Bryant 987MA Installation, Start-Up, Operating And Service And Maintenance Instructions page 72

S E T U P S W T I C
SW1-1
SW1-2
SW1-3
SW1-4
SW1-5
SW1-6
SW1-7 & SW1-8
SW4-2
SW4-3
1
SW 2, AC (Cooling Airflow) SETUP SWITCHES
The AC setup switch selects desired cooling or high stage cooling (two stage units) airflow.
AC
See Cooling Air Delivery Tables for specific switch settings
SW 3, CF (Continuous Fan) SETUP SWITCHES
1
The CF setup switch selects desired Continuous Fan Airflow
The CF switch position is the Low Cooling airflow selection for two stage cooling units.
SW 3 cannot be set for airflow higher than SW 2
CF
See Continuous Fan Air Delivery Tables for specific switch settings
Furnace Setup Switch Description
H S W T I C H N A M E
Status Code Recovery
Minimum Heat Only
(Adaptive Heat Mode
when SW1-2 and SW4-2
are OFF)
Min/Int Heat Rise
Adjustment
Comfort/Efficiency
Adjustment
CFM per ton adjust
Component Self Test
Blower OFF delay
Intermediate Heat
Only
(Adaptive Heat Mode
when both SW1-2 and
SW4-2 are OFF)
CFM per ton Adjust
AIR CONDITIONING (A/C) SETUP SWITCHES
CONTINUOUS FAN (CF) SETUP SWITCHES
Fig. 57 - - Furnace Setup Switches and Description (Continued)
N O R M A L P O I S I T O N
Turn ON to retrieve up to 7 stored status codes for
OFF troubleshooting assistance when R thermostat lead is
disconnected.
When SW1-2 and SW4-2 are OFF allows Modulating operation
with a single stage thermostat. Turn ON SW1-2 when using
two-stage thermostat to allow Minimum Heat operation when
OFF
R to W/W1 closed and a Maximum heat operation when R to
W/W1 and R to W2 close.
Turn ON to increase Minimum Heat and Intermediate Heat T ON t i
airflow by 15%. This compensates for increased return air
OFF
temperature caused with bypass humidifier. This also inc-
reases the Minium and Intermediate Heat inducer speed 15%.
Turn ON to decrease Minimum heat airflow by 9 percent,
Intermediate Heat airflow 7 percent and Maximum Heat
ON
airflow 15 percent for maximum comfort.
Turn ON for 400 CFM per ton, Turn OFF for 350 CFM per ton.
OFF
See also SW4.
Turn ON to initiate Component Self Test for troubleshooting
assistance when R thermostat lead is disconnected. Turn
OFF
OFF when Self Test is completed.
Blower Off Delay time – adjustable 90 seconds to 180 Bl Off D l
seconds. See table in Adjustments section or refer to unit
ON or OFF
wiring diagram.
When SW1-2 and SW4-2 are OFF allows Modulating operation
with a single stage thermostat. Turn ON SW4-2 when using
two-stage thermostat to allow Intermediate Heat operation
when R to W/W1 closed and a Maximum heat operation when
OFF
R to W/W1 and R to W2 close.
Allows additional CFM per ton selections when used with SW Allows additional CFM per ton selections when used with SW
1-5
325 CFM per ton (nominal) when SW 4-3 ON and SW 1-5 OFF
350 CFM per ton (nominal) when SW 4-3 OFF and SW 1-5 OFF
OFF
370 CFM per ton (nominal) when SW4-3 ON and SW 1-5 ON
400 CFM per ton (nominal) when SW 1-5 ON and SW 4-3 OFF
See Air Delivery Tables for model specific CFM vs. static
pressure p
72
D E S C R P I I T O N O F U S E
Mi i H t d I t di t H t
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A13308