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73
SERVICING
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. Re-
place the motor if the resistance levels are unequal, open
circuited or short circuited.
4. Measure the resistance between each motor phase wind-
ing 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 DVPTC/MBVC
This section references the operation characteristics of the
DVPTC/MBVC models. The MBVC models utilize an integrat-
ed air handler control. The air handler control provides ECM
blower motor control and includes all dipswitches necessary to
set up the cooling, heat pump and electric airflow characteris-
tics.
The control has three banks of dipswitches: a bank for cooling
airflow and trim adjustment, a bank for selecting one of (4) en-
hancement 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 a/-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
Dehumidification Disable/Enable Dipswitch
- Reduces cooling
airflow by ~ 15% when enabled AND when used with a hu-
midistat (such as DEHUM1). Airflow is reduced when a call for
cooling is present and the humidistat is open.
7
8
OFF ON
DEHUM
Unused
Move to the ON position to
enable dehumidification
Electric Heater Airflow
- Airflow for installed electric heaters is
set by adjusting the dipswitches to the appropriate heater size.
Electric Heating Airflow (* indicates factory setting)
21 kW*
9
OFF ON
10
11
20 kW
9
OFF ON
10
11
15 kW
9
OFF ON
10
11
10 kW
9
OFF ON
10
11
8 kW
9
OFF ON
10
11
6 kW
9
OFF ON
10
11
5 kW
9
OFF ON
10
11
3 kW
9
OFF ON
10
11
Electric Heating Airflow (* indicates factory setting)
The table on the following page indicates the airflow that cor-
responds to the available dipswitch settings.