Table 7: Airflow Data, Models With 1/2 Hp Ecm Motors - Bryant OBM098 Installation Instructions Manual

SW1- HEAT
DIP switch position
A
(1=OFF, 2=OFF)
B
(1=ON, 2=OFF)
C
(1=OFF, 2=ON)
D
(1=ON, 2=ON)
SW2- COOL
DIP switch position
A
(1=OFF, 2=OFF)
B
(1=ON, 2=OFF)
C
(1=OFF, 2=ON)
D
(1=ON, 2=ON)
SW2- COOL
DIP switch position
A
(1=OFF, 2=OFF)
B
(1=ON, 2=OFF)
C
(1=OFF, 2=ON)
D
(1=ON, 2=ON)
In Cooling - Dehumidification mode, with no 24 VAC input to DH, the CFMs are reduced by 15%.
The CFMs shown are reduced by 20% if there is 24 VAC input to Y1 (first stage of 2-stage cooling unit)
SW4- DELAY
DIP switch position
A
(1=OFF, 2=OFF)
B
(1=ON, 2=OFF)
C
(1=OFF, 2=ON)
D
(1=ON, 2=ON)
PreRun and ShortRun are the periods of time when the blower starts at very low CFM to minimize the
distribution of cool air in the system and then runs up to normal speed.
Off Delay is the time required to cool down the heat exchanger with low CFMs, to minimize cool draft in the
air distribution system.
DELAY PROFILE FOR COOLING OR HEAT PUMP HEATING MODE
No adjustment
required
-
PreRun and ShortRun are the periods of time when the blower starts at very low CFM to minimize the
distribution of cool air in the system and then runs up to normal speed.
Off Delay is the time required to cool down the coil (heating mode) with low CFMs, to minimize cool draft
in the air distribution system.

Table 7: Airflow data, models with 1/2 HP ECM motors

OIL HEATING MODE
24 VAC input (R) on W only
HEAT INPUT CFM with SW3-ADJ
(USGPH) DIP switch position A
0,70
0,60
0,50
Same value as DIP switch position A
CONTINUOUS FAN
24 VAC input (R) on G only
A/C size CFM with SW3-ADJ
(TON) DIP switch position A
3,0
2,5
2,0
1,5
COOLING OR HEAT PUMP HEATING MODE
24 VAC input (R) to G, Y/Y2 and O (for cooling)
A/C size CFM with SW3-ADJ
(TON) DIP switch position A
3,0
2,5
2,0
1,5
DELAY PROFILE FOR OIL HEATING MODE
HEAT INPUT PreRun On-Delay
(USGPH) CFM Level - Time
0,75 13% - 45 sec.
0,65 13% - 45 sec.
0,50 13% - 60 sec.
All 13% - 30 sec.
PreRun On-Delay
A/C size
CFM Level - Time
All No delay
CFM with SW3-ADJ
DIP switch position B
1260 1385
1050 1155
850 935
CFM with SW3-ADJ
DIP switch position B
900 1035
750 860
600 690
450 515
CFM with SW3-ADJ
DIP switch position B
1200 1320
1000 1100
800 880
600 660
ShortRun On-Delay
CFM Level - Time
19% - 30 sec
19% - 60 sec
13% - 60 sec
100% - 30 sec
ShortRun On-Delay
CFM Level - Time
No delay
16
CFM with SW3-ADJ
DIP switch position C
1135
945
765
CFM with SW3-ADJ
DIP switch position C
765
635
510
380
CFM with SW3-ADJ
DIP switch position C
1080
900
720
540
Off-Delay
CFM Level - Time
38% - 3 min.
38% - 3 min.
38% - 3 min.
100% - 2 min.
Off-Delay
CFM Level - Time
100% - 90 sec.