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© 2020
18-GJ28D1-1C-EN 29 Apr 2020
Supersedes 18-GJ28D1-1B (December 2014)
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 com-
municating 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 communi-
cate to the AFC the required airflow request and energize the
additional relays.
NOTE:
The EHC has “lead-lag” logic built in that energizes the elec-
tric 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 ener-
gize the “B” heater. The third time W1 only is energized; the K3
relay would close and energize the “C” heater.
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.
7.2 TAM8 Heater Operation
Control Board Jumper Settings
When the heater comes from the factory, all dip switches will be
in the ON (park) position. The control is already configured for the
heater size that is required, so no adjustments are necessary.
NOTE: If the dip switches are changed to another kw rating,
the original "Park" programming is not lost;, however the dip
switches must be placed in the ON (park) position or the cor-
rect kw of the heater model for normal operation.
Heater Wattage Selection Table
Heater Wattage
S1 SW1
S1 SW2
S1 SW3
S1 SW4
S1 SW5
PARK
ON
ON
ON
ON
ON
4 KW
ON
ON
ON
OFF
OFF
5 KW
OFF
ON
ON
ON
ON
8 KW
ON
OFF
ON
ON
ON
10 KW
ON
ON
OFF
ON
ON
15 KW
ON
ON
ON
OFF
ON
20 KW
ON
ON
ON
ON
OFF
25 KW
OFF
ON
ON
ON
OFF
