175619-XIM-C-0109
Johnson Controls Unitary Products
13
ECONOMIZER/MOTORIZED DAMPER AND RAIN HOOD
The instruction for the optional economizer/motorized
damper and rain hood can be found in form 035-
07364-000. Use these instructions when field assem-
bling an economizer rain hood onto a unit. The outdoor
and return air dampers, the damper actuator, the
damper linkage, the outdoor and return air divider baf-
fles, and all the control sensors are factory mounted as
part of the “Factory installed” economizer/motorized
damper options.
POWER EXHAUST/BAROMETRIC RELIEF DAMPER AND
RAIN HOOD
The instructions for the power exhaust/barometric relief
damper and rain hood can be found in form 530.18-
N1.10V.
All of the components, including the dampers, hard-
ware, and mounting instructions are shipped in a single
package external from the unit, and must be field
assembled and installed.
Power exhaust is only available as a field installed
accessory.
ECONOMIZER AND POWER EXHAUST DAMPER
SET POINT ADJUSTMENTS AND INFORMATION
Remove the economizer access panel from the unit.
Loosen but do not remove the two panel latches.
Locate the economizer control module, where the fol-
lowing adjustments will be made.
Check that the damper blades move smoothly without
binding; carefully turn the Minimum Position Adjusting
screw (found on the damper control module) fully
clockwise and then set the thermostat indoor fan switch
to the on position and then off, or energize and de-
energize terminals “R” to “G”.
MINIMUM POSITION ADJUSTMENT
With thermostat set to indoor fan on position, or termi-
nals “R” to “G” energized, turn the Minimum Position
Adjusting screw (located on the damper control mod-
ule) counterclockwise until the desired minimum
damper position has been attained.
ENTHALPY SET POINT ADJUSTMENT
The enthalpy set point may now be set by selecting the
desired setpoint shown in the Enthalpy Setpoint Adjust-
ment Figure 4. Adjust as follows:
•
For a single enthalpy operation carefully turn the
set point adjusting screw (found on the damper
control module) to the “A”, “B”, “C” or “D” setting
corresponding to the lettered curve of the Enthalpy
Setpoint Adjustment Figure 4.
•
For a dual enthalpy operation, carefully turn the set
point adjusting screw fully clockwise past the “D”
setting.
TABLE 3: ELECTRIC HEATER SUPPLY AIRFLOW LIMITATIONS
7
10
15
20
30
M
3
/S
0.47
0.57
0.57
0.61
-
CFM
1100
1200
1200
1300
-
M
3
/S
0.61
0.61
0.61
0.61
-
CFM
1300
1300
1300
1300
-
M
3
/S
0.75
0.75
0.75
0.75
0.75
CFM
1600
1600
1600
1600
1600
HEATER SIZE NOMINAL KW
MINIMUM
SUPPLY AIR
VOLTAGE
UNIT MODEL SIZE
NOMINAL TONS
3
4
5
380/415-3-50
380/415-3-50
380/415-3-50
Extreme care must be exercised in turning all
setpoint, maximum, and minimum damper
positioning adjustment screws to prevent twist-
ing them off.
