Section 7. Heater Operation - Trane BAYEVCC25BK1A Installer's Manual

Control Board Jumper Settings
When the heater comes from the factory, the jumper will be
in the PARK position. The board is already configured for the
heater size that is required, so no adjustments are necessary.
NOTE: If the jumper is moved to another kW rating and
power is applied, the factory programming on the PARK
position is lost. The jumper must then be applied to the
appropriate rating per the heater model number.

Section 7. Heater Operation

7.1 TAM7/TAMG Heater Operation
Electric Heat
1. R-W contacts close on the comfort control sending 24VAC
to W1 of the AFC.
2. R-G contacts close on the comfort control sending 24VAC
to G of the AFC.
3. The AFC communicates to the EHC that 1st stage electric
heat is being called upon.
4. The EHC determines the number of elements that are used
for 1st stage and sends a message to the AFC for that
correct cfm. (The EHC determines the amount of heat per
stage by either factory programming or by the kw jumper
position)
5. The AFC micro-processor sends a command to the serial
communicating blower motor to run and close the blower
interlock relay on the EHC. The blower motor will now run at
the W1 electric heat cfm.
6. On subsequent calls for W2 and/or W3, the EHC will
communicate to the AFC the required airflow request and
energize the additional relays.
NOTE: The EHC has "lead-lag" logic built in that energizes the
electric heat relays based upon cycle counts.
For example: BAYEV**15 – The first time W1 only is energized;
the K1 relay would close and energize the "A" heater. The
second time W1 only is energized; the K2 relay would close
and energize the "B" heater. The third time W1 only is ener-
gized; the K3 relay would close and energize the "C" heater.
Trane
6200 Troup Highway
Tyler, TX 75707
7.2 TAM8 Heater Operation
Electric Heat
1.
When a request for electric heat is received, the AFC com-
municates to the EHC how much demand for auxiliary heat
is being requested
2. The EHC determines the number of elements that will be
used for this request and sends a message to the AFC for
proper airflow. (The EHC determines the amount of heat
available per stage by either factory programming or by the
kW jumper position)
3. The AFC sends a command to the serial communicating
blower motor to run proper airflow and close the blower
interlock relay on the EHC.
4. As demand from the thermostat increases, the EHC will com-
municate to the AFC the required airflow when energizing
additional relays.
NOTE: The EHC has "lead-lag or rotating" logic built in that en-
ergizes the electric heat relays based upon cycle counts. To
verify operation of all heating elements, switch thermostat
to Emergency Heat and raise the setpoint of the thermostat
at least 5 degrees above the actual room temperature.
Since the manufacturer has a policy of continuous product and product
data improvement, it reserves the right to change design and specification
without notice.