52 18-CD30D1-12
Installer’s Guide
▲
WARNING
!
SAFETY HAZARD
MAKE SURE THAT THE BLOWER DOOR IS IN PLACE
AND NOT AJAR. DANGEROUS FUMES COULD ESCAPE.
FAILURE TO FOLLOW WARNING COULD RESULT IN
SERIOUS PERSONAL INJURY OR DEATH.
This unit is equipped with a Blower Door Switch which
cuts power to the Furnace causing shutdown when the
door is removed. Operation with the door removed or ajar
can permit the escape of dangerous fumes. All panels
must be securely closed at all times for safe operation of
the Furnace.
NOTE TO INSTALLER
Review the following instructions with the homeowner.
Review contents of USER’S INFORMATION MANUAL
with the homeowner.
INSTRUCTIONS TO THE HOMEOWNER
▲
WARNING
!
EXPLOSION HAZARD
In the event that electrical, fuel, or mechanical fail-
ures occur, shut off the gas supply off at the manual
gas valve, located on the supply gas piping com-
ing into the furnace, before turning off the electrical
power to the furnace. Contact the service agency
designated by your dealer.
▲
WARNING
!
ELECTRICAL SHOCK HAZARD
DISCONNECT POWER TO THE UNIT BEFORE REMOV-
ING THE BLOWER DOOR. ALLOW A MINIMUM OF 10
SECONDS FOR IFC POWER SUPPLY TO DISCHARGE
TO 0 VOLTS.
CONTROL AND SAFETY SWITCH
ADJUSTMENTS
LIMIT SWITCH CHECK OUT
The Limit Switch is a safety device designed to close the
Gas Valve should the Furnace become overheated. Since
proper operation of this switch is important to the safe
operation of the unit, it
must be checked out on initial
start up by the installer.
To check for proper operation of the Limit Switches, set
the Comfort Control to a temperature higher than the in-
dicated room temperature to start the furnace. Restrict
the airflow by blocking the return air (disconnecting the
Indoor Blower may trip the Inducer Limit). When the Fur-
nace reaches the maximum outlet temperature as shown
on the rating plate, the burners must shut off. If they do
not shut off after a reasonable time and overheating is
evident, a faulty Limit Switch is probable and the Limit
Switch must be replaced. After checking the operation of
the Limit Control, be sure to remove the restriction from
the return air inlet.
AIRFLOW ADJUSTMENT
Check inlet and outlet air temperatures to make sure
they are within the range specified on the Furnace rat-
ing nameplate. If the airflow needs to be increased or
decreased, see the Airflow Label on the Furnace or
the unit’s Service Facts for information on changing the
speed of the Blower Motor for your specific model. Blower
speed changes are made on the User Interface.
▲
WARNING
!
ELECTRICAL SHOCK HAZARD
DO NOT TOUCH ANY COMPONENTS OTHER THAN THE
DISPLAY ASSEMBLY AND THE DOOR SWITCH DURING
THIS PROCEDURE.
FAILURE TO FOLLOW WARNING COULD RESULT IN
SERIOUS PERSONAL INJURY OR DEATH.
FAILURE TO FOLLOW THIS WARNING COULD RE-
SULT IN PROPERTY DAMAGE, PERSONAL INJURY OR
DEATH.
INDOOR BLOWER TIMING
Heating:
The Integrated Furnace Control module con-
trols the Indoor Blower. The Blower start is
fixed at 45 seconds after ignition. The FAN-
OFF period is field selectable via the User In-
terface menu at 60, 100, 140, or 180 seconds.
The factory setting is 100 seconds.
Cooling:
Continuous Fan mode is 50% of the cooling
CFM. This is a selectable range on the Com-
fort Control menu.
When in communicating mode, see Use Interface Menu
in furnace Installer's Guide.
