GM9S80 Service Manual
SERVICING
32
CONNECTOR ID DESCRIPTION CONNECTOR VOLTAGE
L LINE, L1 LINE, L1
G GROUND CHASSIS GROUND
N LINE, L2 LINE, L2
C SIGNAL COMMON 24VAC COMMON
1 TAP 1 24VAC
2 TAP 2 24VAC
3 TAP 3 24VAC
4 TAP 4 24VAC
5 TAP 5 24VAC
Motor Tap Identification
-
also show the amount of air being delivered at a given static
by a given motor speed or pulley adjustment.
The furnace motor cannot deliver proper air quantities (CFM)
against statics other than those listed.
-
-
ing in limit tripping, etc. Whereas not enough static may re-
sult in motor overloading.
To determine proper air movement, proceed as follows:
1.
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.
static pressure.
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.
registers, undersized and/or oversized poorly laid out duct
work.
.
The more air (CFM) being delivered through a given fur-
nace, the less the rise will be; so the less air (CFM) being
delivered, the greater the rise. The temperature rise should
rise may result in condensing in or overheating of the heat
and adjust temperature rise as follows:
1.
-
ceed input rating stamped on rating plate. Ensure all
registers are open and all duct dampers are in their
2. Place thermometers in the return and supply ducts as
close to the furnace as possible. Thermometers must
SUPPLY
AIR
RETURN
AIR