Fan Motor - Friedrich Kuhl KCS12B10A Service Manual

Fan Motor

The Fan Motor installed in your Kuhl or Wallmaster unit is a dual shaft
motor driving both the condenser fan and the indoor blower wheel. De-
pending on the unit either a PSC or an ECM type motor will be installed.
The testing procedure for both is the same. The procedure for checking a
115 vac motor is also the same as checking a 230 vac motor.
1. Unplug the unit.
2. Remove front cover. Refer to Routine Maintenance.
WARNING
ELECTRIC SHOCK HAZARD
Turn off electric power before service or
installation. Extreme care must be used, if it
becomes necessary to work on equipment with
power applied.
Failure to do so could result in serious injury or
death.
3. Access Control Panel.
a. For Kuhl Units refer to
b. For Kuhl Q Units refer to
c. For Wallmaster units refer to
Replacement.
4. Open control box to gain access to board.
5. On Kuhl Q models remove display board from front panel and the plug
back in. Refer to Figure 707.
6 . Plug unit in.
70
COMPONENTS TESTING
Kuhl Control board replacement.
Kuhl Q Control Panel Replacement.
Wallmaster Control Board
Remove display board from front
panel and plug back in to avoid
damage to unit.
Figure 707
7. Set multi meter to check for 115/230 vac.
8. Place black probe on N/L2 terminal.
9. Place red probe on speed relay.
a. To check hi speed check power on relay with black wire.
b. To check medium speed check power on relay with blue wire.
c. To check low speed check power on relay with red wire.
Refer to Figure 708.
If Power is available at corresponding fan speeds but fan motor does run,
replace the fan motor.
L2/N
Low Speed
Terminal
(red Wire)
Med Speed
Terminal
(Blue Wire)
Hi Speed
Terminal
(Black Wire)
Figure 708