Control Location - Honeywell Home DB7110U Instructions D'installation

DB7110U UNIVERSAL HEAT PUMP DEFROST CONTROLLER
WARNING
Electrical Shock Hazard. Can cause severe
injury, death or property damage.
Disconnect power supply before beginning
installation to prevent electrical shock or
equipment damage. More than one disconnect
may be involved.

Control Location

1. Before removing the old control, make note of
the wire connections to ensure the wires will be
connected to the correct terminals of the
DB7110U.
2. Mount DB7110U inside the junction box on the
outdoor unit using the two included self-drilling
sheet metal screws.
3. Use the control as a template to drill new mount-
ing holes if necessary.
4. If the mounting tabs interfere with other compo-
nents in the junction box, break/cut off the
unused mounting tabs prior to tightening the
mounting screws.
Coil Sensor Location
Fig. 2. Coil Sensor.
1. The outdoor coil sensor must be used. Without
the coil sensor, the DB7110U cannot determine
when to defrost. The coil sensor included with
the DB7110U replaces the existing defrost ther-
mostat or coil sensor installed on the unit.
2. Place the sensor on the coil where the OEM sen-
sor/thermostat was located. If replacing a
defrost thermostat, note the original settings for
proper adjustment of the termination and
enable temperatures on the DB7110U. They are
often marked with their open and close points. A
thermostat marked L60-25F for example would
correspond to a Termination Temperature of
60degF and an Enable Temperature of 35degF
(60deg-25deg).
3. If the location of the OEM sensor/thermostat is
inaccessible or difficult to access, place the new
coil sensor on the coil loop nearest the expan-
sion valve where refrigerant is entering the coil
during the heating mode. This location gives the
largest temperature difference between the air.
34-00032EF—01
4. Ensure the coil sensor is clamped tightly to the
coil. It may be desirable to add insulation to the
sensor to yield more accurate readings,
although this is generally not needed.
Fig. 3. Coil Sensor Mounting.
OUTDOOR AIR SENSOR
LOCATION (DEMAND
DEFROST ONLY)
M37663
1. The outdoor air sensor is for demand defrost
systems only. Using the outdoor air sensor will
enable the DB7110U to implement a more
advanced defrost algorithm that determines to
defrost based on the relationship between coil
and air temperatures. Without the air sensor, the
DB7110U defrosts when the coil temperature is
below the Enable Temperature for the Defrost
Cycle Time. It is advisable to use the air sensor if
possible as it may reduce the number of unnec-
essary defrosts that are common among defrost
timers.
2. Mount the air sensor such that the capsule is
hanging in air near the outdoor coil.
3. Do not locate the air sensor too close to the coil
that sensor readings are influenced by it.
4. Do not mount the air sensor in direct sunlight.
5. The air sensor capsule should not be in contact
with metal or some other material that may
change its readings.
2
SENSOR
Fig. 4. Air Sensor.
M37638
M37664