U.S. Boiler Company X-PV Series Installation, Operating And Service Instructions
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U.S. Boiler Company X-PV Series Installation, Operating And Service Instructions

Cast iron, induced draft, gas fired
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Installation, Operating and Service Instructions for
X-PV
Models:
• X-PV3N
• X-PV3P
• X-PV4N
• X-PV4P
• X-PV5N
• X-PV5P
• X-PV6N
• X-PV6P
• X-PV7N
• X-PV7P
• X-PV8N
• X-PV8P

Table of Contents

1.
Product Description . . . . . . . . . . . . . . . . . . 4
2. Specifications . . . . . . . . . . . . . . . . . . . . . . . 5
3. Pre-Installation . . . . . . . . . . . . . . . . . . . . . . 6
4. Locating the Boiler . . . . . . . . . . . . . . . . . . . 7
6. Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7.
Water Piping . . . . . . . . . . . . . . . . . . . . . . . 22
8. Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . 26
9. Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
10. Start-Up and Checkout . . . . . . . . . . . . . . . 32
11. Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 36
12. Service and Maintenance . . . . . . . . . . . . 44
13. Troubleshooting . . . . . . . . . . . . . . . . . . . . 49
14. Service Parts . . . . . . . . . . . . . . . . . . . . . . . 52
Appendix A . . . . . . . . . . . . . . . . . . . . . . . . 61
Appendix B . . . . . . . . . . . . . . . . . . . . . . . . 66
Appendix C . . . . . . . . . . . . . . . . . . . . . . . . 68
Appendix D . . . . . . . . . . . . . . . . . . . . . . . . 70
TO THE INSTALLER:
Affix these instructions adjacent to boiler.
Provide model number and serial number when
seeking information and support.
TO THE CONSUMER:
Retain these instructions for future reference.
Contact heating contractor for all issues and support.
Improper installation, adjustment, alteration, service or maintenance can cause property damage, injury, or
loss of life. For assistance or additional information, consult a qualified installer, service agency or the gas
supplier. Read these instructions carefully before installing.
109838-01 - 5/20
Installation, Operating & Service Manual
X-PV
Page
!
WARNING
• Water Boiler
• Cast Iron
• Induced Draft
• Gas Fired
9700609
1

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Summary of Contents for U.S. Boiler Company X-PV Series

  • Page 1: Table Of Contents

    Installation, Operating & Service Manual X-PV Installation, Operating and Service Instructions for X-PV • Water Boiler • Cast Iron • Induced Draft • Gas Fired Models: • X-PV3N • X-PV3P • X-PV4N • X-PV4P • X-PV5N • X-PV5P • X-PV6N •...
  • Page 2 Installation, Operating & Service Manual X-PV The Massachusetts Board of Plumbers and Gas Fitters has approved these boilers. See the Massachusetts Board of Plumbers and Gas Fitters website for the latest Approval Code or ask your local Sales Representative. The Commonwealth of Massachusetts requires this product to be installed by a licensed Plumber or Gas fitter. The following terms are used throughout this manual to bring attention to the presence of hazards of various risk levels, or to important information concerning product life.
  • Page 3 Installation, Operating & Service Manual X-PV WARNING Asphyxiation Hazard. Fire Hazard. Explosion Hazard. This boiler requires regular maintenance and service to operate safely. Follow the instructions contained in this manual. • Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life.

  • Page 4: Product Description

    Installation, Operating & Service Manual X-PV Product Description This is a cast iron gas-fired boiler designed for use in forced hot water heating systems. It is intended for instal- lations where a usable chimney is not available. This boiler is vented using an approved vertical or horizontal AL29-4C stainless steel venting system, which is not included with the boiler.

  • Page 5: Specifications

    Installation, Operating & Service Manual X-PV Specifications Figure 2.1: General Configuration Table 2.2: Specifications X-PV Space Heating Ratings Connection Size Optional Approx. ‘A’ Water Direct Vent Shipping Width Content Conversion Net AHRI Weight Heating Basic Input Rating, AFUE Vent Capacity Boiler Fuel Water...

  • Page 6: Pre-Installation

    Installation, Operating & Service Manual X-PV Pre-Installation Make sure the boiler is configured for the correct WARNING gas (Natural or LP). Carefully read all instructions before installing For high altitude installation above 2,000 ft., see boiler. Failure to follow all instructions in proper Appendix B.

  • Page 7: Locating The Boiler

    Installation, Operating & Service Manual X-PV Locating the Boiler Note that if this option is exercised, the relief valve WARNING and gauge must still be installed in the location Failure to observe the following location shown in Figure 4.1. The drain valve on the left requirements could result in a fire, explosion or side of the boiler must also remain accessible.

  • Page 8: Air For Combustion And Ventilation

    Installation, Operating & Service Manual X-PV Locating the Boiler Air for Combustion and Ventilation (continued) Do not install this boiler on carpeting. This may NOTICE: If combustion air is being brought cause a fire. to this boiler using one of the Direct Vent Conversion Kits shown in Table 2.2, requirements G.
  • Page 9 Installation, Operating & Service Manual X-PV Air for Combustion and Ventilation (continued) The National Fuel Gas Code does describe some • If the total volume of both the boiler room other acceptable techniques for bringing outdoor and the room to which the openings combustion air to the boiler room, but these should connect is less than 50 cubic feet per rarely be needed and are not discussed here.
  • Page 10 Installation, Operating & Service Manual X-PV Air for Combustion and Ventilation (continued) Example: B. Using Outdoor Combustion Air (“Direct Venting”) A 105000 BTU/hr input boiler and a This method requires the Direct Vent Conversion Kit water heater are to be installed in a room shown in Table 2.2.

  • Page 11: Venting

    Installation, Operating & Service Manual X-PV Venting designed to provide a gas tight seal at all WARNING joints and seams so that flue gas does not Asphyxiation Hazard. Failure to vent this boiler enter the building. Each approved vent in accordance with these instructions could system has unique method for installation - do cause products of combustion to enter the not attempt to mix components from different...
  • Page 12 Installation, Operating & Service Manual X-PV Vent System Design (continued) Table 6.1: Summary Of Venting Options Using Indoor Combustion Air (See Appendix A for Options Using Outdoor Air) Classification Used in this Manual Horizontal Direct Exhaust Vertical Direct Exhaust Vent Option # Illustrated in Figure Structure Penetration Wall...
  • Page 13 Installation, Operating & Service Manual X-PV Vent System Design (continued) Figure 6.2: Horizontal Direct Exhaust Vent System (Vent Options 1, 2) Figure 6.4: Optional Miter Terminal Figure 6.3: Tee Terminal (X-PV3 thru X-PV6 Only) 109838-01 - 5/20...
  • Page 14 Installation, Operating & Service Manual X-PV Vent System Design (continued) • If possible, install the terminal on a wall Vertical Vent Terminal Locations (Vent Options away from the prevailing wind. Reliable 3, 4) - The lowest discharge opening on operation of this boiler cannot be the cap must be at least 2 feet above any guaranteed if the terminal is subjected to object located within 10 feet.
  • Page 15 Installation, Operating & Service Manual X-PV Vent System Design (continued) Figure 6.6: Vertical Direct Exhaust System (Vent Options 3, 4) 109838-01 - 5/20...
  • Page 16 Installation, Operating & Service Manual X-PV Vent System Design (continued) Table 6.7: Permissible Vent Systems And Principle Vent Components CONDENSATE WALL HORIZONTAL VERTICAL MANUFACTURER VENT SYSTEM SIZE TRAP THIMBLES TERMINATION TERMINATION 7393GC 9321 TEE: 7390TEE 7393GCS 5300CI (NOTE 2) SAF-T VENT 5391CI HEAT FAB EZ SEAL...
  • Page 17 Installation, Operating & Service Manual X-PV Vent System Design (continued) Figure 6.9a: Location of Vent Terminal Relative to Windows, Doors and Grades Figure 6.9b: Location of Vent Terminal Relative to Meters and Forced Air Inlets 109838-01 - 5/20...
  • Page 18 Installation, Operating & Service Manual X-PV Vent System Design (continued) Max. Overhang 0 - 12" NOT PERMITTED 12 - 48" 17 - 29" X minus 7" Greater than 48" 17 - 29" 36" Note: Overhang may not be ventilated if 'Y' is less than 48" Figure 6.9c: Location of Vent Terminal Under Overhangs 109838-01 - 5/20...
  • Page 19 Installation, Operating & Service Manual X-PV Removing Boiler From Common Chimney B. Removing Boiler From Common Chimney of the National Fuel Gas Code, ANSI Z223.1/ NFPA 54 and/or the Natural Gas and Propane When an existing boiler is removed from a Installation Code, CAN/CSA B149.1.
  • Page 20 Installation, Operating & Service Manual X-PV Removing Boiler From Common Chimney (continued) Une fois qu’il a été déterminé, selon la C. Vent System Assembly méthode indiquée ci-dessus, que chaque 1. General Assembly Notes: appareil raccordé au système a. Where the use of “silicone” is called for in the d’évacuation est mis à...
  • Page 21 Installation, Operating & Service Manual X-PV Vent System Assembly (continued) d. On the male end of the pipe, apply a ¼” 4. Complete the rest of the vent system in wide bead of high temperature silicone accordance with the vent manufacturer’s approximately ½...

  • Page 22: Water Piping

    Installation, Operating & Service Manual X-PV Water Piping A. Standard Piping WARNING Figure 7.2 shows typical boiler system • Failure to properly pipe boiler may result in connections on a single zone system. Additional improper operation and damage to boiler or information on hydronic system design may be building.
  • Page 23 Installation, Operating & Service Manual X-PV Water Piping (continued) 6. Low Water Cut-Off (factory supplied) This boiler 7. Manual Reset High Limit (Required by some is equipped with a low water cut-off (LWCO) codes) - This control is required by ASME that prevents the boiler from firing if there is CSD-1 and some other codes.
  • Page 24 Installation, Operating & Service Manual X-PV Water Piping (continued) 10. Drain Valve - The drain valve is shipped in the 2. Large Water Volume and Low Temperature boiler parts bag. Install it in the 3/4" tapping Systems - Use a system bypass if boiler is to as shown in Figure 7.1.
  • Page 25 Installation, Operating & Service Manual X-PV Water Piping (continued) If the boiler is to be used in such a system, it WARNING must be separated from the oxygenated water Oxygen contamination of boiler water will cause being heated with a heat exchanger as shown corrosion of iron and steel boiler components in Figure 7.4.

  • Page 26: Gas Piping

    Installation, Operating & Service Manual X-PV Gas Piping b. Use thread compounds (pipe dope) resistant WARNING to action of liquefied petroleum gas. • Shut off gas supply before servicing the boiler. c. Install sediment trap, ground-joint union and • All gas piping must be gas tight. Use thread manual shut-off valve upstream of boiler gas compound that is listed for gas service on all control valve.
  • Page 27 Installation, Operating & Service Manual X-PV Gas Piping (continued) WARNING • If gas pressure in the building is above ½ psig (3.5 kPa), an additional gas pressure regulator is required. Using one additional regulator for multiple gas appliances may result in unsafe boiler operation.

  • Page 28: Wiring

    Installation, Operating & Service Manual X-PV Wiring WARNING 1. Line Voltage (120 VAC) Field Connections – See • All wiring and grounding must be done in Figure 9.1 for line voltage connections. Provide a accordance with the authority having jurisdiction dedicated circuit for the boiler of 15A or greater.
  • Page 29 Installation, Operating & Service Manual X-PV Wiring (continued) c. Auxiliary Limit Jumper - Used to connect Notice: auxiliary limit device. If no such devices are • When making low voltage connections, make installed, the factory supplied jumper shown in sure that no external power source is present in Figures 9.2 and 9.3 must be installed for boiler the thermostat circuits.
  • Page 30 Installation, Operating & Service Manual X-PV Wiring (continued) Overcurrent Service Power Internal J-Box Green Ground Protection/ Switch Supply Screw Disconnect (optional) 120/60/1 (By Installer) (By Installer) Ground Terminal System On Gas Valve Circulator Circulator (By Others) Boiler Control 1 2 3 Boiler Limit Temperature L2 GND L1...
  • Page 31 Installation, Operating & Service Manual X-PV Wiring (continued) Power Supply 120 / 60 / 1 (By Installer) Internal Internal Junction Junction Overcurrent Protection / Disconnect (By Installer) Service Switch (optional) (By Installer) Boiler Control On/Off System Circulator System Circulator Line Input Neutral On/Off DHW Circulator...

  • Page 32: Start-Up And Checkout

    Installation, Operating & Service Manual X-PV Start-up and Checkout WARNING Do not leave the boiler in service if it fails any of the following start-up checks. Doing so may result in fire, explosion, or carbon monoxide (CO) poisoning. WARNING • Gas leaks may result in fire or explosion. •...
  • Page 33 Installation, Operating & Service Manual X-PV Start-up and Checkout (continued) Figure 10.3: Operating Instructions 109838-01 - 5/20...
  • Page 34 Installation, Operating & Service Manual X-PV Start-up and Checkout (continued) appliances on and off. The inlet pressure at the boiler must be within the following limits regardless of what combination of appliances is firing: Inlet Pressure (in. w.c.) Natural Gas LP Gas Minimum 11.0...
  • Page 35 Installation, Operating & Service Manual X-PV Start-up and Checkout (continued) its maximum setting, set the thermostat to call for heat. Allow the boiler to fire for at least an hour or until the odor from the cornstarch has dissipated. 3. Return the high limit and thermostat to their desired settings.

  • Page 36: Operation

    Installation, Operating & Service Manual X-PV Operation A. Controls 2. Operating Mode - Provides additional information about the current status of the 1. This boiler uses a proprietary version of the boiler. Operating mode is entered by pressing Honeywell S9361A “integrated boiler control” the I button shown in Figure 11.1.
  • Page 37 Installation, Operating & Service Manual X-PV Operation (continued) Figure 11.2: Boiler Control Menu STATUS MODE:        =Current Status (Table 11.3)  Press and Hold I, ↑, and ↓ for at least 3  Press I to enter OPERATING MODE  sec to enter ADJUSTMENT MODE        = Current Boiler Temp.      = High Limit Setting       = Current Set Point  ...
  • Page 38 Installation, Operating & Service Manual X-PV Operation (continued) Table 11.3: Status Codes Status # Description Meaning No call for heat or DHW Standby Call for heat present , but boiler is in thermal purge (See on page 40) Call for heat/DHW present but boiler temperature is above high limit (HL) setting. Waiting for Pressure Control is confirming that air pressure switch contacts are open before starting Switch to open...
  • Page 39 Installation, Operating & Service Manual X-PV Operation (continued) Table 11.5: Operating Mode Parameters Parameter # Description Meaning Boiler Temperature Current boiler water temperature measured by the control’s sensor. Current target temperature (always the same as the high limit setting un- Boiler water set point less the outdoor reset card option is installed).
  • Page 40 Installation, Operating & Service Manual X-PV Operation (continued) should be exercised before setting this value to WARNING something other than zero. Before doing so, verify Improper adjustments to control parameters that the system will permit flow (e.g. flow is not could result in unreliable boiler operation, completely cut-off by closed zone valves) and that property damage, personal injury, or loss of life.
  • Page 41 Installation, Operating & Service Manual X-PV Operation (continued) rst (Reset) - Used to reset the boiler from a bAc (Return to Status mode) - Exits adjustment hard lockout (as an alternative to momentarily mode. Any changes made to the parameters interrupting power to the control).
  • Page 42 Installation, Operating & Service Manual X-PV Operation (continued) D. Sequence Of Operation 6. The control starts an ignition spark at the pilot and applies 24 volts across the pilot valve (Refer to Figures 9.3 or 9.4 for Connection and (terminals PV and MV/PV on the gas valve). Ladder diagrams) 7.
  • Page 43 Installation, Operating & Service Manual X-PV Operation (continued) E. Safety Control Operation Air Pressure Switch (APS) - The APS proves that the fan is running before allowing the ignition sequence to proceed. Failure of this switch to close is usually the result of a problem with the vent system, such as a blockage, or a problem with the fan.

  • Page 44: Service And Maintenance

    Installation, Operating & Service Manual X-PV Installation, Operating & Service Manual SERIES 2E Service and Maintenance Service and Maintenance Important Product Safety Information: Refractory Ceramic Fiber Product WARNING Some boiler components use materials that contain refractory ceramic fibers (RCF). RCF has been classified as a possible human carcinogen. When exposed to elevated temperatures, RCF may change into crystalline silica, a known carcinogen.
  • Page 45 Installation, Operating & Service Manual X-PV Service and Maintenance (continued) A. Annual Maintenance WARNING 1. Turn off electrical power and gas supply to the • Label all wires prior to disconnection when boiler. servicing controls. Wiring errors can cause improper and dangerous operation. Verify 2.
  • Page 46 Installation, Operating & Service Manual X-PV Service and Maintenance (continued) WARNING Soot deposits in the flue passages are a sign that the boiler may be operating at high carbon monoxide (CO) levels. After cleaning the boiler of soot deposits, check the CO level in the flue gas to insure that the boiler is operating properly.
  • Page 47 Installation, Operating & Service Manual X-PV Service and Maintenance (continued) 11. Clean the flue passageways using a stiff bristle C. Service Notes brush. Be certain that all foreign material is 1. Pressure Switch – This boiler is equipped with a removed from the gaps between the pins.
  • Page 48 Installation, Operating & Service Manual X-PV Service and Maintenance (continued) Figure 12.3a: Pressure Switch Connections Figure 12.3b: Measuring Pressure Across Pressure Switch 109838-01 - 5/20...

  • Page 49: Troubleshooting

    Installation, Operating & Service Manual X-PV Troubleshooting A. Before Troubleshooting B. If The Display Is Blank The following pages contain troubleshooting 1. Check for 24 VAC on transformer secondary tables for use in diagnosing control problems. connections (pink and brown wires). If voltage When using these tables the following should be across these screws is between 18 and 30 kept in mind:...
  • Page 50 Installation, Operating & Service Manual X-PV Troubleshooting (continued) Table 13.0: Error Codes Error Code Meaning Possible Cause • Jumped air pressure switch Pressure Switch failed to open • Condensate in air pressure switch or switch tubing • Defective air pressure switch •...
  • Page 51 Installation, Operating & Service Manual X-PV Troubleshooting (continued) Table 13.1: Faults Without Error Code Present Displayed Codes Problem Possible Cause StA 1 • Thermostat/s not calling for heat Burners and • Loose connection in thermostat, zone valve end switch, or zone panel wiring. tt OFF Circulator Off •...

  • Page 52: Service Parts

    All Service Parts may be obtained through your local U.S. Boiler Company distributor. Should you require assistance in locating a U.S. Boiler Company distributor in your area, or have questions regarding the availability of products or service parts, please contact us at (717) 481-8400 or Fax (717) 481-8408.
  • Page 53 Installation, Operating & Service Manual X-PV Service Parts (continued) WARNING If base must be replaced, there is a good chance pilot assembly and pilot tubing will need to be replaced as well. Replacement pilot assemblies are shown on page 54. Also check condition of manifold and gas valve and replace if they show any signs of heat,...
  • Page 54 Installation, Operating & Service Manual X-PV Service Parts (continued) Part Number [Quantity] Description 3 Section 4 Section 5 Section 6 Section 7 Section 8 Section Gas Valve (Natural Gas), 110404-01 [1] VR8204C6000 Gas Valve (Natural Gas), 110405-01 [1] VR8304P4553 Gas Valve (LP Gas), 110406-01 [1] VR8204C6018 Gas Valve (LP Gas),...
  • Page 55 Installation, Operating & Service Manual X-PV REVISIONS REV. DATE DESCRIPTION 3/4/2020 INITIAL RELEASE Service Parts (continued) MATERIAL: UNLESS OTHERWISE NOTED: THIRD ANGLE DES: JP SCALE ALL DIMENSIONS IN INCHES. PROJECTION ITEM NUMBER: TOLERANCES: CHK: JP SIZE: C X.X ±.1 X.XXX ±.005 FIRST USE: X.XX ±.03 ANGLE ±1°...
  • Page 56 Installation, Operating & Service Manual X-PV Service Parts (continued) Part Number [Quantity] Description 3 Section 4 Section 5 Section 6 Section 7 Section 8 Section 110402-03 110402-04 110402-05 110402-06 110402-07 110402-08 Burner Cover (Natural Gas Only) 109838-01 - 5/20...
  • Page 57 Installation, Operating & Service Manual X-PV Service Parts (continued) Part Number [Quantity] Key No. Description 3 Section 4 Section 5 Section 6 Section 7 Section 8 Section Integrated Boiler Control 103968-02 [1] Transformer 106034-01 [1] Hydrolevel IDL 1200 LWCO Kit 106495-02 [1] 6D, 4C, Air Pressure Switch w Tubing...
  • Page 58 Installation, Operating & Service Manual X-PV Service Parts (continued) Part Number [Quantity] Description 3 Section 4 Section 5 Section 6 Section 7 Section 8 Section Left Jacket Panel 110418-01 [1] Right Jacket Panel Rear Jacket Panel Vestibule Jacket Panel Top Jacket Panel 110419-03 [1] 110419-04 [1] 110419-05 [1]...
  • Page 59 Installation, Operating & Service Manual X-PV Service Parts (continued) Part Number [Quantity] Description 3 Section 4 Section 5 Section 6 Section 7 Section 8 Section Water Manifold 109614-01 [1] Temperature/Pressure Gauge 105894-01 [1] 3/4" Safety Relief Valve 109038-01 [1] (30 psi) Boiler Drain Valve Obtain Locally (3/4"...
  • Page 60 Installation, Operating & Service Manual X-PV Service Parts (continued) Part Number [Quantity] Key No. Description Section Section Section Section Section Section Line Voltage Wire Harness 110423-01 [1] Low Voltage Wire Harness 109838-01 - 5/20...
  • Page 61 Installation, Operating & Service Manual X-PV Appendix A: Direct Vent Installations This Appendix describes how to bring B. Vent System Design and Assembly – combustion air directly from outside to the boiler Vent system is assembled using installer (direct venting) using the Direct Vent Conversion supplied AL29-4C stainless steel vent Kits shown in Table 2.2.
  • Page 62 Installation, Operating & Service Manual X-PV Appendix A (continued) Table A.2: Summary Of Direct Vent Options (See Section 6 for Additional Details on Vent System Installation) Classification Used in this Horizontal Direct Vent Vertical Direct Vent Manual Vent Option # Illustrated in Figure A.3, A.4 A.3, A.4...
  • Page 63 Installation, Operating & Service Manual X-PV Appendix A (continued) Figure A.4: Horizontal Direct Venting (Vent Options 5-7) 3. Permitted Intake Terminals – 4. Horizontal terminal location – Install the intake terminal to either side of the a. Horizontal venting applications use the exhaust terminal as shown in Figure A.4.
  • Page 64 Installation, Operating & Service Manual X-PV Appendix A (continued) Figure A.5: Horizontal Terminal Offsets Figure A.6: Vertical Direct Vent System (Vent Options 8-10) 109838-01 - 5/20...
  • Page 65 Installation, Operating & Service Manual X-PV Appendix A (continued) D. Air Intake System Assembly - 4. If PVC is used for the intake system, the PVC will fit over the outside of the air intake collar 1. If PVC piping is used, use PVC cement to on the boiler.
  • Page 66 Installation, Operating & Service Manual X-PV Appendix B: Instructions for High Altitude Installations (US Only) These instructions apply only to the following altitude ranges: Sea Level - 2000ft, 2001-10,200ft These instructions contain specific information to setup your boiler to ensure proper operation. As with most gas appliances, special consideration Table B.1 lists the specific differences must be given to when this boiler is installed at...
  • Page 67 Installation, Operating & Service Manual X-PV Appendix B (continued) Figure B.2: Air Intake Terminal (Installed on Air Intake Collar) WARNING • Safe operation of this boiler depends upon the use of the correct burner orifice AND pressure switch for the altitude at which the boiler is to be installed. See Table B.1 for the correct configuration. Failure to properly configure this boiler for the installation altitude could cause personal injury or death due to carbon monoxide (CO) poisoning.
  • Page 68 Installation, Operating & Service Manual X-PV Appendix C: Low Return Water Temperatures Thermal Shock: Cast iron boilers are very robust. 110°F and below return water temperatures will not cause thermal shock to U.S. Boiler castings. Condensation is a different matter: Cast iron boilers will tolerate intermittent periods of condensation but are not designed for extended condensation periods.
  • Page 69 Installation, Operating & Service Manual X-PV Appendix C (continued) Primary-Secondary Pumping: This is an improvement over simple by-pass piping to reduce condensation. Again this is a fixed system. It can not adapt to variations in temperature and flow. Best Alternative: U.S. Boiler offers a system by-pass kit [part number 107795-01] that addresses these situations.
  • Page 70 Installation, Operating & Service Manual X-PV Appendix D: Special Requirements For Side-Wall Vented Appliances In The Commonwealth of Massachusetts IMPORTANT The Commonwealth of Massachusetts requires compliance with regulation 248 CMR 4.00 and 5.00 for installation of side-wall vented gas appliances as follows: 1.
  • Page 71 Installation, Operating & Service Manual X-PV SERVICE RECORD DATE SERVICE PERFORMED 109838-01 - 5/20...
  • Page 72 Installation, Operating & Service Manual X-PV Notes U.S. Boiler Company, Inc. P.O. Box 3020 Lancaster, PA 17604 1-888-432-8887 www.usboiler.net 109838-01 - 5/20...

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