Lochinvar 100 Series Instruction Manual page 15

Not More Than Three Conductors in Raceway or Cable or Earth (Directly Buried), Based on Ambient Temperature of 30°C (86°F)
Size
60°C
(140°F)
AWG
TYPES
RUW, T
MCM
TW, UF
6 55
4 70
3 80
2
1
0
00
000
0000
250
300
350
400
500
Ambient
For ambient temperatures over 30°C, multiply the ampacities shown by the appropriate correction factor to deter-
Temperature
mine the maximum allowable load current.
°C
31-40 .82
41-50 .58
51-60 ......
61-70 ......
71-80 ......
+ The load current rating and the overcurrent protection for these conductors shall not exceed 15 amperes for 14 AWG. 20 amperes for 12 AWG.
and 30 amperes for 10 AWG copper; or 15 amperes for 12 AWG and 25 amperes for 10 AWG aluminum and copper-clad aluminum.
* For dry locations only. See 75°C column for wet locations.
KW Number Of
Input Elements
6
9
12
3
13.5
15
18
18
24
27 6
30
36
36
40.5
9
45
54
Amperage Table/Over-current Protection
The tables above provides the total connected heating element
load in amperes for branch circuit conductor and over-current
protection sizing. Single-phase heaters are two wire circuits. Three-
phase heaters are three wire circuits. In addition to the foregoing, a
grounded conductor is required.
The rating of the over-current protection must be computed on
the basis of 125% of the total connected load amperage. Where
Table 3. Allowable Ampacities of Insulated Conductors
75°C 85°C
(167°F) (185°F)
TYPES
FEPW
RH, RHW
RUH, TYPES
THW, V, MI
THWN,
XHHW
USE, ZW
COPPER
65 70
85 90
100 105
115 120
130 140
150 155
175 185
200 210
230 235
255 270
285 300
310 325
335 360
380 405
.88 .90
.75 .80
.58 .67
.35 .52
...... .30
Element
Single Phase
wattage
208V 240V
2000 29 25
3000 44 38
4000 58 50
4500 65 57
5000 73 63
6000 - - - 75
3000 87 - - -
4000 116 100
4500 130 113
5000 145 125
6000 - - - 150
4000 173 - - -
4500 195 169
5000 217 188
6000 - - - 225
Temperature Rating of Conductor
90°C 60°C
(194°F) (140°F)
TYPES
TA, TBS
SA, AVB
TYPES
SIS, =FEP,
RUW, T
=FEPB,
TW, UF
=RHH,
=THHN,
=XHHW*
70 40
90 55
105 65
120 75
140
155
185
210
235
270
300
325
360
405
CORRECTION FACTORS
.91 .82
.82 .58
.71 ......
.58 ......
.41 ......
Table 4. Standard kW Inputs
Full Load Current In Amperes
277V 480V 208V
22 13 17
33 19 25
44 25 34
49 29 38
55 32 42
65 38 - - -
- - - - - - 50
87 50 67
98 57 75
109 63 84
130 75 - - -
- - - - - - 100
147 85 113
163 94 125
195 113 150
the standard ratings and settings do not correspond with this
computation, the next higher standard rating or setting should be
selected.
Heater Circuits - Electronic Control Models
The water heater's electrical components are pictured and identified
in Figure 1 (page 8) and Figure 2 (page 9). The model and
rating plate illustration on page 4 identifies heater circuit ratings. The
electronic control model has two electrical circuits:
75°C 85°C
(167°F) (185°F)
TYPES
RH, RHW
RUH
TYPES
THW,
V, MI
THWN
XHHW,
USE
ALUMINUM OR COPPER-CLAD ALUMINUM
50 55
65 70
75 80
90 95
100 110
120 125
135 145
155 165
180 185
205 215
230 240
250 260
270 290
310 330
.88 .90
.75 .80
.58 .67
.35 .52
...... .30
Number ot
Three Phase
240V 480V Thermostats
15 8
22 11
29 15
33 17
37 18
44 22
- - - - - -
58 29
65 33
73 37
87 44
- - - - - -
98 49
109 55
130 65
Commercial Electric Water Heaters • 15
Installing the Water Heater
Size
90°C
(194°F)
TYPES
TA, TBS,
SA, AVB AWG
SIS,
=RHH, MCM
=THHN,
=XHHW*
55 6
70 4
80 3
95 2
110 1
125 0
145 00
165 000
185 0000
215 250
240 300
260 350
290 400
330 500
Ambient
Temperature
°F
.91 86 –104
.82 105–122
.71 123–141
.58 142–158
.41 159–176
Number of
Fuses
3 6
6 12
9 18