Trane RAUJ-C20 Installation, Operation And Maintenance Manual page 77

Discharge Air Sensor (Honeywell 6RT3 or
Honeywell 8RT3)
Each unit ordered with variable air volume controls
(digit 9 in the model number) is shipped with a
Honeywell 6RT3 or 8RT3 discharge air sensor.
W W A A R R N N I I N N G G
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 . .
W W A A R R N N I I N N G G
P P r r o o p p e e r r F F i i e e l l d d W W i i r r i i n n g g a a n n d d G G r r o o u u n n d d i i n n g g
R R e e q q u u i i r r e e d d ! !
F F a a i i l l u u r r e e t t o o f f o o l l l l o o w w c c o o d d e e 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 . .
A A l l l l f f i i e e l l d d w w i i r r i i n n g g M M U U S S T T b b e e p p e e r r f f o o r r m m e e d d b b y y q q u u a a l l i i f f i i e e d d
p p e e r r s s o o n n n n e e l l . . I I m m p p r r o o p p e e r r l l y y i i n n s s t t a a l l l l e e d d a a n n d d g g r r o o u u n n d d e e d d
f f i i e e l l d d w w i i r r i i n n g g p p o o s s e e s s F F I I R R E E a a n n d d E E L L E E C C T T R R O O C C U U T T I I O O N N
h h a a z z a a r r d d s s . . T T o o a a v v o o i i d d t t h h e e s s e e h h a a z z a a r r d d s s , , y y o o u u M M U U S S T T f f o o l l l l o o w w
r r e e q q u u i i r r e e m m e e n n t t s s f f o o r r f f i i e e l l d d w w i i r r i i n n g g i i n n s s t t a a l l l l a a t t i i o o n n a a n n d d
g g r r o o u u n n d d i i n n g g a a s s d d e e s s c c r r i i b b e e d d i i n n N N E E C C a a n n d d y y o o u u r r l l o o c c a a l l / /
s s t t a a t t e e / / n n a a t t i i o o n n a a l l e e l l e e c c t t r r i i c c a a l l c c o o d d e e s s . .
Install sensor in a turbulent free area of discharge air
duct where it will provide accurate supply air sensing
figure below for installation and sensor dimensions.
Figure 52. Discharge air sensor assembly
Mounting Holes
Airstream
Discharge Duct
Junction Box
7/8"
13-5/8"
Sensor Dimensions
The sensor serves two functions:
• Sends supply air temperature data to Discharge Air
Controller as an analog input, to control the
SS-SVX11K-EN
Insertion Hole
7/8" Dia.
VAV Discharge
Air Sensor
Air Inlet Holes
1-3/4"
1-3/16"
1-3/16"
1-3/4"
economizer (if applicable) and cycling of
compressors
• Low limit sensor for system when supply air
temperature reaches too high a delta T between
actual supply air temperature and supply air
temperature setpoint.
Before installing any connecting wiring, see drawings
in Dimensions and Weights chapter for electrical
access locations. Wire sensor per field connection
diagram, numbers 2307-9122 (for 20-60) and 2307-9144
(for 80-120). Shielded cable (Belden 8760 or equivalent)
must be used when wiring sensor to the terminal board
inside unit control panel.
Connect shielded cable to appropriate terminals on
terminal board (7TB7), in control panel.
Ground shield (at unit only) using ground screw in
customer 24 volt connection area as shown in field
connection diagram.
Suction Line Thermostat
W W A A R R N N I I N N G G
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 . .
Each unit ordered with variable air volume controls
(digit 9 in the model number) is shipped with a suction
line thermostat (6S63) that must be field installed.
Locate the thermostat close to the expansion valve
bulb on a slightly flattened portion of the suction line.
The thermostat must be securely fastened to the
suction line and a field provided thermoconductive
grease must be applied to the area to ensure good heat
transfer.
Before installing any connecting wiring, see drawings
in Dimensions and Weights chapter for electrical
access locations. Wire suction line thermostat per field
connection diagram, numbers 2307-9122 (for 20-60)
and 2307-9144 (for 80-120). See
Conductors) for wiring specifications.
Insulate the suction line, where the thermostat is
mounted, to isolate it from the surrounding air.
I I n n s s t t a a l l l l a a t t i i o o n n E E l l e e c c t t r r i i c c a a l l
Table 22, p. 68 (AC
77