F96CTN and G96CTN (Series A): Installation, Start-up, Operating, Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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Setup Switches
There are four sets of setup switches on the furnace control board. These
switches configure the furnace for correct application requirement. They
also select the airflow settings for Air Conditioning and Continuous Fan
airflows.
The Setup Switch locations are shown and described on
.
The
setup switches are also shown on the unit wiring label.
Setup Switches (SW1)
The furnace control has 8 setup switches that may be set to meet the
application requirements. Refer to the Adjustments section for setup
switch configurations. To set these setup switches for the appropriate
requirement:
1. Remove blower door.
2. Locate setup switches on furnace control.
3. Configure the setup switches as necessary for the application.
4. Replace blower door.
NOTE:
If a bypass humidifier is used, setup switch SW1-4
(Comfort/Efficiency) should be in OFF=Efficiency position. This
compensates for the increased temperature in return air resulting from
bypass.
NOTE:
If modulating dampers are used, blower motor automatically
compensates for modulating dampers.
Air Conditioning (A/C) Setup Switches (SW2)
The air conditioning setup switches are used to match furnace airflow to
required cooling airflow or high stage cooling airflow when a two-stage
outdoor unit is used. Refer to the Adjustments section for setup switch
configurations.
To set the desired cooling airflow:
1. Remove blower door.
2. Locate A/C setup switches on furnace control.
3. Determine air conditioning tonnage used.
4. Configure the switches for the required cooling airflow.
5. Replace blower door.
NOTE:
Incorrect airflow caused by improper A/C switch setup may
cause condensate blow-off or a frozen indoor coil in cooling mode.
Continuous Fan (CF) Setup Switches (SW3)
The CF setup switches are used to select desired airflow when
thermostat is in continuous fan mode or to select low-cooling airflow for
two-speed cooling units. Refer to the Adjustments section for setup
switch configurations. To set desired cooling airflow:
1. Remove blower door.
2. Locate CF setup switches on furnace control.
3. Determine air conditioning tonnage used for low cooling (when
used) or desired continuous fan airflow.
4. Configure the switches for the required airflow.
5. Replace blower door.
Additional Setup Switches (SW4)
The furnace control has three additional setup switches labeled SW4.
Setup switches SW4 are used for applications using a communicating
User Interface and to adjust airflow. SW4-3 is used to adjust airflow.
Refer to the Adjustments section for setup switch configurations. Refer
to User Interface instructions for other SW4 switch configurations.
1. Remove blower door.
2. Locate setup switch SW-4 on furnace control.
3. Configure the switches as necessary for the application.
4. Replace blower door.
Prime Condensate Trap with Water
1. Remove upper and middle collector box drain plugs opposite of the
A11392
Fig. 61 – Priming Condensate Trap
2. Connect field-supplied 5/8-in. (16 mm) ID tube with attached
funnel to upper collector box drain connection. See
3. Pour one quart (liter) of water into funnel/tube. Water should run
through collector box, overfill condensate trap, and flow into open
field drain.
4. Remove funnel; replace collector box drain plug.
5. Connect field-supplied 5/8-in. (16mm) ID tube to middle collector
box drain port.
6. Pour one quart (liter) of water into funnel/tube. Water should run
through collector box, overfill condensate trap, and flow into open
field drain.
7. Remove funnel and tube from collector box and replace collector
box drain plug.
Purge Gas Lines
If not previously done, purge the lines after all connections have been
made and check for leaks.
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow these warnings could result in personal injury or
death.
Failure to use a properly configured trap or NOT water-priming trap
before operating furnace may allow positive pressure vent gases to
enter the structure through drain tube. Vent gases contain carbon
monoxide which is tasteless and odorless.
CAUTION
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in intermittent unit operation
or performance satisfaction.
Condensate trap must be PRIMED or proper draining may not occur.
The condensate trap has two internal chambers which can ONLY be
primed by pouring water into the inducer drain side of condensate trap.
