Installation Guide

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4. Adjust temperature rise by adjusting the circulator blower
speed. Increase blower speed to reduce temperature rise.
Decrease blower speed to increase temperature rise. Refer
to the following section for speed changing details.
CIRCULATOR BLOWER SPEED ADJUSTMENT
T O AVOID PERSONAL INJURY OR DEATH DUE TO ELECTRICAL SHOCK ,
TURN OFF POWER TO THE FURNACE BEFORE CHANGING SPEED TAPS .
WARNING
Furnaces are equipped with EEM circulator blower motor. Refer to
the Blower Performance Data in the back of the manual for proper
selection of heating and cooling speeds. The cooling speed is set
at (T5), Heating at (T2) and circulation at (T1). These blower speeds
should be adjusted by the installer to match the installation
requirements so as to provide the correct heating temperature
rise and the correct cooling CFM.
To adjust the circulator blower speed, proceed as follows:
1. Turn OFF power to the furnace.
2. Select the heating and cooling blower speeds that match
the installation requirements from the airflow table in the
Specification Sheet applicable to your model. (Please
contact your distributor or our website for the applicable
Specification Sheet referred to in this manual.)
3. Turn ON power to furnace.
4. Verify proper temperature rise as outlined in Temperature
Rise section.
O PERATIONAL C HECKS
WARNING
T
O AVOID PERSONAL INJURY OR DEATH, DO NOT REMOVE ANY INTERNAL
COMPARTMENT COVERS OR ATTEMPT ANY ADJUSTMENT.
E
LECTRICAL
COMPONENTS ARE CONTAINED IN BOTH COMPARTMENTS.
C
ONTACT A
QUALIFIED SERVICE AGENT AT ONCE IF AN ABNORMAL FLAME APPEARANCE
SHOULD DEVELOP.
CHECKING DUCT STATIC
Refer to your furnace rating plate for the maximum ESP (external
duct static) rating.
Total external static refers to everything external to the furnace
cabinet. Cooling coils, filters, ducts, grilles, registers must all be
considered when reading your total external static pressure. The
supply duct pressure must be read between the furnace and the
cooling coil. This reading is usually taken by removing the “A”
shaped block off plate from the end on the coil; drilling a test hole
in it and reinstalling the block off plate. Take a duct static reading
at the test hole. Tape up the test hole after your test is complete.
The negative pressure must be read between the filter and the
furnace blower.
Too much external static pressure will result in insufficient air
that can cause excessive temperature rise. This can cause limit
switch tripping and heat exchanger failure.
To determine total external duct static pressure, proceed as follows;
1. With clean filters in the furnace, use a draft gauge (inclined
manometer) to measure the static pressure of the return
duct at the inlet of the furnace. (Negative Pressure)
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.
Checking Static Pressure
(80% Furnace Shown, 90% Similar)
BURNER F LAME
The burner flames should be inspected with the burner compartment
door installed. Flames should be stable, quiet, soft, and blue
(dust may cause orange tips but they must not be yellow). Flames
should extend directly outward from the burners without curling,
floating, or lifting off. Flames must not impinge on the sides of the
heat exchanger firing tubes.