4
INSTALLATION MANUAL AND OPERATING
INSTRUCTIONS
VoLTAgE rATing TABLEs
AT Boiler Electrical Specifi
cat
ions
o
perating at
240 Vac
“
at
” Series - 2 Element
b
oiler
*Reco
mmended Wire
m
odel
b
oiler Size
No
minal kW
Vo
lt
age
(a
C)
o
utput
Po
wer
(Watts)
o
utput
Po
wer
bt
U/Hr.
Amperage
Element
Size
(Watts) at
240Vac
Number
Elements
a
ccesso
ry
lo
ad (
a
)
tot
al
Amps
m
C
a
mo
P
60°C
(140º
f)
a
WG
75°C
(167º
f)
a
WG
90°C
(194º
f)
a
WG
AT0623
6
240
6,000
20,500
25.0
3,000
2
6
31.0
38.8
40.0
8
8
10
AT0824
8
240
8,000
27,300
33.3
4,000
2
6
39.3
49.2
50.0
6
8
8
AT1025
10
240
10,000
34,100
41.7
5,000
2
6
47.7
59.6
60.0
4
6
6
AT1226
12
240
12,000
41,000
50.0
6,000
2
6
56.0
70.0
70.0
4
4
6
“at
” Series - 4 Element
b
oiler
AT1243
12
240
12,000
41,000
50.0
3,000
4
6
56.0
70.0
70.0
4
4
6
AT1644
16
240
16,000
54,600
66.7
4,000
4
6
72.7
90.8
100.0
2
3
4
AT2045
20
240
20,000
68,200
83.3
5,000
4
6
89.3
111.7
125.0
1/0
2
2
AT2446
24
240
24,000
82,000
100.0
6,000
4
6
106.0
132.5
150.0
2/0
1/0
1
o
perating at
208 Vac
“at
” Series - 2 Element
b
oiler
*Reco
mmended Wire
AT0623
6
208
4,507
15,400
21.7
3,000
2
6
27.7
34.6
35.0
8
10
10
AT0824
8
208
6,009
20,500
28.9
4,000
2
6
34.9
43.6
45.0
6
8
8
AT1025
10
208
7,511
25,600
36.1
5,000
2
6
42.1
52.6
60.0
6
6
8
AT1226
12
208
9,013
30,800
43.3
6,000
2
6
49.3
61.7
70.0
4
6
6
“at
” Series - 4 Element
b
oiler
AT1243
12
208
9,013
30,800
43.3
3,000
4
6
49.3
61.7
70.0
4
6
6
AT1644
16
208
12,018
41,000
57.8
4,000
4
6
63.8
79.7
80.0
3
4
4
AT2045
20
208
15,200
51,200
72.2
5,000
4
6
78.2
97.8
100.0
1
3
3
AT2446
24
208
18,027
61,600
86.7
6,000
4
6
92.7
115.8
125.0
1/0
1
2
MCA = M
inimum Circuit A
mpacit
y
MOP = M
aximum Ov
er
-current protection
*R
ecommended Field
Wire
Siz
e
per NEC T
able 310.16
Not more tha
n
thr
ee (3) current carrying conductors in
ra
cew
ay
Based
on
ambient temper
ature of
30ºC
(86ºF).
Othe
r
ambient temper
atures
see NEC or
CEC
for
correction
factors.
Use Copper conductors only
.
Recommended
use only
Class B
or C t
ype wire
(see
Table
B).
Check
with
latest v
ersion
of
NEC and local codes. UL
-834, Section
14.2
Assum
ing 60ºC (140ºF) wire will be used for
conne
ctions
to boiler r
ated
at
80 a
mperes or
less, and
75ºC (167ºF) wire
will be used with
boiler
rated a
t
more than
80
amperes.
Table A