AERCO Innovation 1060 User Manual
Innovation Water Heaters Installation, Operation & Maintenance Manual
Benchmark 3000
USER MANUAL
INNOVATION Series
Natural Gas or Propane
Modulating, Condensing
Water Heater Models
Applicable to Serial Numbers:
G-13-1854 and above
Other documents for this product
include:
• GF-5030 INN Gas Supply Guide
• GF-5050 INN Venting Guide
• GF-5060 INN El ect. Power Guide
• GF-5080 INN Sizing Guide
Latest Update: 11/22/2013
Installation, Opera ti on and Maintenance
Gas-Fired Water Heaters
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Innovation Water Heaters Installation, Operation & Maintenance Manual
Technical Support
(Mon-Fri, 8am-5pm EST)
1-800-526-0288
www.aerco.com
Disclaimer
The information containe d in this manual is subject to c hange without notice from AERCO Inter national,
Inc. AERCO makes no warranty of any kind with respect to this material, including but not limited to
implied warranties of merchantabilit y and fitness for a par ticular application. AERCO International is not
liable for errors appearing in this manual. Nor for incidental or consequential damages occurring in
connection with the furnishing, performance, or use of this material.
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Innovation Water Heaters Installation, Operation & Maintenance Manual
TABLE OF CONTENTS
FOREWORD ............................................................................................................................................. 7
CHAPTER 1. SAFETY PRECAUTIONS ......................................................................................... 13
1.1 WARNINGS & CAUTIONS ..................................................................................................13
1.2 EMERGENCY SHUTDOWN ...............................................................................................14
1.3 PROLONGED SHUTDOWN ...............................................................................................15
CHAPTER 2. INSTALLATION ........................................................................................................ 17
2.1 INTRODUCTION.................................................................................................................17
2.2 RECEIVING THE UNIT .......................................................................................................17
2.3 UNPACKING .......................................................................................................................17
2.4 SITE PREPARATION .........................................................................................................18
2.4.1 Installation Clearances ................................................................................................................... 18
2.4.2 Setting the Unit .............................................................................................................................. 19
2.5 WATER INLET AND OUTLET PIPING ................................................................................20
2.5.1 WHM Actuator-Controlled Ball Valve Installation.......................................................................... 20
2.6 TEST HOSE BIB CONNECTION ........................................................................................21
2.7 SYSTEM RECIRCULATION LOOP.....................................................................................22
2.8 PRESSURE & TEMPERATURE RELIEF VALVE INSTALLATION .....................................24
2.9 CONDENSATE DRAIN & PIPING .......................................................................................24
2.10 GAS SUPPLY PIPING ......................................................................................................26
2.10.1 Gas Supply Specifications. ............................................................................................................ 26
2.10.2 Manual Gas Shutoff Valve ............................................................................................................ 26
2.10.3 External Gas Supply Regulator ..................................................................................................... 27
2.11 AC ELECTRICAL POWER WIRING ..................................................................................28
2.11.1 Electrical Power Requirements .................................................................................................... 28
2.12 FIELD CONTROL WIRING ...............................................................................................29
2.12.1 OUTDOOR AIR IN Terminal ........................................................................................................... 30
2.12.2 COMBUSTION AIR Terminals ........................................................................................................ 30
2.12.3 O2 SENSOR Terminals .................................................................................................................. 31
2.12.4 SPARK SIGNAL Terminals .............................................................................................................. 31
2.12.5 ANALOG IN Terminals................................................................................................................... 31
2.12.6 B.M.S. (PWM) IN Terminals .......................................................................................................... 31
2.12.7 SHIELD Terminals .......................................................................................................................... 31
2.12.8 ANALOG OUT Terminals ............................................................................................................... 31
2.12.9 RS485 Comm Terminals ............................................................................................................... 32
2.12.10 RS232 Comm Terminals ............................................................................................................. 32
2.12.11 VFD/BLOWER Terminals ............................................................................................................. 32
2.12.12 Interlock Terminals ..................................................................................................................... 32
2.12.13 FAULT RELAY Terminals .............................................................................................................. 33
2.12.14 AUX RELAY Terminals ................................................................................................................. 33
2.13 FLUE GAS VENT INSTALLATION ....................................................................................33
2.14 COMBUSTION AIR ...........................................................................................................34
2.14.1 Combustion From Outside the Building ....................................................................................... 34
2.14.2 Combustion Air from Inside the Building ..................................................................................... 34
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2.15 DUCTED COMBUSTION ..................................................................................................34
CHAPTER 3. OPERATION .............................................................................................................. 35
3.1 INTRODUCTION.................................................................................................................35
3.2 CONTROL PANEL DESCRIPTION .....................................................................................35
3.3 CONTROL PANEL MENUS ................................................................................................39
3.3.1 Menu Processing Procedure .......................................................................................................... 39
3.4 OPERATING MENU ...........................................................................................................41
3.5 SETUP MENU ....................................................................................................................41
3.6 CONFIGU R ATION MENU ...................................................................................................42
3.7 WATER HEATER MANAGEMENT (WHM) MENU ..............................................................43
3.8 TUNING MENU ...................................................................................................................44
3.9 START SEQUENCE ...........................................................................................................45
3.10 START/STOP LEVELS .....................................................................................................48
CHAPTER 4. INITIAL START-UP .................................................................................................. 49
4.1 INITIAL START-UP REQUIREMENTS ................................................................................49
4.2 TOOLS AND INSTRUMENTATION FOR COMBUSTION CALIBRATION...........................49
4.2.1 Required Tools & Instrumentation ................................................................................................. 49
4.2.2 Installing Gas Supply Manometer .................................................................................................. 50
4.2.3 Accessing the Analyzer Probe Port ................................................................................................. 50
4.2.4 Connecting Multimeter to Flame Detector .................................................................................... 51
4.3 NATURAL GAS COMBUSTION CALI BRAT IO N .................................................................52
4.4 PROPANE COMBUSTION CALIBRATION .........................................................................55
4.5 REASSEMBLY ....................................................................................................................57
4.6 TEMPERATURE CONTROL CALI BRAT ION ......................................................................57
4.6.1 Setting the Outlet Water Temperature Setpoint ........................................................................... 58
4.6.2 Minimum Load Adjustment ............................................................................................................ 58
4.6.3 Maximum Load Adjustment ........................................................................................................... 59
4.7 OVER-TEMPERATURE LIMIT SWITCHes .........................................................................60
CHAPTER 5. MODE OF OPERATION ........................................................................................... 61
5.1 INTRODUCTION.................................................................................................................61
5.2 LOW GAS PRESSURE FAULT TEST .................................................................................61
5.3 HIGH GAS PRESSURE FAULT TEST ................................................................................62
5.4 LOW WATER LEVEL FAULT TEST ....................................................................................63
5.5 WATER TEMPERATURE FAULT TEST .............................................................................63
5.6 INTERLOCK TESTS ...........................................................................................................64
5.6.1 Remote Interlock ............................................................................................................................ 64
5.6.2 Delayed Interlock ........................................................................................................................... 65
5.7 FLAME FAULT TESTs ........................................................................................................65
5.8 AIR FLOW FAULT TESTS ..................................................................................................66
5.9 SSOV PROOF OF CLOSURE SWITCH .............................................................................68
5.10 PURGE SWITCH OPEN DURING PURG E .......................................................................69
5.11 IGNITION SWITCH OPEN DURING IGNITION.................................................................69
5.12 SAFETY PRESSURE RELIEF VALVE TEST ....................................................................70
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Innovation Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 6. MAINTENANCE ......................................................................................................... 71
6.1 MAINTENANCE SCHEDULE ..............................................................................................71
6.2 IGNITER 72
6.3 FLAME DETECTOR ...........................................................................................................74
6.4 COMBUSTION CALIBRATION ...........................................................................................74
6.5 SAFETY DEVICE TESTING ...............................................................................................74
6.6 FIRESIDE INSPECTION .....................................................................................................74
6.7 WATERSIDE INSPECTION ................................................................................................79
6.8 HEAT EXCHANGER CLEANING ........................................................................................80
6.8.1 Pumping System Set-Up Instructions ............................................................................................. 80
6.8.2 Cleaning Procedure ........................................................................................................................ 82
6.8.3 Testing HydroSkrub Effectiveness .................................................................................................. 82
6.9 CONDENSATE DRAIN TRAP .............................................................................................83
6.10 AIR FILTER REPLACEMENT ...........................................................................................84
6.11 SHUTTING THE WATER HEATER DOW N FOR AN EXTENDED PERIOD OF TIME ......85
6.12 PLACING THE HEATER BACK IN SERVICE AFTER A PROLONGED SHUTDOWN ......86
CHAPTER 7. TROUBLESHOOTING GUIDE ................................................................................ 87
7.1 INTRODUCTION.................................................................................................................87
7.2 ADDITIONAL FAULTS WITHOUT SPECIFIC FAULT MESSAGES ....................................99
CHAPTER 8. RS232 COMMUNICATION .................................................................................. 103
8.1 INTRODUCTION............................................................................................................... 103
8.1.1 Acquiring the PuTTY Application .................................................................................................. 103
8.1.2 Logging on to a Remote Machine Using PuTTY ............................................................................ 103
8.1.3 Running a Command on a Remote Machine Using PuTTY ........................................................... 104
8.2 RS232 COMMUNICATION SETUP................................................................................... 105
8.3 MENU PROCESSING UTILIZING RS23 2 COMMUNI CATION ......................................... 105
8.4 DATA LOGGING ............................................................................................................... 106
8.4.1 Fault Log ....................................................................................................................................... 106
8.4.2 Operation Time Log ...................................................................................................................... 107
8.4.3 Sensor Log .................................................................................................................................... 107
CHAPTER 9. WATER HEATER MANAGEMENT .................................................................... 109
9.1 INTRODUCTION............................................................................................................... 109
9.2 GENERAL DESCRIPTION ................................................................................................ 109
9.3 WHM Principles of Operation ............................................................................................ 110
9.4 WHM MENU ..................................................................................................................... 110
9.5 WHM hardware INSTALLATION & SET-UP INSTRUCTIONS .......................................... 111
9.5.1 Hardware Installation ................................................................................................................... 111
9.5.2 WHM Modbus Network Wiring .................................................................................................... 112
9.5.3 Control and Power Wiring ............................................................................................................ 113
9.6 WHM MENU SETTINGS ................................................................................................... 114
9.6.1 WHM Mode .................................................................................................................................. 114
9.6.2 Comm Address (Located in Setup Menu) ..................................................................................... 114
9.6.3 WHM Setpoint .............................................................................................................................. 114
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9.6.4 WHM Nxt On VP ........................................................................................................................... 114
9.6.5 WHM Nxt Off VP ........................................................................................................................... 114
9.6.6 Lead/Lag Hours ............................................................................................................................. 114
9.6.7 Setback Setpoint ........................................................................................................................... 114
9.6.8 Setback Start & Setback End ........................................................................................................ 115
9.6.9 WHM Auto Mstr ........................................................................................................................... 115
9.6.10 WHM Auto Timer ....................................................................................................................... 115
9.7 WHM PROGRAMMING & START-UP .............................................................................. 115
9.8 TROUBLESHOOTING ...................................................................................................... 117
9.9 SEQUENCING VALVE DESCRIPTION & OPERATION ................................................... 118
9.9.1 Sequencing Valve Description ...................................................................................................... 118
9.9.2 Sequencing Valve Operating Characteristics ................................................................................ 120
APPENDIX A – INNOVATION MENU ITEM DESCRIPTIONS .................................................. 121
APPENDIX B – STARTUP, STATUS AND FAULT MESSAGES ................................................. 127
APPENDIX C – TEMPERATURE SENSOR RESISTANCE/VOLTAGE CHART ...................... 131
APPENDIX D – INNOVATION DEFAULT SETTINGS ................................................................ 133
APPENDIX E – DIMENSIONAL DRAWINGS ................................................................................ 135
APPENDIX F – PARTS LIST DRAWINGS ..................................................................................... 137
APPENDIX G – PIPING DRAWINGS .............................................................................................. 153
APPENDIX H – C-MORE CONTROL PANEL VIEWS .................................................................. 177
APPENDIX I – C-MORE WIRING DIAGRAMS ............................................................................ 179
APPENDIX J – RECOMMENDED SPARES .................................................................................... 187
APPENDIX K – COMBUSTION CALIBRATION (KOREA ONLY) ............................................ 189
APPENDIX L – WARRANTY ........................................................................................................... 193
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Innovation Water Heaters Installation, Operation & Maintenance Manual
FORWARD
FOREWORD
The AERCO Innovation Series Potable Water Heaters are modulating units which represent a
true industry advance that meets the needs of today's energy efficiency and environmental
concerns. Designed for use in any domestic water heating system, each Innovation model
provides precisely-controlled potable water within ±2°F of setpoint, regardless of flow rate.
Innovation’s compact size and varied venting capabilities allow maximum installation flexibility.
The Innovation Series Heaters, with their load tracking controls modulate over a 20:1 turn down
ratio to match the system demand and yield high thermal efficiencies.
Innovation Water Heaters are available in four (4) different sizes ranging from 600,000 BTU/Hr.
Input to 1,350,000 BTU/Hr. Input. In addition, all Innovation Heater sizes now include Water
Heater Management (WHM) software which is built in to the C-More Controllers furnished with
each unit. When the heater is ordered with a Sequencing Valve (SV), up t o eight (8) Innovation
Water Heaters can be controlled by the WHM system utilizing RS485 Modbus protocol. All
available Innovation Water Heater models are listed in the table on the following page. As this
table shows, units can be ordered with Factory Mutual (FM) or Double Block and Bleed
(formerly IRI) Gas Trains with or without Sequencing Valves.
When installed and operated on natural gas in accordance with this Instruction Manual, the
Innovation Series Models covered herein comply with the NOx emission standards outlined in:
• South Coast Air Quality Management District (SCAQMD), Rule 1146.2
• Texas Commission on Environmental Quality (TCEQ), Title 30, Chapter 117,
Rule 117.465
Whether used in singular or modular arrangements, the Innovation Heaters offer the maximum
flexibility in venting with minimum installation space requirements. Innovation’s advanced
electronic controls offer simplified integration with today’s Energy Management Systems.
For service or parts, contact your local sales representative or AERCO International, Inc.
IMPORTANT
Unless otherwise specified, the descriptions and procedures provided in
this Installation, Operation & Maintenance Manual apply to all Innovation
Series Water Heaters.
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Innovation Water Heaters Installation, Operation & Maintenance Manual
Shipping
Weight
INN600
INN600P
Innovation Potable Water Heater, 600,000 BTU/HR
Input, Natural Gas or Propane, FM Gas Train
1,060 lbs.
INN600SVP
Innovation Potable Water Heater, 600,000 BTU/HR
Sequencing Valve
1,080 lbs.
INN600PDBB
Innovation Potable Water Heater, 600,000 BTU/HR
(Formerly IRI) Gas Train
1,085 lbs.
INN600SVPDBB
Innovation Potable Water Heater, 600,000 BTU/HR
(Formerly IRI) Gas Train with WHM Sequencing Valve
1,105 lbs.
INN800
INN800P
Innovation Potable Water Heater, 800,000 BTU/HR
Input, Natural Gas or Propane, FM Gas Train
1,080 lbs.
INN800SVP
Innovation Potable Water Heater, 800,000 BTU/HR
Sequencing Valve
1,100 lbs.
INN800PDBB
Innovation Potable Water Heater, 800,000 BTU/HR
(Formerly IRI) Gas Train
1,095 lbs.
INN800SVPDBB
Innovation Potable Water Heater, 800,000 BTU/HR
(Formerly IRI) Gas Train with WHM Sequencing Valve
1,115 lbs.
INN1060
INN1060P
Innovation Potable Water Heater, 1,060,000 BTU/HR
Input, Natural Gas or Propane, FM Gas Train
1,100 lbs.
INN1060SVP
Innovation Potable Water Heater, 1,060,000 BTU/HR
Sequencing Valve
1,120 lbs.
INN1060PDBB
Innovation Potable Water Heater, 1,060,000 BTU/HR
(Formerly IRI) Gas Train
1,115 lbs.
INN1060SVPDBB
Innovation Potable Water Heater, 1,060,000 BTU/HR
(Formerly IRI) Gas Train with WHM Sequencing Valve
1,135 lbs.
INN1350
INN1350P
Innovation Potable Water Heater, 1,350,000 BTU/HR
Input, Natural Gas or Propane, FM Gas Train
1,150 lbs.
INN1350SVP
Innovation Potable Water Heater, 1,350,000 BTU/HR
Sequencing Valve
1,170 lbs.
INN1350PDBB
Innovation Potable Water Heater, 1,350,000 BTU/HR
(Formerly IRI) Gas Train
1,165 lbs.
INN1350SVPDBB
Innovation Potable Water Heater, 1,350,000 BTU/HR
(Formerly IRI) Gas Train with WHM Sequencing Valve
1,205 lbs.
FORWARD
INNOVATION POTABLE W ATER HEATER MODELS
Part Number Description
INN600SV
INN600DBB
INN600SVDBB
INN800SV
INN800DBB
INN800SVDBB
INN1060SV
Input, Natural Gas or Propane, FM Gas Train with WHM
Input, Natural Gas or Propane, Double Block & Bleed
Input, Natural Gas or Propane, Double Block & Bleed
Input, Natural Gas, or Propane FM Gas Train with WHM
Input, Natural Gas or Propane, Double Block & Bleed
Input, Natural Gas or Propane, Double Block & Bleed
Input, Natural Gas or Propane, FM Gas Train with WHM
INN1060DBB
INN1060SVDBB
INN1350SV
INN1350DBB
INN1350SVDBB
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Input, Natural Gas, or Propane Double Block & Bleed
Input, Natural Gas or Propane, Double Block & Bleed
Input, Natural Gas or Propane, FM Gas Train with WHM
Input, Natural Gas or Propane, Double Block & Bleed
Input, Natural Gas or Propane, Double Block & Bleed
Innovation Water Heaters Installation, Operation & Maintenance Manual
Phrase, Abbreviation
or Acronym
A (Amp)
Ampere
ADDR
Address
AGND
Analog Ground
ALRM
Alarm
ASME
American Society of Mechanical Engineers
AUX
Auxiliary
Building Automation System, often used interchangeably with EMS
(see below)
Baud Rate
Symbol rate, or simply the number of distinct symbol changes
second, unless each symbol is 1 bit long.
BLDG (Bldg)
Building
BTU
British Thermal Unit. A unit of energy approximately equal to the heat
required to raise 1 pound of water 1°F.
CCP
Combustion Control Panel
C-More Controller
(or Control Box)
A control system developed by AERCO and currently used in all
Benchmark, Innovation and KC1000 Series product lines.
CO
Carbon Monoxide
COMM (Comm)
Communication
Cal.
Calibration
CNTL
Control
DBB
Double Block & Bleed. Used to define gas trains containing two
SSOVs and a solenoid operated vent valve. Used interchangeably
with IRI.
DIP
Dual In-Line Package
EMS
Energy Management System; often used interchangeably with BAS
FM
Factory Mutual. Used to define boiler gas trains.
GND
Ground
HDR
Header
HX
Heat Exchanger
Hz
Hertz (Cycles Per Second)
I.D.
Inside Diameter
IGN
Ignition
IGST Board
Ignition/Stepper Board contained in C-More
Box
INN
Innovation Water Heater
INTLK (INTL’K)
Interlock
I/O
Input/Output
FORWARD
Phrases, abbreviations and acronyms used in this manual are listed in the following Table:
PHRASES, ABBREVIATIO NS AND ACRONYMS
Meaning
BAS
(signaling events) transmitted per second. It is not equal to bits per
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Control
Innovation Water Heaters Installation, Operation & Maintenance Manual
Phrase, Abbreviation
or Acronym
I/O Box
Input/Output (I/O) Box currently used on Benchmark, Innovation and
KC1000 Series products
IP
Internet Protocol
IRI
Industrial Risk Insurers. Used to define gas trains containing two
SSOVs and a solenoid operated vent valve.
ISO
Isolated
LED
Light Emitting Diode
LN
Low NOx
MA (mA)
Milliampere (1 thousandth of an ampere)
MAX (Max)
Maximum
MIN (Min)
Minimum
A serial, half-duplex data transmission protocol developed by AEG
Modicon
NC (N.C.)
Normally Closed
NO (N.O.)
Normally Open
NOx
Nitrogen Oxide
NPT
National Pipe Thread
O2
Oxygen
O.D.
Outside Diameter
PMC Board
A Primary Micro-Controller (PMC) board is contained in the C-More
Control Box used on all Benchmark units.
PPM
Parts Per Million
PTP
Point-to-Point (usually over RS232 networks)
REF (Ref)
Reference
RES.
Resistive
(or EIA-232)
the RS232 Standard
RS422
(or EIA-422)
A standard for serial, full-duplex (FDX) transmission of data based on
the RS422 Standard
RS485
(or EIA-485)
A standard for serial, half-duplex (HDX) transmission of data based on
the RS485 Standard
RTN (Rtn)
Return
SETPT (Setpt)
Setpoint Temperature
SHLD (Shld)
Shield
SSD
Slave to Slave programming
SSOV
Safety Shut Off Valve
SV
Sequencing Valve (Used with Water Heater Management (WHM)
system)
TEMP (Temp)
Temperature
FORWARD
PHRASES, ABBREVIATIO NS AND ACRONYMS - Continued
Meaning
Modbus®
RS232
A standard for serial, full-duplex (FDX) transmission of data based on
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Innovation Water Heaters Installation, Operation & Maintenance Manual
Terminating Resistor
A resistor placed at each end of a daisy-chain or multi-drop network in
that may cause invalid data in the
communication
VAC
Volts, Alternating Current
VDC
Volts, Direct Current
VFD
Vacuum Fluorescent Display, or Variable Frequency Drive
W
Watt
W.C.
Water Column
WHM
Water Heater Management
FORWARD
PHRASES, ABBREVIATIONS AND ACRON YMS - Continued
order to prevent reflections
µA Micro amp (1 millionth of an ampere)
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Innovation Water Heaters Installation, Operation & Maintenance Manual
FORWARD
(This Page Is Intentionally Blank)
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Innovation Water Heaters Installation, Operation & Maintenance Manual
WARNING
WARNING
WARNING
CHAPTER 1 – SAFETY PRECAUTIONS
CHAPTER 1. SAFETY PRECAUTIONS
1.1 WARNINGS & CAUTIONS
Installers and operating personnel MUST, at all times, observe all safety regulations. The
following warnings and cautions are general and must be given the same attention as specific
precautions included in these instructions. In addition to all the requirements included in this
AERCO Instruction Manual, the installation of units MUST conform with local building codes, or,
in the absence of local codes, ANSI Z223.1 (National Fuel Gas Code Publication No. NFPA-54)
for gas-fired heaters and ANSI/NFPASB for LP gas-fired heaters. Where applicable, the
equipment shall be installed in accordance with the current Installation Code for Gas Burning
Appliances and Equipment, CSA B149.1, and applicable Provincial regulations for the class;
which should be carefully followed in all cases. Authorities having jurisdiction should be
consulted before installations are made.
See pages 15 and 16 for information on installations within the Commonwealth of
Massachusetts.
IMPORTANT
This Instruction Manual is an integral part of the product and must be
maintained in legible condition. It must be given to the user by the installer
and kept in a safe place for future reference.
Read the following restrictions prior to installing the water heater:
1. The water heater can only be used for applications where the chlorine
concentrations Do Not Exceed 4 mg/L which is the Environmental
Protection Agency limit for chlorine concentrations in drinking water.
2. Do Not use this heater for a pool heating application.
DO NOT USE MATCHES, CANDLES, FLAMES, OR OTHER SOURCES
OF IGNITION TO CHECK FOR GAS LEAKS.
FLUIDS UNDER PRESSURE MAY CAUSE INJURY TO PERSONNEL OR
DAMAGE TO EQUIPMENT WHEN RELEASED. BE SURE TO SHUT OFF
ALL INCOMING AND OUTGOING WATER SHUTOFF VALVES.
CAREFULLY DECREASE ALL TRAPPED PRESSURES TO ZERO
BEFORE PERFORMING MAINTENANCE.
ELECTRICAL VOLTAGES UP TO 120 VAC MAY BE USED IN THIS
EQUIPMENT. THEREFO RE THE COVER ON THE UNIT ’S POWER BOX
(LOCATED BEHIND THE FRONT PANEL DOOR) MUST BE INSTALLED
AT ALL TIMES, EXCEPT DURING MAINTENANCE AND SERVICING.
IMPORTANT
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Innovation Water Heaters Installation, Operation & Maintenance Manual
WARNING
CHAPTER 1 – SAFETY PR EC AU TIONS
A DOUBLE-POLE SWITCH MUST BE INST ALLED O N T HE ELECTRICAL
SUPPLY LINE OF THE UNIT. T HE SWIT CH MUST BE INSTALLED IN AN
EASILY ACCESSIBLE POSITION TO QUICKLY AND SAFELY
DISCONNECT ELECTRICAL SERVICE. DO NOT AFFIX SWITCH TO
UNIT SHEET METAL ENCLOSURES.
CAUTION
Many soaps used for gas pipe leak testing are corrosive to metals. The
piping must be rinsed thoroughly with clean water after leak checks have
been completed.
CAUTION
DO NOT use this heater if any part has been under water. Call a qualified
service technician to inspect and replace any part that has been under
water.
1.2 EMERGENCY SHUTDOWN
If overheating occurs or the gas supply fails to shut off, close the manual gas shutoff valve
(Figure 1-1) located external to the unit.
IMPORTANT
The Installer must identify and indicate the location of the emergency
shutdown manual gas valve to operating personnel.
MANUAL GAS SHUT-OFF VALVE
VALVE OPEN
VALVE CLOSED
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Figure 1-1. Manual Gas Shutoff Valve
Innovation Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 1 – SAFETY PRECAUTIONS
1.3 PROLONGED SHUTDOWN
After prolonged shutdown, it is recommended that the startup procedures in Chapter 4 and the
safety device test procedures in Chapter 6 of this manual be performed to verify all systemoperating parameters. If there is an emergency, turn off the electrical power supply to the
AERCO heater and close the manual gas valve located upstream of the unit. The installer must
identify the emergency shut-off device.
IMPORTANT – FOR MASSACHUSETTS INSTALLATIONS
Water heater Installations within the Commonwealth of Massachusetts
must conform to the following requirements:
• Heater must be installed by a plumber or a gas fitter who is licensed within
the Commonwealth of Massachusetts.
• Prior to unit operation, the complete gas train and all connections must be
leak tested using a non-corrosive soap.
• The vent termination must be located a minimum of 4 feet above grade
level. If side-wall venting is used, the installation must conform to the
following requirem ent s extract ed from 248 CMR 5.08 (2):
(a) For all side wall horizontally vented gas fueled equipment installed in every dwelling,
building or structure used in whole or in part for residential purposes, including those owned or
operated by the Commonwealth and where the side wall exhaust vent termination is less than
seven (7) feet above finished grade in the area of the venting, including but not limited to decks
and porches, the following requirements shall be satisfied:
1. INSTALLATION OF CARBON MONOXIDE DET ECTORS. At the time of installation of
the side wall horizontal vented gas fueled equipment, the installing plumber or gasfitter shall
observe that a hard wired carbon monoxide detector with an alarm and battery back-up is
installed on the floor level where the gas equipment is to be installed. In addition, the
installing plumber or gasfitter shall observe that a battery operated or hard wired carbon
monoxide detector with an alarm is installed on each additional level of the dwelling, building
or structure served by the side wall horizontal vented gas fueled equipment. It shall be the
responsibility of the property owner to secure the services of qualified licensed professionals
for the installation of hard wired carbon monoxide detectors.
a. In the event that the side wall horizontally vented gas fueled equipment is installed in
a crawl space or an attic, the hard wired carbon monoxide detector with alarm and
battery back-up may be installed on the next adjacent floor level.
b. In the event that the requirements of this subdivision can not be met at the time of
completion of installation, the owner shall have a period of thirty (30) days to comply with
the above requirements; provided, however, that during said thirty (30) day period, a
battery operated carbon monoxide detector with an alarm shall be installed.
2. APPROVED CARBON MONOXIDE DETECTORS. Each carbon monoxide detector as
required in accordance with the above provisions shall comply with NFPA 720 and be
ANSI/UL 2034 listed and IAS certified.
3. SIGNAGE. A metal or plastic identification plate shall be permanently mounted to the
exterior of the building at a minimum height of eight ( 8) feet above grade directly in line with
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CHAPTER 1 – SAFETY PR EC AU TIONS
the exhaust vent terminal for the horizontally vented gas fueled heating appliance or
equipment. The sign shall read, in print size no less than one-half (1/2) inch in size, "GAS
VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUC TIONS".
4. INSPECTION. The state or local gas inspector of the side wall horizontally vented gas
fueled equipment shall not approve the installation unless, upon inspection, the inspector
observes carbon monoxide detectors and signage installed in accordance with the
provisions of 248 CMR 5.08(2)(a)1 through 4.
(b) EXEMPTIONS: The following equipment is exempt from 248 CMR 5.08(2)(a)1 through 4:
1. The equipment listed in Chapter 10 entitled "Equipment Not Required To Be Vented" in
the most current edition of NFPA 54 as adopted by the Board; and
2. Product Approved side wall horizontally vented gas fueled equipment installed in a room
or structure separate from the dwelling, building or structure used in whole or in part for
residential purposes.
(c) MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM
PROVIDED. When the manufacturer of Product Approved side wall horizontally vented gas
equipment provides a venting system design or venting system components with the equipment,
the instructions provided by the manufacturer for installation of the equipment and the venting
system shall include:
1. Detailed instructions for the installation of the venting system design or the venting
system components; and
2. A complete parts list for the venting system design or venting system.
(d) MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM NOT
PROVIDED. When the manufacturer of a Product Approved side wall horizontally vented gas
fueled equipment does not provide the parts for venting the flue gases, but identifies "special
venting systems", the following requirements shall be satisfied by the manufacturer:
1. The referenced "special venting system" instructions shall be included with the appliance
or equipment installation instructions; and
2. The "special venting systems" shall be Product Approved by the Board, and the
instructions for that system shall include a parts list and detailed installation instructions.
(e) A copy of all installation instructions for all Product Approved side wall horizontally vented
gas fueled equipment, all venting instructions, all parts lists for venting instructions, and/or all
venting design instructions shall remain with the appliance or equipment at the completion of the
installation.
______________________________________
[End of Extracted Information From 248 CMR 5.08 (2)]
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Innovation Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 2 – INSTALLATION
CHAPTER 2. INSTALLATION
2.1 INTRODUCTION
This Chapter provides the descriptions and procedures necessary to unpack, inspect and install
AERCO Innovation Water Heater Models INN600, INN800, INN1060 and INN1350.
2.2 RECEIVING THE UNIT
Each Innovation Water Heating System is shipped as a single crated unit. The shipping weight
is approximately 1200 pounds. The unit must be moved with the proper rigging equipment for
safety and to avoid equipment damage. The unit should be completely inspected for evidence of
shipping damage and shipment completeness at the time of receipt fr om the carrier and before
the bill of lading is signed.
NOTE
AERCO is not responsible for lost or damaged freight. Each unit has a TipN-Tell indicator on the outside of the crate. This indicates if the unit has
been turned on its side during shipment. If the Tip-N-Tell indicator is
tripped, do not sign for the shipment. Note the information on the carrier’s
paperwork and request a freight claim and inspection by a claims adjuster
before proceeding. Any other visual damage to the packaging materials
should also be made clear to the delivering carrier.
2.3 UNPACKING
Carefully unpack the unit taking care not to damage the unit enclosure when cutting away
packaging materials
After unpacking, closely inspect the unit to make sure there is no evidence of damage not
indicated by the Tip-N-Tell indicator. Notify the freight carrier immediately if any damage is
detected.
The following accessories come standard with each unit and are either packed separately within
the unit’s shipping container or are factory installed on the unit:
• Pressure/Temperature Gauge
• ASME Pressure Relief Valve
• Condensate Drain Trap
• 1” Gas Supply Shutoff Valve
If the Innovation Water Heater is equipped for use with the AERCO Water Heater Management
(WHM) system, an actuator-controlled ball valve will also be included with the unit.
When optional accessories are ordered, they may be packed within the unit’s shipping
container, factory installed on the unit, or packed and shipped in a separate container. Any
standard or optional accessories shipped loose should be identified and stored in a safe place
until ready for installation or use.
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50.9"
18"
97.25"
75.25"
18.6"
SEQUENCING
VALVE
30"
24"
24"
24"
4" HIGH PAD
WARNING
CAUTION
CHAPTER 2 – INSTALLATION
2.4 SITE PREPARATION
Ensure that the site selected for installation of the Innovation Water Heater includes:
• Access to AC Input Power at 120 VAC, Single-Phase, 60 Hz @ 20 Amps.
• Access to Natural Gas line at a minimum pressure of 4 inches W.C. or to Propane at a
minimum pressure of 7 inches W.C. with the unit operating at maximum capacity.
2.4.1 Installation Clearances
All Innovation Models are packaged in enclosures having identical exterior dimensions. The unit
must be installed with the prescribed clearances for service as shown in Figure 2-1 (shown with
optional Sequencing Valve). The minimum clearance dimensions, required by AERCO, are
listed below. However, if Local Building Codes require additional clearances, these codes shall
supersede AERCO’s requirements. Minimum acceptable clearances required are as follows:
Sides: 24 inches
Front : 24 inches
Rear: 30 inches
Top: 18 inches
All gas piping, water piping and electrical conduit or cable must be arranged so that t hey do not
interfere with the removal of any panels, or inhibit service or maintenance of the unit.
Ensure that
condensate
assembly is
not located
housekeeping
NOTE
over the
pad.
Figure 2-1. Innovation Water Heater Clearances
KEEP THE UNIT AREA CLEAR AND FREE FR OM ALL COMBUSTIBLE
MATERIALS AND FLAMMABLE VAPORS OR LIQUIDS
While packaged in the shipping container, the unit must be moved by pallet
jack or forklift from the FRONT ONLY.
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.
Innovation Water Heaters Installation, Operation & Maintenance Manual
LIFTING LUGS
CHAPTER 2 – INSTALLATION
FOR MASSACHUSSETTS ONLY
For Massachusetts installations, the unit must be installed by a plumber or
gas-fitter who is licensed within the Commonwealth of Massachusetts. In
addition, the installation must comply with all requirements specified in
Chapter 1 (Safety Precautions), pages 13 and 14.
2.4.2 Setting the Unit
The unit must be installed on a 4 inch to 6 inch housekeeping pad to ensure proper condensate
drainage. Two lifting lugs are provided with the unit and are wire-tied to the top of the heat
exchanger. The top sheet metal cover of the unit must first be removed and the lifting lugs must
be installed as shown in Figure 2-2. USE THESE TW O LUGS TO LIFT AND MOVE THE UNI T.
Remove the top panel from the unit to provide access to the lifting lugs. Remove the four (4) lag
screws securing the unit to the shipping skid. Lift the unit of f the shipping skid and position it on
the 4 inch to 6 inch housekeeping concrete pad (required) in the desired location.
In multiple unit installations, it is important to plan the position of each unit in advance. Sufficient
space for piping connections and future service/maintenance requirements must also be taken
into consideration. All piping must include ample provisions for expansion.
Figure 2-2. Partial Top View Showing Installed Lifting Lugs
IMPORTANT
If the Innovation Water Heater is equipped for use with the C-More W ater
Heater Management (WHM) system, then an actuator-controlled ball valve
will be included with the shipment. If the valve is not already installed on
the water inlet of the unit, refer to section 2.5.1 for installation instructions
prior to connecting inlet piping.
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P&T RELIEF
COLD WATER INLET
DRAIN VALVE
EXHAUST MANIFOLD
AIR INLET
NATURAL GAS INLET
HOT WATER OUTL E T
CHAPTER 2 – INSTALLATION
2.5 WATER INLET AND OUTLET PIPING
The locations of the 2" NPT cold water inlet and hot water outlet piping connections are shown
in Figure 2-3a. Flow rates through the unit are limited to 50 gpm continuous and 75 gpm
intermittent.
Shut-off valves and union connections must be installed in the inlet and outlet lines for
maintenance. The use of dielectric unions is recommended.
NOTE
All piping must be arranged so that it does not interfere with
removal of any covers, inhibit service or maintenance, or prevent
access between the unit and walls, or another unit
.
2” NPT
1” NPT
VALVE
2” NPT
Figure 2-3a. Water Inlet & Outlet Locations
2.5.1 WHM Actuator-Controlled Ball Valve Installation
If the Innovation Water Heater was ordered for use with the C-More Water Heater Management
(WHM) system and the actuator-controlled ball valve is not already installed on t he unit (Figure
2-3b), it will be packed separately within the shipping container. If installation is required,
proceed as follows:
1. Remove the ball valve from its stowed location within the shipping container.
2. Attached the valve to the cold water inlet of the unit using the pipe union and nipple
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WHM Ball Valve Installation
provided.
Innovation Water Heaters Installation, Operation & Maintenance Manual
HEATER DRAIN VALVE
2” NPT UNION
BALL VALVE
2” NPT NIPPLE
CHAPTER 2 – INSTALLATION
WHM Ball Valve Installation – Continued
3. Ensure that the valve is positioned with the actuator enclosure position as shown in Figure
2-3A.
4. AERCO recommends that another pipe nipple and union be attached to the valve inlet
prior to connecting the cold water supply piping.
5. Tighten all pipe connections after the valve is properly positioned.
6. Connect the 3-pin Molex connector on the valve to the mating connector on the Innovation
harness at the rear of the unit.
7. This completes the actuator-controlled ball valve installation.
WITH ACTUATOR
Figure 2-3b. Innovation Water Heater Equipped With Sequencing Valve
2.6 TEST HOSE BIB CONNECTION
A Test Hose Bib connection, upstream of the shut off valve on the hot water outlet, is required
for startup and testing (Figure 2-4). The pipe diameter should be a minimum of 3/4". The Test
Hose Bib cannot be omitted.
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TO DRAIN
TEST
HOT
HOSE
CHAPTER 2 – INSTALLATION
CONNECTION
HOSE BIB
WATER
OUT
Figure 2-4. Test Hose Bib Location
2.7 SYSTEM RECIRCULATION LOOP
The System Recirculation Loop Assembly is located inside the unit enclosure at the rear of the
unit. In order to access this assembly, the right rear middle panel must be removed. Refer to
Figure 2-5. This assembly contains a recirculator pump which connects between the upper hot
water outlet and lower cold water inlet of the unit’s heat exchanger. The purpose of this loop is
to provide feed-forward (FFWD) temperature control by mixing a portion of the hot water outlet
with the cold water inlet of the unit. Temperature sensors located in the hot water outlet and cold
water inlet provide temperature data to the C-More Control System. The Control System utilizes
this data to modulate the fire rate (Air/Fuel Valve position) to precisely maintain the hot water
outlet temperature at the selected setpoint temperature.
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Innovation Water Heaters Installation, Operation & Maintenance Manual
RECIRCULATION
HOT WATER OUTL E T
P&T VALVE
RECIRCULATION
COLD WATER INLET
DRAIN VALVE
CHAPTER 2 – INSTALLATION
LOOP PIPING
PUMP
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REAR VIEW WITH CENTER PANEL; REMOVED
Figure 2-5. Recirculation Loop
NOTE
The maximum working pressure for installations within the Province of
Alberta is 87 psig. Therefore, a pressure & temperat ure relief valve with a
setting of 75 psig/210°F is supplied with Alberta shipments.
Innovation Water Heaters Installation, Operation & Maintenance Manual
COLD WATER
DRAIN VALVE
AIR INLET
EXHAUST MANIFOLD
CONDENSATE DRAIN
CHAPTER 2 – INSTALLATION
2.8 PRESSURE & TEMPERATURE RELIEF VALVE INSTALL ATION
An ASME rated Pressure & Temperature (P&T) Relief Valve is supplied with each Innovation
Water Heater. With the exception of Alberta installations (see above Note), the valve setpoint is
150 psig/210°F. The P&T Relief Valve is installed on the hot water outlet at the top of the
Recirculation Loop Assembly as shown in Figure 2-5. A suitable pipe joint compound should be
used on the threaded connections. Any excess should be wiped off to avoid getting any into the
valve body. The relief valve should be piped to within 12 inches of the floor to pr event injury in
the event of a discharge. The relief outlet piping must be equal to the outlet size of the relief
valve without reduction. No valves, restrictions, or other blockages are allowed in the discharge
line. In multiple unit installations the discharge lines must not be manifolded together. Each
must be individually run to a suitable discharge location.
2.9 CONDENSATE DRAIN & PIPING
The Innovation Water Heater is designed to condense water vapor from the flue products.
Therefore, the installation must have provisions for suitable condensate drainage or collection.
The condensate drain port is located on the exhaust m anif old at t he r ear of the unit (Figure 2-6).
This drain port must be connected to the Condensate Trap (part no. 24060) which is packed
separately within the unit’s shipping container. The Condensate Trap inlet and outlet
connections contain tapped 3/4” NPT ports.
INLET 2” NPT
CONNECTION (3/4” NPT)
PARTIAL REAR VIEW
Figure 2-6. Condensate Drain Connection Location
A sample Condensate Trap installation is shown in Figure 2-7. However, the actual installation
details for the trap will vary depending on the available clearances, housekeeping pad height/
dimensions and other prevailing conditions at the site. The following g eneral guidelines must be
observed to ensure proper condensate drainage:
• The condensate trap inlet (Figure 2-7) must be level with, or lower than the exhaust
• The base of the condensate trap must be supported to ensure that it is level (horizontal).
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manifold drain port.
Innovation Water Heaters Installation, Operation & Maintenance Manual
Housekeeping pad should not extend
CHAPTER 2 – INSTALLATION
• The trap must be removable f or routine maintenance. AERCO recommends t hat a union
be utilized between the exhaust manifold condensate drain port and the trap inlet port.
While observing the above guidelines, install the condensate trap as follows:
Condensate Trap Installation
1. Connect the condensate trap inlet to the exhaust manifold drain connection using the
appropriate piping components (nipples, reducers, elbows, etc.) for the heater installation
site
2. At the condensate trap outlet, install a 3/4” NPT nipple.
3. Connect a length of 1” I.D. polypropylene hose to the trap outlet and secure with a hose
clamp.
4. Route the hose on the trap outlet to a nearby floor drain.
If a floor drain is not available, a condensate pump can be used to remove the condensate to
drain. The maximum condensate flow rate is 20 GPH. The condensate drain trap, associated
fittings and drain line must be removable for routine maintenance.
NOTE
Two different styles of condensate traps are currently in use. The functions
and connections provided by each style are identical however the two
styles look slightly different. Figure 2-7 shows the two styles that are
currently in use.
under the condensate assembly
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Figure 2-7. Sample Condensate Trap Installation
Innovation Water Heaters Installation, Operation & Maintenance Manual
WARNING
CAUTION
CHAPTER 2 – INSTALLATION
2.10 GAS SUPPLY PIPING
The AERCO Innovation Gas Components and Supply Design Guide, GF-5030 must be
consulted prior to designing or installing any gas supply piping.
NEVER USE MATCHES, CANDLES, FLAMES O R OT HER SO URCES OF
IGNITION TO CHECK FOR GAS LEAKS
Many soaps used for gas pipe leak testing are corrosive to metals.
Therefore, piping must be rinsed thoroughly with clean water after leak
checks have been completed.
NOTE
All gas piping must be arranged so that it does not interfere with removal of any
covers, inhibit service/maintenance, or restrict access between the unit and
walls, or another unit.
.
Innovation units contain a 1 inch NPT gas inlet connection on t he rear of the unit as shown in
Figure 2-3.
Prior to installation, all pipes should be de-burred and internally cleared of any scale, metal
chips or other foreign particles. Do Not install any flexible connectors or unapproved gas
fittings. Piping must be supported from the floor, ceiling or walls only and must not be supported
by the unit.
A suitable piping compound, approved for use with natural gas, should be used. Any excess
must be wiped off to prevent clogging of components.
To avoid unit damage when pressure testing gas piping, isolate the unit from the gas supply
piping. At no time should the gas pressure applied to the unit exceed 14” W.C.. Leak test all
external piping thoroughly using a soap and water solution or suitable equivalent. The gas
piping used must meet all applicable codes.
2.10.1 Gas Supply Specifications.
The gas supply input specifications to the unit for Natural Gas are as follows:
• The maximum static pressure to the unit must not exceed 14” W.C.
• The gas supply pressure to the unit must be of sufficient capacity to provide 1060 cfh
while maintaining the gas pressure of 7“ W .C. for FM gas trains operating at ma xi mum
capacity.
2.10.2 Manual Gas Shutoff Valve
A manual shut-off valve must be installed in the gas supply line upstream of the Heater as
shown in Figure 2-8. The maximum allowable gas pressure to the Heater is 14” W.C.
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CHAPTER 2 – INSTALLATION
2.10.3 External Gas Supply Regulator
An external gas pressure regulator is required on the gas inlet piping under most conditions
(see sections 2.10.3.1 and 2.10.3.2, below). Regulators must conform to the following
specifications:
• The external nat ural gas regulator must be capable of regulating 200,000 – 3,180,000
BTU/HR of natural g as while maintaining a gas pressure of 8.0” W .C. minimum to the
unit.
• A lock-up style regulator MUST be used when gas supply pressure will exceed 14” W.C.
2.10.3.1
Massachusetts Installations Only
For Massachusetts installations, a mandatory external gas supply regulator must be
positioned as shown in Figure 2-8. The gas supply regulator must be properly vented to
outdoors. Consult the local gas utility for detailed requirements concerning venting of the
supply gas regulator.
2.10.3.2
All Installations (Except Massachusetts)
For all installations (other than Massachusetts) that EXCEED 7” W.C. gas pressure, a
mandatory external gas supply regulator must be positioned as shown in Figure 2-8. No
regulator is required for gas pressures below 7” W.C. of pressure. Consult the local gas utility
for detailed requirements concerning venting of the supply gas regulator.
Figure 2-8. Manual Gas Shut-Off Valve Location
NOTE
It is the responsibility of the customer to source and purchase the
appropriate gas regulator as described above. However, AERCO
offers for sale an appropriate regulator, which may be ordered at
the time of unit purchase or separately. Contact AERCO for more
information.
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CHAPTER 2 – INSTALLATION
2.11 AC ELECTRICAL POWER WIRING
The AERCO Innovation Electrical Power Wiring Guide, GF-5060, must be consulted prior to
connecting any AC power wiring to the unit. External AC power connections are made to the
unit inside the Power Box on the front of the unit. Remove the front door of the unit to access
the Power Box mounted directly above the Control Box. Loosen the four Power Box cover
screws and remove the cover to access the AC terminal connections inside the Power Box
(Figure 2-9).
NOTE
All electrical conduit and hardware must be installed so that it does not
interfere with the removal of any unit covers, inhibit service/maintenance,
or prevent access between the unit and walls or another unit.
POWER BOX WITH COVER POWER BOX WITH COVER REMOVED
Figure 2-9. Power Box Location – Partial Front View, Front Panel Removed
2.11.1 Electrical Power Requirements
The AERCO Innovation Heater accepts 120 VAC, single-phase, 60 Hz @ 20A. The Power Box
contains a terminal block as shown in Figure 2-10. In addition, a wiring diagram showing the
required AC power connections is provided on the front cover of the Power Box.
Each unit must be connected to a dedicated electrical circuit. NO OTHER DEVICES SHOULD
BE ON THE SAME ELECTRICAL CIRCUIT AS THE HEATER.
A double-pole switch must be installed on the electrical supply line in an easily accessible
location to quickly and safely disconnect electrical service. DO NOT attach the switch to sheet
metal enclosures of the unit.
After placing the unit in service, the ignition safety shutoff device must be tested. If an external
electrical power source is used, the installed boiler must be electrically bonded to ground in
accordance with the requirements of the authority having jurisdiction. In the absence of such
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Innovation Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 2 – INSTALLATION
requirements, the installation shall conform to National Electrical Code (NEC), ANSI/ NFPA 70
and/or the Canadian Electrical Code (CEC) Part I, CSA C22.1 Electrical Code.
For electrical power wiring diagrams, see the AERCO Innovation Electrical Power Wiring Guide,
(GF-5060).
Figure 2-10. AC Terminal Block Configurations
2.12 FIELD CONTROL WIRING
Each unit is fully wired from the factory with an internal operating control system. No field control
wiring is required for normal operation. However, the C-More control system used with all
Innovation Heaters does allow for some control and monitoring features. W iring connections for
these features are made in the Input/Output (I/O) Box. The I/O Box is located on the upper-left
portion of the unit front panel (Figure 2-11) behind the removable front panel door. To access
the I/O Box terminal strips shown in Figure 2-11, loosen the four cover screws and remove the
cover. All field wiring is installed from the rear of the panel by routing t he wires through one of
the four bushings provided.
Refer to the wiring diagram provided on the cover of t he I/O Box (Figure 2-12) when making all
wiring connections.
Figure 2-11. Input/Output (I/O) Box Location – Partial Front View
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CAUTION
CHAPTER 2 – INSTALLATION
Since identical I/O Boxes are used with both AERCO gas-fired boilers and water heaters, some
of the input and output connections apply only to boilers while others are common to both
boilers and heaters. These I/O Box connections are noted in the sections below.
NOTE
Use Figure 2-12 to determine the functions of the I/O PCB connections. Do
not use the silkscreened labels on the PCB itself, as these may not match.
DO NOT make any connections to the I/O Box terminals labeled “NOT
USED”. Attempting to do so may cause equipment damage.
2.12.1 OUTDOOR AIR IN Terminal
The OUTDOOR AIR IN and AIR SENSOR COMMON terminals are not applicable to this unit.
2.12.2 COMBUSTION AIR Terminals
The COMBUSTION AIR and AIR SENSOR COMMON terminals are not applicable to this unit.
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Figure 2-12. I/O Box Terminal Strips
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