S-61B Checking Heater Fuse Link; (Optional Electric Heaters); S-16G Checking Emerson Ultratech; Ecm Motors - Daikin DX17VSS B Series Service Instructions Manual

SERVICING
S-61B CHECKING HEATER FUSE LINK (OP-
TIONAL ELECTRIC HEATERS)
Each individual heater element is protected with a one time
fuse link which is connected in series with the element.
the fuse link will open at approximately 333°f.
Disconnect ALL power before servicing.
1. Remove heater element assembly so as to expose
fuse link.
2. Using an ohmmeter, test across the fuse link for
continuity -no reading indicates the link is open.
Replace as necessary.
NOTE: the link is designed to open at approximately 333°f.
do not WiRE ARoUnd - determine reason for failure.

S-16G CHECKING EMERSON ULTRATECH™

ECM MOTORS

DESCRIPTION
the indoor unit utilize an Emerson, 4-wire variable speed
ECM blower motor. the ECM blower motor provides
constant CfM.
the motor is a serially communicating variable speed mo-
tor. only four wires are required to control the motor: +vdc,
Common, Receive, and transmit
the +vdc and Common wires provide power to the motor's
low voltage control circuits.
General Checks/Considerations
1. Check power supply to the indoor unit. Ensure
power supply is within the range specified on rating
plate. See section S-1.
2. Check motor power harness. Ensure wires are
continuous and make good contact when seated in
the connectors. Repair or replace as needed.
3. Check motor control harness. Ensure wires are
continuous and make good contact when seated in
the connectors. Repair or replace as needed.
4. Check thermostat and thermostat wiring. Ensure
thermostat is providing proper cooling/heating/
continuous fan demands. Repair or replace as
needed.
5. Check blower wheel. Confirm wheel is properly
seated on motor shaft. Set screw must be on shaft
flat and torqued to 165 in-lbs minimum. Confirm
wheel has no broken or loose blades. Repair or
replace as needed.
6. Ensure motor and wheel turn freely. Check for
interference between wheel and housing or wheel
and motor. Repair or replace as needed.
7. Check housing for cracks and/or corrosion. Repair
or replace as needed.
8. Check motor mounting bracket. Ensure mounting
bracket is tightly secured to the housing. Ensure
bracket is not cracked or broken.
Emerson UltraCheck-EZ™ Diagnostic Tool
the Emerson UltraCheck-EZ
to diagnose the ECM motor.
HIGH VOLTAGE!
Disconnect ALL power before servicing
or installing. Multiple power sources
may be present. Failure to do so may
cause property damage, personal injury
or death.
to use the diagnostic tool, perform the following steps:
1. disconnect power to the indoor unit.
2. disconnect the 4-circuit control harness from the
motor.
3. Plug the 4-circuit connector from the diagnostic tool
into the motor control connector.
4. Connect one alligator clip from the diagnostic tool to
a ground source.
5. Connect the other alligator clip to a 24vAC source.
NOTE: the alligator clips are not polarized.
NOTE: the UltraCheck-EZ
a nonreplaceable fuse. Connecting the tool to a source oth-
er than 24vAC could damage the tool and cause the fuse to
open. doing so will render the diagnostic tool inoperable.
6. turn on power to the indoor unit.
Line Voltage now present.
7. depress the orange power button on the diagnostic
tool to send a run signal to the motor. Allow up to 5
seconds for the motor to start.
NOTE: if the orange power button does not illuminate when
depressed, the tool either has an open fuse or is not properly
connected to a 24vAC source.
8. the green LEd on the diagnostic tool will blink
indicating communications between the tool and motor.
See table below for indications of tool indicators and
motor actions. Replace or repair as needed.
Power Green Motor
Button LED Action
off off not Rotating
on Blinking Rotating
on off Rotating
on Blinking not Rotating Check motor (see Motor Checks on page 23).
on off not Rotating
tM
diagnostic tool may be used
tM diagnostic tool is equipped with
Indication(s)
Confirm 24VAC to UltraCheck-
tM
EZ tool. If 24VAC is confirmed,
diagnostic tool is inoperable.
Motor and control/end bell are
functioning properly.
Replace motor control/end bell.
Replace motor control/end bell; verify
motor (see Motor Checks on page 23).
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