Sterlco 30RA Outdoor Air Cooled Central Chillers 10-60 Tons - Manual (Page 23)

23
Fig. 1
9
—
M
a
in P
o
we
r
a
nd
C
o
ntr
o
l Conn
e
c
tions
—
30RA
032-
0
55 W
it
h
o
u
t H
y
d
ro
n
ic
P
a
c
k
a
g
e
NO
TES:
1.
F
a
ctor
y
wir
ing is in
accorda
n
ce
with UL 1995
st
andards
.
A
n
y
field wir
ing modifications or
additions m
u
st b
e
in compliance with all applicab
le codes.
2.
Wir
ing f
o
r main field supply must be r
a
ted 75 C minimum. Use copper f
o
r all unit
s
. Maxi-
m
u
m incoming w
ire siz
e
f
o
r the ter
m
inal b
loc
k is 350 kcmil. Ma
xim
u
m incoming wire
siz
e
fo
r 100-amp non-fused
disconnect is #1 A
W
G. Maximum incoming wire siz
e
f
o
r 25
0-amp
non-fused disconnect is 35
0 kcmil.
3.
T
e
rm
inals 9
and 10 of
TB5 are f
o
r field e
x
te
rnal co
nnections f
o
r
remote on-off
.
The
contacts must be
r
a
te
d f
o
r
dr
y circuit
application
capab
le of
handling
a 24-v
a
c load
up
to
50 mA.
4.
T
e
rm
inals 1 and 2 of TB5 are connected to the f
a
ctor
y-installed chilled w
a
te
r
flow
s
witch
(CWFS).
T
o
add
chilled w
a
ter
pump inter
loc
k contacts
,
remov
e
the or
ange har
ness wire
from TB5-1 and wire
co
ntacts in
ser
ies as sho
w
n. The contacts
must be r
a
ted f
o
r dr
y cir-
cuit application capab
le of handlin
g a 24-v
a
c load u
p
to 50 mA.
5.
T
e
rm
inals 11 and 13 of TB5 a
re f
o
r control of Chilled W
a
ter Pump 1 (CWP1) star
ter
. T
e
rm
i-
nals 13
and 15 of
TB5 are
fo
r control
of Chilled W
a
ter Pu
mp 2 (CWP2)
star
ter
.
The
maxim
u
m
load allow
ed f
o
r the
chilled water pump
rela
y
is 75
v
a
sealed, 360
v
a
inr
u
sh
at
115 v
. Field po
wer supply is not required.
6.
T
e
rm
inals 12 and 13 of TB5 are f
o
r an alar
m rela
y.
The maximum load allo
w
ed f
o
r the
alar
m rela
y is 75 v
a
sealed
, 360 v
a
inr
u
sh at 1
15 v
. Field po
w
e
r s
upply is not required.
7.
Mak
e
appropr
iate
connections to TB6
as sho
w
n f
o
r Energ
y
Management Board
optio
ns
.
The contacts
fo
r Demand
Limit and Ice
Done options
m
u
st be
ra
ted f
o
r dr
y circuit a
pplica-
tion capab
le of handling a 24-v
a
c load up to 50 mA
.
LE
GE
N
D
A
—
Ala
rm
EM
M
—
E
nerg
y
Management
Field P
o
w
e
r Wir
ing
CWP
—
Chille
d W
a
ter Pump
SP
T
—
S
u
ction Pressure T
ransducer
Field Control Wir
ing
CWPI
—
Chille
d W
a
ter Pump In
ter
loc
k
TB
—
T
e
rm
inal Bloc
k
F
actor
y
-Installed Wir
ing