reheat operation.
168
FAH REHEAT SP Fresh Air Heat
Control Set Point
40
40
70
°F
Fresh Air Heating Reheat set point.
