S-61A Checking Heater Limit Control(S) - Goodman ASX Service Instructions Manual

SERVICING
Other components such as a Heating/Cooling Thermostat
and Outdoor Thermostats are available to complete the
installation.
The system CFM can be determined by measuring the static
pressure external to the unit. The installation manual
supplied with the blower coil, or the blower performance table
in the service manual, shows the CFM for the static mea-
sured.
Alternately, the system CFM can be determined by operating
the electric heaters and indoor blower WITHOUT having the
compressor in operation. Measure the temperature rise as
close to the blower inlet and outlet as possible.
If other than a 240V power supply is used, refer to the BTUH
CAPACITY CORRECTION FACTOR chart below.
BTUH CAPACITY CORRECTION FACTOR
SUPPLY VOLTAGE
MULTIPLICATION FACTOR
EXAMPLE: Five (5) heaters provide 24.0 KW at the rated
240V. Our actual measured voltage is 220V, and our
measured temperature rise is 42°F. Find the actual CFM:
Answer: 24.0KW, 42°F Rise, 240 V = 1800 CFM from the
TEMPERATURE RISE chart on the right.
Heating output at 220 V = 24.0KW x 3.413 x .84 = 68.8
MBH.
Actual CFM = 1800 x .84 Corr. Factor = 1400 CFM.
NOTE: The temperature rise table is for sea level installa-
tions. The temperature rise at a particular KW and CFM will
be greater at high altitudes, while the external static pressure
at a particular CFM will be less.
TEMPERATURE RISE (F°) @ 240V
4.8 7.2 9.6
CFM
KW KW KW
600 25 38 51
700 22 33 43
800 19 29 38
900 17 26 34
1000 15 23 30
1100 14 21 27
1200 13 19 25
1300 12 18 23
1400 11 16 22
1500 10 15 20
1600 9 14 19
1700 9 14 18
1800 8 13 17
1900 8 12 16
2000 8 12 15
2100 7 11 14
2200 7 11 14
2300 7 10 13
48
250 230 220 208
1.08 .92 .84 .75
14.4 19.2 24.0 28.8
KW KW KW KW
- - - -
- - - -
57 - - -
51 - - -
46 - - -
41 55 - -
38 50 - -
35 46 - -
32 43 54 65
30 40 50 60
28 38 47 57
27 36 44 53
25 34 42 50
24 32 40 48
23 30 38 45
22 29 36 43
21 27 34 41
20 26 33 39
ELECTRIC HEATER CAPACITY BTUH
HTR 3.0 4.7 6.0
KW KW KW KW
BTUH 10200 16200 20400 23800 32400 48600 66500 71600
FORMULAS:
Heating Output = KW x 3413 x Corr. Factor
Actual CFM = CFM (from table) x Corr. Factor
BTUH = KW x 3413
BTUH = CFM x 1.08 x Temperature Rise (T)
CFM = KW x 3413
1.08 x T
T = BTUH
CFM x 1.08

S-61A CHECKING HEATER LIMIT CONTROL(S)

Each individual heater element is protected with a limit control
device connected in series with each element to prevent
overheating of components in case of low airflow. This limit
control will open its circuit at approximately 150°F.
HIGH VOLTAGE!
Disconnect ALL power before servicing
or installing. Multiple power sources
may be present. Failure to do so may
cause property damage, personal injury
or death.
1. Remove the wiring from the control terminals.
2. Using an ohmmeter, test for continuity across the nor-
mally closed contacts. No reading indicates the control
is open - replace if necessary.
IF FOUND OPEN - REPLACE - DO NOT WIRE AROUND.
S-61B CHECKING HEATER FUSE LINK
(OPTIONAL ELECTRIC HEATERS)
Each individual heater element is protected with a one time
fuse link which is connected in series with the element. The
fuse link will open at approximately 333°.
WARNING
Disconnect ALL power before servicing.
1. Remove heater element assembly so as to expose fuse
link.
7.0 9.5 14.2 19.5
KW KW KW KW
21.0
KW