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A.O. Smith
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AHPW-25
A.O. Smith AHPW-25 Installation & Service Manual
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12
3
Hydronic piping
DIR #20005775360
TEMPERA
TURE GAUGE
FLOW INDICA
TO
R
BALANCING
VA
LV
E
PUMP
EXP
ANSION
TA
NK
RELIEF
VA
LV
E
ACCUMULA
TO
R
TA
NK
COLD
WA
TER SUPPL
Y
HOT
WA
TER SUPPL
Y
BOILER
WA
TER
IN
BOILER
WA
TER
OUT
BUILDING RETURN
Figure 3-5
Water to Water Heat Exchanger Single Unit with Accumulator Tank
Please note that these illustrations are meant to show system piping concept only, the installer is responsible
for all equipment and detailing required by local codes.
NOTICE
Indirect Plate Water Heater Installation & Service Manual
11
13
Table of Contents
Hazard Definitions
2
Table of Contents
2
Please Read before Proceeding
3
The APW - How It Works
4
1 Determine Apw Location
5
Before Locating the Appliance, Check
5
Site Selection and Preparation
5
Installation Clearances
5
APW Water Heater Clearances
6
2 Prepare Water Heater
7
Receiving and Unpacking the APW
7
Setting the Unit
7
3 Hydronic Piping
8
APW Piping Assemblies
8
General Piping Information
8
Heating Fluid and Domestic Hot Water (DHW) Piping
8
Scalding
8
Hydronic Piping Illustrations
9
4 Adjustments
15
3-Way Control Valve Adjustment
15
Control Valve Calibration and Status Indications
15
Manual Control of 3-Way Valve
16
Temperature Controller Operating Controls
18
5 Operating Information
19
Sequence of Operation
19
Electronic Control Overview
19
Over-Temperature Control and Safety Features
19
6 Wiring
20
Electrical Wiring Connections
20
7 Modbus
21
Installation Procedure
21
Modbus Eexception Codes
22
Primary Data Tables
23
Memory Map
23
Physical Wiring
23
Procedure to Change Modbus Address
24
Troubleshooting
24
8 START-UP Introduction
25
Pre-Operational Checks and Procedures
25
Initial Start-Up
25
Checking Mixed Inlet Temperature
26
Shutting down the System
26
9 MAINTENANCE Maintenance and Annual Startup
27
Periodic Cleaning of Heat Exchanger
28
Strainers - Inspection and Replacement
28
Oiled Bearing Circulators
28
Check Water Heater Relief Valve
28
10 Troubleshooting
29
Checking Temperature Sensors
30
11 Sizing Data
31
How to Properly Size Your Indirect Water Heater
31
12 Diagrams
39
Wiring Diagram
39
13 Replacement Parts List
40
When Ordering Replacement Parts
40
Revision Notes
44
Other manuals for A.O. Smith AHPW-25
Instruction Manual
120 pages
Installation And Operating Manual
56 pages
Service Handbook
84 pages
User's Information Manual
44 pages
4
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A.O. Smith AHPW-25 Specifications
General
Brand
A.O. Smith
Model
AHPW-25
Category
Water Heater
Language
English
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