Honeywell M896 Installation Instructions Manual
M896
69-1089B-1
Damper Actuator
INSTALLATION INSTRUCTIONS
APPLICA TION
The M896 Damper Actuator is a 24 Vac motor with an
external shaft for coupling. Powered rotation is counterclockwise (ccw), with a maximum rotation of 110°. The
actuator is designed as a replacement actuator for the
D892 and D896 Automatic Vent Dampers or as the
original actuator on similar OEM dampers. Maximum OEM
damper operating torque cannot exceed ten in.-oz.
OPERATION
On a call for heat, the actuator automatically opens the
damper and the furnace or boiler begins its ignition cycle.
When the heating cycle ends, the burner turns off and the
actuator automatically closes the damper. Heating system
efficiency is increased because the closed damper
reduces the loss of residual appliance heat and heated
room air through the draft diverter.
INST ALLATION
When Installing this Product…
1. Read these instructions carefully. Failure to follow
them could cause a hazardous condition.
2. Check the ratings given in the instructions and on
the product to make sure the product is suitable for
your application.
3. Installer must be a trained experienced service
technician.
4. Install the M896 Damper Actuator as a replacement
only on AGA/CGA-approved damper systems.
5. After installation is complete, check out actuator
operation as provided in the Checkout section.
W ARNING
Severe illness or death possible.
Prevent dangerous buildup of
carbon monoxide.
Be sure damper used with M896 has a return
spring that opens the damper if the coupler fails.
CA UTION
Electrical shock or equipment
damage possible.
1. Disconnect power supply.
2. Do not negate the action of any existing safety
or operational control.
3. Make sure that the damper return spring is
operational prior to installing the actuator.
4. Label all wires prior to disconnecting when
servicing controls. Wiring errors can cause
improper and dangerous operation.
To Install the M896 Damper Actuator:
1. Remove the existing actuator.
2. Make sure the damper return spring is operational.
(The damper return spring must open the damper
when the actuator coupling is removed to prevent a
dangerous buildup of carbon monoxide.)
3. Locate the arrow coupler and keeper clip
(see Fig. 1).
ARROW
KEEPER
CLIP
4. Slip keeper clip over arrow coupler as shown in Fig.
5. Install the arrow coupler in the slot on the damper
6. Align the slot on the actuator shaft with the arrow
7. Attach the actuator to the damper bracket using the
8. Remove the keeper clip from the arrow coupler.
9. Connect the Molex plug to the M896 Harness Cable
COUPLER
AB
DAMPER
SHAFT
Fig. 1. Installing arrow coupler on damper
1. This compresses the arrow coupler.
shaft with the arrow pointing up.
coupler and attach the actuator to the damper.
See Fig. 2. (If the actuator output shaft is not
properly aligned with the arrow coupler, manually
turn the motor knob with a screwdriver to align the
actuator shaft.)
screws removed in step 1.
Connector.
shaft using keeper clip.
M3949
Copyright © 1997 Honeywell Inc. • All Rights Reserved
X-XX UL
M896 DAMPER ACTUATOR
Other wiring connections are necessary. Follow the
furnace or boiler manufacturer wiring instructions, or
refer to Fig. 3 through 5.
DAMPER BRACKET
REMOVED FOR CLARITY
Fig. 2. Installing M896 Damper Actuator on damper.
M3947
M896
SERVICE
SWITCH
NORM
SERV
1
S3 SWITCH
1
USE STANDARD SCREWDRIVER TO MANUALLY OPEN AND
CLOSE VENT DAMPER. PLACE SCREWDRIVER IN SLOTTED
KNOB AND ROTATE COUNTERCLOCKWISE UNTIL
BOTH LEDS TURN ON.
RELAY 1K
Fig 3. M896 with cover removed.
IGNITION GAS
PWR LED
CALL FOR
HEAT LED
HARNESS
CABLE
CONNECTOR
M11367
S8600F, H, M; S8610F,H
1
GND
MV MV/PV PV
POWER SUPPLY. PROVIDE DISCONNECT MEANS
1
AND OVERLOAD PROTECTION AS REQUIRED.
REMOVE PLUG ONLY IF USING VENT DAMPER. FUSE
2
BLOWS ON STARTUP WHEN PLUG IS REMOVED;
THEN MODULE OPERATES ONLY WHEN VENT
DAMPER IS CONNECTED.
(BURNER)
24V
GND
24V SPARK
2
VENT
DAMPER
PLUG
WIRING
HARNESS
SENSETH-W
M896/D896
VENT
DAMPER
M11369
Fig. 4. Wiring diagram for M896 (D896) connection to L8148E1166 using wiring harness with two Molex plugs.
69-1089B–1
2
M896/D896
LED 2
4
N.O.
S2
C
K1
C
N.O.
S3
K1
DAMPER OPEN
DAMPER CLOSED
MOTOR
NORMAL
S4
5
SERVICE
N.O.
N.C.
S1
C
N.C.
LED 1
3
POLARIZED 4-PRONG MALE MOLEX PLUG AND
4-PRONG FEMALE MATING PLUG ON CABLE
SWITCHES AS SHOWN: S1,S2,S3
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
AFTER M896/D896 VENT DAMPER IS PLUGGED TO L8148E1166, FUSE
2
BLOWS WHEN THERMOSTAT FIRST CLOSES. AFTER FUSE BLOWS,
L8148E1166 OPERATES ONLY WHEN VENT DAMPER IS CONNECTED.
3
LED 1 LIGHTS WHEN DAMPER IS OPEN.
4
LED 2 LIGHTS WITH CALL FOR HEAT.
5
SERVICE SWITCH. THE NORMAL SWITCH SETTING IS NORM. IF THE
SWITCH IS MOVED TO THE SERV POSITION, THE DAMPER REMAINS OPEN.
R1, R2, R3
250 OHMS
N.C.
4
2
1
3
WIRING
HARNESS
24 Vac
THERMOSTAT
4
2
3
FUSE
2
5
1
6-PRONG FEMALE MOLEX
RECEPTACLE IN L8148E
AND 5-PRONG MALE
MOLEX PLUG ON CABLE
M896 DAMPER ACTUATOR
L8148E1166
TW
1K
B1
Z
24V GND
24V
TV
C2
C1
1K1
L2
L1B2
CIRCULATOR
L1
L2
(HOT)
1
M11368
Fig. 5. Wiring diagram for M896 (D896) connection to S8600/S8610 using wiring harness with two Molex plugs.
SETTINGS
The service switch has both a normal (NORM ) and a
service (SERV) mode.
NORM — M896 opens on a call for heat and closes at
the end of the heating cycle.
SERV — M896 electrically opens after the thermostat
has a call for heat and remains open.
CHECKOUT
Heating
1. Turn off the power supply.
2. If using a thermostat, set the heat anticipator to
0.13A.
3. Set the thermostat or controller to 10°F (6°C) above
the room temperature to call for heat.
4. Check that the M896 Damper Actuator opens the
damper before the gas valve opens and the pilot or
main burner ignites. See Fig. 6.
NOTE: If a boiler gas control is sequenced by the
Aquastat® Controller, be sure that the
actuator opens the damper prior to the
opening of the gas control.
5. Turn the thermostat or controller 10°F (6°C) below
the room temperature. Check that the M896 Damper
Actuator closes the damper.
6. Cycle the heating system three times using the
thermostat or controller to assure that the system is
operating safely.
3
69-1089B–1
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