International comfort products C9MVX Installation Instructions Manual page 45

2. Change the heat or cool blower motor speed by removing the
motor lead from the "HI HEAT or LO HEAT" or "COOL"
terminal and replace it with the desired motor speed lead from
the "M1" or "M2" location. Connect the wire previously
removed from the "HI HEAT or LO HEAT" or "COOL" terminal
to the vacated "M1" or "M2" terminal.
3. If the same speed must be used for both heating and cooling,
remove the undesired motor speed lead from the "HI HEAT or
LO HEAT" or "Cool" terminal and connect that lead to the
open terminal at "M1" or "M2" location or tape off. Attach a
jumper between the "HI HEAT or LO HEAT" and "Cool"
terminals and the remaining motor speed lead.
Note: When using the same speed on motors with (4) speed
leads, it will be necessary to tape off the terminal of the motor
speed lead removed from the "HI HEAT or LO HEAT" or
"Cool" terminal with electrical tape since an open terminal will
not be available at the "M1" or "M2" location.
Continuous-Fan using "G"
Energizing the "G" terminal on the furnace control board provides
continuous fan operation. This is done by connecting the G
terminal of the thermostat to the G terminal on the furnace control
board. When the FAN switch is turned from auto to ON the fan will
operate continuously at "LO HEAT" speed. EAC will be energized
in this mode.
NOTE: In heating, the fan will turn off during furnace ignition and
warm up then restart at heating speed.
Hard-Wired Continuous Fan
A terminal is provided on the furnace control board located in the
circulating air blower compartment for operation of the continuous
fan option. This connection is intended for the low speed motor tap,
and has a lower contact rating (8 amps) than the heat and cool taps.
When the low speed blower lead is connected to this terminal, it will
provide low speed blower operation whenever the other three
speeds ("HI HEAT or LO HEAT" or COOL) are not energized.
Thoroughly check the system after modification to ensure the
proper operation of the circulating air blower in all modes of
operation.
Separate Speed Selections for Low Heat, High Heat,
Cool, and Continuous-Fan
Connect low speed lead from circulating air motor to the "CONT"
terminal at the furnace control board. The appropriate motor leads
should already be connected to the "HI HEAT and LO HEAT" and
"COOL" terminals.
Heating and Continuous-Fan Speed the Same
If it is necessary to operate the Low Heat speed and
continuous−fan speed using the same blower speed, connect a
jumper between the "LO HEAT" and "CONT FAN" terminals on
the furnace control board.
Note: There should be only ONE motor lead going to the "LO
HEAT" and "CONT FAN" terminals.
440 01 2024 04
Blower Adjustments (*9MPV, *9MVX)
Changing Blower Speed
!
ELECTRICAL SHOCK HAZARD
Failure to follow the warning could result in
personal injury or death.
Turn OFF power, lockout, and tag switch with a
suitable warning label, to furnace before changing
blower speed.
NOTE: The blower speeds that the manufacturer sets from the
factory for this product are based on a nominal 400 CFM (189 L/s)
per ton cooling and the mid range on the temperature rise for
heating.
Since the manufacturer cannot predict the static pressure
that will be applied to the furnace, it is the responsibility of the
installing dealer/contractor to select the proper speeds for
the application when the furnace is installed.
If it is necessary to change speeds, refer to steps below.
1. The 115 VAC power supply to the furnace must be turned
OFF before making adjustments to the motor.
NOTE: Allow at least 1 minute before restoring power to the
furnace after making Blower Control changes.
2. The heating, cooling and continuous blower speeds can be
adjusted by changing the SW2 DIP switch settings that are
located on the Tap Select Interface Board (see Figure 48).
* Switches #1 and #2 adjust the continuous blower speeds.
Switches #3 and #4 adjust the heating speed.
Switches #5 and #6 adjust the cooling speed.
Switches #7 and #8 adjust the cooling speed on/off delay
profiles. See the "Technical Support Manual" for the switch
settings for the desired airflow rates for the installation.
The jumper J1 is used to slightly increase (+) or decrease
(−) or not change (NOM) the blower speed selected from
SW2. J1 effects BOTH cooling and heating airflow.
* To set continuous blower to run in high cooling speed for all
low cooling (Y1) calls, DIP switch settings #1 to 1=ON and
#2 to 0=OFF or DIP switches #1 to 1=ON and #2 to 1=ON.
* To set continuous blower to operate normally in low cooling
(Y1), DIP switch settings #1 to 0=OFF and #2 to 0=OFF or
#1 to 0=OFF and #2 to 1=ON.
Continuous-Fan using "G"
Energizing the "G" terminal on the furnace control board provides
continuous fan operation. This is done by connecting the G
terminal of the thermostat to the G terminal on the furnace control
board. When the FAN switch is turned from auto to ON the fan will
operate continuously at airflow selected by DIP SW2 switch #1 and
DIP SW2 switch #2. EAC will be energized in this mode.
NOTE: In heating, the fan will not turn off during furnace ignition
and warm up.
Hard Wired Continuous Fan Operation
Not available for variable speed models.
Specifications are subject to change without notice.
WARNING
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