Watts PVi CENTURION User manual

@2022 PVI
WARNING: If the information in these instructions is not
followed exactly, a fire or explosion may result causing
property damage, personal injury or death.
Do not store or use gasoline or other flammable vapors
and liquids in the vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
•Do not try to light any appliance.
•Do not touch any electrical switch; do not use any
phone in your building.
•Immediately call your gas supplier from a
neighbor's phone. Follow the gas supplier's
instructions.
•If you cannot reach your gas supplier, call the fire
department.
Installation and service must be performed by a qualified
installer, service agency or the gas supplier.
OMM-0153_A • 8/25/2022
Disclaimer
The information contained in this manual is subject to change without
notice from PVI Industries, LLC. PVI makes no warranty of any kind
with respect to this material, including, but not limited to, implied
warranties of merchantability and fitness for a particular application.
PVI is not liable for errors appearing in this manual, not for incidental
or consequential damages occurring in connection with the
furnishing, performance, or use of these materials.
CENTURION Water Heaters
with Edge®[ii] Controller
Natural Gas Modulating & Condensing
Water Heater Model CEN2000
Installation, Operation and Maintenance Manual

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Installation, Operation & Maintenance Manual
Centurion Water Heater
TABLE OF CONTENTS
TABLE OF CONTENTS...........................................................................................2
FOREWORD 5
SECTION 1: SAFETY PRECAUTIONS......................................................................8
1.1 WARNINGS & CAUTIONS................................................................................................... 8
1.2 EMERGENCY SHUTDOWN................................................................................................ 9
1.3 PROLONGED SHUTDOWN................................................................................................ 9
1.4 IMPORTANT –FOR MASSACHUSETTS INSTALLATIONS...............................................10
SECTION 2: INSTALLATION ...............................................................................12
2.1 RECEIVING THE UNIT.......................................................................................................12
2.2 UNPACKING.......................................................................................................................12
2.3 SITE PREPARATION .........................................................................................................12
2.3.1 Installation Clearances ...................................................................................................................13
2.3.2 Setting The Unit..............................................................................................................................15
2.3.3 Housekeeping Pad Requirements ..................................................................................................15
2.4 LIFTING PROVISIONS.......................................................................................................16
2.5 PIPING CONNECTIONS.....................................................................................................17
2.5.1 Internal Recirculation Water Loop.................................................................................................18
2.5.2 Test Hose Connection.....................................................................................................................19
2.5.3 Dual Inlet Return Piping .................................................................................................................19
2.5.4 Sequencing Isolation Valve.............................................................................................................20
2.6 TEMPERATURE AND PRESSURE RELIEF VALVE INSTALLATION ................................20
2.7 CONDENSATE DRAIN AND PIPING..................................................................................21
2.8 GAS SUPPLY PIPING ........................................................................................................22
2.8.1 Gas Supply Specifications...............................................................................................................23
2.8.2 External Gas Supply Regulator .......................................................................................................23
2.8.3 Massachusetts Installations Only...................................................................................................24
2.8.4 Manual Gas Shutoff Valve..............................................................................................................24
2.9 AC ELECTRICAL POWER WIRING....................................................................................25
2.9.1 Power Panel Locations ...................................................................................................................25
2.9.2 Electrical Power Panel Internal Components.................................................................................25
2.10 FIELD CONTROL WIRING –I/O BOARD.........................................................................26
2.10.1 I/O Board Connections .................................................................................................................28
2.11 FLUE GAS VENT INSTALLATION....................................................................................31
2.11.1 Massachusetts Installations .........................................................................................................31
2.12 COMBUSTION AIR...........................................................................................................32
2.12.1 Ducted Combustion Air ................................................................................................................32
2.13 SEQUENCING ISOLATION VALVE INSTALLATION........................................................32
2.14 WATER HEATER PUMP RELAY......................................................................................34
2.15 NEXT STEPS....................................................................................................................34
SECTION 3: EDGE CONTROLLER OPERATION.....................................................35
3.1 LOGIN AND PASSWORD ENTRY......................................................................................36
SECTION 4: START SEQUENCE...........................................................................37
4.1 START SEQUENCE...........................................................................................................37
4.2 START/STOP LEVELS.......................................................................................................40
4.3 START/STOP LEVELS –AIR/FUEL & ENERGY INPUT.....................................................41
SECTION 5: INITIAL START-UP...........................................................................42

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Installation, Operation & Maintenance Manual
Centurion Water Heater
5.1 INITIAL START-UP REQUIREMENTS................................................................................42
5.2 TOOLS & INSTRUMENTS FOR COMBUSTION CALIBRATION........................................43
5.2.1 Required Tools & Instrumentation.................................................................................................43
5.2.2 Installing Gas Supply Manometer ..................................................................................................43
5.2.3 Accessing The Analyzer Probe Port................................................................................................44
5.2.4 Recommendations For WHM Operation........................................................................................44
5.3 COMBUSTION CALIBRATION...........................................................................................44
5.3.1 Instructions For Combustion Calibration .......................................................................................45
5.3.2 Reassembly.....................................................................................................................................48
5.4 OVER-TEMPERATURE LIMIT SWITCHES........................................................................48
5.4.1 Adjusting The Automatic Reset Limit Switch Temperature ...........................................................49
5.4.2 Resetting The Manual Reset Limit Switch......................................................................................49
5.4.3 Changing The Readout Between Fahrenheit and Celsius...............................................................50
5.5 TEMPERATURE CONTROL CALIBRATION......................................................................50
5.5.1 Setting The Outlet Water Temperature Setpoint...........................................................................50
5.5.2 Minimum Load Adjustment............................................................................................................51
5.5.3 Maximum Load Adjustment...........................................................................................................52
5.6 MODES OF OPERATION...................................................................................................52
5.6.1 Constant Setpoint Mode ................................................................................................................52
5.6.2 Remote Setpoint Mode..................................................................................................................53
SECTION 6: SAFETY DEVICE TESTING.................................................................54
6.1 TESTING SAFETY DEVICES.............................................................................................54
6.2 LOW GAS PRESSURE TEST.............................................................................................55
6.3 HIGH GAS PRESSURE TEST............................................................................................56
6.4 LOW WATER LEVEL FAULT TEST....................................................................................57
6.5 WATER TEMPERATURE FAULT TEST.............................................................................58
6.6 INTERLOCK TESTS...........................................................................................................59
6.6.1 Remote Interlock Test....................................................................................................................59
6.6.2 Delayed Interlock Test....................................................................................................................59
6.7 FLAME FAULT TEST..........................................................................................................60
6.8 AIR FLOW FAULT TESTS-BLOWER PROOF & BLOCKED INLET SWITCHES ................61
6.8.1 Blower Proof Switch Test ...............................................................................................................61
6.8.2 Blocked Inlet Switch Test................................................................................................................62
6.9 SSOV PROOF OF CLOSURE SWITCH CHECK................................................................63
6.10 PURGE SWITCH OPEN DURING PURGE.......................................................................63
6.11 CHECK IGNITION SWITCH OPEN DURING IGNITION...................................................64
6.12 SAFETY PRESSURE RELIEF VALVE TEST....................................................................64
SECTION 7: MAINTENANCE ..............................................................................66
7.1 MAINTENANCE SCHEDULE..............................................................................................66
7.2 IGNITER-INJECTOR ..........................................................................................................67
7.3 FLAME DETECTOR ...........................................................................................................68
7.4 O2SENSOR MAINTENANCE.............................................................................................68
7.5 SAFETY DEVICE TESTING ...............................................................................................69
7.6 BURNER INSPECTION......................................................................................................69
7.7 CONDENSATE DRAIN TRAP.............................................................................................70
7.8 AIR FILTER CLEANING AND REPLACEMENT..................................................................71
7.9 SHUTTING WATER HEATER DOWN FOR EXTENDED PERIOD .....................................72
7.9.1 Returning The Water Heater to Service After Shutdown...............................................................72
7.10 RECOMMENDED PERIODIC TESTING...........................................................................73
7.11 RECOMMENDED SPARE PARTS....................................................................................74

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Installation, Operation & Maintenance Manual
Centurion Water Heater
SECTION 8: WATER HEATER MANAGEMENT.....................................................76
8.1 GENERAL DESCRIPTION..................................................................................................76
8.2 WHM PRINCIPLES OF OPERATION.................................................................................77
8.3 WHM FEATURES...............................................................................................................77
8.3.1 Valve Feedback...............................................................................................................................77
8.3.2 Valve Supervisor.............................................................................................................................77
8.3.3 Temperature Sensor Calibration....................................................................................................78
8.3.4 Manual Mode Password Required.................................................................................................78
8.3.5 Auto-Manager Transfer..................................................................................................................78
8.3.6 Run Hours and Run Cycles..............................................................................................................78
8.3.7 High Temperature Governor..........................................................................................................79
8.4 WHM STATUS DISPLAYS..................................................................................................79
8.5 WATER HEATER MANAGEMENT ALTERNATING STATUS DISPLAYS...........................79
8.6 WHM PARAMETERS .........................................................................................................80
8.7 WHM HARDWARE INSTALLATION & SET-UP INSTRUCTIONS ......................................85
8.7.1 Installation Notes ...........................................................................................................................85
8.7.2 Hardware Installation.....................................................................................................................85
8.7.3 WHM Modbus Network Wiring......................................................................................................85
8.7.4 Control And Power Wiring .............................................................................................................87
8.8 WHM PROGRAMMING & START-UP ................................................................................90
8.8.1 WHM Manager Configuration........................................................................................................90
8.8.2 WHM Client Configuration & Start-Up Procedure .........................................................................91
8.9 TROUBLESHOOTING........................................................................................................92
8.10 SEQUENCING VALVE DESCRIPTION & OPERATION ...................................................92
8.10.1 Sequencing Valve Operating Characteristics................................................................................93
SECTION 9: O2TRIM OPERATION......................................................................94
9.1 O2TRIM INTRODUCTION..................................................................................................94
9.2 OPERATION DETAILS.......................................................................................................95
9.3 O2 SENSOR CALIBRATION...............................................................................................96
9.4 TRIM MENU VALUES AND DEFAULTS.............................................................................96
9.5 TRIM MAINTENANCE AND TROUBLESHOOTING ...........................................................99
SECTION 10: TROUBLESHOOTING...................................................................102
10.1 INTRODUCTION.............................................................................................................102
10.1.1 Fault Correction..........................................................................................................................102
10.2 ADDITIONAL FAULTS WITHOUT SPECIFIC FAULT MESSAGES................................111
APPENDIX A –DIMENSIONS AND CLEARANCE.................................................115
APPENDIX B –WIRING DIAGRAMS..................................................................117
APPENDIX C –CENTURION 2000 PART LIST .....................................................121
APPENDIX D –TEMPERATURE SENSOR RESISTANCE/VOLTAGE CHART............129
NOTES: 130
CHANGE LOG: .................................................................................................131

Centurion Water Heater- Edge [ii]: Install-Operation-Service
FOREWORD
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FOREWORD
The PVI CENTURION natural gas fueled modulating and condensing water heater represents a
true industry advance to meet the needs of today's energy and environmental concerns.
Designed for application in any closed loop hydronic system, the CENTURION's modulating
capability relates energy input directly to fluctuating system loads. CENTURION models provide
extremely high efficiency operation and are ideally suited for modern low temperature, as well
as conventional, water heating systems.
The CENTURION models operate within the following input and output ranges:
CENTURION Water Heater Intake and Output Ranges
MODEL
INPUT RANGE (BTU/HR.)
OUTPUT RANGE (BTU/HR.)
MINIMUM
MAXIMUM
MINIMUM
MAXIMUM
CEN2000
100,000 (29.3 kW)
2,000,000 (586 kW)
98,000 (28.7 kW)
1,920,000 (563 kW)
The output of CENTURION Water Heaters is a function of the unit’s firing rate (valve position)
and return water temperature.
When installed and operated in accordance with this Instruction Manual, the CENTURION 2000
complies with the NOx emission standards outlined in: South Coast Air Quality Management
District (SCAQMD), Rule 1146.2.
Whether used in singular or modular arrangements, CENTURION Water Heaters offer the
maximum venting flexibility with minimum installation space requirements. CENTURION Water
Heaters are Category II and IV, positive pressure appliances. Single and/or multiple breeched
units are capable of operation in the following vent configurations:
•Room Combustion Air:
oVertical Discharge
oHorizontal Discharge
•Ducted Combustion Air:
oVertical Discharge
oHorizontal Discharge
The vent for this appliance shall not terminate:
1. Over public walkways; or
2. Near soffit vents or crawl space vents or other areas where condensate or vapor could
create a nuisance or hazard or cause property damage; or
3. Where condensate vapor could cause damage or could be detrimental to the operation
of regulators, relief valves, or other equipment.
See CSA/ANSI Z21.10.3:19, Figure 2-A and 2-B for vent terminal clearances.
CENTURION Water Heaters are capable of being vented utilizing PVC, CPVC, Polypropylene
and AL29-4C vent systems.
The advanced electronics in CENTURION Water heaters are available in several selectable
modes of operation offering the most efficient operating methods and energy management
system integration.

Centurion Water Heater- Edge [ii]: Install-Operation-Service
FOREWORD
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Technical Terminology Meanings
TERMINOLOGY
MEANING
A (Amp)
Ampere
ADDR
Address
AGND
Analog Ground
ALRM
Alarm
ANSI
American National Standards Institute,
ASME
American Society of Mechanical Engineers
AUX
Auxiliary
BAS
Building Automation System, often used interchangeably with EMS
Baud Rate
Symbol rate, or the number of distinct symbol changes (signaling events) transmitted
per second. It is not equal to bits per second, unless each symbol is 1 bit long.
BLDG (Bldg)
Building
BTU
British Thermal Unit; heat required to raise 1 pound (0.45 kg) of water 1°F (0.55 °C)
BTU/HR
BTUs per Hour (1 BTU/hr. = 0.29 W)
CCS
Combination Control System
CFH
Cubic Feet per Hour (1 CFH = 0.028 m3/hr.)
CO
Carbon Monoxide
COMM
Communication
Cal.
Calibration
CNTL
Control
CPU
Central Processing Unit
DBB
Double Block and Bleed, a gas trains containing 2 Safety Shutoff Valves (SSOVs) and a
solenoid operated vent valve.
DHW
Domestic Hot Water
DIP
Dual In-Line Package, a type of switch
ECU
Electronic Control Unit (O2 sensor)
Edge Controller
A control system currently used in all
CENTURION
Water Heaters.
EMS
Energy Management System; often used interchangeably with BAS
FM
Factory Mutual. Used to define Water Heater gas trains.
GF-xxxx
Gas Fired (a document numbering system)
GND
Ground
HDR
Header
Hex
Hexadecimal Number (0 –9, A –F)
HP
Horsepower
HX
Heat Exchanger
Hz
Hertz (Cycles Per Second)
I.D.
Inside Diameter
IGN
Ignition
IGST Board
Ignition/Stepper Board contained in Edge Controller
INTLK (INTL’K)
Interlock
I/O
Input/Output
I/O Box
Input/Output (I/O) Box currently used on
CENTURION
Water Heaters
IP
Internet Protocol
ISO
International Organization for Standardization
Lbs.
Pounds (1 lb. = 0.45 kg)
LED
Light Emitting Diode
LN
Low Nitrogen Oxide

Centurion Water Heater- Edge [ii]: Install-Operation-Service
FOREWORD
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Technical Terminology Meanings
TERMINOLOGY
MEANING
MA (mA)
Milliampere (0.001)
MBH
1000 BTUs per Hour
Modbus®
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
OMM, O&M
Operation and Maintenance Manual
onAER
An on-line remote monitoring system
PCB
Printed Circuit Board
PMC Board
Primary Micro-Controller (PMC) board, contained in the Edge
P/N
Part Number
POC
Proof of Closure
PPM
Parts per Million
PSI
Pounds per Square Inch (1 PSI = 6.89 kPa)
PTP
Point-to-Point (usually over RS232 networks)
P&T
Pressure and Temperature
ProtoNode
Hardware interface between BAS and a Water Heater
PVC
Poly Vinyl Chloride, a common synthetic plastic
PWM
Pulse Width Modulation
REF (Ref)
Reference
RES.
Resistive
RS232 (EIA-232)
A standard for serial, full-duplex (FDX) data transmission based on RS232 Standard
RS485 (EIA-485)
A standard for serial, half-duplex (HDX) based on the RS485 Standard
RTN (Rtn)
Return
SETPT (Setpt)
Setpoint Temperature
SHLD (Shld)
Shield
SPDT
Single Pole Double Throw, a type of switch
SSOV
Safety Shut-Off Valve
TAC
Turndown Adjustment Control
TEMP (Temp)
Temperature
Terminating
Resistor
A resistor placed at each end of a daisy-chain or multi-drop network in order to
prevent reflections that may cause invalid data in the communication
Tip-N-Tell
A device that indicates if a package was tipped during shipping
UL
A business that tests and validates products
VAC
Volts, Alternating Current
VDC
Volts, Direct Current
VFD
Variable Frequency Drive
VPS
Valve Proving System
W
Watt
WHM
Water Heater Management system
W.C.
Water Column, a unit of pressure (1 W.C. = 249 Pa)
µA
Micro amp (1 millionth of an ampere)

Centurion Water Heater- Edge [ii]: Install-Operation-Service
SAFETY PRECAUTIONS
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SECTION 1: SAFETY PRECAUTIONS
1.1 WARNINGS & CAUTIONS
Installers and operating personnel MUST observe all safety regulations at all times. 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 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 Water Heaters and
ANSI/NFPASB for LP gas-fired Water 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 section 1.4 for important information regarding installation of units within the
Commonwealth of Massachusetts.
I M P O R T A N T !
This 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.
W A R N I N G !
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.
Before attempting to perform any maintenance on the unit, shut off all gas and electrical
inputs to the unit.
The exhaust vent pipe of the unit operates under a positive pressure and therefore must be
completely sealed to prevent leakage of combustion products into living spaces.
Electrical voltages of 208 VAC, 480 VAC, 120 VAC and 24 volts AC, 24 VDC, 12 VDC may be used
in this equipment. Therefore, 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.
A three-pole switch must be installed on the electrical supply line of the unit. The switch must
be installed in an easily accessible position to disconnect electrical service quickly and
safely. Do not affix switch to unit sheet metal enclosures.
C A U T I O N !
The appliance and all gas connections must be leak-tested before operation.
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.
DO NOT use this Water Heater if any part has been under water. Call a qualified service
technician to inspect and replace any part that has been under water.

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SAFETY PRECAUTIONS
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1.2 EMERGENCY SHUTDOWN
If overheating occurs or the gas supply fails to shut off, close the manual shutoff valve (Figure
1-1) on the outside of the unit.
NOTE: The Installer must identify and indicate the location of the emergency shutdown manual
gas valve to operating personnel.
Figure 1-1: External Manual Gas Shutoff Valve
In addition, to ensure safety an emergency shutdown procedure that addresses the following
points should be designed and implemented:
•For automatically operated unattended units located in a Water Heater room, provide a
manually operated remote shutdown switch or circuit breaker located just inside or outside
each Water Heater room door. Design the system so activation of the emergency shutdown
switch or circuit breaker will immediately shut off fuel to the unit(s).
•For automatically operated unattended Water Heaters in a location other than a Water
Heater room, provide a readily accessible manually operated remote shutdown switch or
circuit breaker, marked for easy identification at a location in the event of Water Heater mis-
operation. Design the system so activation of the emergency shutdown switch or circuit
breaker will immediately shut off fuel to the unit(s).
•For Water Heaters monitored and/or operated from a continuously occupied control room,
provide an emergency shutdown switch in the control room that is hard-wired to
immediately shut off the fuel upon activation.
1.3 PROLONGED SHUTDOWN
If there is an emergency, turn the electrical power supply to the Water Heater to OFF and close
the manual gas valve located upstream from the unit. The installer must identify the emergency
shut-off device.
If the unit is being shut down for an extended period of time, such as a year or more, complete
the instructions in SHUTTING WATER HEATER DOWN FOR EXTENDED PERIOD 7.9.
When returning a unit to service after prolonged shutdown, follow the instructions in Sections 6
and 7 to verify that all system-operating parameters are correct.
VALVE OPEN
VALVE
CLOSED

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SAFETY PRECAUTIONS
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1.4 IMPORTANT –FOR MASSACHUSETTS INSTALLATIONS
Requirements for Massachusetts Installations
Water Heater Installations within the Commonwealth of Massachusetts must
conform to the following requirements:
•Water 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
requirements extracted 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 DETECTORS: 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 cannot 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
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 OBSTRUCTIONS". (Continued)
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:

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SAFETY PRECAUTIONS
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Requirements for Massachusetts Installations
1. The equipment listed in Section 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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SECTION 2: INSTALLATION
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SECTION 2: INSTALLATION
2.1 RECEIVING THE UNIT
Each CENTURION Water Heater is shipped as a single, crated unit. The shipping weight for this
model is approximately 1,850 lbs. (839 kg).
The unit must be moved with proper rigging equipment for safety and to avoid damage. The unit
should be completely inspected for evidence of shipping damage and shipment completeness at
the time of receipt from the carrier and before the bill of lading is signed.
C A U T I O N !
While packaged in the shipping container, the unit must be moved by pallet jack or forklift
from the front only.
NOTE: PVI is not responsible for lost or damaged freight. Each unit has A Tip-N-Tell indicator
on the outside of the crate, which 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.
2.2 UNPACKING
Carefully unpack the unit taking care not to damage the unit enclosure when cutting away
packaging materials
After unpacking, make a close inspection of the unit to ensure that there is no evidence of
damage not indicated by the Tip-N-Tell indicator. The freight carrier should be notified
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:
•ASME Temperature and Pressure Safety Relief Valve (P/N 92065-5)
•An 8” Side Air Inlet Adapter (P/N 39184C)
•Condensate Drain Trap (P/N 24441C)
•A 2” Natural Gas Supply Valve (P/N 123540C)
When optional accessories are ordered, they may be packed in 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.
2.3 SITE PREPARATION
Ensure that the site selected for installation of the CENTURION Water Heater includes:
•A level concrete “housekeeping” pad, per the requirements in Section 2.3.3;
•Access to a natural gas supply as specified in Section 2.8;
•Access to AC input power specified in Section 2.9.

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2.3.1 Installation Clearances
All CENTURION models are the same height but vary in depth by model. The unit must be
installed with the prescribed clearances for service as shown in Figure 2-1. The minimum
clearance dimensions, required by PVI, are listed below for all models. However, if Local
Building Codes require additional clearances, these codes shall supersede PVI’s requirements.
The minimum acceptable clearances required are as follows:
Front: 24 inches (61 cm)
Sides: 24 inches (61 cm)
Rear: 24 inches (61 cm)
Top: 18 inches (45.7 cm)
All gas piping, water piping and electrical conduit or cable must be arranged so that they do not
interfere with the removal of any panels or inhibit service or maintenance of the unit.
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.
NOTE: CENTURION units may be installed with zero side clearances in pairs only. Perimeter
clearances still apply. See drawings in Appendix A: Dimensions and Clearance Drawings.

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Figure 2-1: Clearances
W A R N I N G !
Keep unit area clear and free from all combustible materials and flammable vapors or liquids.
FOR MASSACHUSETTS ONLY:
For Massachusetts installations, the unit must be installed by a plumber or gas-fitter licensed
within the Commonwealth of Massachusetts. In addition, the installation must comply with all
requirements specified in Section 1.4, above.

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2.3.2 Setting The Unit
If anchoring the unit, refer to Figure 1-2 for anchor locations.
•All holes are flush with the bottom surface of the frame.
•All dimensions shown are in inches [millimeters]
Figure 2-2: Anchor Bolt Locations
2.3.3 Housekeeping Pad Requirements
To ensure proper condensate drainage, the unit must be installed on a level concrete
“housekeeping” pad. The unit must be positioned on the pad such that the condensate
assembly is not located over the pad, as shown below.
The minimum thickness of the concrete pad depends on two factors:
•Which CENTURION model you’re installing
•Whether the unit will connect to a Condensate Neutralizer tank.
The minimum pad thickness for installations without a Condensate Neutralizer tank is 4 to 8
inches (10.2 to 20.3 cm)
If you are using the Condensate Neutralizer Tank (P/N 89030C), you must ensure enough
height for the condensate to drain into the condensate trap, then into the neutralizer tank, and
then to the drain. This may require that a pit be dug for the Neutralizer Tank. For more
information on the Condensate Neutralizer Tank, see Technical Instruction Document TID-0074.
The following table specifies the minimum pit depth for the Condensate Neutralizer Tank (P/N
89030C) if the unit is installed on a 4" pad, and the pad height if the Neutralizer Tank must be
installed on the floor; note, in all cases a 6” pad eliminates the need to a pit.
TABLE 2.4.3: Pad Height Requirement with Neutralizer Tank
Model
Minimum Pit Depth
Pad Height Without Pit
CEN2000
1-1/4”
5-1/4"

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.
Figure 2-3: Condensate Neutralizer Tank Installation
2.4 LIFTING PROVISIONS
W A R N I N G !
DO NOT attempt to lift or move Water Heater using the gas train or blower.
Three lifting lugs are attached to the top of the heat exchanger, as shown below. Remove the
front and rear top panels from the unit to access the lifting lugs. Remove the four (4) lag screws
securing the unit to the shipping skid. Lift the unit off the shipping skid and position it on the
(required) concrete “housekeeping”pad.
Trap
Support
Housekeeping
Pad
Condensate
Neutralizer
Figure 2-4: Water Heater Lifting Lug Locations
Water Heater

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2.5 PIPING CONNECTIONS
When connecting the hot water outlet and return-water inlets to building piping, first make sure
the mating surfaces are thoroughly clean.
CENTURION Water Heaters have the following inlets and outlets:
•3” (7.6 cm) flange water INLET and hot water OUTLET piping.
•One of the following gas inlet pipes:
o2” (5.08 cm) NPT Natural Gas inlet pipe.
•8” (20.3 cm) Air Inlet adapter.
CONDENSATE DRAIN
NATURAL GAS INLET
HOT WATER OUTLET
BUILDING RECIRCULATION WATER INLET
(WARMER WATER )
AIR INLET (1 of 2)
COLD WATER INLET
(COOLER WATER)
EXHAUST MANIFOLD
RECIRCULATION LOOP ASSEMBLY
Figure 2-5: Inlet and Outlet Locations

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2.5.1 Internal Recirculation Water Loop
The internal Recirculation Water Loop assembly is located at the rear of the unit (Figure 2-6).
This assembly contains a recirculation pump that connects the upper hot water outlet to the
lower (cold) water inlet to heat exchanger. This loop provides feed-forward (FFWD) temperature
control by mixing a portion of the hot water outlet with the cold-water inlet to the unit.
Temperature sensors located in the hot water outlet and the lower cold-water inlet provide
temperature data to the Edge Controller. The Controller 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. A check valve integrated into the pump prevents the water flow
from the cold water inlet side to the hot water outlet side through the recirculation loop.
RECIRCULATION
LOOP PIPING
HOT WATER OUTLET
3” FLANGE
T&P RELIEF VALVE
LOCATION
RECIRCULATION PUMP
COLD WATER INLET
(COLDER) 3” FLANGE
LOWER DRAIN VALVE
HEAT EXCHANGER
TEMPERATURE SENSORS
NOTE: The Temperature
Sensors are direct
immersion type sensors.
Before removing, relieve
pressure and remove
water below sensor level.
BUILDING RECIRCULATION
WATER INLET
(WARMER) 3” FLANGE
Figure 2-6: Recirculation Loop Rear View

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2.5.2 Test Hose Connection
A test hose must be connected from the drain valve on the hot water outlet to the floor drain.
This is required for startup and testing. The test hose diameter should be a minimum of 3/4"
(1.9 cm).
2.5.3 Dual Inlet Return Piping
The standard dual-inlet connections allow CENTURION Water Heaters to be configured with a
separate cooler return temperature zone, rather than blending high and low return temperature
zones. Utilizing the dual return capability, these Water Heaters can take further advantage of
the unit’s condensing capabilities. When configured in this way, thermal efficiency can improve
by up to 6% (based on an 80 °F (26.7 °C) minimum return water temperature at full fire).
To use the recirculation inlet, pipe the warmer building return water to the building recirculation
(upper) inlet and the cold domestic inlet water to the lower inlet. If the flow through both the
primary and the building recirculation inlet is constant, then the combined minimum flows must
equal the specified minimum flow of the Water Heater. If the flow through either of the inlets is
intermittent, then the minimum flow through one of the return connections must always equal
the specified minimum flow of the Water Heater.
Contact your PVI representative for additional information.
DRAIN VALVE
(Connect Test
Hose Here)
HOT
WATER
OUTLET
Figure 2-7: Test Hose Location

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Figure 2-8: Dual Inlets
2.5.4 Sequencing Isolation Valve
If the CENTURION Water Heater was ordered for use with the Water Heater Management
(WHM) system, the unit will arrive with the actuator-controlled Sequencing Isolation Valve,
packed separately within the shipping container.
If installation is required, see Section 2.14: Sequencing Isolation Valve Installation. See Section
5.2.4: Recommendations for WHM Operation and SECTION 8:for more information on
implementing WHM.
NOTE: Sequencing Isolation Valves are required in a multi-unit configuration.
2.6 TEMPERATURE AND PRESSURE RELIEF VALVE INSTALLATION
An ASME rated Temperature and Pressure Relief Valve is supplied with each CENTURION
Water Heater. The valve setpoint is 150 psig (1034 kPa) at 210°F (98.9°C). The relief valve is
installed on the hot water outlet of the Water Heater, as shown below. A suitable pipe joint
compound should be used on the threaded connections. Any excess should be wiped off to
avoid getting any joint compound into the valve body. No valve is allowed between the relief
valve and the heat exchanger.
The relief valve must be piped to within 12 inches (30.5 cm) of the floor to prevent injury in the
event of a discharge. No valves, restrictions, or other blockages are allowed in the full port
discharge line.
In multiple unit installations the discharge lines must NOT be manifolded together. Each must
be individually run to a suitable discharge location.
BUILDING RECIRCULATION
INLET (WARMER WATER)
COLD WATER INLET
(COOLER WATER)