GSX14 Service Manual

SERVICING
110
7. Locate the 3-circuit connector in the control/end bell.
Using an ohmmeter, check the resistance between each
terminal in the connector. If the resistance is 100kW or
greater, the control/end bell is functioning properly. Re-
place the control/end bell if the resistance is lower than
100kW.
8. Reassemble motor and control/end bell in reverse of
disassembly. Replace blower assembly into air handler
or modular blower.
Motor Checks
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.
1. Disconnect power to air handler or modular blower.
NOTE: Motor contains capacitors that can hold a charge for
several minutes after disconnecting power. Wait 5 minutes
after removing power to allow capacitors to discharge.
2. Disassemble motor as described in steps 2 through 4
above.
3. Locate the 3-circuit harness from the motor. Using an
ohmmeter, measure the resistance between each motor
phase winding. The resistance levels should be equal.
Replace the motor if the resistance levels are unequal,
open circuited or short circuited.
4. Measure the resistance between each motor phase
winding and the motor shell. Replace the motor if any
phase winding is short circuited to the motor shell.
5. Reassemble motor and control/end bell in reverse of
disassembly. Replace blower assembly into air handler
or modular blower.
S-16H ECM CFM ADJUSTMENTS AVPTC/MBVC
This section references the operation characteristics of the
MBVC models. The MBVC models utilize an integrated air
handler control. The air handler control provides ECM
blower motor control and includes all dipswitches neces-
sary to set up the cooling, heat pump and electric airflow
characteristics.
The control has three banks of dipswitches: a bank for
cooling airflow and trim adjustment, a bank for selecting one
of (4) enhancement profiles and enabling dehumidification,
and a bank for selecting the installed electric heater kit size.
Adjustments are made by selecting the appropriate ON/
OFF combinations of the dipswitches. The dipswitches
along with their functions are shown in the figures below.
Cooling Airflow Dipswitches - Used to set the desired
cooling airflow
Cooling Airflow Speed Tap (* indicates factory setting)
Tap A
1
OFF
ON
2
Tap B
1
OFF
ON
2
Tap C
1
OFF
ON
2
Tap D*
1
OFF ON
2
Airflow Adjust Dipswitches - Used to adjust the airflow +/
-10%
Airflow Adjust Taps (* indicates factory sett ing)
Normal*
3
OFF
ON
4
+10%
3
OFF
ON
4
-10%
3
OFF
ON
4
Normal
3
OFF ON
4
Ramping Profile Dipswitches - Used to select a comfort
profile for the cooling mode.
Cooling Airflow Ramping Profiles (* indicates factory
setting)
Tap A*
5
OFF ON
6
Tap B
5
OFF ON
6
Tap C
5
OFF ON
6
Tap D
5
OFF ON
6