20
Horizontal Installations
Filters must be installed in either the central return register or
in the return air duct work.
Normal Sequence of Operation
Power Up
•
120 VAC power applied to furnace.
•
Integrated ignition control performs internal checks.
•
LED light will flash once at power up and then remain
on.
•
Integrated ignition control monitors safety circuits
continuously.
•
Furnace awaits call from thermostat.
Consider installing an air cleaner with deep-pleated media filter at the time of furnace installation. A deep-pleated filter with
a MERV rating of 8 (minimum) will often provide better filtration to protect equipment and the air distribution system than a
standard 1” filter and often has lower static pressure loss than a 1” filter. Also a deep-pleated filter will typically require less
frequent replacement intervals. Avoid using highly restrictive 1” filters which produce static pressure loss greater than .25”
W.C. In some installations the minimum filter size required (consult filter sizing chart) will not lend itself to a filter installation
on the side of the furnace. The installation of a centrally installed air cleaner cabinet or a return duct filter installation may
offer more practicality.
Clean Comfort™ brand MERV 11 air cleaners have 5¼” media filters and are available in the following configurations. Consult
your distributor for information on our complete line of IAQ Clean Comfort™ products.
Air cleaner installation location Maximum Heating Airflow Filter (Media) Dimensions Part Number
Air
Cleaner
Family
Side or bottom return
1200 CFM
16 in X 20 in x 5¼"
AM11-1620-5
Side or bottom return
1600 CFM
16 in X 25 in x 5¼"
AM11-1625-5
Side or bottom return
1600 CFM
20 in X 20 in x 5¼"
AM11-2020-5
Side or bottom return
2000 CFM
20 in X 25 in x 5¼"
AM11-2025-5
Side return
(for 2 separate returns)
Side return (Right angle)
2000 CFM
20 in X 25 in x 5¼"
AM11-2025-5RA AM11-5RA
Bottom return (platform)
2000 CFM
20 in X 25 in x 5¼"
AM11-2832-5PP
Bottom return (platform)
2000 CFM
20 in X 25 in x 5¼"
AM11-2843-5PP
AM11-5
2 X 1600 CFM
2, 16 in X 25 in x 5¼"
AM11-3225-5
AM11-3225
AM11-5PP
AM11-5
AM11-5RA
AM11-5PP
Family
Family
Family
Table 8
Heating Mode
The normal operational sequence in heating mode is as
follows:
•
R and W thermostat contacts close, initiating a call for
heat.
•
Integrated control module performs safety circuit
checks.
•
Induced draft blower is energized for 30 second pre-
purge period causing pressure sensor contacts to close.
•
Igniter warm up begins after 30 second prepurge
expires.
•
Gas valves open at end of igniter warm up period,
delivering gas to burners and establishing flame.
•
Integrated control module monitors flame presence.
Gas valve will remain open only if flame is detected.
