48
18-GJ82D1-1F-EN
TAM9 Sequence of Operation
Abbreviations
•
AFC = Airflow Control
•
EVC = Expansion Valve Control
•
EEV = Electronic Expansion Valve
N
No
otte
e:: When used with variable speed outdoor units,
indoor airflow and EEV starting position is
controlled by the outdoor unit IVSC through the
data line between the units.
N
No
otte
e:: Use variable speed outdoor Sequence of
Operation in conjunction with the TAM9
Sequence of Operation.
The installing and servicing technician should have an
understanding of the sequence of operation to be able
to properly setup and diagnose functions of the air
handler.
S
Se
ee
e u
un
niitt,, e
elle
eccttrriicc h
he
ea
att,, a
an
nd
d ffiie
elld
d w
wiirriin
ng
g d
diia
ag
grra
am
mss
ffo
orr a
ad
dd
diittiio
on
na
all iin
nffo
orrm
ma
attiio
on
n..
C
Co
on
nttiin
nu
uo
ou
uss F
Fa
an
n
IIm
mp
po
orrtta
an
ntt:: If the indoor air exceeds 60% relative
humidity or simply feels uncomfortably
humid, it is recommended that the indoor
fan only be used in the AUTO mode.
1.
When a fan request is received from the
thermostat, the AFC sends a command to the serial
communicating blower motor to run. Airflow can be
adjusted through the thermostat.
2. Humidity Control – When enabled at the
thermostat, this feature will disable any blower off
delays and disable continuous fan mode when the
humidity is above the dehumidification setpoint.
This will help prevent coil condensation from being
evaporated back into the air stream.
C
Co
oo
olliin
ng
g M
Mo
od
de
e
1. When a request for 1st stage cooling is received,
the AFC sends a command to the serial
communicating blower motor to run at 1st stage
cooling airflow. (Delay profiles from the thermostat
may change blower motor timing and actual airflow
demand)
2. The EVC will receive input from the two
temperature sensors and start to control 1st stage
superheat. .
3.
When a request for 2nd stage cooling is received,
the AFC sends a command to the serial
communicating blower motor to run at 100 %
cooling airflow.
4. The EVC will now control superheat for 2nd stage.
5.
When a request for cooling is removed, the AFC
will turn off the blower motor after any user
selected fan-off delays have expired.
N
No
otte
e:: Delay profiles from the thermostat may change
blower motor timing and actual airflow demand.
H
He
ea
att p
pu
um
mp
p ((cco
om
mp
prre
esssso
orr o
on
nlly
y))
1. When a request for 1st stage heat is received, the
AFC sends a command to the serial communicating
blower motor to run at 1st stage heating airflow.
2. Humidifier contacts close on demand from
thermostat.
3. The EVC will drive the EEV to the heating position
and refrigerant will flow in the reverse cycle.
4. When a request for 2nd stage mechanical heat is
received, the AFC sends a command to the serial
communicating blower motor to run at 100 %
heating airflow.
5. When a request for heat pump is removed, the AFC
will turn off the blower motor after any user
selected fan-off delays have expired.
N
No
otte
e:: Delay profiles from the thermostat may change
blower motor timing and actual airflow demand.
E
Elle
eccttrriicc H
He
ea
att
1. When a request for electric heat is received, the AFC
will energize the on board 24 volt relays per the
amount of heat requested from the thermostat and
the size of the heater installed.
2. The AFC sends a command to the serial
communicating blower motor to run proper airflow
and close the blower interlock relay on the EHC.
H
Hy
yd
drro
on
niicc H
He
ea
att
1. When a request for hydronic heat is received, the
AFC will energize the on board W1 relay.
2. The AFC sends a command to the serial
communicating blower motor to run at the
requested CFM.
D
De
effrro
osstt
1.
The OD unit will initiate defrost and send a
message to the AFC.
2. The AFC will communicate to the EVC that the OD is
in defrost and the EVC will start to control the
correct superheat.
3. Electric or hydronic heat will be energized to help
temper the air.
F
Frre
ee
ezze
e P
Prro
otte
eccttiio
on
n
1. The EVC control has the ability to sense when the
indoor coil is beginning to ice. If this event should
occur, the AFC will send a message to de-energize
the OD unit.
2. The indoor blower motor will continue running to
aid in defrosting the coil.
