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C
B
S
IRCULATOR
LOWER
PEEDS
T
O AVOID PERSONAL INJURY OR DEATH DUE TO ELECTRICAL SHOCK
OFF
TURN
POWER TO THE FURNACE BEFORE CHANGING SPEED TAPS
This furnace is equipped with an ECM circulator blower. The
heating blower speed is shipped set at "B", and the cooling blower
speed setting is "D". These blower speeds should be adjusted
by the installer to match the installation requirements so as to
provide the correct heating temperature rise and correct cooling
CFM.
Use the dual 7-segment LED display adjacent to the DIP switches
to obtain the approximate airflow quantity. The airflow quantity
is displayed as a number on the display, rounded to the nearest
100 CFM. The display alternates airflow delivery indication and
the operating mode indication.
Example: The airflow being delivered is 1225 CFM. The display
indicates 12. If the airflow being delivered is 1275, the display
indicates 13.
1. Determine the tonnage of the cooling system installed
with the furnace. 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 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 cleaners or other devices
may require specific quantity of air, consult installation instruc-
tions of those devices for requirements.
3. Knowing the furnace model, locate the high stage cooling
air flow table. Look up the cooling air flow determined in
step 2 and find the required cooling speed and adjustment
setting.
Example:
A DM97MC0603BN** furnace installed with
a 2.5 ton air conditioning system. The air
flow needed is 1000 CFM. Looking at the
cooling speed chart for DM97MC0603BN**,
find the air flow closest to 1000 CFM. A
cooling airflow of 1000 CFM can be
attained by selecting the cooling speed
"C" and the adjustment to "normal".
44
WARNING
Model
,
*MVM970603BN*
.
*MVM970803BN*
*MVM970804CN*
*MVM971005CN*
*MVM971205DN*
*CVM970603BN
*CVM970803BN
*CVM970804CN*
*CVM971005CN*
*1 00% CFM shown. CFM will vary pro portio nally with the gas valve B TU/H input.
4. Continuous fan speed is selectable at 25%, 50%, 75%
or 100% of the furnace's maximum airflow capability.
Example:
5. Locate the blower speed selection DIP switches on the
integrated control module. Select the desired "cooling"
speed tap by positioning switches 1 and 2 appropriately.
Select the desired "adjust" tap by positioning switches 9
and 10 appropriately. Refer to the DIP switch chart for
switch positions and their corresponding taps. Verify CFM
by noting the number displayed on the dual 7-segment
LED display.
6. The multi-speed circulator blower also offers several
custom ON/OFF ramping profiles for cooling. These
profiles may be used to enhance cooling performance
and increase comfort level. The ramping profiles
are selected using DIP switches 7 and 8. Refer to the
bullet points below for a description of each ramping
profile. Verify CFM by noting the number displayed on
the dual 7-segment LED display.
Low
High Stage
Tap
Stage
Cool
Cool
A
398
599
B
557
817
696
1007
C
810
1212
D
A
403
629
540
806
B
705
1023
C
819
1230
D
513
789
A
660
967
B
791
1182
C
913
1375
D
564
820
A
784
1133
B
982
1464
C
1259
1736
D
547
867
A
831
1160
B
1020
1467
C
1278
1910
D
A
433
656
541
790
B
686
972
C
806
1195
D
A
405
624
B
549
808
C
678
994
D
784
1177
556
837
A
714
1022
B
C
838
1206
991
1475
D
524
784
A
B
744
1078
927
1388
C
1185
1766
D
If the furnace's maximum airflow capability
is 2000 CFM, the continuous fan speed at
25% will be 0.25 x 2000 or 500 CFM.
100%
Low heat
Heat
CFM for
*CFM
2 stage
953
667
1059
740
1158
808
1260
881
1202
855
1316
923
1389
1033
1396
1063
1228
867
1337
939
1430
1016
1516
1077
1818
1256
1870
1292
1910
1316
1957
1358
1891
1329
1940
1362
1968
1390
2028
1440
938
687
950
751
986
814
992
874
1057
758
1146
815
1256
882
1349
946
1234
889
1325
944
1442
1019
1528
1068
1759
1209
1797
1249
1840
1277
1881
1300
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