PVI Industries CONQUEST 20 L 100 A-GCL Instruction Manual

PV500-70 10/15
INSTALLATION & MAINTENANCE MANUAL
CONQUEST® WATER HEATER with
EOS (ELECTRONIC OPERATING SYSTEM)
MODELS (20, 25, 30) L 100 A-GCL
Installation and service must be performed by a qualified service installer, service agency or the gas supplier.
IMPORTANT: THIS MANUAL CONTAINS INFORMATION REQUIRED FOR INSTALLATION, OPERATION AND
MAINTENANCE OF THIS EQUIPMENT. READ AND FOLLOW THE INFORMATION IN THIS MANUAL AND ALL OTHER
PROVIDED INSTRUCTIONS, LABELS AND MARKINGS BEFORE INSTALLING, OPERATING OR SERVICING THIS UNIT.
TO THE INSTALLER: After installation, these instructions must be given to the equipment user or left near the appliance.
SPECIAL INSTRUCTIONS TO THE OWNER: Retain this manual for future reference. These instructions contain
important information that will help you in maintaining and operating this appliance.
PVI INDUSTRIES, LLC - Fort Worth, Texas 76111 - Web www.pvi.com - Phone [phone]

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TABLE OF CONTENTS
1. Safety Considerations
2. Product Description
3. Water Heater Installation
3.1 Checking Equipment Before You Install
3.2 Codes
3.3 Electrical Requirements
3.4 Handling and Locating the Water Heater
3.5 Clearances to Combustible Surfaces
3.6 Service Clearances
3.7 Other Codes and Regulatory Clearances and Requirements
4. General Piping Guidelines
4.1 Inlet and Outlet Connections
4.2 Building Return Piping
4.3 Requirement for 180°F Delivered Water to a Dish Machine
4.4 Booster Heater Applications
5. Condensate Drain, Trap & Disposal
5.1 Condensate Neutralization System (optional)
6. Gas Supply and Piping
6.1 Gas Train and Controls Certification
6.2 Gas Control Trains
6.3 Inlet Pressure
6.4 Manifold Pressure
6.5 Gas Piping Size
6.6 Appliance Isolation During Gas Supply Piping Pressure Test
6.7 Gas Connection
7. Combustion and Ventilation Air
7.1 Equipment Located in Confined Spaces
7.2 Maximum Allowed Remote Combustion Air Inlet Length
7.3 Remote Combustion Air Cap
7.4 Vertical or Horizontal Remote Air Duct Termination
7.5 Combining Remote Air Ducting
8. Venting
8.1 Venting the CONQUEST
8.2 Maximum Vent Length
8.3 Vertical or Horizontal Vent Termination
8.4 Combining Category IV Vent
8.5 Concentric Vent for Combustion Air and Exhausting Flue Products
8.6 Connecting to an Existing Vent System
9. Operating and Safety Controls
9.1 Temperature and Pressure Relief Valve(s)
9.2 Cathodic Protection
9.3 Electronic Low Water Cut-off
9.4 Operating Temperature Control
9.5 High Water Temperature Limit
10. EOS (Electronic Operating System)
10.1 Touch Screen User Interface

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10.2 Status Field Display
10.3 Operational Sequence Field Display
10.4 View Menu (Home Screen - Default Display)
10.5 Control System Menus
10.6 Changing the Operating Set Point
10.7 Setting the Real Time Clock
10.8 Scheduled Setback
10.9 Using the Manual Override Menu
10.10 Potentiometer (Operating Set Point for Standalone Operation)
10.11 Using Tool Box Menu
11. Communications and Diagnostics
11.1 Indicators
11.2 Alarm Messages – Diagnostic Codes (Flashes)
11.3 Replacing the Fuse
11.4 Self-Check/Control Failure
11.5 System Safety Checks
11.6 Flame Current Measurements
11.7 Non-Volatile Lockout/Manual Reset
11.8 ID Card
12. Network Menu
12.1 EOS Register List
12.2 Error Codes
13. Remote Connections – Terminal Strip
13.1 Making BMS/BAS Remote Connection for Analog and Binary Signals
13.2 Terminal Functions
14. Sequence of Operation
15. Initial Startup
15.1 Initial Startup Requirements
15.2 Tools and Instrumentation Required
15.3 Resources
15.4 On Site Considerations
15.5 Startup Procedure
16. NSF Food Service Installation Guidelines
17. Troubleshooting Procedure
17.1 General Troubleshooting
17.2 LED Error Code Listing
18. Replacement Parts
18.1 Burner Assemblies
18.2 Control Panel Components
18.3 Gas Train Assembly
18.4 Drain Valve –T&P Relief Valve – Integral Circulating Pump Assembly
18.5 Condensate Drain Trap and Optional Condensate Neutralizer
18.6 Component Wiring and Conduit Routing Details
19. Periodic Maintenance
20. Recommended Maintenance Schedule
21. Requirements for the Commonwealth of Massachusetts

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1 SAFETY CONSIDERATIONS
WARNING: If the information in the supplied manual(s) is not followed exactly, a fire, explosion or exposure to
hazardous materials may result, causing property damage, personal injury or death.
AVERTISSEMENT. Assurez-vous de bien suivre les instructions données dans cette notice pour réduire au
minimum le risque d’incendie ou d’explosion ou pour éviter tout dommage matérial, toute blessure ou la mort
FOR YOUR SAFETY
•Do not store or use gasoline or other flammable vapors or liquids in the vicinity of this or any other appliance.
•Ne pas entreposer ni utiliser d’essence ou ni d’autres vapeurs ou liquides inflammables à proximité de cet appareil ou de
tout autre appareil.
WHAT TO DO IF YOU SMELL GAS
•Do not try to light any appliance.
•Do not touch any electric switch; do not use any phone in your building.
•Immediately call your gas supplier from a location away from your building and the smell of gas. Follow the gas
supplier's instructions.
•If you cannot reach your gas supplier, call the fire department.
QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ:
•Ne pas tenter d’allumer d’appareil.
•Ne touches à aucun interrupteur; ne pas vous server des téléphones se trouvant dans le bâtiment.
•Appelez immediatement votre fournisseur de gaz depuis un voisin. Suivez les instructions de fournisseur.
•Si vous ne pouvez rejoinder le fournisseur, appelez le service de incendies.
Installation and service must be performed by a qualified installer, service agency or the gas supplier.
L’installation et l’entretrien doivent être assurés ou un service d’entretien qualifié ou par le fournisseur de gaz.
This product contains, or may come to contain materials that have been identified as carcinogenic, or possibly carcinogenic
to humans. Before installing, servicing or removing this product, read and follow the supplied instructions
Clearance in accordance with the local installation codes and the requirements of the gas supplier.
Dégagement conforme aux codes d’installation locaux et aux exigencies du foumisseunde gaz.
Should overheating occur or the gas supply fail to shut off, turn off the manual gas control valve to the appliance.
En cas de surchauffe ou si l’alimentation en gas ne s’arrête pas, fermez manuellement le robinet d’arrêt de l’admission de
gaz.
WARNING: Installation and service must be performed by a qualified installer, service agency or the gas supplier,
who must read and follow the supplied instructions before installing, servicing or removing this appliance. Refer to
the information contained in this manual. Improper installation, adjustment, alteration, service or maintenance can
cause property damage, personal injury, exposure to hazardous materials or death.
WARNING: Do not use this appliance if any part has been under water. Immediately call a qualified service
technician to inspect the unit and to replace any part of the control system, all gas controls and all other items
affecting safe appliance operation and which has been under water.
AVERTISSEMENT: N’utilisez pas cet appareil s’il a été plongé dans l’eau, même partiellement. Faites inspecter
l’appareil par un technicien qualifé et remplacez toute partie du système de contrôle et toute commande qui ont été
plongés dans l’eau.
WARNING: In an emergency shut the main gas supply valve to the appliance from a location safely away from the
emergency. Failure to follow these instructions can cause property damage, personal injury, and exposure to
hazardous materials or death.

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PRODUCT SAFETY INFORMATION
REFRACTORY CERAMIC FIBER PRODUCT WITH CRYSTALLINE SILICA
WARNING: This product contains or may come to contain crystalline silica, which has been identified by the
International Agency for Research on Cancer (IARC) as carcinogenic to humans. This product also contains
refractory ceramic fibers, which have been identified by the IARC as possibly carcinogenic to humans. Avoid
breathing fiber particulates and dust.
RISKS:
•Air borne fibrous insulation is a possible cancer hazard by inhalation.
•Airborne crystalline silica may cause silicosis (lung disease) by inhalation.
•May cause temporary irritation to eyes, skin, and respiratory tract.
PRECAUTIONARY MEASURES:
•Minimize airborne fibers with engineering controls.
•Use NIOSH/MSHA approved respirators as required (see MSDS).
•Wear long sleeved, loose-fitting clothing, eye protection and gloves.
FIRST AID MEASURES: (If any of the irritations listed persists, seek medical attention)
•Eyes: Flush with water.
•Skin: Wash with soap and warm water.
•Ingestion: Do not induce vomiting. Get medical attention if gastrointestinal symptoms develop.
•Inhalation: Remove to fresh clean air.
WARNING: If you are unfamiliar with the safe handling of refractory ceramic fiber products, or if you wish additional
information prior to beginning any disassembly of the water heater or boiler that might expose refractory ceramic
fiber materials, contact: Unifrax Corporation, 2351 Whirlpool Street, Niagara Falls, NY 14305-2413, 1-800-322-2293.
IDENTIFICATION OF REFRACTORY CERAMIC FIBER MATERIALS (RCF):
The burner assembly utilizes RCF material. (The RFC materials are located within the product and not generally exposed
except during service, disassembly or assembly.)

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IMPORTANT SAFETY NOTE
It takes only 5 seconds of skin contact with 140°F water to cause a
second degree burn! You must protect against high water temperatures at all
lavatories, tubs, showers and other points of hot water contact.
Accidental scalding from high water temperatures is a greater
risk in some types of installations. Some examples are:
HOMES FOR THE MENTALLY HANDICAPPED
HOMES FOR THE PHYSICALLY HANDICAPPED
HOSPITALS AND NURSING HOMES
ELDER CARE FACILITIES AND REST HOMES
ORPHANAGES AND CHILD CARE FACILITIES
OTHER INSTALLATIONS - WHERE RESPONSE TO CONTACT WITH HOT
WATER MAY BE SLOWER OR WHERE THE DANGER OF
HOT WATER CONTACT IS GREATER.
Thermostatically controlled mixing valves must be used in the
design of the potable hot water system.
Potable hot water should be tempered to no more than
110°F when used for bathing or other personal uses.
Good engineering practice mandates the use of thermostatically controlled
mixing valves set at 120°F or less to keep the delivered water temperature below
scalding temperatures.

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2 PRODUCT DESCRIPTION Component, Controls and Connection Locations
(Locations May Vary)

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3 WATER HEATER INSTALLATION
3.1 Checking Equipment Before You Install
•Inspect the unit completely upon receipt from the freight carrier before signing the bill of lading. Inspect the
appliance and all accompanying parts for signs of impact or mishandling. Verify the total number of pieces shown
on packing slips with those actually received. Contact the freight carrier immediately if any damage or shortage is
detected.
•Check the data decal on the appliance. Be sure the electrical, water and gas supply is adequate for the
installation.
•Carefully remove all side and top shipping supports and bracing. If possible, do not remove the wooden base/skid
assembly until the product has been moved to its final location for installation and operation (see: Handling and
Locating the Water Heater).
3.2 Codes
The equipment must be installed in accordance with those installation regulations in force in the local area where the
installation is to be made. Authorities having jurisdiction must be consulted before installation is made. In the
absence of such requirements, the installation must be in accordance with the instructions in this manual, appliance
markings and supplemental instructions and in compliance with the latest edition of the National Fuel Gas Code,
ANSI Z223.1/NFPA 54. Where required by the Canadian authority having jurisdiction, the equipment must be
installed in accordance with the latest edition of the CAN/CSA B149.1-10 Natural Gas and Propane Installation Code
and applicable Provincial Regulations. All appliances conform to the current edition of the ASME Boiler and Pressure
Vessel Code, Section IV, Part HLW.
3.3 Electrical Requirements
See appliance rating decal for electrical service requirements. The appliance must be electrically supplied and
grounded in accordance with the requirements of the authority having jurisdiction or, in the absence of such
requirements, with the latest edition of the National Electrical Code ANSI/NFPA No. 70. In Canada, the electrical
service must conform to local electrical codes and/or CSA C22.1, Canadian Electrical Code, Part 1.
•All wiring between the unit and field installed devices must be made with type T copper wire.
•Line voltage wire exterior to the appliance must be enclosed in approved conduit or approved metal clad cable.
•To avoid serious damage, DO NOT energize the unit until the system and appliance is full of water.
Utiliser du fil de cuivre de la taille appropriée pour le service électrique entrant. Les dommages résultant de
l'utilisation de fil d'aluminium seront exclus du champ d'application de la garantie de cet appareil.
3.4 Handling and Locating the Water Heater
WARNING: Use industry standard safe rigging methods, such as strapping around the water heater
base/skid assembly and using spreader bars, when attempting to lift or move this product. Failure to follow
industry standard safe rigging methods can result in property damage, serious injury or death.
1 The water heater must be located indoors.
2 This water heater can be installed directly on a combustible floor.
3 Locate the water heater in an area that is not exposed to freezing temperatures.
4. Locate on a level surface. Installation on a 4 inch to 6 inch housekeeping pad is recommended.
5. Locate the water heater near a floor drain. Locate the unit so if the tank or water connections should leak, water
damage will not occur to the adjacent area or to lower floors of the building. When such locations are
unavoidable, install an adequately drained metal drain pan underneath the water heater. The manufacturer’s
warranty does not cover water damage.
6. Protect associated electrical components and electrical connections from water (dripping, spraying, rain, etc.)
during appliance operation and service.
7. Locate the water heater where the vent and air intake piping, when installed, will remain within the maximum
equivalent lengths allowed. See Venting.
8.Use the following diagram to locate anchors or attachment points, when connecting the heater to the floor.
Commonly used concrete anchors: 5/16" x 1-3/4" double expansion shield

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3.5 Clearances To Combustible Surfaces
The minimum clearance to combustible material is 15" from the top, 24" from the front and zero clearance (0") from
the sides and back of the water heater. The Conquest can be installed directly on a combustible floor.
Distance minimale aux matériaux combustibles est égale à zéro (0 cm) sur les côtés et à l'arrière, avant les 61 cm,
38 cm de haut et peut être installé directily sur un plancher combustible.
3.6 Service Clearances
Additional clearance beyond the minimum required to combustible material should be considered to facilitate easy
access for inspection and service of items such as the burner, gas controls and plumbing connections. Also allow
sufficient space for installing and servicing building water, gas, vent, combustion air, electrical, pump and other
auxiliary/optional equipment and connections.
3.7 Other Code and Regulatory Clearances and Requirements
Additional clearance beyond the minimum required to combustible materials and other requirements may be required
to comply with local, state or national codes and regulations. It is to the responsibility of the installer to comply with
these requirements. Examples of codes or regulations that may apply are the National Electric Code,
State/Regional/National drain water and flue emissions regulations, the National Fuel Gas Code, Building
Construction and Safety Codes, the Americans with Disabilities Act (ADA) and, in states where a water heater above
a certain input or storage capacity is considered a boiler, the applicable boiler code requirements, the applicable
boiler installation requirements in “Safety Code for Controls and Safety Devices for Automatically Fired Boilers”
(CSD-1) and other regulatory requirements.

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4 GENERAL PIPING GUIDELINES
4.1 Inlet and Outlet Connections
1. Use only non-ferrous water piping and fittings. Do not use galvanized pipe or fittings. Use of ferrous or galvanized
pipe or fittings can cause rust to form.
2. Install shut-off valves and unions on the inlet and outlet water piping for servicing. Use caution when threading
pipe nipples into tank connections to prevent cross threading, or over-tightening. Always use a back-up wrench on
tank nipples when tightening unions, valves, etc.
3. Insulate hot water and return circulation lines. Insulate cold water supply lines if subject to freezing during
shutdown periods. IMPORTANT: Do not use the plumbing connected to the appliance as a ground for welding or
any other purpose.
4. Pipe the drain valve to a suitable open drain capable of receiving discharge temperatures up to 212ºF.
IMPORTANT: For maximum efficiency, the inlet water to the Conquest should not exceed 100ºF. It is also
recommended that the building return or dishwasher recirculation piping be connected to the return water connection
located at the mid-tank and not to the cold inlet water supply. The Conquest utilizes cold inlet water to help extract
almost all of the heat energy from the products of combustion, which lowers the vent temperature to allow the use of
PVC vent pipe. Higher cold inlet water temperatures will reduce heater efficiency and increase the vent temperature.
If the vent temperature approaches the maximum allowed, a vent temperature limit switch will cycle the heater off to
protect the PVC vent. When high temperature inlet water is applied, such as the Booster Heater Application
described later in section 4, follow the instructions for required venting selection and vent limit adjustment.
4.2 Building Return Piping
To maximize water heater efficiency, do not connect the building return or dishwasher recirculation piping (≈5 gpm)
directly to the cold inlet. Connect directly to the dedicated building return fitting located at the rear of the tank at mid-
tank level.
SINGLE WATER PIPING

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SINGLE STORAGE WATER HEATER WITH SUPPLEMENTAL STORAGE TANK
TWO WATER HEATERS WITH REVERSE RETURN PIPING

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4.3 Requirement for 180°F Delivered Water to a Dish Machine
When the Conquest water heater is applied as the high temperature water source for a dish washing application, the
application requirements and notes below must be followed.
Application Requirements and Notes:
For Conquest applied as the high temperature water source for a dish washing application, follow all instructions in
the “VENTING” and “GENERAL PIPING GUIDELINES” Sections of this manual, EXCEPT that:
1. These instructions are for operation with normal cold inlet water temperatures of less than or equal 110°F.
Contact factory for inlet water temperatures above 110°F.
2. Solid PVC exhaust venting is acceptable for inlet water temperatures less than or equal 100°F. If inlet water
temperatures are above 100°F, then solid CPVC or ETL, UL, ULC or CSA listed polypropylene or stainless steel
venting is required and the vent limit switch must be adjusted for the higher temperature rating allowed by these
vent materials (Contact factory for instructions).
3. Change the following EOS control settings on the Conquest water heater applied as the high temperature water
source for a dish washing application:
1. Adjust the operating differential (DIFF) to 2°F; 2. Adjust the operating offset (OFFSET) to 3°F; and 3. If the
installed exhaust venting material is solid CPVC or ETL, UL, ULC or CSA listed polypropylene or stainless
steel, adjust the vent limit switch (Contact factory for instructions). Adjust these parameters in the Setup menu
of the digital control display. These settings are used on most dish washing applications, but may require
adjustment for optimal performance.
4. The dish washer application must include a 15 gpm circulation loop between the booster heater and the dish
machine. A B&G NBF 22 pump with a minimum 1-inch pipe return to the heater is recommended and is available
from PVI.
5. All dishwashing machines meeting National Sanitation Foundation (NSF) requirements must operate between 15
and 25 PSI water flow pressure. Pressure reducing or flow regulating control valves in the hot water supply line to
the dishwasher should be adjusted within these limits.

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4.4 Booster Heater Applications
When the Conquest water heater is applied as the high temperature water heater in a booster heater application, the
application requirements and notes below must be followed.
Application Requirements and Notes
For Conquest applied in a booster heater application, follow all instructions in the “VENTING”, “GENERAL PIPING
GUIDELINES” and “CONDENSATE DRAIN, TRAP & DISPOSAL” Sections of this manual, EXCEPT that:
1. A minimum water temperature of 140°F must be supplied by the general purpose water heater to the inlet of a
Conquest water heater, when it is applied as a booster heater. Contact the factory, if the general purpose water
heater cannot supply water temperatures with a minimum of 140°F.
2. Solid CPVC or ETL, UL, ULC or CSA listed polypropylene or Stainless Steel venting system is required for the
booster heater. If a concentric vent is used, the vent must be solid CPVC and terminated with an IPEX CPVC
System 636 concentric vent termination kit. The General Purpose Water Heater has no special installation
requirements when it is used to supply 140°F water to the inlet of the booster heater.
3. When the Conquest is applied as a booster heater, the vent limiting switch must be adjusted for the higher
temperature rating allowed by the use of the solid CPVC, polypropylene or stainless steel venting (Contact factory
for instructions).
4. Change the following EOS control settings on the Conquest water heater applied as a booster heater using the
required CPVC or ETL, UL, ULC or CSA listed polypropylene or stainless steel venting system:
1. Adjust the operating differential (DIFF) to 2°F; 2. Adjust the operating offset (OFFSET) to 3°F; and 3.
Adjust the vent temperature limit switch (Contact factory for instructions). Adjust these parameters in the
Setup menu of the control display. These settings are used on most booster heater application, but may
require adjustment for optimal performance.
5. Install a 3/4" CPVC threaded pipe plug into the condensate outlet fitting near the vent connection. Do not use the
supplied “P” trap. Since booster heater operation with an inlet water temperature of 140°F or higher does not
result in the formation of condensate, there is no liquid available to form the water seal in a “P” trap. Without the
water seal, some flue gas can escape into the installed space.
6. The booster heater application must include a 10 gpm circulation loop between the booster heater and the dish
machine. A B&G NBF 22 pump with a minimum 1-inch pipe return to the heater is recommended and is available
from PVI.
7. All dishwashing machines meeting National Sanitation Foundation (NSF) requirements must operate between 15
and 25 PSI water flow pressure. Pressure reducing or flow regulating control valves in the hot water supply line to
the dishwasher should be adjusted within these limits.

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5 CONDENSATE DRAIN, TRAP & DISPOSAL
All Conquest water heaters, except those applied as a booster water heater (see Section 4.3 for booster
instructions), are for operation with normal cold inlet water temperatures of less than or equal 110°F and produce a
significant amount of condensate. The condensate drain is under slightly positive flue pressure, so the provided 3/4"
PVC condensate trap must always be used. This trap is sized and designed to fill with the proper amount of
condensate to create a liquid barrier to prevent flue gases escaping through the condensate drain into the installed
space.
WARNING: The trap included with this unit must be installed and maintained as described in these
instructions and must be included as part of the condensate piping system. This trap is required to keep
potentially hazardous products of combustion from continually entering the installed space where the
condensate piping terminates. Failure to properly install this trap can cause, personal injury, exposure to
hazardous materials or death.
1. Attach the 3/4" PVC fitting from the union on the condensate trap assembly to the PVC pipe exiting the flue
collector located near the front of the Conquest. Additional PVC fittings and pipe can be added to the flue
collector connection to relocate the condensate trap assembly as long as all added parts are at the same
elevation. After attachment, the trap must be rotated so the offset in the pipe aims down toward the floor. Do not
rotate the offset toward the ceiling. Do not use tools to tighten the PVC union. Hand-tighten the PVC union to
seat the internal gasket.
2. Do not combine condensate drains from multiple condensing appliances into a single drain line. Route each
drain line into a drain suitable for condensate and make certain the end of the drain lines are not submerged or
otherwise blocked.
3. All condensate plumbing must be protected from freezing. Do not locate the condensate piping such that an ice
dam of frozen condensate can block condensate from leaving the outlet.
4. The condensate is only slightly acidic (3-5 PH), however, local codes may require it to be neutralized prior to
entering the drainage system. An optional, field installed, Condensate Neutralization System is available from
the factory.
5. Connect a condensate drain line or the PVI Condensate Neutralization System to the barbed hose connection,
sized for 1/2" ID heavy wall Vinyl tubing rated for 170ºF or higher, located at the end of the condensate trap. All
piping from the condensate trap to the suitable drain must remain below the highest point (top of the
condensate outlet pipe) on the properly attached condensate trap.
Condensate Trap without Optional Condensate Neutralizer

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5.1 Condensate Neutralization System (optional)
Condensate is only slightly acidic (3-5 PH), however this slight acidity can be neutralized by routing it through an
optional PVI Condensate Neutralization System. Some “authorities having jurisdiction” require such neutralization
before condensate disposal through a suitable drain. Condensate is neutralized while slowly flowing through a
container filled with renewable crushed limestone. The condensate neutralizer reduces or avoids the need for
separate chemical treatment or dilution using substantial quantities of tap water. Contact your local PVI
representative to obtain a Condensate Neutralization System and follow the instructions included for assembly and
connection.
Condensate Neutralization Systems (CNS) Installation Requirements:
1. Follow the steps 1 through 6 in the Condensate Drain, Trap & Disposal section above.
2. The Condensate Neutralization System (CNS) must be mounted horizontally and level, with the mounting strap
legs on the floor.
3. Locate the CNS in a convenient place between the condensate outlet and a suitable drain and where the 3"
threaded end cap can be removed to recharge the Neutralizer with crushed limestone.
a. The CNS must be located such that condensate will flow downhill from the condensate trap outlet to the
inlet on one end of the CNS and downhill from the other end of the CHS to the drain. If this continuous
downhill flow is not maintained, the trap will not properly operate and condensate could back up into the
heater.
b. Follow the instructions included in the Condensate Neutralization System for connecting the supplied 1/2"
Vinyl tubing.
4. Keep the Condensate Neutralization System closed at all times, except for when the appliance is turned off for
maintenance to recharge the condensate neutralizer with limestone.
WARNING: Keep the Condensate Neutralization System closed at all times the appliance is operating. The
system must remain closed to prevent potentially hazardous products combustion from continually enter
the room. Failure to keep the Condensate Neutralization System closed during appliance operation can
cause property damage, exposure to hazardous material, personal injury or death.
Condensate Trap with Optional Condensate Neutralizer Located On Same Level as Conquest

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Condensate Trap with Optional Condensate Neutralizer Located Below Conquest
6 GAS SUPPLY AND PIPING
Verify the type of gas specified on rating plate is supplied to the unit. This unit is orificed for operation up to 2000 feet
altitude. Appliance Btu/h input derates 4% per 1000 feet elevation above sea level. Consult Factory for installations
above 2000 feet elevation.
6.1 Gas Train and Controls Certification
NOTE: The gas train and controls assembly provided on this unit have been tested under the applicable Nationally
Recognized Standard to comply with safety and performance criteria such as ignition, combustion and safety
shutdown operation.
6.2 Gas Control Trains
All models include the following gas control train components: manual shutoff valve, two safety shutoff valves, zero
governor type regulator, manual test valve and manifold pressure taps. These components may be separate or
combined in a common housing.
WARNING: Do not adjust or remove any screws or bolts on gas train control components which are secured
with a red or blue sealing compound. In addition to voiding warranties and certification listings, such
adjustment or disassembly can cause improper operation which could result in property damage, personal
injury or death.
6.3 Inlet Pressure
Measure at the inlet pressure tap located at the main gas cock. The inlet pressure must remain within the minimum
and maximum values while the unit is at rest and while the unit is operating at maximum firing rate.
6.4 Manifold Pressure
Measure at the pressure tap located downstream side of the manual valve closest to the burner. The rated manifold
pressure appears on the product data label located near the front of the appliance.
INLET PRESSURE NAT. GAS Propane
Maximum Static Pressure (Inches-Water Column) 14.0" 13.0"
Minimum Flow Pressure (Inches-Water Column) 3.5" 8.0"

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6.5 Gas Piping Size
Do not use the gas pipe connection size to determine the gas supply piping. Designing and sizing a gas supply
piping system requires consideration of many factors and must be done by a gas supply piping expert. Always follow
NFPA 54 National Fuel Gas Code for gas pipe sizing and gas pipe system design. The following charts provide
examples of some of the information used by the gas supply piping expert to determine proper pipe sizes.
Use the values in the following table to add the equivalent straight pipe for each elbow or tee to obtain the total
distance from the meter:
Use the following table to determine the possible pipe size based on distance from gas meter for a Single Unit
Installation using Schedule Metallic Gas Pipe.*
SINGLE UNIT INSTALLATION – POSSIBLE SCHEDULE 40 METALLIC GAS PIPE SIZE*
Distance from meter in equivalent feet of schedule 40 metallic gas pipe.* Based on inlet pressure less
than 2 psi, specific gravity of 0.60 and a pressure drop of 0.5 in. W.C.
MODEL 0' - 50' 51' - 100' 101' - 200' 201' - 300' 301' - 500'
20 1" 1" 1-1/4" 1-1/2" 2"
25 1" 1-1/4" 1-1/4" 1-1/2" 2"
30 1" 1-1/4" 1-1/4" 1-1/2" 2"
*See NFPA 54 National Fuel Gas Code for actual pipe size selection and for sizing Propane gas piping
*See NFPA 54 National Fuel Gas Code for actual pipe size selection and for sizing Propane gas piping
6.6 Appliance Isolation during Gas Supply Piping Pressure Test
1. The appliance and its provided manual shutoff valve must be disconnected from the gas supply piping system
during any pressure testing of that system at test pressures in excess of ½ PSI (3.5 kPa).
2. The appliance must be isolated from the gas supply piping system by closing its individual manual shutoff valve
during any pressure testing of the gas supply piping system at test pressures equal to or less than ½ PSI (3.5
kPa).
3. The appliance and its gas connection must be leak-tested before placing it in operation.
CONVERT FITTINGS TO EQUIVALENT STRAIGHT PIPE*
Diameter Fitting (inches) ¾" 1" 1¼" 1½" 2" 3" 4" 5"
Equivalent Length of Straight Pipe (feet) 2' 2' 3' 4' 5' 10' 14' 20'
MULTIPLE UNIT INSTALLATIONS SCHEDULE 40 METALLIC GAS PIPE SIZE CHART*
Maximum Capacity of Pipe in Thousands of BTU’s per hour for gas pressures of 14 Inches Water Column (0.5 PSIG) or
less and a pressure drop of 0.05 Inch Water Column (Based on NAT GAS, 1025BTU’s per Cubic Foot of Gas and 0.60
Specific Gravity).*
Nominal Iron
Pipe Size,
Inches
Length of Pipe in Straight Feet
10 20 30 40 50 60 70 80 90 100 125 150 175 200
3/4 369 256 205 174 155 141 128 121 113 106 95 86 79 74
1 697 477 384 328 292 267 246 256 210 200 179 164 49 138
1 1/4 1400 974 789 677 595 543 502 472 441 410 369 333 308 287
1 1/2 2150 1500 1210 1020 923 830 769 707 666 636 564 513 472 441
2 4100 2820 2260 1950 1720 1560 1440 1330 1250 1180 1100 974 871 820
2 1/2 6460 4460 3610 3100 2720 2460 2310 2100 2000 1900 1700 1540 1400 1300
3 11200 7900 6400 5400 4870 4410 4000 3800 3540 3300 3000 2720 2500 2340
4 23500 16100 13100 11100 10000 9000 8300 7690 7380 6870 6150 5640 5130 4720

CONQUEST® WATER HEATER
18
PV500-70 10/15
6.7 Gas Connection
1. Safe operation of unit requires adequate gas supply with the required static and dynamic (flow) pressures. Actual
piping selection depends on many variables that must be carefully considered by the gas piping system designer.
2. Do not select gas pipe sizes based only on the supplied tables. These tables are for use by the gas piping
system designer as a reference in checking pipe size selections.
3. Gas pipe size may be larger than heater connection.
4. Installation of a union is suggested for ease of service.
5. Install a manual main gas shutoff valve on the gas supply piping connected to the appliance to isolate the burner
and gas train from the main supply gas in compliance with NFPA 54 National Fuel Gas Code and most local
Codes.
6. The gas system installer must clearly identify the emergency shut-off device.
7. A sediment trap (drip leg) MUST be provided in the inlet of the gas connection to the unit.
8. The combination gas valve incorporates an internal vent limiter. Venting to outdoors is not allowed.
7 COMBUSTION AND VENTILATION AIR
Provisions for adequate combustion and ventilation air to the mechanical room must be in accordance with Section
“Air for Combustion and Ventilation” in the latest edition of the NFPA 54 National Fuel Gas Code, ANSI Z223.1
and/or CAN/CSA B149, Installation Codes or applicable provisions of the local building codes. Any method
addressed in NFPA 54 National Fuel Gas Code section “Air for Combustion and Ventilation is acceptable and
several are outlined below.
7.1 Equipment Located In Confined Spaces
Equipment located in confined spaces requires two openings, one commencing within 12" (30.5 cm) from the top of
the enclosure/room and one commencing within 12" from bottom of the enclosure/room to assure adequate
combustion air and proper ventilation. The total input of all gas utilization equipment installed in the room must be
used to determine the required minimum air volume needed for combustion, ventilation and dilution of flue gasses.
Also consider makeup air requirements from other equipment within the mechanical room or other rooms that are
pressure connected with the mechanical room. Some examples of other makeup air requirements are from kitchen
exhaust hoods, clothes dryers, powered exhaust fans, etc.
•All Air From Outdoors:
Each opening requires a minimum free area of 1 square inch per 4000 Btu/hr of the total input rating of all
appliances in the enclosure, if directly communicating with the outdoors or communicating to the outdoors
through vertical ducts.
Each opening requires a minimum free area of 1 square inch per 2000 Btu/hr of the total input rating of all
appliances in the enclosure, if communicating with the outdoors through horizontal ducts.
•All Air From Inside The Building:
Follow the requirements of NFPA 54 National Fuel Gas Code, ANSI Z223.1 section “Indoor Combustion Air.”
•Combination Of Air From The Indoors And From The Outdoors:
Follow the requirements of NFPA National Fuel Gas Code, ANSI Z223.1 section “Combination Indoor and
Outdoor Combustion Air.”
•From Outdoors Through One Opening:
Follow the requirements of NFPA National Fuel Gas Code, ANSI Z223.1 section “One Permanent Opening
Method.”
NOTE: This unit may be installed with a remote air intake system which uses a make-up air duct to draw combustion
air directly from outdoors.

CONQUEST® WATER HEATER
19
PV500-70 10/15
WARNING: Adequate clean combustion air must be provided to the appliance. The appliance must never
operate under a negative pressure. Particular care must be taken when exhaust fans, compressors, air
handling units, etc. may rob air from the appliance. The combustion air supply must be completely free of
any chemicals or fumes, which may be corrosive to the appliance. Some common chemical fumes to avoid
are fluorocarbons and other halogenated compounds, most commonly present as refrigerants or solvents,
such as Freon, trichloroethylene, perchlorethylene, chlorine, etc. These chemicals, when in contact with the
equipment or when burned, form acids which quickly attack the tubes, flue collector, stack and other
appliance and auxiliary equipment. Failure to provide adequate clean combustion air or operating under
negative pressure can cause premature, unwarranted product failure or unsafe operation producing carbon
monoxide that could escape into the building. Exposure to carbon monoxide can lead to personal injury or
death.
7.2 Maximum Allowed Remote Combustion Air Inlet Length (Equivalent Length)
A vertical or horizontal remote air inlet system can be connected to this appliance without modification. The
maximum length of field supplied single wall pipe, such as galvanized ventilation pipe, is shown in the chart below
titled Maximum Air Inlet Duct Equivalent Length. Use metal tape or RTV sealant to seal each pipe joint.
Maximum Air Inlet Duct Equivalent Length / Max Elbows
Duct Size 3" Duct 4" Duct 6" Duct
Max Equivalent Length Model 20 100 feet / 4 200 feet / 10 250 feet / 10
Max Equivalent Length Model 25 & 30 100 feet / 4 150 feet / 7 250 feet / 10
To determine the maximum straight length of duct allowed, use the Duct Fitting Equivalent Length chart below to find
the total equivalent length for all duct fittings in your combustion air system. Then subtract this number of feet from
the total equivalent length allowed in Maximum Air Inlet Duct Equivalent Length chart above. The sum of this
calculation is the maximum length of straight duct allowed. If a longer length is required, repeat the calculation using
a larger duct size. No additional deduction is required for the addition of the duct system terminal.
Duct Fitting Equivalent Length for Model 20
Duct Pipe: 3" Duct 4" Duct 6" Duct
90º Elbow 20 feet 10 feet 5 feet
90º Long Radius Elbow 10 feet 7 feet 3 feet
45º Elbow 10 feet 7 feet 3 feet
Duct Fitting Equivalent Length for Model 25 & 30
Duct Pipe: 3" Duct 4" Duct 6" Duct
90º Elbow 20 feet 15 feet 10 feet
90º Long Radius Elbow 12 feet 9 feet 6 feet
45º Elbow 12 feet 9 feet 6 feet
The following remote air duct information is provided for use in design calculations, if needed.
Remote Air Duct Specifications
Input MBtu/h Required Air (SCFM)
199 44
250 54
299 65

CONQUEST® WATER HEATER
20
PV500-70 10/15
7.3 Remote Combustion Air Cap
A suitable remote air termination must be used to prevent water, debris, animals or obstructing material from entering
the remote air supply.
7.4 Vertical or Horizontal Remote Air Duct Termination
•Air inlet must be located no less than 3 feet (0.91m) below the exhaust terminal if they are within 10 feet (3.05 m)
of each other, unless the flue outlet terminates with a straight discharge. If the flue outlet terminates with a
straight discharge, the air inlet can be located no less than 18 inches (0.46m) below the exhaust terminal.
•If terminating through the roof, the air inlet must terminate at least 12 inches (0.3 m) above roof level and at least
12 inches (0.3 m) above snow levels.
•If terminating through a sidewall, the air inlet must terminate at least 12 inches (0.3 m) above grade and/or at
least 12 inches (0.3 m) above possible snow levels.
Vertical Remote Air Horizontal Remote Air
* When flue outlet is terminated with a straight discharge, separation of terminations must be a minimum of 18".
7.5 Combining Remote Air Ducting
Each water heater MUST have separate intake piping, unless the air inlet piping, exhaust duct and other system
considerations have been fully evaluated and a combined duct system designed by one of the duct design firms
identified at www.pvi.com/vent-design.html. Before operation of a combined remote air ducting system, all of the duct
design firm’s system installation and operation requirements must be in place, their instructions followed and the
system must be properly maintained.
Combined Conquest air intake piping must incorporate a variable speed blower capable of providing and regulating
positive pressure air supplied to all water heaters in the system. The pressure of the supplied air must not be less
than 0.0 W.C. and must not exceed 0.25" W.C.
The common combustion air supply system must be interlocked, so the water heaters will not begin operation until
the common combustion air supply is proved to be within the range of 0.0 to 0.25" W.C. See Section on Remote
Connections for a discussion of how to connect the proving circuit.
WARNING: Do not combine remote air ducting of multiple appliances into a single remote air duct unless the
combined remote air ducting system has been evaluated and designed by a specified duct design firm and
the combined remote air duct system is installed, operated and maintained following instructions from that
firm. Combining remote air ducting without following these requirements can result in failure of the water
heater and venting system and/or exposure to carbon monoxide and can result in property damage,
personal injury or death.
Notes: