Dcv Maximum Position Adjustment - Honeywell Design and Application Technical Reference Manual

Section 9 - W7212, W7213 and W7214 Economizer Modules
All other inputs are same as other logic
modules, for space consideration the enthalpy
sensor terminals were moved to left side of
control.
Same input for TR-TR1 for 24 Vac power to
logic module and output to mechanical
cooling.
Output for 2-10 Vdc and 24 Vac power to
actuator is on the right side of the unit and
power exhaust fan output.
EXHAUST FAN CONTACTS
The exhaust setpoint determines when the
exhaust fan runs based on damper position.
Full CCW is fully closed damper position and
Full CW is fully open damper position.
When the EF and EF1 contacts are made after
the 60 ±30 sec. delay, the EXH LED will
illuminate.
Damper minimum position and maximum
position are the positions of the damper for
ventilation for building contaminants and
people occupancy. See section 1 for
explanation of DCV and determination of
damper settings.
63-8594-02 Honeywell Economizers
POWERED WHEN
OCCUPIED
LED LIGHTS WHEN N1
ARE CLOSED
MINIMUM DAMPER P1
POSITION SETTING
T1
MAXIMUM DCV
SETPOINT
LED LIGHTS WHEN
DCV INPUT IS
AQ1
ABOVE SETPOINT
SO+
DCV SETPOINT
SR+
LED LIGHTS WHEN
OUTDOOR AIR IS
SUITABLE FOR
FREE COOLING
ENTHALPY
CHANGEOVER SETPOINT
The exhaust setpoint determines when the
exhaust fan runs based on damper position.
When the exhaust fan call is made, the
module provides a 60 ±30 second delay
before exhaust fan activation. This delay
allows the damper to reach the appropriate
position to avoid unnecessary fan overload.
EF and EF1 are 24V dry contacts only. An
external line voltage contactor is required to
operate the exhaust fan.
When the exhaust fan is deactivated the EF
and EF1 relay opens immediately.
EXH
TR1
TR
N
Set
EXH
24
24
P
VAC VAC
HOT COM
Min
Pos
+ –
T
Open
IAQ
1 2
Max
IAQ
AQ
5
IAQ
MIN
3 4
SO
Free
SR
Cool
EF
EF1
B C
A D
DCV Maximum Position
Adjustment
1. Disconnect mixed air sensor from
terminals T and T1 and short terminals T
and T1.
2. Connect a jumper between terminals AQ
and SO+.
3. Connect 24 Vac across terminals TR and
TR1.
4. Adjust the potentiometer on the face of
the device with a screwdriver for desired
maximum position.
5. If all minimum and maximum position
adjustments are complete, remove the
T-T1 jumper and reconnect the mixed air
sensor.
84
24 VAC INPUT
24 VAC TO
ACTUATOR
2-10 VDC TO
ACTUATOR
OUT TO COOL 1
OUT TO COOL 2
EXHAUST
FAN OUTPUT
M23969B