F80CTL & G80CTL: Installation, Start–Up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
19
A190154
Fig. 32 – Variable Speed Furnace Control for ECM Blower Motor
VENTING
The furnace shall be connected to a listed factory built chimney or vent,
or a clay-tile lined masonry or concrete chimney. Venting into an unlined
masonry chimney or concrete chimney is prohibited.
When an existing Category I furnace is removed or replaced, the original
venting system, may no longer be sized to properly vent the attached
appliances. An improperly sized Category I venting system could cause
the formation of condensate in the furnace and vent, leakage of
condensate and combustion products, and spillage of combustion
products into the living space.
Vent system or vent connectors may need to be resized. Vent systems or
vent connectors must be sized to approach minimum size as determined
using appropriate table found in the current edition of NFGC.
GENERAL VENTING REQUIREMENTS
Follow all safety codes for proper vent sizing and installation
requirements, including local building codes, the National Fuel Gas
Code NFPA 54/ANSI Z223.1 (NFGC), Parts 12 and 13 in the United
States, the local building codes, and furnace and vent manufacturers’
instructions.
These furnaces are design-certified as Category I furnaces in accordance
with ANSI Z21.47/CSA 2.3 and operate with a non-positive vent static
pressure to minimize the potential for vent gas leakage. Category I
furnaces operate with a flue loss not less than 17 percent to minimize the
potential for condensation in the venting system. These furnaces are
approved for common venting and multistory venting with other fan
assisted or draft hood equipped appliances in accordance with the
NFGC, the local building codes, and furnace and vent manufacturers’
instructions. The following information and warning must be considered
in addition to the requirements defined in the NFGC.
1. If a vent (common or dedicated) becomes blocked, the furnace will
be shut off by the draft safeguard switch located on the vent elbow.
2. Two-stage furnaces require Type B vent connectors outside the
casing in all configurations. Single wall vent connector may be
used inside the furnace casing with the transition to Type B vent
outside the furnace casing. Size the connector so that the FAN-Min
vent connector capacity is equal to or lower than the low fire rate of
the furnace and the FAN-Max vent connector capacity is equal to or
higher than the furnace high fire rate.
3. Do not vent this Category I furnace into a single wall dedicated or
common vent. The dedicated or common vent is considered to be
the vertical portion of the vent system that terminates outdoors.
4. Vent connectors serving Category I furnaces shall not be connected
into any portion of a mechanical draft system operating under
positive pressure.
5. Do not vent this appliance with any solid fuel burning appliance.
6. Category I furnaces must be vented vertically or nearly vertically
unless equipped with a listed mechanical venter. See SIDEWALL
VENTING section.
7. Do not vent this appliance into an unlined masonry chimney. (Refer
to Chimney Inspection Chart, Fig. 33.
24-V THERMOSTAT
TERMINALS
PL2 – HOT SURFACE
IGNITER & INDUCER
MOTOR CONNECTOR
115-VAC (L2) NEUTRAL
CONNECTIONS
115-VAC (L1) LINE
VOLTAGE CONNECTIONS
EAC-1 TERMINAL
PL1 – LOW VOLTAGE MAIN
HARNESS CONNECTOR
TRANSFORMER 24-VAC
CONNECTIONS
3-AMP FUSE
STATUS AND COMM
LED LIGHTS
SW1 SETUP
SWITCHES AND
BLOWER OFF-
DELAY
MODEL PLUG
CONNECTOR
COMMUNICATION
CONNECTOR
AIR CONDITIONING (A/C) &
CONTINUOUS FAN (CF)
AIRFLOW SETUP SWITCHES
OUTDOOR
AIR TEMP
CONNECTOR
HUMIDIFIER
TERMINAL (24-VAC
0.5 AMP MAX.)
FLASH
UPGRADE
CONNECTOR
(FACTORY
ONLY)
SOFTWARE
VERSION
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal injury or death.
Do not bypass the draft safeguard switch, as an unsafe condition could
exist which must be corrected.
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