Dip Switch S2; Indoor Blower Timing; Airflow Control (Afc) - Trane 7 Series Field Reference Data

Dip Switch S2

• Set the S2-1 and S2-2 dip switches for the Cooling
and Heating CFM/Ton.
INDOOR MODEL S2‐1
OFF
OFF
*AM7A0A24H21SA
ON
ON
OFF
OFF
*AM7A0B30H21SA
ON
ON
OFF
OFF
*AM7A0C36H31SA
ON
ON
OFF
OFF
*AM7A0C42H31SA
ON
ON
OFF
OFF
*AM7A0C48H41SA
ON
ON
OFF
OFF
*AM7A0C60H51SA
ON
ON
* May be "A" or "T"
• Set the S2-3 and S2-4 dip switches for the Blower
Off Delay.
BLOWER OFF DELAY
1.5m @ 100%
NO DELAY
3m @ 50%
ENHANCED

Indoor Blower Timing

This ENHANCED MODE selection provides a ramping
up and ramping down of the blower speed to provide im-
proved comfort, quietness, and potential energy savings.
The graph on the right shows the ramping process.
Enhanced Mode works in cooling, HP, heating, Torque,
and constant CFM modes.
• Set the S2-5 dip switch for the airflow mode.
AIRFLOW MODE
*TORQUE
CONSTANT CFM
COOLING HEATING
CFM/TON CFM/TON
S2‐2
OFF 400 430
ON 360 390
OFF 380 410
ON 420 450
OFF 400 430
ON 360 390
OFF 380 410
ON 420 450
OFF 370 420
ON 350 400
OFF 390 440
ON 410 450
OFF 370 400
ON 330 360
OFF 350 380
ON 390 420
OFF 350 400
ON 330 380
OFF 370 420
ON 390 440
OFF 370 400
ON 380 410
OFF 390 420
ON 400 430
S2‐3 S2‐4
OFF OFF
OFF ON
ON OFF
ON ON
S2‐5
OFF
ON
OUTDOOR OUTDOOR
HP
1
1
R4
1
R NET 2
R1
U1
R13
R14

Airflow Control (AFC)

80%
Dehumidify
50%
Fast Coil Cooling
OFF
1 7.5
minute minutes
COMPRESSOR OPERATION ON
* Torque mode is optional and is recommended for high static
applications. High static conditions dramatically increase energy
consumption with variable speed motors. Evaluate the blower
performance table in relationship to the duct system to determine
the benefit of each installation.
* For the 2 ton air handler, torque mode will reduce airflow when
static is above approximately 0.3" water column.
* For the 2-1/2, 3, and 3-1/2 ton air handlers, torque mode will
reduce airflow when static is above approximately 0.35" water
column.
* For the 4 and 5 ton air handlers, torque mode will reduce airflow
when static is above approximately 0.4" water column.
When selected, Torque Mode is used for cooling operation only.
All heating modes default to constant CFM.
TAM7­9
on
}
Capacity (Tons)
AC (System)
2 (Stages)
2 (Compressor)
S1
INDOOR
R NET 1
on
CFM/Ton
Cool Off Delay
Torque
D9
S2
C10
+12V
R22
S2
100% if necessary
Efficiency
as required
3
minutes
OFF
CFM
50%
OFF