Discharge Air Sensor Checkout; (Honeywell Sensor); Economizer Actuator Checkout - Trane RAUJ-C20 Installation, Operation And Maintenance Manual

P P r r e e - - S S t t a a r r t t
Figure 69. W7100A discharge air controller
GND
24 VAC
TR
TR
W
SETPOINT °F
R
ECONO
B
Y
CHANGE
10
OVER
9
# STAGES RESET °F
8
7
RESET
6
T
SENSOR
T1
CONTROL
REMOTE
P
BAND °F
SETPOINT
P1
5
4
SATELLITE
3
2
1
Test Plug Socket
(Remove red dust cover)
Figure 70. Discharge duct sensor 6RT2 & 6RT3 "temperature vs resistance" curve
4200
4000
3800
3600
3400
3200
3000
20 40
(-6.7) (4.4)

Economizer Actuator Checkout

( ( U U s s e e d d w w i i t t h h " " Z Z o o n n e e " " o o r r " " D D i i s s c c h h a a r r g g e e A A i i r r " " T T e e m m p p
C C o o n n t t r r o o l l l l e e r r ) )
98
COOL
6
B
C
A
COOL
5
B
C
A
COOL
4
B
C
A
COOL
3
B
C
A
COOL
2
B
C
A
COOL
1
B
C
A
3483±10 ohms
77°F (25°C)
60 80 100
(15.6) (26.7) (37.8)
Temperature °F (°C)

Discharge Air Sensor Checkout

(Honeywell Sensor)

H H a a z z a a r r d d o o u u s s V V o o l l t t a a g g e e ! !
F F a a i i l l u u r r e e t t o o d d i i s s c c o o n n n n e e c c t t p p o o w w e e r r b b e e f f o o r r e e s s e e r r v v i i c c i i n n g g c c o o u u l l d d
r r e e s s u u l l t t i i n n d d e e a a t t h h o o r r s s e e r r i i o o u u s s i i n n j j u u r r y y . .
D D i i s s c c o o n n n n e e c c t t a a l l l l e e l l e e c c t t r r i i c c p p o o w w e e r r , , i i n n c c l l u u d d i i n n g g r r e e m m o o t t e e
d d i i s s c c o o n n n n e e c c t t s s b b e e f f o o r r e e s s e e r r v v i i c c i i n n g g . . F F o o l l l l o o w w p p r r o o p p e e r r
l l o o c c k k o o u u t t / / t t a a g g o o u u t t p p r r o o c c e e d d u u r r e e s s t t o o e e n n s s u u r r e e t t h h e e p p o o w w e e r r
c c a a n n n n o o t t b b e e i i n n a a d d v v e e r r t t e e n n t t l l y y e e n n e e r r g g i i z z e e d d . . V V e e r r i i f f y y t t h h a a t t n n o o
p p o o w w e e r r i i s s p p r r e e s s e e n n t t w w i i t t h h a a v v o o l l t t m m e e t t e e r r . .
1. Verify that the main power disconnect switch and
the control circuit switch 1S2, in the unit control
panel, is "OFF".
2. At the Discharge Air Controller, in the unit control
panel, disconnect the wire connected to Terminal
T1. Use a digital ohmmeter to measure the
resistance across Terminal T and the wire removed
from Terminal T1.
3. Use the conversion chart in
convert the measured resistance to an equivalent
temperature.
4. Measure the actual temperature at the sensor
location. If the measured resistance in step 2 is not
within ± 10.0 ohms of the actual temperature, the
sensor is out of range; replace it.
N N o o t t e e : : Before condemning the sensor, verify that
the connecting cable resistance is not
excessive. Refer to the "Field Installed
Control Wiring" section.
5. Make all necessary repairs and reconnect the duct
sensor lead to terminal T1 on the controller.
6. Restore power to the system and turn all control
switches to the "ON" position.
120 140 160
(48.9) (60.0) (71.1)
The following procedures should be used to verify that
the field provided economizer actuator(s) function
properly. These procedures are based on using a
typical Honeywell actuator. If another type actuator is
W W A A R R N N I I N N G G
Figure 70, p. 98
180 200
(82.2) (93.3)
SS-SVX11K-EN
to
220
(104.4)