Bryant OBM154 Installation Instructions Manual page 15

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 the 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 strats 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.
No adjustment required
-
Table 7 – Airflow data, models with 1 ECM motor
OIL HEATING MODE
24 VAC input (R) on W only
HEAT INPUT
CFM with SW3-ADJ
DIP switch position A
(USGPH)
0.90
1.10
24 VAC input (R) on G only
A/C size (TON)
5.0
4.0
3.5
3.0
COOLING OR HEAT PUMP HEATING MODE
24 VAC input (R) to G, Y/Y2 and O (for cooling)
A/C size (TON)
5.0
4.0
3.5
3.0
DELAY PROFILE FOR OIL HEATING MODE
HEAT
INPUT
(USGPH)
0.90
1.10
All
All
DELAY PROFILE FOR COOLING OR HEAT PUMP HEATING MODE
A/C size
All
CFM with SW3-ADJ
DIP switch position B
1450
1700
Settings not used in this mode
CONTINUOUS FAN
CFM with SW3-ADJ
DIP switch position A DIP switch position B
1500
1200
1050
900
CFM with SW3-ADJ
DIP switch position A DIP switch position B
2000
1600
1400
1200
PreRun On-Delay
CFM Level - Time
13% - 90 sec.
13% - 60 sec.
13% - 90 sec.
13% - 60 sec.
PreRun On-delay
CFM Level - Time
NO DELAY
14
CFM with SW3-ADJ
DIP switch position C
1595
1870
CFM with SW3-ADJ
DIP switch position C
1725
1380
1205
1035
CFM with SW3-ADJ
DIP switch position C
2200
1760
1540
1320
ShortRun On-Delay Off-Delay CFM Level -
CFM Level - Time
31% - 30 sec
31% - 30 sec
31% - 30 sec
31% - 30 sec
ShortRun On-delay Off-Delay CFM level -
CFM Level - Time
NO DELAY
1305
1530
CFM with SW3-ADJ
1275
1020
890
765
CFM with SW3-ADJ
1800
1440
1260
1080
Time
50% - 4 min.
38% - 5 min.
56% - 5 min.
44% - 5 min.
Time
100% - 90 sec