Trane LPC, Инструкции по установке и эксплуатации

Страница: 56 / 110

56 LPC-SVX01C-EN
Operation
general
information
Table O-GI-4. Analog input functions & locations
Tracer AH540 Tracer AH541
factory field
output terminal terminal terminal valid
label label label label function sensor type 1 ranges
IN 1 TB31/1 IN J31 IN1 space temperature 10 k
Ω
5 to 122°F
TB31/2 GND thermistor
IN 2 TB32/1 IN J32 IN2 local setpoint 1 k
Ω
50 to 85°F
TB32/2 GND potentiometer
IN 3 TB33/1 IN J33 IN3 fan mode switch 2 switched off (4870
Ω
± 5%)
TB33/2 GND resistance auto (2320
Ω
± 5%)
IN 4 TB34/1 IN J34 IN4 discharge air 10 k
Ω
-40 to 212°F
TB34/2 GND temperature thermistor
IN 5 TB35/1 IN J35 IN5 outdoor air 10 k
Ω
-40 to 212°F
TB35/2 GND temperature thermistor
IN 6 TB36/1 IN J36 IN4 mixed air RTD
3
-40 to 212°F
TB36/2 GND temperature
IN 13
4
TB43 space relative current: 0 to 100%
humidity 4-20 mA
CO
2
sensor current: 0 to 2000 ppm
4-20 mA
entering water temperature 10 k
Ω
-40 to 212°F
thermistor
evaporator refrigerant 10 k
Ω
-40 to 212°F
temperature thermistor
generic temperature 10 k
Ω
-40 to 212°F
thermistor
duct J43 duct duct static pressure duct static 0 to 1250 Pa
static static pressure 0 to 5.02 in.
sensor water
Analog inputs
The Tracer AH540/541 controller has
eight analog inputs. Table O-GI-4
describes the function of each of the
analog inputs. Each function is
described in the following paragraphs.
IN1: Space temperature
Analog input IN1 measures space
temperature only. The space temperature
is measured with a 10kW thermistor that
is included with Trane zone sensors. The
Tracer AH540/541 receives the space
temperature from either a wired zone
sensor or as a communicated value. A
communicated value has precedence
over a locally wired sensor input.
Therefore, the communicated value,
when present, is automatically used by
the controller.
If a Tracer AH540/541 is operating in
constant-volume space temperature
control mode and the space temperature
fails or does not receive a communicated
value, the controller generates a Space
Temperature Failure diagnostic.
The space temperature input may also
be used to generate timed override On/
Cancel requests to the controller. If a
momentary short in the space tempera-
ture signal occurs, the Tracer AH540/541
interprets the signal as a timed override
On request.
The Tracer AH540/541 uses the timed
override On request (while the zone is in
unoccupied mode) as a request to go to
the occupied bypass mode (occupied
bypass). The occupied bypass mode lasts
for the duration of the occupied bypass
time, typically 120 minutes. The occupied
bypass time can be changed using the
Rover service tool.
Press the Cancel button on the zone
sensor to cancel the override request and
return the controller to unoccupied mode.
This creates a momentary fixed resis-
tance (1.5
Ω
), which sends a Cancel
request to the space temperature input.
IN2: Local setpoint
Analog input IN2 functions as the local
(hard-wired) temperature setpoint
for applications using a Trane zone sensor
with a temperature setpoint thumbwheel
(see “Zone sensors”). The local setpoint
input is configurable (as enabled or
disabled) using the Rover service tool.
Notes: 1 See Appendix for analog input sensor curves .
2 Sensor type: Switched resistance fan auto = 2320
Ω
, ±5%, fan off = 4870
Ω
, ±5%.
3 Sensor type RTD averaging sensor, 1000
Ω
at 0°C, platinum 385 curve.
4 This input is located on the main control board.
A setpoint value communicated by
means of a Comm5 link can also be used
for controllers operating on a building
automation system. If both hard-wired
and communicated setpoint values are
present, the controller uses the
communicated value. If neither a hard-
wired nor a communicated setpoint value
is present, the controller uses the stored
default setpoints (configurable using the
Rover service tool). If a valid hard-wired
or communicated setpoint value is
established and then is no longer present,
the controller generates a Setpoint
Failure diagnostic.
IN3: Fan mode switch
Analog input IN3 responds to specific
resistances corresponding to a fan mode
switch provided with certain Trane zone
sensors. The fan modeswitch on a Trane
zone sensor generates the fan mode
signal.
The Tracer AH540/541 controller detects
the unique resistance corresponding to
each position of the fan mode switch. By
measuring this resistance, the controller
determines the requested fan mode. See
Table O-GI-5.
If the Tracer AH540/541 controller does
not receive a hard-wired or communi-
cated request for fan mode, the unit
recognizes the fan input as Auto.
Table O-GI-5. Determining fan mode (IN3)
Fan modes Tracer AH540/541 operation
off fan off (4870
Ω
±1%)
auto occupied mode: the fan runs
unoccupied mode: the fan
cycles off when no heating or
cooling is required (2320
Ω
±5%)