Bosch TA Series Installation And Maintenance Manual page 8

8 Ta series
If the thermostat is provided with a malfunction
light powered off of the common (C) side of the
transformer, a jumper between "R" and "COM"
terminal of "ALR" contacts must be made.
If the thermostat is provided with a malfunction
light powered off of the hot (R) side of the
transformer, then the thermostat malfunction
light connection should be connected directly
to the (ALR) contact on the unit's UPM board.
To the left of the thermostat connection block are a
row of 2 red and 4 green LED's. These LED's indicate
the operating status of the unit. They are labeled as
follows:
EM (red) Emergency Heat On
W1 (red) Auxiliary Heat On
O (green) Reversing Valve Energized, unit is in
cooling mode
Y2 (green) Second Stage Compressor On
Y1 (green) First Stage Compressor On
G (green) Fan On
Just above the connector block is a single red LED
labeled CFM that will blink intermittently when the
unit is running and may fl icker when the unit is off.
This LED indicates the air delivery of the blower at
any given time. Each blink of the LED represent 100
CFM of air delivery so if the LED blinks 12 times,
pauses, blinks 12 times, etc. the blower is delivering
1200 CFM. Refer to Figure #7 for factory
programmed air delivery settings for the TA Series.
To the right of the thermostat connection block is a
green LED labeled dehumidify.
Just above and to the right of the thermostat
connection block are four sets of jumper pins labeled
Figure 7: Motor Profi le Air Flow Table CFM
Two Stage Units
Model Fan
only
TA025 600
TA035 900
TA049 1200
TA061 1300
TA071 1300
6 720 220 046
Caution
Caution
Y1 Y2
Cool/ Cool/ HeaT
HeaT HeaT
750 950
1000 1200
1300 1700
1500 2000
1500 2100
Subject to change without prior notice
ADJ, DELAY, HEAT and COOL. The ADJ set of pins are
labeled NORM, (+), (-) and TEST. TA units will all be set
on the NORM position from the factory, however,
airfl ow can be increased (+) or decreased (-) by 15%
from the pre-programmed setting by relocating the
jumper in this section. The TEST position is used to
verify proper motor operation. If a motor problem is
suspected, move the ADJ jumper to the TEST position
and energize G on the thermostat connection block. If
the motor ramps up to 100% power, then the motor
itself is functioning normally. Always remember to
replace the jumper to NORM, (+) or (-) after testing and
reset the unit thermostat to restore normal operation.
Do not set the ADJ jumper to the (-) setting
when electric heaters are installed. Doing so
may cause the heaters to cycle on their
thermal overload switches, potentially
shortening the life of the switches.
The other three sets of jumper pins are used to
select the proper program in the ECM motor for the
unit. Refer to Figure #7 for the proper jumper
placement.
Always disconnect power before changing
jumper positions on the interface board and
reset the unit afterward.
To the left of the red and green status LED's is a row
of 1/4" male quick connects. These are used to pass
thermostat inputs on to the rest of the control
circuit. Remember to always turn off unit power at
the circuit breaker before attaching or disconnecting
any wiring from these connections to avoid
accidental short circuits that can damage unit
control components.
auX eMerG Plus
HeaT adJ
950 950 1090
1200 1200 1400
1700 1700 1950
2000 2000 2100
2100 2100 2300
Thermostat Connections
MINus TaP Cool/
adJ HeaT/delaY
800
1000
1450
1900
1900
A
A
B
A
A
Revised 05-12