Installation Instructions

30
To determine total external duct static pressure, proceed as
follows;
1. With clean filters in the furnace, use a draft gauge (in-
clined manometer) to measure the static pressure of the
return duct at the inlet of the furnace. (Negative Pres-
sure)
2. Measure the static pressure of the supply duct. (Positive
Pressure)
3. The difference between the two numbers is .4” w.c.
Example:
static reading from return duct = -.1" w.c.
static reading from supply duct = .3" w.c.
total external static pressure on this system = .4" w.c.
NOTE: Both readings may be taken simultaneously and read
directly on the manometer if so desired. If an air conditioner
coil or Electronic Air Cleaner is used in conjunction with the
furnace, the readings must also include theses components,
as shown in the following drawing.
4. Consult proper tables for the quantity of air.
If the total external static pressure exceeds the maximum
listed on the furnace rating plate, check for closed dampers,
registers, undersized and/or oversized poorly laid out duct
work.
The temperature rise of the furnace must be within the tem-
perature rise range listed on the furnace rating plate.
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
AM11-5PP
AM11-5
2 X 1600 CFM 2, 16 in X 25 in x 5¼" AM11-3225-5 AM11-3225
AM11-5
Family
AM11-5RA
Family
AM11-5PP
Family