PVI Industries Water Heater PV500 44U User Manual

INSTALLATION & MAINTENANCE MANUAL  
POWER VTPLUS WATER HEATER  
MODELS (40, 50, 75, 90, 100) LX 125 A-PVIF  
MODELS (50, 75, 90, 100) LX (250, 300) A-PVIF  
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 1-800-433-5654  
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10. Operating and Safety Controls  
10.1 Temperature and Pressure Relief Valve(s)  
10.2 Operating Temperature Control  
10.3 High Water Temperature Limit Control  
10.4 Cathodic Protection  
10.5 Electronic Low Water Cut-off (optional)  
11. TEMPTRAC Electronic Controller Panel  
11.1 Principal of Operation  
11.2 Upper LED Readout  
11.3 Lower LED Readout  
11.4 Control Buttons  
11.5 To View the Setpoint  
11.6 To Change the Setpoint  
11.7 To Change Other Parameters  
11.8 LED Display Alarm Messages  
12. Remote Connections – Terminal Strip  
12.1 Making BMS/BAS Remote Connection for Analog and Binary Signals  
12.3 Terminal Functions  
13. Sequence of Operation  
14. Initial Startup  
14.1 Initial Startup Requirements  
14.2 Tools and Instrumentation Required  
14.3 Resources  
14.4 On Site Considerations  
14.5 Startup Procedure  
15. Troubleshooting Guide  
16. Replacement Parts  
16.1 Control Panel  
16.2 Control Panel Components  
16.3 Burner Assembly  
16.4 Burner Assembly Components  
17. Periodic Maintenance  
18. Recommended Maintenance Schedule  
Warranty forms ship separately with each product.  
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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 loss of life.  
FOR YOUR SAFETY  
Do not store or use gasoline or other flammable vapors or 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 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.  
Installation and service must be performed by a qualified installer, service agency or the gas supplier.  
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  
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 loss of life.  
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.  
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 loss of life.  
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:  
Skin:  
Flush with water.  
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, lower tank and upper and lower flue collector assemblies utilize 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
STANDARD FEATURES AND EQUIPMENT  
2.1 Performance  
98% thermal efficiency at full fire from 40° to 140°F  
Up to 99% thermal efficiency with modulation  
< 20 ppm NOx (399 to 900 MBH)  
Ducts direct combustion air up to 100 equivalent feet through 6-inch diameter material (requires UL  
approved vent cap, see optional equipment list)  
Vents up to 100 equivalent feet through 6-inch diameter material  
2.2 Pressure Vessel  
AquaPLEXtank (unlined duplex alloy)  
Storage tank ASME stamped and National Board registered for 150 psi MAWP  
Nonferrous, removable fittings at all tank connections  
Hand hole cleanout  
Fiberglass insulation  
Steel jacket panels with industrial-grade finish  
Drain valve  
2.3 Heat Exchanger  
Three-pass, fire tube design  
AquaPLEXfire tubes  
Secondary economizer for low temperature flue gas  
2.4 Codes and Standards  
Intertek / ETL listed to US and Canadian safety standards  
Intertek / ETL listed for use with CPVC vent material (SANI models require listed Cat IV SS vent)  
Intertek / ETL certified as low-lead compliant  
FM compliant  
ASHRAE 90.1 compliant  
2.5 Burner, Operating Controls & Safeties  
Pre-mix surface burner with self-adjusting, proportionate gas/air ratio  
UL 795 compliant gas train  
Electronic flame safeguard with pre- and post-purge  
Combustion sequence panel lights including lockout  
Programmable electronic operating control with digital temperature readouts,  
adjustable from 70°F to 180°F  
Immersion temperature limiting device (high limit control)  
ASME-rated temperature and pressure relief valve  
NEMA-1 control enclosure  
Terminals for remote on-off  
Flame failure audible alarm and indicating light with remote contacts  
Seamless VFD modulation with 7-to-1 turndown  
2.6 Warranty and Service Policy (see warranty or service policy for details)  
10-Year tank warranty (PV 627)  
3-Year scale failure warranty (PV 563)  
First-year cost-free service policy (PV 551)  
10-Year chloride-induced stress corrosion cracking warranty (PV 8083)  
2.7 Miscellaneous  
Factory authorized startup  
Vent termination cap, 6-inch diameter (larger cap optional)  
Factory-equipped for connection to direct inlet air (requires UL listed vent termination cap, see options list)  
Condensate “P” trap (provided for field installation)  
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3
PRODUCT DESCRIPTION Component, Controls and Connection Locations  
(Locations May Vary)  
125 SERIES  
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250 SERIES  
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300 SERIES  
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4
WATER HEATER INSTALLATION  
4.1 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.  
4.2 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 shall 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. Where required by the Canadian authority having jurisdiction, the equipment must be installed in  
accordance with the latest edition of the Installation Code for Gas Burner Appliances and Equipment CAN/CSA  
B149.1 and/or B149.2 and applicable Provincial Regulations. All appliances conform to the latest edition of the  
ASME Boiler and Pressure Vessel Code, Section IV, Part HLW.  
4.3 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.  
4.4 Handling and Location  
WARNING: Use industry standard safe rigging methods, such as including the use straps and spreader bars  
and lifting from the water heater base skid assembly, when attempting to lift or move this product. Failure to  
follow industry safe rigging methods could result in property damage, serious injury or death.  
1
Check the data decal on the appliance. Be sure the electrical, water, oil, or gas supply is adequate for the  
installation.  
2
3
Carefully remove all shipping supports and bracing.  
These units are suitable for indoor installation only.  
4. Installing the water heater on a 4 inch to 6 inch housekeeping pad is recommended to ensure proper condensate  
drainage.  
5. Locate the unit so that if water connections should leak, water damage will not occur. When such locations are  
unavoidable, install a suitable drain pan, and plumb pan to ensure adequate drainage in the event of a leak.  
Under no circumstances is the manufacturer responsible for water damage in connection with this unit, or any of  
its components. 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. Place the appliance on a level, non-combustible floor. Concrete over wood is not considered non-combustible.  
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8. Do not install on carpet or other combustible floor coverings. If installation over a combustible floor is required,  
follow these guidelines:  
Use a base of hollow clay tile or concrete blocks from 8" to 12" thick and extending 24" beyond the sides.  
Place the blocks in line so that the holes line up horizontally to provide a clear passage through the blocks.  
Install 1/2” fireproof millboard with a 20-gage sheet metal cover over the block base.  
Center the unit on the base. Also follow this procedure if electrical conduit runs through the floor, and  
beneath the appliance. A field-installed base must meet all local fire and safety code requirements.  
4.5 Service Clearances  
Allow sufficient space to provide adequate clearances on all sides for service and inspection. At least 24” above the  
water heater is required for filter replacement (if equipped) and burner/gas control service, 18” at left and right sides  
of the appliance. Optional equipment may increase the clearance requirements. Allow sufficient space for installing  
and servicing connections such as water, gas, vent, combustion air, electrical, pump and other auxiliary equipment.  
4.6 Clearances To Combustible Surfaces  
Minimum 1” clearance must be provided from any vent surface to adjacent combustible material. The minimum  
clearances to unprotected combustible material are 24” be provided at the front, 8” be provided at the rear and 8” at  
top, left and right sides of the appliance.  
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GENERAL PIPING GUIDELINES  
5.1 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.  
5.2 Building Return Piping  
To maximize water heater efficiency, connect the building return (5 gpm) directly to the return fitting located at the  
rear of the tank.  
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SINGLE WATER PIPING  
SINGLE STORAGE WATER HEATER WITH SUPPLEMENTAL STORAGE TANK  
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TWO WATER HEATERS WITH REVERSE RETURN PIPING  
6
CONDENSATE DRAIN, TRAP & DISPOSAL  
The POWER VT PLUS water heater is designed to produce significant amounts of condensate because of its high  
efficiency. Condensate occurs naturally when water vapor in combustion gases is cooled below the dew point. Two  
3/4” NPT drain connections are provided. A trap with three inches of standing water below the bottom of the heater  
(3” above the base of the I-Beam skids), and no higher than the bottom of the heater must be field installed as part of  
the condensate piping.  
WARNING: A trap with three inches of standing water as described in these instructions must be included as  
part of the condensate piping system. This trap is required to keep hazardous products of combustion from  
continually entering the room through the condensate piping. Failure to provide this trap can cause,  
personal injury, exposure to hazardous materials or loss of life.  
1. Installing the water heater on a 4 inch to 6 inch housekeeping pad is recommended to ensure proper  
condensate drainage.  
2. Attach a 3/4” CPVC Coupling and Tee to the economizer condensate drain, then use 3/4” CPVC pipe to plumb  
from the heater condensate outlet to economizer Tee, to a 3” CPVC trap and on to a suitable floor drain or  
collection system. Each condensing appliance must drain separately. Do not combine condensate drains from  
multiple condensing appliances into a single drain pipe.  
3. Each condensate drain must contain a trap or siphon/pigtail to provide at least 3 inches of standing water, to  
prevent flue gas flow through the condensate piping. To construct the trap, connect to the 3/4” condensate  
drain, route the piping downward until the standing water in the trap is not higher than the bottom of the water  
heater.  
4. Install the condensate plumbing as shown in the following diagram.  
5. All condensate plumbing must be protected from freezing. Do not locate the condensate piping such that an ice  
dam of frozen condensate can block the outlet.  
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Condensate Piping and Trap with Optional Condensate Neutralizer  
6.1 Condensate Neutralization System (optional)  
Although only slightly acidic (3-5 PH), condensate can be routed through an optional Condensate Neutralization  
System (see image below) to become pH neutral allowing for disposal into any drain or sewer system without  
concern for corrosion. Condensate slowly flows through a neutralization bath filled with renewable crushed limestone  
becoming neutralized thus avoiding chemical treatment or dilution using substantial quantities of tap water. To obtain  
a Condensate Neutralization System, please contact your local PVI representative.  
1. Follow the steps 1 through 4 in the Condensate Drain, Trap & Disposal section above.  
2. Locate the Condensate Neutralization System in the condensate piping, as shown in the FIELD INSTALLED  
CONDENSATE DIAGRAM above.  
3. Position with removable crushed limestone fill-cap in vertical position only. The bottom of the condensate  
neutralization system outlet pipe must not be higher than the bottom of the water heater.  
4. For proper operation, the water heater condensate outlet must be plumbed with CPVC plastic pipe to the lowest  
fitting of the Condensate Neutralization System, connecting to the “INLET” as shown in the graphic below.  
5. Keep the Condensate Neutralization System closed at all times, except for maintenance.  
Optional Condensate Neutralization System  
WARNING: Keep the Condensate Neutralization System closed at all times the appliance is operating. The  
system must remain closed to prevent hazardous products combustion from continually enter the room.  
Failure to keep the Condensate Neutralization System closed can cause property damage, personal injury,  
exposure to hazardous materials or loss of life.  
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7
GAS SUPPLY AND PIPING  
Verify that 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 Btuh output derates 4% per 1000 feet elevation above sea level. Consult Factory for  
installations above 2000 feet elevation.  
7.1 Gas Train and Controls Certification  
NOTE: The gas train and controls assembly provided on this unit have been tested under the applicable American  
National Standard to comply with safety and performance criteria such as proper ignition, combustion and safety  
shutdown operation.  
7.2 Gas Control Trains  
All models include gas control trains with the following components: main manual shutoff valve, two safety shutoff  
valves, proportionator regulator and a final manual valve with the manifold pressure tap on the side of the valve.  
These components may be separate or two or more may be combined in a common housing.  
CAUTION: Do not adjust or remove any screws or bolts on gas train control components which are sealed  
with a red or blue colored compound. Doing so will void all approvals and warranties.  
7.3 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.  
INLET PRESSURE  
Maximum Static Pressure (Inches-Water Column)  
Minimum Flow Pressure (Inches-Water Column)  
NAT. GAS  
14"  
LP  
14"  
11"  
4.5"  
7.4 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.  
7.5 Gas Piping Size  
Use the values in “Convert Fittings to Equivalent Straight Pipe” to add the equivalent straight pipe for each elbow or  
tee to obtain the total distance from the meter.  
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'  
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Use this corrected total distance from the meter for determining the suggested pipe size in the “Single Unit  
Installation Suggested Gas Pipe Size” table.  
SINGLE UNIT INSTALLATION SUGGESTED PIPE SIZE  
Maximum Capacity for Natural Gas*  
MBTU/HR Based on 0.5" W.C. Pressure Drop**  
Equivalent Feet  
From Meter  
1-1/4"  
860  
660  
1-1/2"  
1320  
990  
810  
690  
620  
-
2"  
2½"  
3"  
4"  
-
-
-
-
6700  
6000  
5500  
5000  
4600  
25  
40  
60  
80  
100  
125  
150  
175  
200  
2475  
1900  
1520  
1300  
1150  
1020  
950  
3900  
3000  
2400  
2050  
1850  
1650  
1500  
1370  
1280  
7000  
5300  
4300  
3700  
3250  
2950  
2650  
2450  
2280  
-
-
-
-
-
-
-
-
-
-
850  
800  
*Multiplier for Propane: 1.57  
**Multiplier for alternate pressure drops: 0.3" W.C. 0.77; 1.0" W.C. 1.41; 2.0" W.C. 2.00; and 4.0" W.C. 2.82.  
MULTIPLE UNIT INSTALLATIONS GAS PIPING 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  
369  
20  
30  
40  
50  
60  
70  
80  
90  
100  
106  
125  
95  
150  
86  
175  
79  
200  
74  
256  
205  
174  
155  
141  
128  
121  
113  
3/4  
1
697  
477  
384  
328  
292  
267  
246  
256  
210  
200  
179  
164  
333  
513  
974  
1540  
2720  
5640  
49  
138  
287  
441  
820  
1300  
2340  
4720  
1400  
2150  
4100  
6460  
11200  
974  
789  
677  
595  
543  
502  
472  
441  
410  
369  
308  
472  
871  
1400  
2500  
5130  
1 1/4  
1 1/2  
2
1500  
2820  
4460  
7900  
1210  
2260  
3610  
6400  
1020  
1950  
3100  
5400  
923  
830  
769  
707  
666  
636  
564  
1720  
2720  
4870  
1560  
2460  
4410  
9000  
1440  
2310  
4000  
8300  
1330  
2100  
3800  
7690  
1250  
2000  
3540  
7380  
1180  
1900  
3300  
6870  
1100  
1700  
3000  
6150  
2 1/2  
3
23500 16100 13100 11100 10000  
4
7.6 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.  
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7.7 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.  
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.  
2. Gas pipe size may be larger than heater connection.  
3. Installation of a union is suggested for ease of service.  
4. Install a manual main gas shutoff valve, outside of the appliance gas connection and before the appliance  
provided appliance manual shutoff gas valve, when Codes require.  
5. The gas system installer should clearly identify the emergency shut-off device.  
6. A sediment trap (drip leg) MUST be provided in the inlet of the gas connection to the unit.  
7. The code compliant vent limiters are designed and must respond to pressure changes in the installation  
environment, as opposed to outdoor pressure. For proper operation, do not connect to outdoor atmosphere.  
8
COMBUSTION AND VENTILATION AIR  
Provisions for adequate combustion and ventilation air to the mechanical room must be in accordance with Section  
5.3 “Air for Combustion and Ventilation” of the latest edition of the National Fuel Gas Code, ANSI Z223.1 and/or  
CAN/CSA B149, Installation Codes or applicable provisions of the local building codes.  
8.1 Equipment Located In Confined Spaces  
Equipment located in confined spaces requires two openings installed within 12” (30.5 cm) from the top and bottom  
of the 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.  
All Air From Outdoors:  
Each opening requires a minimum free area of 1 square inch per 4000 Btu/hr input 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 input if communicating with the  
outdoors through horizontal ducts.  
All Air From Inside The Building:  
Each opening requires a minimum free area of 1 square inch per 1000 Btu/hr input, but not less than 100 square  
inches (0.06 m2).  
Combination Of Air From The Indoors And From The Outdoors:  
Refer to National Fuel Gas Code, ANSI Z223.1 and/or CAN/CSA B149, Installation Codes or applicable  
provisions of the local building codes.  
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.  
WARNING: Adequate clean combustion air must be provided to the appliance. Under no circumstances  
should the appliance ever be under a negative pressure. Particular care should 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 chemical 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. The result of inadequate clean combustion air  
or negative pressure can be premature unwarranted product failure or unsafe operation producing carbon  
monoxide that could escape into the building. Exposure to carbon monoxide can lead to injury or death.  
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8.2 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  
Duct Size  
6” Duct  
7” Duct  
8” Duct  
9” Duct  
Max Equivalent Length  
100 feet  
130 feet  
250 feet  
450 feet  
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  
Duct Pipe:  
90º Elbow  
6” Duct  
8 feet  
7” Duct  
9 feet  
8” Duct  
10 feet  
5 feet  
9” Duct  
11 feet  
6 feet  
90º Long Radius Elbow  
45º Elbow  
5 feet  
5 feet  
5 feet  
5 feet  
5 feet  
5 feet  
The following remote air duct information is provided for use in design calculations, if needed.  
Remote Air Duct Specifications  
Input MBtu  
399  
Required Air (SCFM)  
87  
500  
108  
163  
195  
217  
750  
900  
1000  
8.3 Remote Combustion Air Cap  
A UL Listed air intake vent termination cap MUST be attached to the remote combustion air vent termination to  
adequately protect the combustion air inlet from wind and weather. A UL Listed air intake termination cap is available  
from PVI Industries and may have shipped with the water heater as a purchased option.  
8.4 Vertical or Horizontal Remote Air Duct Termination  
Air inlet and exhaust vents should terminate in the same wind pressure area whenever possible.  
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.  
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 normal snow levels.  
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Vertical Remote Air  
Horizontal Remote Air  
8.5 Remote Air Consideration for Combined Remote Air Ducting  
Each water heater MUST have separate intake piping. Consult factory for common air intake pipe sizing.  
9
VENTING  
9.1 Venting the Power VT Plus “SANI” models:  
Power VT Plus models with “SANI” in the model number are designed for operation only with stainless steel venting  
listed by UL, ULC, ETL or CSA for Category IV, positive pressure, gas appliance venting. Installation requires a field  
supplied stainless steel adapter from the 6-5/8 female economizer outlet to the specific size (six inch minimum) and  
model vent used. Follow the vent manufacturer’s instructions for installation, sealing, supporting and terminating their  
vent system. Do not use plastic venting of any type on models with SANI in the model number. Do not use a  
barometric damper with the Power VT Plus positive pressure vent.  
WARNING: On Power VT Plus models with “SANI” in the model number, use only stainless steel venting  
listed by a nationally recognized testing laboratory for Category IV, positive pressure, gas appliance venting.  
Use of plastic pipe of any type or use of venting materials other than specified in these instructions can  
result in failure of the venting system and/or exposure to carbon monoxide which can result in property  
damage, personal injury or death.  
9.2 Venting the Power VT Plus:  
The Power VT Plus (except models with “SANI” in the model number, see above) is designed for operation with a  
"positive pressure vent system" constructed of locally obtained 6" or larger schedule 40 or 80 solid CPVC pipe. Do  
not use CPVC pipe with cell/foam type construction (such as “CellCore”) or other non-solid CPVC plastic pipe. Larger  
solid CPVC pipe may be substituted, however a solid CPVC increaser from 6” to the larger size must be used for  
connection to the stainless steel 6-5/8” female flue outlet from the water heater economizer. Do not insulate the  
plastic vent pipe. Stainless steel venting listed by UL, ULC, ETL or CSA for Category IV positive pressure gas  
appliance venting may be used instead of CPVC plastic pipe venting. If such stainless steel venting is used, follow  
the vent manufacturer’s instructions for installation, sealing, supporting and terminating their vent system. Do not use  
a barometric damper with the Power VT Plus positive pressure vent.  
WARNING: On Power VT Plus, (except models with “SANI” in the model number, see above) use only solid  
CPVC pipe or stainless steel venting listed by a nationally recognized testing laboratory for Category IV  
positive pressure gas appliance venting. Use of ABS pipe, CPVC pipe, pipe with cell/foam type construction,  
plastic vent pipe other than solid CPVC or use of venting materials other than specified in these instructions  
can result in failure of the venting system and/or exposure to carbon monoxide which can result in property  
damage, personal injury or death.  
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WARNING: Do not vent this water heater into an existing or traditional gas vent or chimney or combine the  
vent with any other appliance. Such venting could result in failure of the venting system and/or exposure to  
carbon monoxide which can result in property damage, personal injury or death.  
9.3 Maximum Category IV Vent Length (Equivalent Length)  
A vertical or horizontal remote Category IV vent system must be used with this appliance. The maximum length of  
field supplied Category IV vent is shown in the chart below titled Category IV Vent Equivalent Length.  
Maximum Category IV Vent Equivalent Length  
Vent Size  
6” Vent  
7” Vent  
8” Vent  
9” Vent  
Max Equivalent Length  
100 feet  
130 feet  
250 feet  
450 feet  
Pipe fittings reduce the maximum allowable vent length. Use the Category IV vent manufacturer’s equivalent length  
deduction for all elbows, terminations, etc. If the information is not readily available from the vent manufacturer, use  
the Vent Fitting Equivalent Length chart below to find the total equivalent length for all vent fittings in your  
combustion air system. Then subtract this number of feet from the total equivalent length allowed in Maximum  
Category IV Vent Equivalent Length chart above. The sum of this calculation is the maximum length of straight vent  
allowed. If a longer length is required, repeat the calculation using a larger vent size. When using this chart, no  
additional deduction is required for the addition of the vent system terminal.  
Vent Fitting Equivalent Length  
Vent Pipe:  
90º Elbow  
6” Vent  
8 feet  
5 feet  
5 feet  
7” Vent  
9 feet  
5 feet  
5 feet  
8” Vent  
10 feet  
5 feet  
9” Vent  
11 feet  
6 feet  
90º Long Radius Elbow  
45º Elbow  
5 feet  
5 feet  
The following vent information is provided for use in design calculations, if needed.  
Venting Specifications  
Max Vent  
Press. ”W.C.  
Combustion Air  
Volume (cfm)  
Input MBtu  
399  
500  
750  
900  
1000  
136  
170  
255  
306  
340  
0.5  
0.6  
1.0  
1.2  
1.3  
9.4 CPVC Vent System Design, Construction and Assembly:  
The Power VT Plus water heater can be vented either vertically, through a ceiling or roof, or horizontally through a  
wall. The solid CPVC, (CPVC not allowed on models with “SANI” in the model number) or stainless steel venting  
listed by a nationally recognized testing laboratory for Category IV positive pressure gas appliance venting can be  
routed to the outdoors in any direction, from the flue outlet of the water heater economizer, except down. The vent  
must be installed and supported every four feet to slope downward toward the water heater vent connection with at  
least ¼ inch drop per linear foot of horizontal vent run, to allow proper drainage of accumulated condensation.  
1. Read and follow the information, instructions and warnings in “VENTING” section.  
2. Do not insulate the plastic vent pipe.  
3. Clean and deburr all solid CPVC (plastic pipe not allowed for venting models with “SANI” in the model number)  
pipe ends and the joint area and trial assemble the vent before joining with CPVC cement, following the CPVC  
cement manufacturer’s instructions for making sound air and water tight joints.  
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4. Dry-fit a solid 6” CPVC pipe into the female economizer flue outlet. Remove the pipe and apply a liberal coating  
of room temperature vulcanizing (RTV) adhesive to the inside of the stainless steel economizer flue outlet and  
to the outside of the plastic pipe. Before the RTV sets, slide the plastic coupling or elbow back into the RTV  
coated economizer flue outlet while rotating the pipe approximately 1/8 of a turn. Inspect and apply RTV to the  
inside and outside of the plastic to stainless steel joints to provide a continuous water and gas tight assembly.  
5. Drill a pilot hole through the top of the stainless steel economizer flue outlet and into the 6” CPVC pipe and  
attach with a sheet metal screw (stainless steel screws are recommended). Repeat this step adding a sheet  
metal screw to each side of this economizer flue outlet to positively attach the pipe to the flue outlet. Do not drill  
or use a screw in the bottom of the flue connector or pipe, as condensate might drip from this point.  
6. Vent support – The vent system must be supported at intervals no greater than four feet, to prevent sagging  
and distortion.  
7. Testing for leaks - All joints in the vent system must be air and water tight. After the vent is assembled, close  
the end of the vent with a taped plastic bag or some other temporary closure. With the gas supply turned off,  
energize the combustion blower to apply air pressure to the vent system. Spray each joint and vent connection  
with commercially available leak detection liquid to confirm no air is escaping from any point. Repair any leaks  
and retest. After testing is complete, de-energize the combustion blower, wipe clean the leak detection liquid  
and REMOVE the temporary vent closure.  
8. The solid CPVC vent pipe (Plastic venting is not allowed for models with “SANI” in the model number) must be  
sealed to the wall or roof at the point where it passes through the wall or roof, to prevent rain, insects or flue  
products from entering the living space.  
9. For proper vent operation and to protect the gas vent from wind and weather, attach to the outdoor end of the  
vent the UL listed vent termination supplied with the Power VT Plus water heater. This termination is required  
for proper operation and no substitution is allowed.  
10. Do not use a barometric damper with the Power VT Plus positive pressure vent.  
9.5 Vertical or Horizontal Vent Termination:  
1. The vent terminal must have a minimum clearance of 4 feet (1.22 m) horizontally from, and in no case be  
located above or below, unless a 4 foot (1.22 m) horizontal distance is maintained from electric meters, gas  
meters, regulators and relief equipment.  
2. The vent cap must terminate at least 3 feet (0.91 m) above any forced air inlet within 10 feet (3.05 m).  
3. The vent shall terminate at least 4 feet (1.22 m) below, 4 feet (1.22 m) horizontally from or 1 foot (0.3 m) above  
any door, window or building air inlet to the building.  
4. The vent system shall terminate at least 1 foot (0.3 m) above grade and at least 1 foot (0.3m) above possible  
snow accumulation levels and shall terminate at least 7 feet (2.13 m) above grade when located adjacent to  
public walkways or gathering areas.  
5. To avoid a blocked flue condition, keep the vent cap clear of snow, ice, leaves, debris, etc.  
6. The vent must not exit over a public walkway, near soffit vents or crawl space vents or other areas where  
condensate or vapor could create a nuisance or hazard or cause property or could be detrimental to the  
operation of regulators, relief valves or other equipment.  
7. A horizontal vent must extend one foot beyond the wall.  
8. A horizontal vent terminal must not be installed closer than 3 feet (0.91m) from an inside corner of an L-shaped  
structure.  
9. A vertical vent must exhaust outside the building at least 3 feet (0.91m) above the point of the exit and at least 2  
feet (0.61 m) above the highest point of the roof within a 10-foot (3.05 m) radius of the termination.  
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10. A vertical termination less than 10 feet (0.91 m) from a parapet wall must be a minimum of 2 feet (0.61 m)  
higher than the parapet wall.  
9.6 Combining Category IV Vents  
Combined Power VT Plus Category IV gas vent systems must incorporate an Exhausto or Tjernlund variable speed,  
modulating, mechanical draft inducer capable of maintaining the appropriate negative draft at the end of the common  
flue, to assure that all water heaters in the combined vent system operate with a negative draft. Do not exceed  
negative 0.25” W.C. See “Combining Vents with a Draft Inducerillustration below.  
WARNING: Do not connect multiple water heaters vents into a single unpowered or fixed speed powered  
vent. This could cause unsafe operation and the potential for poisonous carbon monoxide to enter occupied  
areas. Such improper installation can cause property damage, personal injury, exposure to hazardous  
materials or loss of life.  
Conventional Venting  
Through the Wall Venting  
Combining Vents with a Draft Inducer  
10  
OPERATING AND SAFETY CONTROLS  
WARNING: Turn off all electrical service to the appliance when accessing the limit or other controls located  
inside the control cabinet. This cabinet contains High Voltage wiring and terminals. If the electrical service  
is not turned off and these terminals are touched, a dangerous shock causing personal injury or loss of life  
could occur. Close and fasten the control cabinet cover before restoring electrical service to the appliance.  
10.1 Temperature and Pressure Relief Valve(s)  
A Temperature and Pressure Relief Valve(s) sized in accordance with the ASME Boiler and Pressure Vessel Code  
is installed in the tank.  
WARNING: Secure the relief valve pipe to a suitable floor drain such that very hot water does not openly  
splash during a significant relief valve discharge. If the relief valve pipe is not routed and secured to a  
suitable drain, hot water discharge can result in property damage, scalding and personal injury or loss of  
life.  
The drain pipe may not be smaller than the relief valve opening and must be secured to prevent it from lifting  
out of the drain under discharge pressure.  
CAUTION: Do not install a reducing coupling, valve or other restriction in the T&P relief valve(s)  
discharge line. The discharge line shall allow complete drainage of the valve and line. Relief valves should be  
manually operated at least once a year.  
Thermal Expansion - A relief valve that periodically discharges may result from thermal expansion, if the water  
heater is installed in a system closed by components, such as a backflow preventer or check valve in the cold  
water supply. These systems must be provided with means to control expansion. Contact a water heater or  
plumbing professional to resolve this situation.  
CAUTION: Do not plug the relief valve, as this will eliminate the critical water temperature and pressure  
protection it provides.  
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10.2 Operating Temperature Control  
An adjustable digital operating control is located in the front control panel. The control is factory pre-set at  
approximately 120ºF. To adjust the setpoint to deliver the desired water temperature, press and release the Set 1  
key on the face of the control. When setpoint adjustment is enabled, use the arrow keys to adjust the set point to  
the desired system temperature. See TempTrac Electronic Controller Panel in this manual for more information.  
10.3 High Water Temperature Limit Control  
Appliances are equipped with adjustable limit and high limit controls to control the maximum discharge water  
temperature. These controls are located inside the control cabinet and are accessed by removing the bottom cover.  
The high limit control is optionally available as the manual reset type and may be reset by pressing the limit reset  
button accessible through the control panel cover. Pressing the reset on the High Limit Control will not cause the  
control to reset until the water temperature has dropped below the set point of the manual reset High Limit Control.  
The Lower Limit is of the auto reset type and can be dial adjusted to operate just above the set point of the main  
Operating Temperature Control.  
10.4 Cathodic Protection  
PVI water heaters do not utilize cathodic protection. However, in hot water systems utilizing cathodic protection,  
hydrogen gas can be produced when the hot water system has not been used for a long period of time (generally  
two weeks or more). Hydrogen gas is extremely flammable. To prevent the possibility of injury under these  
conditions, one of the hot water system faucets should be opened for several minutes before using any electrical  
device connected to the hot water system. If hydrogen is present, there will be an unusual sound such as air  
escaping through the pipe as the hot water begins to flow. Do not smoke, have open flames or turn electrical  
switches on or off near the faucet at the time it is open.  
10.5 Electronic Low Water Cut-Off (Optional)  
When the water level is above the electrode position in the tank, the reset pushbutton will energize the control (LED  
will be lit). The control remains energized until the water level recedes below the electrode position (LED will not be  
lit). Unless otherwise specified, there is a three-second time delay on decreasing level. Water level must be below  
tank probe location for full three seconds before control de-energizes.  
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11  
TEMPTRAC™ ELECTRONIC CONTROLLER PANEL  
11.1 Principle Of Operation  
The water heater operates to satisfy the setpoint of the TempTrac digital control whose sensor is located near the  
top of the water heater tank. Demand (flow) will typically create a drop in temperature, thus activating the water  
heater to add heat to the stored water. This setpoint is the desired water temperature to maintain.  
11.2 Lower LED Readout  
The default display of the lower readout (Probe 1) is the stored water temperature sensed near the top of the water  
heater tank. This is used to regulate the temperature of the water heater.  
11.3 Upper LED Readout  
The default display of this readout will display “nu”. This readout can display a temperature reading from a 2nd  
probe. The 2nd probe can be installed in a thermal well (this optional probe and thermal well, with heat conductive  
paste, is custom and must be ordered from your PVI representative or directly from PVI) to remotely monitor water  
temperatures, such as blended water temperature, downstream of a thermal mixing valve or a remote storage tank.  
Both Probe 1 and Probe 2 temperatures are available for monitoring through the optional MODBUS RTU interface.  
11.4 Control Buttons  
Displays and modifies the temperature set points.  
SET  
In programming mode, it selects a parameter or confirms an operation.  
Displays and modifies the energy saving (Night Time setback) settings.  
In programming mode, it browses the parameter codes or increases a displayed value.  
UP  
Displays the working hours of the load relays.  
In programming mode, it browses the parameter codes or decreases a displayed value.  
DOWN  
CLOCK Changes lower display from the stored water temperature to current time and day.  
Changes upper display from Probe 2 temperature to Probe 3 temperature (when installed).  
EXT  
Also displays the temperature difference of the stored water temperature minus Probe 2  
temperature. In programming mode it sets the 4-20mA output (password is required).  
ON/OFF Switches the control ON or OFF.  
(See TempTrac User Manual PV500-40 for full description)  
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11.5 To View The Setpoint  
Push and release the SET key to see the set point value.  
To return to normal display, press SET + UP or wait 15 seconds without pressing any key.  
11.6 To Change The Setpoint  
Push the SET key. The upper display will show the “St1” parameter name, while the lower display will show its  
value.  
Use the UP or DOWN key to cycle through the parameter names.  
Push the SET key to modify a parameter value. The value starts flashing in the lower display.  
To change it push the UP or DOWN keys. Push the SET key again to confirm the value and pass to the setting  
of next set point.  
Repeat the operations described at points 3, 4, 5.  
To Exit: press SET + UP or wait 15 seconds without pressing any key.  
NOTE: Each point has a time out of 15 seconds. If any key is pushed within 15 seconds the controller exits the set  
points programming procedure.  
NOTE: The set value is stored even when the procedure is exited by waiting the time-out to expire.  
11.7 To Change Other Parameters  
Push the SET and DOWN arrow simultaneously for 3 seconds.  
Select the required parameter. The name of the parameter is on the upper display; its value is on the lower  
display.  
Press the SET key: the value of the parameter will start blinking.  
Use UP or DOWN to change the value.  
Press SET to store the new value and move to the following parameter.  
To Exit: Press SET + UP or wait 15s without pressing a key.  
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11.8 LED Display Alarm Messages  
Alarm messages are displayed in the upper LED readout and alternate with the default display. An alarm LED ICON  
is also illuminated. (See TempTrac User Manual PV500-40 for full description.)  
ALARM  
MESSAGE  
RECOMMENDED  
ACTION  
CAUSE  
TP1 probe failure  
TP2 probe failure  
TP3 probe failure  
RESULTS OF ALARM CONDITION  
Inlet temperature sensor is not  
connected or is reading incorrectly. Call Check wiring and sensor  
“P1”  
“P2”  
“P3”  
for heat and burner modulation output  
signal will revert to low fire.  
Terminals 14 & 17  
Temperature sensor is not connected  
or is reading incorrectly.  
Check wiring and sensor  
Terminals 15 & 17  
Temperature sensor is not connected  
or is reading incorrectly or flue gas  
temperature protection is disabled (if  
used).  
Check wiring and sensor  
Terminals 16 & 17  
High temperature limit  
setpoint exceeded  
“HA”  
“LA”  
Buzzer sounds, operation continues  
Buzzer sounds, operation continues  
Manual reset required  
Manually reset required  
Low temperature alarm  
Digital input 3 is activated  
for one or more of the  
following:  
Flame failure or any control  
component failure, if  
equipped with alarm on any  
failure option  
HP  
Unit de-energized after timer delay  
LP  
Digital input 2 is activated  
Unit de-energized after timer delay  
Buzzer sounds, operation continues  
Manually reset required  
Check wiring and sensor  
Maintenance alarm for  
output 1  
Mn1  
Maintenance alarm for  
output 2  
Mn2  
Mn3  
“rtc”  
Buzzer sounds, operation continues  
Buzzer sounds, operation continues  
Energy saving function disabled  
Check wiring and sensor  
Check wiring and sensor  
Reprogram clock  
Maintenance alarm for  
output 3  
The real time clock has lost  
its setting  
12  
REMOTE CONNECTIONS – TERMINAL STRIP  
12.1 Making BMS/BAS remote connections for analog and binary (on/off) signals  
A terminal strip for the remote connection is located behind the hinged control panel at the top of the cabinet and is  
accessed by removing the bottom cover and then removing the screws at the top of the hinged cover.  
Important: Do not use single strand bell wire for remote field connections to terminals R1-R2 and C1-C2. Use only  
multi-strand copper wire. See table below for wire length and gauge:  
Wire Gauge  
18 GA  
30 FT  
16GA  
50 FT  
14 GA  
75 FT  
12 GA  
Maximum Length  
100 FT  
WARNING: Turn off all electrical service to the appliance when accessing the remote connections located  
inside the control cabinet. These terminals are High Voltage. If the electrical service is not turned off and  
these terminals are touched, a dangerous shock causing personal injury or loss of life could occur. Close  
and fasten the control cabinet cover before restoring electrical service to the appliance.  
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12.2 The Following Describes The Functions Of Each Of These Terminals And The Factory-Installed Options  
Required To Activate The Terminals:  
Note: Terminal P1-P2 are functional only when the water heater is equipped with the factory installed options  
required to activate the terminals. Terminals R1-R2, A1-A2, C1-C2 and T1-T2 are standard pre-wired functions on  
all models.  
R1-R2: Used to activate / de-activate water heater from remote master control.  
Terminals are wired to a relay in a remote Energy Management System. When relay closes, circuit from R1 to R2 is  
completed and appliance controls are enabled. Appliance ships from factory with jumper between terminals  
Remove jumper when connecting to a remote controller.  
A1-A2: Used to activate a remote alarm, signaling shutdown of combustion control.  
Provides a maximum 10 amp relay contact closure when the flame safeguard terminates combustion due to a  
tripped safety interlock (i.e.: air proving switch, high limit switch, low water flow switch or flame sensor, etc.).  
P1-P2: Activates remote equipment and requires confirmation signal back to the appliance.  
Provides a maximum 10-amp relay contact closure to activate a remote device (i.e.: mechanical room air louvers,  
draft inducer or power vent, etc.). The remote device must send return signal via proving switch to confirming proper  
operation to terminals C1-C2, prior to the appliance being able to energize. Options Required - Consult Factory.  
C1-C2: Used for proving operation of remote device.  
Terminals are wired to a proving switch on a remote device such as a power venter. When relay closes, circuit from  
C1 to C2 is completed and appliance controls are enabled. This appliance ships form the factory with jumper  
between terminals.  
T1-T2: Used for external modulation control.  
To connect external modulation control, disconnect and cap the blue wire connected to terminal T2 and connect the  
external modulating signal to terminals T1 (positive) and T2 (negative).  
13  
SEQUENCE OF OPERATION  
1. Incoming 120VAC  
a. Full time power to the Main Control Switch  
b. Full time power to the Variable Frequency Drive  
2. Power On - When the main control switch is turned on:  
a. 120v is applied to the step-down transformer (24v)  
b. 120v is applied to the L.W.C.O. terminal L1 (if used)  
c. 120v is applied to the Fenwal Flame Safeguard Control  
d. 24v is applied to the TempTrac operating temperature control terminal L1  
3. Call For Heat - If the TempTrac operating control senses a call-for-heat condition:  
a. The High Gas Pressure and Low Gas Pressure Switch (both optional) are energized and their safe  
condition is proved.  
b. The thermostat contact on the Fenwal Flame Safeguard Control is energized.  
c. The flame control will then verify the Airflow-Proving Switch is in the open position, which must exist before  
the blower is powered.  
d. Energizing the blower should close the airflow proving switch. If the airflow-proving switch is not in the  
closed position, the flame control’s fan terminals F1-F2 will power the Variable Frequency Drive (VFD)  
blower system at low speed for pre-purge.  
e. If the airflow-proving switch does not close following the blower being energized, the flame control will  
lockout.  
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4. Proof of Air Pressure Switch - The control will look for a signal from the airflow-proving switch, indicating that  
the blower is operating:  
a. When the airflow generated by the blower is sufficient to cause the differential air switch to close, the 15 -  
second pre-purge delay will start.  
b. During this period any flue products or combustible gases which may have settled in the water heater are  
evacuated.  
5. Heat-Up - Following the pre-purge delay, the hot surface igniter will be energized:  
a. The flame control will monitor the current applied to the hot surface igniter.  
b. If the flame control determines the proving current meets the threshold, a dwell time delay starts to assure  
the hot surface igniter has sufficient time to reach ignition temperature.  
6. Ignition - When dwell time is completed a 4-second Trial for Ignition (TFI) period is initiated:  
a. The Delay-On (Low Fire Hold) Relay and the Gas Safety Valves are energized.  
b. During TFI the flame safeguard control will monitor the flame using flame rectification through the hot  
surface igniter.  
c. If the flame control senses the presence of flame before the end of the TFI period, the igniter will be de-  
energized and the flame control will continue to monitor the flame, through the igniter, until the operating  
thermostat ends the call for heat condition.  
7. Loss of Flame Signal:  
a. If the igniter fails to sense flame at any time, the igniter and gas valve will be de-energized and the flame  
control will reset and begin the call-for-heat sequence again. This will occur 3 times (one time if CSD-1)  
before the flame control will lockout.  
b. When the call for heat condition ends or flame failure occurs following the third TFI period (one time if CSD-  
1), a 30-second post-purge period will begin. This period of blower operation will exhaust any remaining  
combustion products from the system.  
8. Delay-On Relay - Once the Delay-On (Low Fire Hold) Relay has timed out, it energizes the Modulation Release  
Relay (SPDT) to enable the analog signal from the TempTrac to the VFD to regulate the speed of the blower.  
a. The TempTrac will continue to monitor the stored water temperature in the tank.  
b. When the setpoint temperature is reached the call-for-heat signal to the flame safeguard control is  
discontinued.  
c. The flame safeguard control deenergizes the VFD blower system and the gas valve, thereby suspending  
burner operation.  
d. As heat is transferred to the building, the water heater loop temperature will fall below the set point. The  
TempTrac will sense this condition and begin the call-for-heat sequence again.  
9. Flame Safeguard LED Diagnostic Indicator - If the Fenwal Flame Safeguard Control at any time during the  
operating sequence senses an improper operating state and locks out, the diagnostic red LED located on the  
control board will flash to indicate one of the following conditions exist:  
LED INDICATION  
On  
FAULT MODE  
Normal Operation  
OFF  
Internal Control Failure – check power  
Airflow Fault  
1 Flash  
2 Flashes  
3 Flashes  
4 Flashes  
5 Flashes  
6 Flashes  
Erroneous Flame Signal  
Ignition Lockout  
Hot Surface Igniter Fault  
Low Voltage (24 VAC)  
Valve Relay Problem  
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14  
INITIAL STARTUP  
14.1 Initial Startup Requirements  
Installation should be complete prior to performing initial startup; and the startup must be complete prior to placing  
the water heater into service. Starting the water heater without proper piping, combustion air, venting or electrical  
systems can be dangerous and may void the product warranty. The following startup instructions should be followed  
precisely in order to achieve safe and efficient operation to assure trouble-free service life.  
WARNING: Proper startup must be made by a qualified installer or service agency, who must read and  
follow the supplied instructions and appliance markings. Failure to complete proper startup before use,  
tampering with controls or not following all instructions and markings may damage this equipment, void  
the warranty and may result in property damage, personal injury or death.  
A Start-up Form is included with each product and must be completed by the qualified installer or service agency  
conducting the startup and must be returned to the manufacture to register the warranty. Copies are available at  
WARNING: Turn off all power to the water heater when servicing or accessing the blower drive. The blower  
drive still has power when appliance switch is off. Failure to turn off all power to the water heater can cause  
personal injury, property damage or loss of life.  
14.2 Tools and Instrumentation Required  
Stack Temperature Gauge  
Stack Draft Gauge  
Electronic Combustion Analyzer  
Manometer for checking gas pressure (2 minimum)  
AC/DC Multi-meter (with 20,000 OHM/Volt rating)  
Amp Meter  
Normal Hand Tools  
14.3 Resources  
Product Installation & Maintenance Manuals  
Start-up Report with instructions  
Local, State, & Federal Codes  
Toll Free 24-Hour Technical Support: 1-800-433-5654  
14.4 On Site Considerations  
Electrical Supply in accordance with Nameplate Rating  
Uncontaminated Combustion Air  
Adequate Fuel Supply  
Treated Water Supply (Water heaters)  
Consistent Draft  
14.5 Startup Procedure  
1
2
Carefully study the burner start-up information included in this manual.  
Fill system tank with water. Some water appliances may be equipped with an optional air vent. If venting  
through the safety valve when filling the appliance, insure gags or fixtures are removed from the safety valve  
prior to start-up. Open the safety valve to allow air in the tank to escape.  
3
4
Be sure all connections into the tank are tight, as leaks at tank fittings will damage the insulation.  
CAUTION: Conduct the following gas train leakage test before start-up, at annual intervals and prior to  
investigating the cause of any reported occurrences of delayed ignition.  
a. Using an appropriate bubble detection solution, thoroughly coat all gas train pipe connections. If any  
bubbles are detected, the leaking connection must be tightened, recoated, and rechecked to assure  
stoppage of the leak.  
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b. Attach a manometer to measure the gas pressure at the manual gas shutoff valve located just upstream of  
the gas train. Adjust gas train inlet pressure to the specified value (e.g. 14" W.C.), and tightly close the gas  
train manual shutoff valve closest to the burner.  
c. Reattach the manometer to the gas train manual shutoff valve at the burner and record the measured gas  
pressure in inches of water column (W.C.). Measure gas pressure again after 15 minutes. If gas pressure  
has increased 0.5" W.C. or more, the gas leak must be isolated to one or more of the operating gas valves.  
(For example, a solenoid actuated gas shutoff valve.) After any leaking valve is replaced, the reassembled  
gas train must be leak tested again before start-up is attempted.  
5. Remove enclosure panel cover on the appliance to expose control circuit. A wiring diagram, included in this  
packet, will show the controls used in our circuitry.  
6. Visually check that all components are intact and no damage has occurred during transit.  
7. Check all connections within the control cabinet. A loose connection could cause intermittent shutdowns.  
8. All burners will use a hot surface igniter (HSI) as the ignition source. They may use a single gas pressure  
regulator and valves, valve regulator combinations or multiple gas trains.  
9. Connect a test meter to the control for reading the flame response signal.  
NOTE: Some flame controls read the flame signal in micro amps and some in volts DC.  
10. CAUTION: Be sure the tank is filled with water. Dry firing can destroy the appliance.  
11. Check the inlet gas pressure before start-up, using a manometer or a 0 to 28" W.C. pressure gauge for inlet gas  
pressure. (This is the pressure measured before all components in the gas train.) This manometer must stay  
connected throughout the testing, as the inlet pressure must be monitored during the firing of the burner.  
Record static pressure; it must not exceed 14" W.C. Pressures above this could cause damage to the  
diaphragm in the gas valve or pressure regulator.  
12. Connect a second manometer to the manifold test port at the shutoff valve closest to the burner.  
13. Turn-off main gas shutoff valve.  
14. Disable or jumper out any BMS/BAS control interface to allow independent setup and adjustment of  
each water heater.  
15. Turn unit on using the rocker switch on the front of the control enclosure assembly. When the burner fails to  
light, the flame control will lockout.  
Start the burner in Low Fire (Burner combustion must be optimized at both Low and High Fire). To set the  
TempTrac control for manual modulation output:  
Push and hold the EXT key for more than 3 seconds. The  
displayed in the upper display, while the PAS label is shown in the lower display.  
LED switches ON and the PS4 parameter is  
Release the key, and insert the password: 3-2-1. The value of the modulation parameter PS4 will be  
displayed in the lower display. (nu) stands for not used. Return to this condition for automatic operation.  
To adjust modulation manually, push the SET key, the value starts flashing. Then use UP or DOWN keys  
to modify it. 100 = High Fire; 0 = Low Fire.  
To exit, press SET + UP or wait 30s without pressing any key.  
NOTE: After a modification, it will be possible to enter the Modulation output setting without entering the  
password for 10min. After this time you will be asked for the password again.  
16. Turn-on main gas shutoff valve.  
17. If the operating control switches are closed, the burner blower should come on and pre-purge begins.  
18. If nothing happens, check for a lockout condition and reset it by pushing the flame safeguard reset button.  
Some safety devices are wired in the operating circuit and may not indicate alarm. If no indication of alarm  
exists, check gas pressure switches, electronic low water cutoffs (if equipped) and temperature limits.  
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19. When the blower motor starts, the flame control will check for a positive air flow. If the air switch or blocked filter  
switch (if equipped) is not made the blower will stay on for a period of time then lockout. To adjust the air-  
proving switch, turn the adjustment screw counter-clockwise until the air proving light comes on, then turn the  
screw one turn counter-clockwise. The blocked filter switch (if equipped) should only be adjusted when the filter  
is new. This switch should be turned clockwise until switch makes and then two additional turns. If the gas  
valves open and close intermittently during normal operation, adjust pressure switches to increase the  
operational threshold until this condition ceases. This procedure should be followed with every burner.  
20. After the pre-purge, the flame control energizes the HSI for the heat up period, approximately 30 seconds. At  
the end of that period the gas valve is opened for approximately 4 seconds. After the burner has lit and the  
primary safety control senses a flame, the burner will remain on until the call for heat is satisfied or operation is  
interrupted by a safety device.  
21. If the burner fails to light, the flame control will lockout. When this happens press the reset button on the front of  
the control to recycle burner and check for improper combustion or week flame signal as a possible cause.  
22. Once the main burner flame is established the firing rate will be controlled by the TempTrac control. Refer to  
TempTrac manual PV500-41.  
Burner Combustion Adjustment  
Burner combustion should only be adjusted using a combustion analyzer. Do not attempt to adjust burner by  
sound or sight. With the burner firing, insert the combustion analyzer probe in the flue vent approximately two  
feet from the appliance. See Gas Train Illustration below for details.  
With the burner firing and adjusted to low fire, adjust the regulator screw clockwise to increase gas flow or  
counter clockwise to decrease flow. The desired CO2 in the combustion products should be between 8.0 and  
9.0% for natural gas, 9.5% to 10.5% for LP gas. Do not attempt to adjust combustion based on manifold  
pressure alone. Manifold pressure should only be used as a reference point.  
a. Once the desired combustion is achieved at low fire, raise the burner firing rate to high fire. Adjust the valve  
orifice clockwise to reduce the flow of gas and counter-clockwise to increase the flow of gas in order to  
maintain the desired CO2 in the combustion products between 8.0 and 9.0% for natural gas, 9.5% to 10.5%  
for LP gas.  
b. When high fire combustion has been reached and combustion is within the proper range, return to low fire  
to confirm settings again.  
c. CAUTION: If at any point of the modulation range, carbon monoxide is in excess of 300ppm, contact  
PVI Industries customer service for assistance.  
23. Enable or reconnect any BMS/BAS control interface removed prior to the setup and adjustment of each water  
heater.  
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Gas Train Illustration for Models 40 through 50  
(Optional components may not be shown)  
Gas Train Illustration for Models 65 through 100  
(Optional components may not be shown)  
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15  
TROUBLESHOOTING GUIDE  
Problem  
Probable Cause  
Power Supply  
Corrective Action  
Check fuse and/or circuit breaker. Check voltage at  
120/24V step-down transformer.  
On-Off Switch  
Check if On-Off switch is lighted.  
Check that the operating temperature control is set  
higher than the temperature of the water heater.  
Temperature Control  
Check for bad ground or bad control. Replace if  
necessary.  
Flame Safeguard Control  
Enable water heater or place jumper between  
terminals R1-R2.  
Remote enable/disable open  
Check if fan connection terminals on flame control  
is closed.  
Starting or Pre-purge  
Failure  
Combustion Air blower  
Air-proving Switch  
Check for 24V at field access terminal C2. Remote  
interlock may be open.  
Fan VFD may be defective. Verify proper voltage.  
Check switch contacts are closed.  
Check for 24V at the N.O. side of air switch.  
Check for 24V at the common side of air switch.  
Check for proper blower pressure setting – adjust if  
required. Air switch may be defective.  
Blocked Filter Switch  
(if equipped)  
Check for 24V at the N.C. side of the blocked filter  
switch. Replace filter or switch as required.  
Flame Control Pressure Switch  
Loose Wire Connections  
Check for 24V at the pressure switch terminal.  
Check connections to all components.  
Check fuse and/or circuit breaker. Check voltage at  
120/24V step-down transformer.  
Power Supply  
Check for bad ground or bad control. Replace if  
necessary.  
Flame Safeguard Control  
Check amp draw during heat-up. Replace if amps  
greater than 3.1A. Check for overheating condition  
due to damaged refractory around igniter.  
Hot Surface Igniter  
Air-proving Switch  
Gas Pressure  
Check if switch is bouncing. Adjust or replace.  
Flame Failure  
Check for proper inlet static and dynamic gas  
pressure.  
Inadequate flame signal may result from improper  
combustion. Adjust to proper CO2 levels at low fire.  
Combustion  
Grounding  
Check for proper ground from flame control to  
burner housing.  
Check all safety limits for fault condition and correct  
as required.  
Safety Limits  
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16  
REPLACEMENT PARTS  
REPLACEMENT  
PARTS  
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16.1 Control Panel  
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16.2 Control Panel Components  
(Optional components may not be included)  
Key  
No.  
Part No.  
Description  
Qty.  
U/M  
1
101947  
-
CONTROL, HOT SURFACE IGNITION FENWAL  
1
1
1
1
1
1
1
1
1
*
EA  
EA  
EA  
EA  
EA  
EA  
EA  
EA  
EA  
EA  
EA  
EA  
EA  
EA  
EA  
EA  
EA  
EA  
2
CONTROL, TEMPERATURE TEMPTRAC  
3
-
DRIVE, VARIABLE FREQUENCY AC EMERSON  
4
5613  
FUSEHOLDER, PANEL TYPE #HTB-28I  
5
5742  
FUSE, MDA 15 AMP BUSS 250V NO SUBSTITUTE  
6
113915  
58154  
102163  
105266  
116458  
102835  
70565  
70573  
75908  
73495  
73498  
109827  
75842  
LWCO, PROTODESIGN #LW-3-C-1-A-03  
7
PROBE, LWCO WARRICK #3L1D002.75 W/1/8 MPT 316 SST  
PROBE, THERMOSTAT DIXELL #18NB-NTC-25FT NICKEL BRASS  
PROBE, THERMOSTAT DIXELL #50DSS-NTC-1.5M SST  
RELAY, SPST 30A 24V OMRON #G7L-1A-TUB-J-CB-AC24 N.O.  
RELAY, TIME DELAY ON SSAC #TDU3000A 24-120 VAC/DC 1 TO 102  
SWITCH, CARLING #LTILA51-6SBLAM-NBL/125N/INDP BLACK W/AMBER  
SWITCH, SPST N.C. MOMENTARY CONTACT SELECTA #SS229  
SWITCH, SPST N.O. MOMENTARY CONTACT SELECTA #SS228  
PKG, THERMOSTAT, JUMO #60/60002277 85-180 DEG 3.3 FT CAP  
PKG, THERMOSTAT, JUMO 200 DEG AUTO 3.3 FT CAP STRPKG,  
TRANSFORMER, CONTROL GE #9T58K2876 .150KVA 120/240V 12/24V 60 HZ  
FUSE, MDA 6 AMP BUSS 250V  
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
*
1
*
*
1
1
1
1
* Contact factory for more information  
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16.3 Burner Assembly  
Optional components may or may not be shown  
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16.4 Burner Assembly Components  
(Optional components may not be included)  
Item No.  
1
Qty.  
1
PVI Part No.  
111876  
*
Description  
BLOWER, FASCO #70430069  
2
1
ASSY, BULKHEAD REFRACTORY  
BURNER, METAL PUNCHED  
3
1
*
4
6
114513  
115248  
3494  
SPACER, NYLON 1/4 ID X 1/2 OD X 11/16 MCMASTER C  
ASSY, INTAKE GAS AIR 7 OD X 1 NPT  
WASHER, LOCK 1/4 PLT  
5
1
6
14  
*
7
110698  
47384  
79524  
115769  
115770  
115786  
6011  
HARNESS, WIRING DUNGS FOR TYPE GB-ND 057  
TEE, BLACK 1 X 3/4 X 1/2  
8
1
9
REGULATOR, 1 DUNGS #FRG710/6 ZERO GOVERNOR PROP  
VALVE, GAS 1 ASCO #JB821425O 24V 60AC  
FLANGE, ADAPTER 1 OUTLET ASCO #296658-002  
SHUTTER, VALVE ASCO #HV426038001 1 TO 1 1/2 INCH  
NIPPLE, BLACK 1 X 2  
*
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
*
1
2
1
2
52823  
6163  
VALVE, SHUTOFF 1 GAS COMBU #55350 MODEL #840S  
ELL, BLACK 90DEG 1  
2
5973  
NIPPLE, BLACK 1/4 X 2  
*
101216  
101201  
*
SWITCH, PRESSURE HGP-G ANTUNES #8101111202 2 - 20 W  
SWITCH, PRESSURE LGP-G ANTUNES #8103116202 1 - 20 W  
NIPPLE, BLACK 1  
*
*
1
1
5929  
UNION, BLACK 1  
1
115255  
113571  
3475  
ASSY, BURNER EXTENSION 2 X 5 FASCO MOD 43  
GASKET, BLOWER OUTLET 4.665 ROUND AMORIM #CR-55R 1  
NUT, HEX 1/4 X 20 NC STEEL ZINC PLT  
GASKET, FLANGE BLOWER 1/8 #23 CRANGLAS  
STUD, THREADED 1/4 X 20 NC X 2 CRS GRAINGER #4REW2  
BOLT, 1/4 X 20 NC X 1 PLT HEX HEAD GR 5  
WASHER, FLAT 1/4 PLT  
1
14  
2
107449  
115745  
55854  
15607  
6012  
6
6
14  
*
NIPPLE, BLACK 1 X 3  
6014  
NIPPLE, BLACK 1 X 4  
*
109843  
5337  
VALVE, GAS 3/4 DUNGS #252605 TYPE GB-ND 057 24VAC  
VALVE, SHUTOFF 1 KEY GAS #223-122111  
REDUCER, BELL BLACK 1 X 3/4  
*
2
1
46311  
6160  
1
ELL, BLACK 90DEG 3/4  
2
5992  
NIPPLE, BLACK 3/4 X 3  
1
5928  
UNION, BLACK 3/4  
2
5991  
NIPPLE, BLACK 3/4 X 2  
1
5993  
NIPPLE, BLACK 3/4 X 4  
5969  
NIPPLE, BLACK 1/8 X 2  
*
6109  
BUSHING, BLACK 1/2 X 1/4  
*
6106  
BUSHING, BLACK 1/4 X 1/8  
*
1
6164  
ELL, BLACK 90 DEG 1 X 3/4  
1
6496  
ELL, 1/4 MPT X 1/4 COMPRESSION  
TUBING, ALUMINUM 1/4  
3.500  
3299  
* Contact factory for more information  
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17  
PERIODIC MAINTENANCE  
Listed below are items that must be checked to ensure safe reliable operations. Maintenance must be performed by  
a qualified service or maintenance provider. To ensure proper maintenance, the following instructions should be  
posted near the appliance and maintained in legible condition. Verify proper operation after servicing.  
WARNING: When servicing the controls, use exact, Factory authorized, replacement parts and label all  
wires prior to disconnection. Verify proper operation after servicing. Incorrect parts substitution and wiring  
errors can cause damage, improper operation, fire, carbon monoxide and other unexpected and unsafe  
conditions that could result in fire, injury or death.  
1. Examine the appliance and venting system at least once a year. Check more often in first year to determine  
inspection interval.  
a. Check all joints and pipe connections for tightness, corrosion or deterioration.  
b. Check the electronic-ignition system for quick ignition and a proper flame signal.  
c. Check all safety controls including thermostats for proper operation.  
d. Check safety shut-off valves for operation and tightness.  
e. Have the entire system, including, but not limited to, the burner, heat exchanger and venting system,  
periodically inspected by a qualified service agency.  
2. Exposure to Dusty or Dirty Combustion Air: An appliance installed in a dust or dirt contaminated atmosphere will  
require more frequent inspection. If equipped with a combustion air filter, the burner inspection frequency can  
be reduced, but the filter must be replaced on a 3 to 6 month schedule or more often, based on severity of  
contamination. Contaminants and non-combustible particulate matter, such as dust, dirt, dryer lint, concrete  
dust, dry wall dust or the like, can be drawn in with the combustion air and can block burner ports and cause  
unsafe operation and a non-warrantable failure. If the optional filter is installed, it is recommended that the filter  
not be removed until a suitable replacement is available. To inspect and clean the burner, a qualified  
serviceman or installer should use the procedures described in item 5 & 6 below.  
3. Any sign of soot on the heat exchanger or in the flue indicates the need for a combustion inspection. Properly  
installed and adjusted units seldom need heat exchanger cleaning. If soot has formed, the most common  
causes are restricted combustion air or excessive gas. A blocked heat exchanger can cause unsafe operation  
and will reduce efficiency. To inspect and clean the heat exchanger, a qualified service agent or installer should  
use the procedures described in item 5 & 6 below.  
4. All gaskets on disassembled components must be replaced on reassembly with exact, Factory Authorized,  
replacement parts only. Gasket kits are available from your PVI Industries® Representative or by contacting PVI  
Industries®, LLC.  
5. Burner and/or Heat Exchanger Inspection and Cleaning Procedure:  
a. Turn off main power to unit.  
b. Turn off gas supply.  
c. Write notes and/or take pictures during this process to aid in correct reassembly.  
d. Remove the hot surface igniter, (HSI) from the burner. Be very careful not to bump the igniter element due  
to the fragility of the igniter.  
e. Remove the nuts that secure the burner top plate to the burner flange and lift the burner top plate up until it  
is completely extracted from the burner.  
f. Inspect top plate refractory for damage. The refractory should provide a tight seal against the top edge of  
the burner deck. The silicone foam gasket located on the top plate flange should also be checked for  
damage or excessive compression set.  
g. With the burner top plate removed, inspect the deck surface of the burner for lent or other blockage carried  
in the fuel air stream. If blockage has accumulated, use brush to loosen debris and use a vacuum to  
remove from the burner cavities. Do not brush or scrub the metal fiber burner surface as this can cause  
permanent damage to the burner material.  
h. Replace any damaged components and reassemble in reverse order. (4-5 ft/lbs).  
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i. Cycle unit and test to verify all safety and operating controls are properly functioning and the burner top  
plate flange is free of leaks.  
6. If equipped, the combustion air filter should be replaced every six months. If filter blockage becomes excessive  
the filter safety switch will not allow the burner to fire. To avoid nuisance shutdown in dirty environments, check  
and replace filter more frequently.  
7. Inspect low water cutoffs and relief valves for proper operation at every six months, or more often if indicated by  
inspection.  
8. Keep appliance area clear and free from combustible materials, gasoline and other flammable vapors and  
liquids.  
9. Check frequently to be sure the flow of combustion and ventilation air is unobstructed to the appliance.  
10. When electrical controls are serviced or replaced refer to ELECTRICAL COMPONENT LOCATIONS for  
identification and location of components.  
11. All replacement parts are available through your PVI Industries® Dealer. If you need assistance identifying or  
contacting your local dealer, you may contact PVI Industries, LLC directly at the address and telephone number  
located on the first and last page of this manual.  
12. If the appliance is to be shut down for an extended period of time, the primary gas valve and the water supply  
should be shut off. When the appliance is returned to service, a thorough inspection of all utilities and general  
appliance condition should be conducted.  
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18  
RECOMMENDED MAINTENANCE SCHEDULE  
1. Annual Maintenance  
a. Check all joints and pipe connections for tightness, corrosion or deterioration.  
b. Check the electronic-ignition system for quick ignition and a proper flame signal.  
c. Check all safety controls including thermostats for proper operation.  
d. Check safety shut-off valves for operation and tightness.  
e. Test flame failure detection system.  
f. Test high limit and operating temperature controls.  
g. Conduct a combustion test.  
h. Perform leakage test on pilot and main gas valves.  
i.  
Test air switch in functionality.  
2. Semi-Annually  
a. Recalibrate all indicating and recording gauges.  
b. Check flame failure detection system components.  
c. Check firing rate control.  
d. Check piping and wiring of all interlocks and shutoff valves.  
e. Inspect burner components.  
f.  
Check igniter.  
g. Test high and low gas pressure interlocks.  
h. If equipped, check air filter and replace if required.  
3. Monthly Maintenance  
a. Test low-water cutoff device and alarm (if equipped).  
b. Check flue, vent, stack, or outlet dampers.  
c. Check flame signal strength.  
d. Check flame failure detection system.  
e. Check firing rate control.  
f. Listen to and visually check the pilot and main fuel valves.  
4. Daily Maintenance  
a. Check gauges, monitors, and indicators.  
b. Check instrument and equipment settings.  
5. As Required  
a. Check drip leg and gas strainers.  
b. Test flame failure detection system.  
c. Test temperature and pressure relief valves in accordance with ASME Boiler and Pressure Vessel  
Code Sections VI & VII.  
d. Tank flush and cleanout.  
41  
PV500-44U 06/12  
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PVI INDUSTRIES®, LLC 3209 Galvez Ave. Fort Worth, Texas 76111 Phone 1-800-433-5654 www.pvi.com  
42  
PV500-44U 06/12  
Download from Www.Somanuals.com. All Manuals Search And Download.  

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