ACC-SVN44D-EN
11
Installation
Minimum Position Setting
To adjust the minimum position setting and check out the economizer, the power must be
connected.
Close the unit disconnect and place the zone sensor fan selector in the fan "ON" position and the
heat/cool selector in the "OFF" position. This will place the damper in the minimum ventilation
position.
To adjust the minimum position setting for the required ventilation air, turn the potentiometer (on
the ECA) clockwise to "open" (to increase the amount of ventilation) or counterclockwise to "close"
(to decrease the amount of ventilation). The damper will open to this setting each time the blower
circuit is energized.
When adjusting minimum position, the damper may move to the new setting in several small
steps. Once the damper has remained in position for 10 - 15 seconds without movement, it can be
assumed it is at the new position.
Replace the filter access panel.
The damper will close when the blower circuit is de-energized.
Dry Bulb Settings
Standard economizer dry bulb changeover is field selectable to 4 outdoor temperatures. See the
following table for potentiometer settings. The selection is made on the ECA.
Reference Enthalpy Settings
Economizer enthalpy changeover is field selectable to 4 points. See the following table for
potentiometer settings. The selection is made on the ECA.
Table 1.
Potentiometer settings
Potentiometer
Setting
Dry Bulb
Enthalpy
A
73F* (22.8C)
27 Btu/lb (63 kJ/kg)
B
70F (21.1C)
25 Btu/lb (58 kJ/kg)
C
67F (19.4C)
23 Btu/lb (53 kJ/kg)
D
63F (17.2C)
22 Btu/lb (51 kJ/kg)
* Factory Setting
Table 2.
Economizer option controls
Control Option
Enable Conditions*
Optional Sensors
Required**
Dry Bulb (standard)
See Previous Table
None
Reference Enthalpy
(ReliaTel Only)
See Previous Table
Outdoor Humidity
(BAYENTH005A)
Comparative Enthalpy
(ReliaTel Only)
Outdoor Air Enthalpy
3.0 BTU/lb. less than
Return Air Enthalpy
Outdoor Humidity
Return Humidity
Return Temperature
(BAYENTH006B)
* - Economizing is enabled when these conditions are met.
** - Conditions level will be self configured when optional sensors are con-
nected.
