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32. INDOOR BLOWER OPERATION
All models have three speed direct drive blower
motors. If supply and return ducts are connected to
the unit, the ducts must be of adequate size. Refer to
the appropriate blower tables. See Tables 9, 10 and
11 for maximum static pressures acceptable. Note the
minimum CFM for cooling operation.
If voltage and duct design permit, (see blower tables)
single speed operation can be achieved as follows:
230 VOLT BLOWER MOTOR SPEED CHANGE
1. Disconnect main power supply to unit.
2. Remove the unwanted indoor motor speed tap (red
low, blue medium, black high) from the blower
control. This wire is to be connected to terminal
marked "Unused Motor Leads". See Figure 17.
3. Next install a jumper wire with multiplier between
HEAT and COOL terminals and attach desired
blower motor speed lead to other side of multiplier.
4. Energize the system in cooling and heating modes
and check for proper blower operation.
Manual 2100-365
Page 30
FIGURE 17
FURNACE CONTROL BOARD AND BLOWER CONTROL
460 VOLT BLOWER MOTOR SPEED CHANGE
Field changeover from the factory blower motor
speed settings can require change several different
motor leads, the addition or deletion of a wire.
Refer to blower motor wiring options as shown below
for the correct wiring of the blower motor for the
application involved.
1. Cooling operation on high speed, heating operation
on medium speed or low speed. (Standard WG481
and WG601 factory setting.) See
Figure 18 A.
2. Cooling operation and heating operation on
medium speed. (Standard WG421 factory setting)
See Figure 18 B.
3. Cooling operation on medium speed, heating
operation on low speed. See Figure 18 C.
NOTE: Based on the wiring diagram used a jumper
wire between terminal #3 of the indoor
blower relay cooling and terminal #3 of the
indoor blower relay heating may be required
to be removed or added.
MIS-1482
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