A.O. Smith APW015DW User Manual

19
THERMOSTAT SETTINGS - SURFACE MOUNT CONTROL
Adjustment of temperature controls on surface mounted controls is
to be performed by a qualied service agent at initial start-up.
Water temperature over 125°F (52°C)
can cause severe burns instantly
resulting in severe injury or death.
Children, the elderly and the
physically or mentally disabled are at
highest risk for scald injury.
Feel water before bathing or shower-
ing.
Temperature limiting devices such as
thermostatic point-of-use mixing
valves must be installed when
required by codes and to ensure safe
temperatures at fixtures.
These models have multiple thermostat/ECO combination controls
one for each heating element installed. These thermostats are set
from the factory at 140°F/60°C. Set the thermostat dial at the lowest
setting which produces an acceptable hot water supply. This will
always give the most energy e󰀩cient operation.
The water heater is supplied with thermostats that may come from
di󰀨erent manufactures and have di󰀨erent temperature indications
as described below.
Thermodisc Thermostats
Thermodisc thermostats are adjustable from approximately 120°F
(49°C) (lowest setting) to 181°F (83°C) (highest setting). See Figure
8. These thermostats are set from the factory at approximately the
140°F (60°C) setting. The over-temperature device (ECO high limit)
attached to each thermostat has a manual reset.
APCOM Thermostats
Apcom thermostats have three designated set points; LO, MED and
HI. See Figure 9. The approximate equivalent temperatures for these
three settings are: LO = 140°F (60°C), MED = 160°F (71°C) and HI
= 181°F (83°C). These thermostats are set from the factory at the
LO 140°F (60°C) setting. The over-temperature device (ECO high
limit) attached to each thermostat has a manual reset.
Figure 8. Thermodisc
Thermostat
APCOM
INC
40A 120-277 VAC
25A.480 VAC
125VA.PT.DTY.
120-480 VAC
MED
LO
HI
MODEL WH19HC
30A 120-250 VAC
22A 277 VAC
12.5A 480VAC
125 VA.PT.DTY. 120-480 VAC
Figure 9. Apcom
Thermostat
Table 5 (page 18) shows the approximate time-to-burn relationship
for normal adult skin.
Adjustment of temperature controls on surface mounted controls is
to be performed by a qualied service agent at initial start-up.
THERMOSTAT SETTINGS - ELECTRONIC CONTROLS
Water temperature over 125°F (52°C)
can cause severe burns instantly
resulting in severe injury or death.
Children, the elderly and the
physically or mentally disabled are at
highest risk for scald injury.
Feel water before bathing or shower-
ing.
Temperature limiting devices such as
thermostatic point-of-use mixing
valves must be installed when
required by codes and to ensure safe
temperatures at fixtures.
These models are equipped with an electronic control system.
The control system senses temperature from a factory installed
Immersion Temperature Probe. See Figure 10.
The “Operating Set Point” is adjusted to control water temperature.
This is an adjustable user setting in the control system’s
“Temperatures Menu.” This and all control system menus are
accessed through the user interface module (UIM) located on front
panel of water heater. See Figure 10.
The Operating Set Point is adjustable from 90°F/42°C to 190°F/88°C.
The factory setting is 120°F/49°C. (The factory setting for SASO
compliant units is 140°F/60°C). See Control System Operation (page
20) for instructions on how to adjust the Operating Set Point and
other user settings.
Figure 10. User Interface Module
Set the Operating Set Point at the lowest setting which produces an
acceptable hot water supply. This will always give the most energy
e󰀩cient operation.
CONTROL SYSTEM FEATURES
Advanced Diagnostics: Plain English text and animated icons
display detailed operational and diagnostic information. LCD screen
on the front of the water heater displays the Sequence of Operation
in real time. Fault or Alert messages are displayed when operational
problems occur. Advanced Service menu displays a list of possible
causes for current Fault and Alert conditions to aid in servicing.
Economy Mode Operation: Control system automatically lowers
the Operating Set Point by a programmed value during user dened
time periods. Helps reduce operating costs during unoccupied or
peak demand periods.
Linear Sequencing: Banks of heating elements (3 elements per
bank) are energized according to adjustable (1 to 20°) di󰀨erential
set points for each bank. First bank on is the last bank o󰀨. Helps
reduce operating costs during low/moderate loads.
Printed on 5/6/2022 7:17 AM CT

A.O. Smith APW015DW Specifications

General

Brand	A.O. Smith
Model	APW015DW
Capacity	15 gallons
Voltage	120V
Wattage	1440W
Energy Factor	0.95
Power Source	Electric
Type	Electric
Warranty	6 years