Start-Up; Low Ambient Damper Adjustment; (Factory Or Field Installed); Evp Chiller Applications - Trane RAUJ-C20 Installation, Operation And Maintenance Manual

Start-Up

Low Ambient Damper
Adjustment

(Factory or Field Installed)

When a unit is ordered with the low ambient option
(model number digit 11 =1), a damper is factory
installed over the lead condenser fan for each
refrigeration circuit. See Component Location drawings
in the Operating Principals chapter for damper location
illustrations for the appropriate unit.
For field installation, mount the dampers over the
condenser fans at the locations shown in Component
Location drawings and connect the actuator, controller,
and sensor for each circuit. (Refer to the Installation
Instructions provided with each low ambient damper
kit.)
The controller has a factory default setpoint of 80º F.
This setpoint can be adjusted by installing a field
supplied resistor on 2TB34 in the low ambient control
panel located in the back of the main control panel.
(See the low ambient wiring diagram that shipped with
the unit or with the field kit, for resistance values and
installation location.)
W W A A R R N N I I N N G G
L L i i v v e e E E l l e e c c t t r r i i c c a a l l C C o o m m p p o o n n e e n n t t s s ! !
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 a a l l l l e e l l e e c c t t r r i i c c a a l l s s a a f f e e t t y y p p r r e e c c a a u u t t i i o o n n s s
w w h h e e n n e e x x p p o o s s e e d d t t o o l l i i v v e e e e l l e e c c t t r r i i c c a a l l c c o o m m p p o o n n e e n n t t s s 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 . .
W W h h e e n n i i t t i i s s n n e e c c e e s s s s a a r r y y t t o o w w o o r r k k w w i i t t h h l l i i v v e e e e l l e e c c t t r r i i c c a a l l
c c o o m m p p o o n n e e n n t t s s , , h h a a v v e e a a q q u u a a l l i i f f i i e e d d l l i i c c e e n n s s e e d d e e l l e e c c t t r r i i c c i i a a n n
o o r r o o t t h h e e r r i i n n d d i i v v i i d d u u a a l l w w h h o o h h a a s s b b e e e e n n p p r r o o p p e e r r l l y y t t r r a a i i n n e e d d
i i n n h h a a n n d d l l i i n n g g l l i i v v e e e e l l e e c c t t r r i i c c a a l l c c o o m m p p o o n n e e n n t t s s p p e e r r f f o o r r m m
t t h h e e s s e e t t a a s s k k s s . .
Inspect the damper blades for proper alignment and
operation. Dampers should be in the closed position
during the "Off" cycle.
N N O O T T I I C C E E
A A c c t t u u a a t t o o r r D D a a m m a a g g e e ! !
D D o o n n o o t t d d e e p p r r e e s s s s a a c c t t u u a a t t o o r r c c l l u u t t c c h h w w h h i i l l e e a a c c t t u u a a t t o o r r i i s s
e e n n e e r r g g i i z z e e d d a a s s i i t t 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 a a c c t t u u a a t t o o r r d d a a m m a a g g e e . .
If adjustment is required:
1. Remove the sensor leads from the input terminals 6
and 7 for circuit #1 and/or 11 and 12 for circuit #2.
(Controller output signal will go to 0.0 VDC and the
damper will drive to the closed position.)
2. Loosen the actuator clamp.
3. Firmly hold the damper blades in the closed
position
4. Retighten the actuator clamp.
SS-SVX11K-EN
To check damper operation, jumper between the
sensor input terminals 6 and 7 and/or 11 and 12 (if
applicable). Controller output signal will go to 10 VDC
and damper will drive to full open position.

EVP Chiller Applications

Start the chilled water circulating pump by closing the
field provided pump disconnect switch and turn the
pump control circuit switch 5S1 "On".
Check the flow device to ensure it opens at minimum
flow and closes properly.
With water circulating through the system, check the
EVP chiller pressure drop and adjust the flow (if
necessary). Refer to the appropriate EVP chiller size in
for the operating pressure drop.

Freezestat Setting

At the remote panel, set the freezestat at a minimum of
5°F above the chilled water freezing temperature.
"Air Over" Evaporator
Application
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 . .
Verifying Proper Supply Fan Rotation
1. Verify the main power disconnect switch is off.
2. Unplug 1K21 & 1K22 reset relays from sockets in
the unit main control box to prevent inadvertent
compressor starts.
3. Ensure that the "System" selection switch at the
remote panel is in the "Off" position and the "Fan"
selection switch for the appropriate controls
application is in the "Auto" position. (VAV units do
not utilize a "Fan" selection input.)
105