A.O. Smith 101 Series User Manual

15
Table 4. Allowable Ampacities of Insulated Conductors
1
Size
Temperature Rating of Conductor
Size
140 °F
(60 °C)
167 °F
( 75 °C)
185 °F
(85 °C)
(194 °F)
(90 °C)
140 °F
(60 °C)
167 °F
( 75 °C)
185 °F
(85 °C)
194 °F
(90 °C)
AWG MCM
Types
RUW,
TTW,
and UF
Types
FEPW,
H,
RHW,
RUH,
HW,
THWN,
XHHW,
USE,
and
ZW
Types
V, and
MI
Types
TA,
TBS,
SA,
AVB,
SIS,
EP
2
,
FEPB
2
,
RHH
2
,
THHN
2
,
and
XHHW
2,
3
Types
RUW,
TTW,
and UF
Types
RH,
RHW,
RUH,
THW,
THWN,
XHHW,
and
USE
Types
V, and
MI
Types
TA,
TBS,
SA,
AVB,
SIS,
RHH
2
,
THHN
2
,
and
XHHW
2,
3
AWG
MCM
Copper Aluminum or Copper-Clad Aluminum
Correction Factors
Ambient Temp
°C
For ambient temperatures over 30 °C, multiply the ampacities shown above
by the appropriate correction factor to determine the maximum allowable load
current.
Ambient
Temp °F
31-40 .82 .88 .90 .91 .82 .88 .90 .91 86-104
41-50 .58 .75 .80 .82 .58 .75 .80 .82 105-122
51-60 .... .58 .67 .71 .... .58 .67 .71 123-141
61-70 .... .35 .52 .58 .... .35 .52 .58 142-158
71-80 .... .30 .41 .... .... .30 .41 159-176
1. Not more than three conductors in raceway, cable, or earth (directly buried), based on ambient temperature of
86°F (30°C).
2. +The load current rating and the over-current 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.
3. *For dry locations only. See 167 °F (75°C) column for wet locations.
Table taken from the National Electric Code, NFPA 70 (United States))
AMPERAGE TABLE/OVER-CURRENT PROTECTION
The rating of the over-current protection must be computed on
the basis of 125% of the total connected load amperage. Where
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 identied
in Diagrams 1 and 2. The model and rating plate illustration identies
heater circuit ratings. See Model And Rating (page 10). The Electronic
Control model has two electrical circuits.
• The control circuit, which controls the electrical power to
heating elements, referring the following control circuit
diagram Figure 17 (page 40).
• The power circuit, which is operated by the control circuit
carries the electrical load of the heating elements. The
following describes the heater circuits and includes wiring
diagrams for Delta conguration, refer to the Y- conguration
diagrams Figure 23 (page 46) and Figure 24 (page 47)
for water heaters operating at 380 V / 400 V / 415 V / 575
V. All heater circuits are designed for 50/60 cycle alternating
current.
CONTROL CIRCUIT - ELECTRONIC CONTROL MODELS
These models are equipped with an electronic control system. The
system includes a CCB (Central Control Board) circuit board, an
immersion temperature probe with ECO for temperature sensing
and limiting, a UIM (User Interface Module) for user interface &
information display and element current sensors for monitoring the
power circuits. Refer to the control circuit label on the water heater
for details. The CCB is powered by a small 120 V / 24 V transformer.
The control circuit operates on 120 V supplied by a larger 100 VA
transformer. Standard equipment includes control circuit fusing using
two, 3 amp, class G fuses with 600 volt rating. Do not substitute
fuses of a di󰀨erent rating.
Printed on 5/6/2022 7:17 AM CT

A.O. Smith 101 Series Specifications

General

Brand	A.O. Smith
Model	101 Series
Category	Water Heater
Language	English