AC-SVX002C-EN
29
Freeze Avoidance
One or more of the ambient freeze avoidance methods
in the table below must be used to protect the chiller
from ambient freeze damage. See RF-PRB002*-EN for
more information.
N
No
otte
e:: Ascend
™
model ACS chillers use brazed plate
heat exchangers which are NOT at risk for
refrigerant migration freeze. Chiller must only be
protected from freeze due to low ambient
conditions.
Method
Protects to
ambient
temperature
Notes
Water
Pump
Control
Down to 0°F
•
Unit controller can start the pump when the ambient temperatures drops to prevent freezing. For this
option the pump must to be controlled by the chiller unand this function must be validated.
•
Heaters are factory-installed on the evaporator and water piping and will protect them from freezing.
•
If dual high head pump package option is selected, the chiller MUST control the pumps.
Heaters
Down to -20°F
•
Freeze protection heaters are provided on all chillers as standard.
•
Heaters are factory-installed on the evaporator and water piping and will protect them from freezing in
ambient temperatures down to -20°F (-29°C).
Note:
For units with optional pump package, heaters will protect to -4°F (-20°C) for water, -20°F
(-29°C) for ethylene glycol or propylene glycol
•
Install heat tape on all water piping, pumps, and other components that may be damaged if exposed
to freezing temperatures. Heat tape must be designed for low ambient temperature applications. Heat
tape selection should be based on the lowest expected ambient temperature.
•
See NOTICE below for important information.
Freeze
Inhibitor
Varies. See Low
Evaporator
Refrigerant Cutout,
Glycol
Requirements.
•
Freeze protection can be accomplished by adding sufficient glycol to protect against freezing below the
lowest ambient expected.
Drain
Water
Circuit
Below -20°F
•
Shut off the power supply to the unit and to all heaters.
•
Purge the water circuit.
•
Blow out the evaporator to ensure no liquid is left in the evaporator.
N
NO
OT
TIIC
CE
E
E
Eq
qu
uiip
pm
me
en
ntt D
Da
am
ma
ag
ge
e!!
F
Fa
aiillu
urre
e tto
o ffo
ollllo
ow
w tth
he
esse
e iin
nssttrru
uccttiio
on
nss cco
ou
ulld
d rre
essu
ulltt iin
n
e
eq
qu
uiip
pm
me
en
ntt d
da
am
ma
ag
ge
e..
A
Allll h
he
ea
atte
errss h
ha
av
ve
e sse
ep
pa
arra
atte
e p
po
ow
we
err ffrro
om
m tth
he
e u
un
niitt.. A
Allll
h
he
ea
atte
errss m
mu
usstt b
be
e e
en
ne
errg
giizze
ed
d o
orr tth
he
e u
un
niitt cco
on
nttrro
olllle
err
m
mu
usstt cco
on
nttrro
oll tth
he
e p
pu
um
mp
pss w
wh
he
en
n tth
he
e u
un
niitt iiss o
offff
((u
un
nlle
essss tth
he
e w
wa
atte
err cciirrccu
uiitt iiss d
drra
aiin
ne
ed
d o
orr ssu
uffffiicciie
en
ntt
g
glly
ycco
oll iiss u
usse
ed
d)).. IIn
n tth
he
e e
ev
ve
en
ntt o
off p
prro
ollo
on
ng
ge
ed
d p
po
ow
we
err
llo
ossss,, n
ne
eiitth
he
err h
he
ea
atte
errss n
no
orr u
un
niitt cco
on
nttrro
oll o
off tth
he
e p
pu
um
mp
pss
w
wiillll p
prro
otte
ecctt tth
he
e e
ev
va
ap
po
orra
atto
orr ffrro
om
m cca
atta
assttrro
op
ph
hiicc
d
da
am
ma
ag
ge
e.. IIn
n o
orrd
de
err tto
o p
prro
ov
viid
de
e ffrre
ee
ezze
e p
prro
otte
eccttiio
on
n iin
n
tth
he
e e
ev
ve
en
ntt o
off a
a p
po
ow
we
err llo
ossss y
yo
ou
u M
MU
US
ST
T d
drra
aiin
n tth
he
e
e
ev
va
ap
po
orra
atto
orr,, u
usse
e ssu
uffffiicciie
en
ntt ffrre
ee
ezze
e iin
nh
hiib
biitto
orr iin
n tth
he
e
e
ev
va
ap
po
orra
atto
orr o
orr p
prro
ov
viid
de
e b
ba
acckk--u
up
p p
po
ow
we
err ffo
orr p
pu
um
mp
p..
