Amana GUIA Series Service Instructions Manual page 68

PRODUCT DESIGN
1. In any application:
If "G" from the thermostat is connected to "G" on the
furnace two-stage integrated control module , then the
continuous fan blower speed will be the same as the
selected low stage heating speed tap.
If "G" from the thermostat is connected to "G" on the
circulator blower interface board , then the continuous
fan blower speed will be 75% of the selected high stage
cooling speed tap.
NOTE: The EAC (Electronic Air Cleaner) terminals on
the two-stage integrated control module will not ener-
gize using this method. To energize the EAC terminals,
the "G" wire from the thermostat must be connected
directly to the "G" terminal on the two-stage integrated
control module.
2. In two-stage heating/single-stage (or no) cooling appli-
cations:
If "G" from the thermostat is connected to "Y1" on the
circulator blower interface board , then the continuous
fan blower speed will be 65% of the selected high-stage
cooling speed tap.
NOTE: The EAC (Electronic Air Cleaner) terminals on
the two-stage integrated control module will not ener-
gize using this method. To energize the EAC terminals,
the "G" wire from the thermostat must be connected
directly to the "G" terminal on the two-stage integrated
control module.
3. In two-stage heating only/no cooling applications:
If "G" from the thermostat is connected to "Y" on the
furnace two-stage integrated control module, then the
Continuous Fan blower speed will be the same as the
selected high stage cooling speed tap.
Depending on the heating input of the furnace and the ca-
pacity of the accompanying cooling system, one continu-
ous fan speed may be preferable to another. The lower the
continuous fan speed, the lower the electrical consumption.
When using an electronic air cleaner, make sure the con-
tinuous fan speed's CFM is within the CFM range listed for
the electronic air cleaner. Refer to Fan Speed Charts in the
furnace Technical Manual or the product Specification Sheet
for proper blower speed pin selection.
CIRCULATOR BLOWER SPEED ADJUSTMENT
WARNING
To avoid death or personal injury due to electrical
shock, turn off power to the furnace before changing
speed taps.
All 80% & 90% single-stage and two-stage furnaces ship at
high speed for cooling and the speeds listed in the Specifi-
cation Sheet for heating. These speeds should be adjusted
by the installer to match the job requirements. See Specifi-
cation Sheet or Technical Manual for details.
68
Rev. 1
Connect the correct motor leads to the COOL, LO HEAT,
HI HEAT, and PARK terminals. If high heating speed equals
cooling speed, use the jumper wire provided. All unused motor
leads that are not connected to "PARK" terminals on the
control must be taped to prevent shorts.
All 80% & 90% Two-Stage Variable Speed furnaces are
shipped with heating speed set at "B" and cooling speed set
at "D". Use the following procedure to select the heating and
cooling speed needed for your unit.
To verify airflow quantity use the "RED" CFM LED on the
circulator blower interface board on GUIV/CA/DX & GUVA-
AX models or "GREEN" CFM LED adjacent to the integrated
control module fuse on GUVA-BX models to verify airflow
quantity. The red or green CFM LED blinks once for each
100 CFM of airflow.
1. Determine the tonnage of the cooling system installed
with the furnace. If the cooling capacity is in BTU/hr di-
vide it by 12,000 to convert capacity to TONs.
EXAMPLE: Cooling Capacity of 30,000 BTU/hr.
30,000/12,000 = 2.5 Tons
2. Determine the proper air flow for the cooling system.
Most cooling systems are designed to work with air flows
between 350 and 450 CFM per ton. Most manufacturers
recommend an air flow of about 400 CFM per ton.
EXAMPLE: 2.5 tons X 400 CFM per ton = 1000 CFM
The cooling system manufacturer's instructions must
be checked for required air flow. Any electronic air clean-
ers or other devices may require specific air flows, con-
sult installation instructions of those devices for require-
ments.
3. Knowing the furnace model, locate the high stage cool-
ing air flow charts in the specification sheet. Look up the
cooling air flow determined in step 2 and find the re-
quired cooling speed and adjustment setting.
EXAMPLE: A GUVA070AX40 furnace installed with a
2.5 ton air conditioning system. The air flow needed is
1000 CFM. Looking at the cooling speed chart for
GUVA070AX40, find the air flow closest to 1000 CFM.
A cooling airflow of 990 CFM may be attained by set-
ting the cooling speed to "C" and the adjustment to "-"
(minus).
4. Locate the circulator blower interface board on the con-
trol panel in the blower compartment. On the circulator
blower interface board, find the "COOL" speed tap se-
lector pin and move it to the proper speed. Next find the
"ADJUST" tap selector pin and move it to the proper
adjust level. Verify CFM by counting blinks of the "RED"
CFM LED. Refer to the following figure.