Please Read Before Proceeding - A.O. Smith APW015DW Installation & Service Manual

Please read before proceeding

Installer – Read all instructions, including
⚠WARNING
this manual before installing. Perform
steps in the order given.
User – This manual is for use only
by a
service technician. Refer to the User's
Information Manual for your reference.
Have this Indirect Plate Water Heater
(APW) serviced/inspected by a qualified
service technician, at least annually.
Failure to comply with the above could
result in severe personal injury, death or
substantial property damage.
When calling or writing about the APW
NOTICE
– Please have the APW model and serial
number from the rating label.
Consider piping and installation when
determining APW location.
Any claims for damage or shortage in
shipment must be filed immediately
against the transportation company by
the consignee.
Factory warranty (shipped with unit) does
not apply to units improperly installed or
improperly operated.
Failure to adhere to the guidelines on this
⚠WARNING
page can result in severe personal injury,
death, or substantial property damage.
Indirect Plate Water Heater Installation & Service Manual
qualified heating installer/
General information –
This instruction manual provides detailed coverage for the
Indirect Plate Water Heater (APW). Each APW is equipped
with an electronic control system specifically designed for
an electronic control valve. This control system and valve
combination can be used with all models and sizes of APW
water heaters. The APW is available in the following double-
wall heat exchanger models:
• Double-Wall Models
APW015DW, 030DW, 050DW, 070DW, 090DW,
105DW, and 120DW
A typical packaged APW water heater with a double-wall heat
exchanger is depicted on page 4.
Identical electronic control systems are used on all APW
models. This system contains a control box assembly which
includes all of the electronic circuitry for the electronic
control system. In addition, the electronic control system
includes several sensors and safety devices which provide
temperature and flow control information to the control box
circuitry. The additional devices included in the electronic
control are as follows:
• DHW Inlet Temperature Sensor (RTD)
• DHW Outlet Temperature Sensor (RTD)
• Over-Temperature Switch (With Safety Shutdown)
If desired, the ModBus communication option permits the
electronic control system to be externally controlled by an
Energy Management System (EMS), Building Automation
System (BAS), or computer supplied by other manufacturers.
3