Economizer Controller
ACC-SVN203C-EN 15
STATUS
EXH1 OUT(c) OFF ON/OFF N/A
O u t p u t o f E X H 1 t e rm i n a l . D i s p l a y s O N w h e n d a m p e r
pos
ition re
aches programmed percentage setpoint.
ON = 24 Vac Output; OFF = No Output
EXH2 OUT OFF ON/OFF N/A EXH2 OUT is not available
ERV OFF ON/OFF N/A ERV is not available
MECH COOL ON(c) 0 0, 1, or 2 N/A
Displays number of mechanical cooling stages that
are active
FAN SPEED(c) N/A LOW or HIGH N/A Displays speed of fan on a 2-speed fan unit
W (HEAT IN)(c) N/A ON/OFF N/A Displays status of heat on a 2-speed fan unit.
SETPOINTS
MAT SET(c) 53ºF
38 to 70°F;
increment by 1
53ºF
The economizer will modulate the OA damper to
main
tain the mixed air temperature at the setpoint
LOW T LOCK(c) 32ºF
-45 to 80°F;
increment by 1
32ºF
Setpoint determines outdoor temperature when the
me
chanical c
ooling cannot be turned on. Commonly
referred to as the Compressor lockout. At or below
the setpoint the Y1-O will not be energized on the
controller
DRYBLB SET(c) 63ºF
48 to 80°F;
increment by 1
67ºF
Setpoint determines where
the economizer will
assume outdoor air temperature is good for free
cooling; e.g.; at 63ºF setpoint unit will economizer
at 62ºF and below and not economize at 64ºF and
above. There is a a 2ºF deadband
ENTH CURVE(c) ES3
ES1, ES2, ES3,
ES4, or ES5
ES3
Enthalpy boundary “curves” for economizing using
sin
gle
enthalpy
See Table for description of enthalpy curves
DCV SET(c) 1100ppm
500 to 2000
ppm
increment by
100
1100ppm
Displays ONLY if a CO
2
sensor is connected.
Setpoint for Demand Control Ventilation of space
Above the setpoint, the OA dampers will modulate
open to bring in additional OA to maintain a space
ppm level below the setpoint
MIN POS(c) 2.8 V 2 to 10 Vdc
2.8V/3.2V LO/2.8V
HI
Displays ONLY if a CO
2
sensor is NOT connected.
With 2-speed fan units MIN POS L (low speed fan)
and MIN POS H (high speed fan) settings are
required. Default for MIN POS L is 3.2V and MIN POS
H is 2.8V
VENTMAX(c) 2.8 V
2 to 10 Vdc
or
100 to 9990 cfm
increment by 10
2.8V/3.2V LO/2.8V
HI
Displays only if a CO
2
sensor is connected. Used for
Vbz (ventilation max cfm) setpoint. VENTMAX is the
same setting as MIN POS would be if you did not
have the CO
2
sensor. Displays 2 to 10 V if <3
sensors (RA,OA and MA). In DCV CAL ENABLE AUTO
mode dampers controlled by CFM With 2-speed fan
units VENTMAX L (low speed fan) and VENTMAX H
(high speed fan) settings are required. Default for
VENTMAX L is 3.2V and VENTMAX H is 2.8V
VENTMIN(c) 2.25 V
2 to 10 Vdc
or
100 to 9990 cfm
increment by 10
2.25V/2.5V LO/
2.25V HI
Displays only if CO
2
sensor is connected. Used for
Va (ventilation min cfm) setpoint. This is the
ventilation for less than maximum occupancy of the
space. Displays 2 to 10 V if <3 sensors (RA,OA and
MA). Va is only set if DCV is used
In DCV CAL ENABLE AUTO mode dampers
cont
rolled by CFM With 2-speed fan units VENTMIN
L (low speed fan) and VENTMIN H (high speed fan)
settings are required. Default for VENTMIN L is 2.5V
and VENTMIN H is 2.25V
ERV OAT SP 32ºF
0 to 50°F;
increment by 1
N/A ERV OAT SP is not available
EXH1 SET(c) 50%
1 to 100%;
increment by 1
50%/65% LO/50%
HI
Setpoint for OA damper position when exhaust fan
1
is po
wered by the economizer
With 2-speed fan units Exh1 L (low speed fan) and
Exh1 H (high sp
eed fan) settings are required
Default for Exh1 L is 65% and Exh1 H is 50%
Table 4. Controller menu structure (continued)
Menu Parameter
Parameter
Default
Value
Parameter
Range and
Increment
(a)
Parameter
Recommended
Value
(b)
Notes
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