19
WAHME Motor
The WAHME air handler features a General Electric energy saving
X13 motor. The X13 motor is a constant torque motor with very
low power consumption. The motor is energized by 24V AC.
Adjust the CFM by changing the 24V AC leads to the desired
speed on the terminal block.
The WAHME motor blower speed is programmed to deliver
adequate airflow at rated external static pressure and with
60 second off time delay. For details, refer to the specification
sheet applicable to your model.
CFM Delivery
The following table shows the CFM speed tap settings for the
WAHME.
SEQUENCE OF OPERATION
Cooling—Cooling Only or Heat Pump
When the thermostat calls for cooling, the circuit between R and
G is completed, and the blower relay is energized. The normally
open contacts close, causing the indoor blower motor to operate.
The circuit between R and Y is also completed; this circuit closes
the contactor in the outdoor unit starting the compressor and
outdoor fan motor. Circuit R and O energizes the reversing valve,
switching it to the cooling position. (The reversing valve remains
energized as long as selector switch is in the COOL position.)
Heating—Electric Heat Only
When the thermostat calls for heat, the circuit between R and W
is completed, and the heat sequencer relay is energized. A time
delay follows before the heating elements and the indoor blower
motor come on. Units with a second heat sequencer relay can be
connected with the first sequencer to W on the thermostat
subbase or connected to a second stage on the subbase.
Heating—Heat Pump
When the thermostat calls for heat, the circuits between R and Y
and R and G are completed. Circuit R-Y energizes the contactor
starting the outdoor fan motor and the compressor. Circuit R
and G energizes the blower relay starting the indoor blower
motor.
If the room temperature should continue to fall, the circuit
between R and W 1 is completed by the 2
nd
stage heat room
thermostat. Circuit R-W 1 energizes a heat sequencer relay. The
completed circuit will energize supplemental electric heat (if
available). Units with a second heat sequencer relay can be
connected with the first sequencer to W 1 on the thermostat or
connected to a second heating stage W 2 on the thermostat
subbase.
AIR HANDLER MAINTENANCE
IMPORTANT: Do not operate system without a filter. A filter is
required to keep excessive dirt and dust from the coil, blower,
and internal parts. See “Installation Configurations” for the
location of the filter in the unit cabinet and the service panel
giving access to the unit filter. The filter is placed in the supply air
return duct by the installer.
■
Inspect air filters at least once a month and replace or clean
as required. Dirty filters are the most common cause of
inadequate heating or cooling performance.
■
Replace disposable filters. Cleanable filters can be cleaned
by soaking in mild detergent and rinsing with cold water.
■
Install new/clean filters with the arrows on the side pointing in
the direction of airflow.
■
Do not replace a cleanable (high velocity) filter with a
disposable (low velocity) filter unless the return air system is
properly sized for it.
■
If water should start coming from the secondary drain line, a
problem exists which should be investigated and corrected.
Contact a qualified person.
Factory Speed Setting 4
WAHME1830
WAHME3137
WAHME4260
CFM
Setting
CFM
Setting
CFM
Setting
650
T1
800
T1
1,250
T1
800
T2
900
T2
1,400
T2
900
T3
1,050
T3
1,550
T3
1,050
T4
1,250
T4
1,800
T4
1,150
T5
1,350
T5
2,000
T5
Goodman 6
HIGH VOLTAGE!
WARNING
Disconnect ALL power before servicing.
Multiple power sources may be present.
Failure to do so may cause property damage,
personal injury or death.
