Honeywell TROL-A-TEMP AOBD Series User Manual

AUTOMATIC OPPOSED BLADE DAMPERS (AOBD)
11 68-0246
SERVICE
Checking Damper Blades
Occasionall
y
damper blades stick while openin
g
or closin
g
.
The problem ma
y
be caused b
y
a worn motor switch or
bindin
g
damper blades. To locate the problem:
1.
Remove the electric actuator enclosure, if necessar
y
.
2.
Separate the crank arm from the motor shaft usin
g
a 1-
16 Allen wrench.
3.
Usin
g
y
our hand, open and close the damper blades
several times b
y
pushin
g
and pullin
g
the crank shaft:
a. If linka
g
e and damper blades move freel
y
, the
y
are
workin
g
correctl
y
.
b. If linka
g
e and damper blades re
q
uire effort to open
or close, replace the damper and repeat step 2.
4.
If the damper blades still re
q
uire considerable effort to
open or close, check that the damper is sized correctl
y
and that there is no pressure on the damper blades. If
the damper is not sized correctl
y
, replace the old
damper with a correctl
y
-sized damper.
5.
Attach the crank arm to the motor drive shaft.
6.
If the damper blades continue to stick while openin
g
or
closin
g
, refer to the Installation Instruction to ensure the
mountin
g
screws are installed correctl
y
.
7.
Be sure the damper blades close full
y
b
y
shortin
g
termi-
nals 5 and 6. If there is a
g
ap between damper blades:
a. Loosen the crank arm from the motor drive shaft
usin
g
a 1-16 Allen wrench.
b. Manuall
y
close the
g
ap between the damper blades.
c. Ti
g
hten the crank arm to the motor drive shaft usin
g
a 1-16 Allen wrench.
Checking Electric Actuator (See Fig. 16)
1.
Remove wires from the damper terminals.
2.
Connect 24 Vac to electric actuator terminals 1 and 2.
3.
Ensure the electric actuator operates correctl
y
:
a. Remove wires from terminals 4 and 6.
b. Short terminals 4 and 5 to open the damper blades.
c. Short terminals 5 and 6 to close the damper blades.
(
1
)
If the dampers open and close as indicated, the
s
y
stem is operational.
(
2
)
If the dampers do not operate, as indicated,
replace the electric actuator and repeat steps 1
and 2.
4.
Ensure the end-switch operates correctl
y
:
a. Connect a 24 Vac test li
g
ht between terminals 1 and
3.
b. Short terminals 4 and 5:
(
1
)
When the damper blades are full
y
open, the
end-switch en
g
a
g
es, the 24 Vac test li
g
ht turns
on, and the electric actuator turns off.
c. Short terminals 5 and 6:
(
1
)
When the damper blades are full
y
closed, the
end-switch en
g
a
g
es, the 24 Vac li
g
ht turns off,
and the electric actuator turns off.
5.
If the motor and end-switches do not operate, as indi-
cated, replace the electric actuator and repeat steps 1
throu
g
h 4.
6.
Replace the electric actuator enclosure.
Fig. 16. Checking the electric actuator.
Replacing Electric Actuator
IMPORTANT
Electric actuator is shipped in the open damper posi-
tion.
1.
Usin
g
a 1-16 Allen wrench, loosen the crank arm set-
screw that connects the crank arm to the motor drive
shaft.
2.
Remove the crank arm from the motor drive shaft.
3.
Remove the two screws from the crank arm side of the
actuator box.
4.
Remove the electric actuator from the actuator box.
5.
Install the new electric actuator into the actuator box.
6.
Ti
g
hten the two screws into the crank arm side of the
actuator box.
7.
Attach the crank arm to the motor drive shaft.
8.
Ti
g
hten the crank arm set screw.
4
56
z
1
2
3
x
L1 (HOT)
L2
24V
24V
TEST
LIGHT
SHORT TERMINALS 4 AND 5 TO OPEN DAMPER BLADES.
SHORT TERMINALS 5 AND 6 TO CLOSE DAMPER BLADES.
24V TEST LIGHT TURNS ON WHEN DAMPER BLADES OPEN
AND TURNS OFF WHEN DAMPER BLADES CLOSE.
M2278A
1
2
3
1
2
3

Honeywell TROL-A-TEMP AOBD Series Specifications

General

Brand	Honeywell
Model	TROL-A-TEMP AOBD Series
Category	Stud Sensor
Language	English