Amana AVPTC25B14, Инструкция по установке и эксплуатации

Страница: 13 / 32

13
17 Circulator Blower
This air handler is equipped with a multi-speed circulator blower.
This blower provides ease in adjusting blower speeds. The Speci-
fication Sheet applicable to your model provides an airflow table,
showing the relationship between airflow (CFM) and external static
pressure (E.S.P.), for the proper selection of heating and cooling
speeds. The heating blower speed shipped is set at 21kW or 25kW,
and the cooling blower speed is set at “D”. These blower speeds
should be adjusted by the installer to match the installation re-
quirements so as to provide the correct electric heating CFM and
correct cooling CFM.
Use the CFM LED (green) to obtain an approximate airflow quan-
tity. The green CFM LED blinks once for each 100 CFM of airflow.
1. Determine the tonnage of the cooling system installed with
the air handler. If the cooling capacity is in BTU/hr divide 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 airflow for the cooling system. Most
cooling systems are designed to work with airflows between
350 and 450 CFM per ton. Most manufacturers recommend
an airflow 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 airflow. Any electronic air cleaners or other devices
may require a specific airflow; consult installation instructions
of those devices for requirements.
3. Knowing the air handler model, locate the high stage cool-
ing airflow charts in the Specification Sheet applicable to your
model. Look up the cooling airflow determined in step 2
and find the required cooling speed and adjustment setting.
Example: An AVPTC31C14 air handler installed with a 2.5
ton air conditioning system. The airflow needed is 1000 CFM.
Looking at the cooling speed chart for AVPTC31C14, find the
airflow closest to 1000 CFM. A cooling airflow of 1000 CFM
can be attained by setting the cooling speed to “C” and the
adjustment to “0” (no adjustment).
4. Locate the blower speed selection DIP switches on the inte-
grated control module. Select the desired “cooling” speed
tap by positioning switches 1 and 2 appropriately. If airflow
adjustment is required, set dip switch S8 (trim enable) to ON
(trim enable default is off). Then select the desired “adjust”
tap by positioning switches S3 and S4 appropriately. Refer
to the following
Airflow Adjust Taps figure for switch posi-
tions and their corresponding taps. Verify CFM by counting
the number of times the green CFM LED blinks, see page 13
for LED locations.
COM
TH
TR
DE
CAS
HUM
O
R
2
1
C
2
1
ST4
ST3
ST2
ST1
3A
C
Y2
24VAC
FUSE
W1 W2
R
C
G
W1
W2
Y1
3
2
Dip Switches
Green CFM LED
Seven Segment
LED
Auxiliary
Alarms
Communicating Board
Figure 21