NTI Vmax VM153 Installation And Operation Manual
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NTI Vmax VM153 Installation And Operation Manual

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Vmax Boiler
Model Number: VM110, VM110P,
VM153 & VM153P
Version Date: 2018-12-12
INSTALLATION AND OPERATION MANUAL

TABLE OF CONTENTS

1.0
INTRODUCTION ................................................................................................................ 3
2.0
SPECIFICATIONS .............................................................................................................. 6
3.0
BOILER LOCATION .......................................................................................................... 7
4.0
GENERAL VENTING ....................................................................................................... 10
5.0
VENT/AIR-INLET TERMINATION CLEARANCES ..................................................... 24
6.0
CONDENSATE DRAIN .................................................................................................... 26
7.0
INSTALLING GAS PIPING .............................................................................................. 28
8.0
LIGHTING THE BOILER ................................................................................................. 30
9.0
GAS VALVE AND BURNER SET-UP ............................................................................ 33
10.0 BOILER AND HEATING SYSTEM PIPING ................................................................... 36
11.0 DOMESTIC HOT WATER (DHW) PIPING .................................................................... 52
12.0 FIELD WIRING ................................................................................................................. 55
13.0 CASCADE INSTRUCTIONS ............................................................................................ 58
14.0 WIRING SCHEMATICS ................................................................................................... 61
15.0 INSTALLATION CHECKLIST ........................................................................................ 63
16.0 ANNUAL MAINTENANCE AND INSPECTION ........................................................... 64
17.0 DISPLAY MENU GUIDE ................................................................................................. 66
18.0 TROUBLESHOOTING ..................................................................................................... 79
19.0 PARTS LIST ...................................................................................................................... 82
HAZARD SYMBOLS AND DEFINITIONS
unit may result in property damage, serious injury to occupants, or possibly death.
Danger Sign: Indicates a hazardous situation which, if not avoided, will
result in serious injury or death.
Warning Sign: Indicates a hazardous situation which, if not avoided,
could result in serious injury or death.
Caution Sign plus Safety Alert Symbol: Indicates a hazardous situation
which, if not avoided, could result in minor or moderate injury.
Caution Sign without Safety Alert Symbol: Indicates a hazardous
situation which, if not avoided, could result in property damage.
Notice Sign: Indicates a hazardous situation which, if not avoided,
could result in property damage.
This Boiler must be installed by a licensed and trained Heating
Technician or the Warranty is Void. Failure to properly install this
H
NTI # 85171

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  • Page 1: Table Of Contents

    This Boiler must be installed by a licensed and trained Heating Technician or the Warranty is Void. Failure to properly install this unit may result in property damage, serious injury to occupants, or possibly death. NTI # 85171...
  • Page 2 │ Warnings Vmax I&O Manual Read Before Proceeding If you do not follow these instructions exactly, a fire or explosion may result causing property damage, serious injury or death. FOR YOUR SAFETY, READ BEFORE OPERATING_ A) This boiler does not have a pilot. It is equipped with an ignition device which automatically lights the burner.

  • Page 3: Introduction

    1.0 INTRODUCTION General Installation Requirements The installation of your NTI Vmax gas boiler must conform to the requirements of this manual, your local authority, and the National Fuel Gas Code ANSI Z223.1 and or CAN/CGA B149 Installation Codes. Where required by the Authority, the installation must conform to the standard for “Controls and Safety Devices for Automatically Fired Boilers ANSI/ASME CSD-1.”...
  • Page 4 │ Introduction Vmax I&O Manual Vmax boilers are factory set to operate with Natural Gas; BEFORE OPERATING WITH PROPANE, the boiler must be converted using the appropriate Natural Gas to LP Conversion Kit; see below. Failure to properly convert the unit to safely operate with Propane will cause dangerous burner operation, resulting in property damage, serious injury or death.
  • Page 5 │Introduction Vmax I&O Manual IN THE STATE OF MASSACHUSETTS ONLY (a) For all horizontally vented gas fueled equipment installed in every dwelling, building or structure used in whole or in part for residential purposes, including those owned and operated by the Commonwealth and where the side wall exhaust vent termination is less than seven (7) feet above finished grade in the area of the venting, including but not limited to decks and porches, the following requirements shall be satisfied: INSTALLATION OF CARBON MONOXIDE DETECTORS At the time of installation of the side wall...

  • Page 6: Specifications

    │ Specifications Vmax I&O Manual 2.0 SPECIFICATIONS Table 2-1 Vmax Specifications DESCRIPTION VM110 VM153 VM110P VM153P CSA Input Modulation 13.8 - 110 15.4 - 154 13.8 - 110 15.4 - 154 [MBH] DOE Heating Capacity [MBH] Net I=B=R Rating [MBH] DOE AFUE Boiler Water Connections –...

  • Page 7: Boiler Location

    │Boiler Location Vmax I&O Manual 3.0 BOILER LOCATION In all cases, the Vmax boiler must be installed indoors in a dry location where the ambient temperature must be maintained above freezing and below 100F [38C]. All boiler components must be protected from dripping, spraying water, or rain during operation and servicing.
  • Page 8 │ Boiler Location Vmax I&O Manual Figure 3-1 Closet Installation, Minimum Clearances Min. 1” clearance for hot water and vent pipes Top ventilation opening Max. 6” below ceiling / top Top = 12” Ventilation air opening per 1000 Btu/hr, min. 100in Removable surface / closet door Ventilation air...
  • Page 9 │Boiler Location Vmax I&O Manual Figure 3-2 Wall Mounting Instructions  Failure to follow instructions may Leave the Top Wall-mount Bracket (A) intact result in fire, serious injury, or death. and remove the Bottom Wall-mount Bracket (B) that is attached to the bottom-back of the This unit requires two people to lift it boiler.

  • Page 10: General Venting

    │ General Venting Vmax I&O Manual 4.0 GENERAL VENTING The Vmax is certified as a “Category IV” boiler requiring a “Special Venting System” designed for pressurized venting. The Exhaust Vent must be piped to the outdoors, using the vent materials and rules outlined in this section.
  • Page 11 │General Venting Vmax I&O Manual Direct Vent Installation (Best Practice) When installed as a Direct Vent boiler the combustion air-inlet must also be piped directly to the outdoors using the methods described in this section and in accordance with the National Fuel Gas Code, ANSI Z223.1 (U.S.) or CSA B149.1 (Canada) and local requirements.
  • Page 12 │ General Venting Vmax I&O Manual Mandatory Pre-commissioning Procedure for Plastic Venting (PVC or CPVC) Do not apply power to the boiler prior to Step 4 in the Mandatory Pre-commissioning Procedure for Plastic Venting. 1) Working with the power turned off to the boiler, completely install the vent and air-intake system, securely cementing joints together.
  • Page 13 │General Venting Vmax I&O Manual Figure 4-2 (a) Universal Exhaust-vent & Air-inlet Appliance Adapter Gasket Identification and Pipe Insertion Depth Upper Gasket – 3.5” OD Seal 2.36” (CPVC/PVC) use with CPVC (PVC for Air-inlet) 3.46” (PP) Middle Gasket – 3.14” OD Seal use with Polypropylene 4.17”...
  • Page 14 │ General Venting Vmax I&O Manual Figure 4-3(b) Near Boiler Venting (CPVC) Figure 4-3(a) Near Boiler Venting (PVC) Swing Joint to attain slope in horizontal runs PVC Air-inlet Pipe* Swing Joint to attain slope in horizontal runs PVC Exhaust Vent PVC Coupling CPVC Exhaust Vent CPVC Transition Pipe...
  • Page 15 │General Venting Vmax I&O Manual Vent/Air-inlet Pipe Material Table 4-2 Approved Vent and Air-inlet Pipe Material Venting System Standards 2, 3 Items Materials Canada United States PVC - DWV ANSI/ASTM D2265 All Vent and Air-Inlet materials installed on gas PVC Schedule 40 ANSI/ASTM D1785 Vent Piping fired appliances in CAN/US...
  • Page 16 Kits certified with the Vmax are listed in Table 4-5 and available from the manufacturers listed in Table 4-4. Kits with an NTI part number listed in Table 4-5, are available directly from NTI. Table 4-4 Optional Termination Kit OEMs...
  • Page 17 Supplier p/n Figure Size Compatibility Roof Wall 2” 196984 IPEX Low Profile   4-4(b), 4-6(c) (Wall) 3” 196985 (NTI p/n 84357) 2” 196125 PVC/CPVC IPEX Concentric 4-4(c), 4-5(c),   196116 (NTI p/n 82666) 4,5,6,7 (Wall/Roof) 4-6(b), 4-7(b) 3” 197117 PolyPro®...
  • Page 18 │ General Venting Vmax I&O Manual Sidewall Venting Options – Direct Vent Installation Figure 4-4 (a) Two-pipe Termination (Sidewall) Figure 4-4 (b) Low Profile Termination (Sidewall) 3” IPEX Low Profile Termination Exhaust must terminate a minimum of 18” above Air-inlet illustrated;...
  • Page 19 │General Venting Vmax I&O Manual Roof Venting Options – Direct Vent Installation Figure 4-5 (a) Two-pipe Termination (Roof) Figure 4-5 (b) Two-pipe Termination (Roof/Sidewall) Exhaust must terminate a Exhaust must terminate a minimum of 18” above the Air- minimum of 12” above snow inlet termination;...
  • Page 20 │ General Venting Vmax I&O Manual Sidewall Termination Details – Direct Vent Installation Figure 4-6 (b) IPEX Concentric Termination Figure 4-6 (a) Two-Pipe Termination (Sidewall) (Sidewall) Horizontal 4-12” or greater than 36” Refer to documentation included with termination kit for complete installation instructions.
  • Page 21 │General Venting Vmax I&O Manual  Roof Termination Details – Direct Vent Installation Figure 4-7 (a) Two-Pipe Termination (Roof) Figure 4-7 (b) IPEX Concentric Termination (Roof) Exhaust Refer to documentation included with termination kit for Vent Screen complete installation instructions. Vent pipe piece to retain vent screen Vent pipe piece to...
  • Page 22 Combustion air containing chemicals such as chloride, fluoride, bromine or iodine or dust and debris will cause corrosion damage of the heat exchanger voiding your NTI warranty. Refer to Table 4-1 for a list of corrosive products and contaminants sources to avoid.
  • Page 23 │General Venting Vmax I&O Manual Figure 4-8 Venting Below Grade For installations that exit the wall below grade: Exhaust 1. Excavate site to a point below where the pipes are to exit as shown. 2. Ensure the wall is fully sealed where the pipes Air-inlet penetrate.

  • Page 24: Vent/Air-Inlet Termination Clearances

    Condensate Drain│ Vmax I&O Manual 5.0 VENT/AIR-INLET TERMINATION CLEARANCES The quick reference table below is to be read in conjunction with the numbered notes as indicated, Figures 5-1 and 5-2, and the Venting Rules and Guidelines in Section 4.0. The instructions detailed in this section are a combination of Vmax specific and National Gas Code restrictions.
  • Page 25 │Condensate Drain Vmax I&O Manual Figure 5-1 Termination Clearance Quick Reference Diagram (See Table 5-1) Illustrations of Termination Clearances Figure 5-2 Sidewall Termination (See Table 5-1) Clearances “F” and “G” Canada – Minimum 3 ft. [915 mm] The US – Minimum 1 ft. [305 mm] Two-Pipe Termination Clearance “Q”...

  • Page 26: Condensate Drain

    Condensate Drain│ Vmax I&O Manual 6.0 CONDENSATE DRAIN The Vmax boilers produce liquid condensate in the heat exchanger and venting system as a product of combustion. Steps must be taken to ensure condensate does not collect in the venting system; therefore, all exhaust piping must slope back to the boiler a minimum ¼...
  • Page 27 │Condensate Drain Vmax I&O Manual Figure 6-1 Condensate Drain Piping Inlet Gasket Inlet Condensate Trap Boiler Condensate Drain Outlet  Cleanout Cap  Inlet Gasket Outlet Gasket Ball-float Outlet Retaining Nut Corrugated Outlet Tube  Inlet Retaining Nut firmly tightened ...

  • Page 28: Installing Gas Piping

    Ensure that:  The gas line connection to the boiler does not apply any weight to the gas valve. NTI recommends using approved flexible gas piping (if acceptable by local codes) to connect the boiler to the gas supply (see Figure 7-1 for details).
  • Page 29 │Lighting the Boiler Vmax I&O Manual When performing a pressure test on the gas line piping, be sure the boiler is disconnected or isolated if the test pressure is expected to exceed 1/2 PSI (14 in. w.c.), as damage to the gas valve could occur resulting in fire, property damage, serious injury or death.

  • Page 30: Lighting The Boiler

    Lighting the Boiler│ Vmax I&O Manual 8.0 LIGHTING THE BOILER Before Start-up refer to Mandatory Pre-commissioning Procedure for Plastic Venting in Section 4.0. Failure to follow these instructions can result in explosions, injury or death. Prior to turning the gas supply on and lighting the boiler, ensure all aspects of the installation are complete and in conformance with the instructions provided in this manual, including the Vent/Air-inlet, Condensate Drain, and System Water Piping.
  • Page 31 Volts potential which would result in an EXTREME ELECTRICAL SHOCK possibly causing serious injury or death. If the unit fails to light consistently and smoothly, contact NTI for technical assistance at 1-800-688-2575. Never allow the boiler to operate if the ignition or operation of the burner is rough or erratic.
  • Page 32 Lighting the Boiler│ Vmax I&O Manual Turning Off the Boiler 1. Set the thermostat to the lowest setting, and then turn off all power to the boiler. 2. Turn the gas shutoff valve to the off position.

  • Page 33: Gas Valve And Burner Set-Up

    │Gas Valve and Burner Set-up Vmax I&O Manual 9.0 GAS VALVE AND BURNER SET-UP Set-up of the Vmax gas valve must be performed by a licensed Gas Technician. Failure to perform the set-up correctly may result in incorrect operation, component failure, property damage, serious injury or death.
  • Page 34 CO and CO values are lower than the values obtained during maximum modulation, per notes in Table 9-1. If not, do not adjust further, contact NTI for assistance. Flue Gas Analysis and Adjustment Each Vmax is factory set to operate with Natural Gas, for boilers field converted to operate with Propane Gas, a flue gas analysis and adjustment is mandatory.
  • Page 35 │Gas Valve and Burner Set-up Vmax I&O Manual Figure 9-1 Gas Valve and Venturi Assembly Line Pressure Test Port Throttle / Input Adjustment Screw Gas Valve Manifold Pressure Test Port DO NOT Adjust Venturi...

  • Page 36: Boiler And Heating System Piping

    For retrofits, all system piping, including radiators, must be cleansed of build-up including sludge and scale. All systems, old and new, must be cleansed to remove flux, grease and carbon residue; NTI recommends cleaning the boiler system with “Fernox F3 Cleaner.” For retrofit applications with heavy limescale and sludge deposits, a heavier duty cleaner may be required;...
  • Page 37 Note: the use of glycol may reduce the usable output capacity of the boiler, thus requiring the unit to be “down-fired” by limiting the maximum operating capacity and/or the maximum water temperature. NTI recommends against exceeding 35% concentration of glycol.
  • Page 38 │ Cascade Instructions Vmax I&O Manual Near Boiler Piping (Central Heating – CH) Figure 10-2 (a) VM110 Top – Option A Figure 10-2 (b) VM110 Top – Option B Auto Air Vent Auto Air Vent (factory supplied) (factory supplied) 1x1/2x1” Brass Tee 1x1/2x1”...
  • Page 39 │Cascade Instructions Vmax I&O Manual Figure 10-3 VM110P, VM153 & VM153P Top Auto Air Vent (factory supplied) 30 PSI Relief Valve (factory supplied) 3/4x1/2x3/4” Brass Tee (factory supplied) 3/4” Brass Street Elbow (factory supplied) 150 PSI T&P Relief Valve (factory supplied) Note: VM110P &...
  • Page 40 │ Cascade Instructions Vmax I&O Manual Figure 10-5 VM153 Bottom IWH Supply Boiler Inlet IWH Return Condensate Drain Pressure & Boiler Outlet Temperature Gauge (factory supplied) Tee Fitting – Typical (field supplied) Bushing – Typical (field supplied) Figure 10-6 VM153P Bottom Boiler Inlet DHW Out Condensate Drain...
  • Page 41 │Cascade Instructions Vmax I&O Manual Boiler System Plumbing Vmax boilers use a low mass heat exchanger that requires forced water circulation any time the burner is operating. To ensure the minimum flow rate is attained, carefully following the plumbing instructions in this section.
  • Page 42 Contractor modifications to these instructions may be required, based upon existing piping and system design; consult NTI for required assistance (1-800-688-2575).
  • Page 43 │Cascade Instructions Vmax I&O Manual Figure 10-8 VM110 Plumbing Schematic – Single CH Pump w/ Indirect Fired Water Heater (Option A) Figure illustrates the basic plumbing requirements for a VM110 boiler installation with a single Central Heating circulator, and an Indirect Fired Water Heater installed using Option A.
  • Page 44 │ Cascade Instructions Vmax I&O Manual Figure 10-9 VM110 Plumbing Schematic – Single CH Pump w/ Indirect Fired Water Heater (Option B) Figure illustrates the basic plumbing requirements for a VM110 boiler installation with a single Central Heating circulator, and an Indirect Fired Water Heater installed using Option B.
  • Page 45 │Cascade Instructions Vmax I&O Manual Figure 10-10 VM110 Plumbing Schematic – Multiple CH Pumps w/ Indirect Fired Water Heater Figure illustrates the basic plumbing requirements for a VM110 boiler installation with multiple Central Heating circulators, and an Indirect Fired Water Heater.
  • Page 46 │ Cascade Instructions Vmax I&O Manual Figure 10-11 VM153 Plumbing Schematic – Single CH Pump w/ Indirect Fired Water Heater Figure illustrates the basic plumbing requirements for a VM153 boiler installation with a single Central Heating circulator, and an Indirect Fired Water Heater. Refer to Figures 10-3 and 10-5 for boiler fitting identification.
  • Page 47 │Cascade Instructions Vmax I&O Manual Figure 10-12 VM153 Plumbing Schematic – Multiple CH Pumps w/ Indirect Fired Water Heater Figure illustrates the basic plumbing requirements for a VM153 boiler installation with multiple Central Heating circulators, and an Indirect Fired Water Heater.
  • Page 48 │ Cascade Instructions Vmax I&O Manual Figure 10-13 VM110P Plumbing Schematic – Single CH Pumps Figure illustrates the basic plumbing requirements for a VM110P boiler installation with single Central Heating circulators. . Refer to Figures 10-3 and 10-4 for boiler fitting identification.
  • Page 49 │Cascade Instructions Vmax I&O Manual Figure 10-14 VM110P Plumbing Schematic – Multiple CH Pumps Figure illustrates the basic plumbing requirements for a VM110P boiler installation with multiple Central Heating circulators. Refer to Figures 10-3 and 10-4 for boiler fitting identification.
  • Page 50 │ Cascade Instructions Vmax I&O Manual Figure 10-15 VM153P Plumbing Schematic – Single CH Pump Figure illustrates the basic plumbing requirements for a VM153P boiler installation with a single Central Heating circulator. Refer to Figures 10-3 and 10-6 for boiler fitting identification.
  • Page 51 │Cascade Instructions Vmax I&O Manual Figure 10-16 VM153P Plumbing Schematic – Multiple CH Pump Figure illustrates the basic plumbing requirements for a VM153P boiler installation with multiple Central Heating circulators. Refer to Figures 10-3 and 10-6 for boiler fitting identification.

  • Page 52: Domestic Hot Water (Dhw) Piping

    │ Cascade Instructions Vmax I&O Manual 11.0 DOMESTIC HOT WATER (DHW) PIPING DHW Description of Operation Vmax Plus models, VM110P & VM153P, incorporate a Stainless Steel 16 gallon DHW storage tank with an internal Stainless Steel heat exchanger coil (Indirect Fired Hot Water Heater). This allows the Vmax Plus to heat DHW without the need for a separate water heater.
  • Page 53 │Cascade Instructions Vmax I&O Manual Safe Temperatures for Potable Water Two factors used to determine safe hot water temperatures are Legionella and scalding. Potable water needs to be stored at temperatures hot enough to limit the growth of Legionella, yet be cool enough to prevent scalding. Since both hazards present a potential risk to the user, they must be monitored and controlled.Table 11-1 indicates how water temperature affects Legionella bacteria and contributes to scald injury.
  • Page 54 │ Cascade Instructions Vmax I&O Manual Legislation and Guidelines - At the time this document was written, standards and guidelines regulating the prevention of Legionella in the United States and Canada were mostly voluntary. The American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.

  • Page 55: Field Wiring

    │Cascade Instructions Vmax I&O Manual 12.0 FIELD WIRING All wiring must be in accordance with the Canadian Electrical code, CSA C22.2 and any applicable local codes. Ensure that the wiring complies with this manual. The boiler must be electrically grounded in accordance with the National Electrical Code ANSI/NFPA 70, local codes, and/or the Canadian Electrical Code CSA C22.1.
  • Page 56 Tank Thermostat / Sensor – Connect the contacts of a DHW Tank Thermostat, or leads of an approved DHW Tank Sensor (NTI p/n: 84632), to terminals 3 and 6. When using a Thermostat, set DHW mode = 2 (menu setting 2-08). When using a Sensor, set DHW mode = 1.
  • Page 57 │Cascade Instructions Vmax I&O Manual Figure 12-2 Field Wiring ECM Pumps – due to the large inrush current of ECM pumps, they should only be switched via an isolation relay, not directly via the boiler controller. Powering ECM pumps directly will lead to premature failure of the boiler controller’s pump relay contacts.

  • Page 58: Cascade Instructions

    │ Cascade Instructions Vmax I&O Manual 13.0 CASCADE INSTRUCTIONS The Vmax controller has the internal capacity to cascade (lead-lag / stage) up to 16 Vmax boilers, without the use of an external controller. Use the instructions detailed in this section to set-up and install the cascade system. Vmax Plus (VM110P &...
  • Page 59 Plumbing – install the boilers in parallel in a primary/secondary plumbing configuration as illustrated in Figure 13-1. System Sensor – install a system sensor (NTI p/n: 84010) on the outlet (supply) pipe feeding the heating system, see Figure 13-1. Wire the system sensor to terminals 3 and 4 of the Managing Boiler (left boiler in illustration).
  • Page 60 │ Cascade Instructions Vmax I&O Manual Emergency Setpoint – establishes an emergency (back-up) boiler operating setpoint in the event communication is lost between boilers, or if the system sensor is not connected. Set via Installer menu setting 2-21 of each boiler in the cascade.

  • Page 61: Wiring Schematics

    │Wiring Schematics Vmax I&O Manual 14.0 WIRING SCHEMATICS Figure 14-1 Vmax Connection Diagram...
  • Page 62 │ Wiring Schematics Vmax I&O Manual Figure 14-2 Vmax Ladder-Logic Diagram...

  • Page 63: Installation Checklist

    │Installation Checklist Vmax I&O Manual 15.0 INSTALLATION CHECKLIST Installation  1. If operating on Propane Gas, convert boiler using appropriate Conversion Kit. See Table 7-1.  2. Locate the boiler in accordance with Section 3.0 of this manual.  3. Install the Vent/Air-inlet piping in accordance with Sections 4.0 and 5.0 of this manual. Ensure all joints are secured and cemented properly.

  • Page 64: Annual Maintenance And Inspection

     10. Listen for water flow noises indicating a drop in boiler water flow rate. Important - The hydronic system may need to be flushed to eliminate hard water scale (Use Fernox DS-40 Descaler, NTI PN: 83450).  11. Verify proper operation after servicing.
  • Page 65 │Annual Maintenance and Inspection Vmax I&O Manual Refractory Ceramic Fibers (RFC) Personal Protective Equipment Recommended - Read the following warnings and handling instructions carefully before commencing any service work in the combustion chamber. The insulating material on the inside of the burner plate contains Refractory Ceramic Fibers and should not be handled without personal protective equipment.

  • Page 66: Display Menu Guide

    │ Display Menu Guide Vmax I&O Manual 17.0 DISPLAY MENU GUIDE Initial Power-up Immediately following power-up of the boiler, the display reads, “conn”, indicating it is connecting to the controller; this is followed by a momentary reading of the display software version, e.g. init d349. After which the controller performs a de-air sequence that is designed to purge air from the boiler water.
  • Page 67 │Display Menu Guide Vmax I&O Manual Figure 17-2 Control Console – Main Screen Water pressure Temperature units Water pressure units Boiler outlet temperature Faucet – flashes OD reset indicator – during DHW demands illuminates when OD Radiator – flashes sensor is enabled during CH demands No flame –...
  • Page 68 0⁰F or less. DHW temperature – displays the temperature reading from; (i) Tank Sensor (NTI p/n: 84632) located in an external IWH or (ii) Tank Sensor (NTI p/n: 85139) located on the internal the IWH of a Vmax Plus 1-03 boiler.
  • Page 69 │Display Menu Guide Vmax I&O Manual Installer Menu The Installer Menu allows access to all settings for adjustment, as well as viewing of statistical data for troubleshooting. Access the Installer Menu from any screen by pressing the MENU and OK buttons simultaneously until “2-01”...
  • Page 70 │ Display Menu Guide Vmax I&O Manual Factory Setting Description Setting CH setpoint differential – establishes how much the boiler outlet temperature must exceed the CH setpoint before the burner is turned off. Also establishes how much the boiler outlet temperature must 2-02 11⁰F drop below the CH setpoint before the burner is turned on.
  • Page 71 │Display Menu Guide Vmax I&O Manual Factory Setting Description Setting Minimum firing rate – allows the installer to increase the minimum modulation/firing rate of the 2-12 boiler; this may be necessary for troubleshooting. Range = 20-44% Maximum firing rate CH – allows the installer to decrease the maximum modulation/firing rate of 2-13 the boiler when operating on a central heat demand;...
  • Page 72 │ Display Menu Guide Vmax I&O Manual Factory Setting Description Setting Lockout History – displays the last 16 lockouts (Loc) and the time interval between each. The most 2-34 recent lockout is displayed first; see description below. Blocking Error History – displays the last 16 blocking errors (Err) and the time interval between 2-35 each.
  • Page 73 │Display Menu Guide Vmax I&O Manual Figure 17-5(c) Lockout and Error History Navigation (End) End – indicates that you have reached the end of the recorded lockout or error messages. OK button – press to exit the 2-34 or 2-35 History submenu.
  • Page 74 │ Display Menu Guide Vmax I&O Manual Figure 17-7 Blocking Error Navigation Err – indicates the boiler has a blocking Error code - see Table error. 17-3 for description. Installer Menu – press and hold MENU and OK buttons to view User Menu –...
  • Page 75 UPS (Uninterruptible Power Supply). If source of problem cannot be located, replace controller. Limit Circuit Open (Safety) – see “Loc 5” Controller Malfunction – contact NTI, check field wiring, replace controller. Loc 8-9 Outlet Sensor Fault – controller has sensed an invalid reading at the Supply/Outlet sensor; check cable, Loc 10 then replace sensor [see Figure 19-1(a), item 15].
  • Page 76 Flame present before ignition – check flame sensor (replace); check condensate drain for blockages; Loc 28 increase post purge setting (Installer Menu setting 2-30). Controller Malfunction – contact NTI, check field wiring, replace controller. Loc 29-30 Flame lost three times during one demand – see Loc 1.
  • Page 77 Vmax I&O Manual Code Description Controller Malfunction – contact NTI, check field wiring, replace controller. Err 88-92 Appliance Type – the appliance type stored in the display does not match the appliance type stored in the controller. Set the appropriate appliance type using the procedure described under “Controller Err 93 Replacement Instructions”;...
  • Page 78 Vmax I&O Manual Controller Replacement Instructions This section provides important information necessary to successfully replace the boiler controller, NTI 84712, in the event the original controller fails. The replacement controller must be field configured to operate on the Vmax boiler model it is being installed on. This is achieved by adjusting the controller’s Appliance Type setting.

  • Page 79: Troubleshooting

    │Parts List Vmax I&O Manual 18.0 TROUBLESHOOTING Observe the following precautions when servicing the boiler. Failure to comply with these may result in fire, property damage, serious injury or death. Servicing the Boiler  Disconnect or shutoff all energy sources to the boiler: 120VAC power, water and gas. ...
  • Page 80 Indirect Tank with Tank Sensor (DHW Mode = 1) – recommended setting = 130 to 140ºF. o Indirect Tank with Tank Thermostat (DHW Mode = 2) – recommended setting = 160 to190ºF.  Vmax VM110P – DHW flow rate is too great; NTI does not recommend exceeding 3.8 . If USGPM necessary, restrict overall DHW flow rate.
  • Page 81 │Parts List Vmax I&O Manual Table 18-1 Thermistor Resistance vs. Temperature Resistance Ohms (Ω) Resistance Ohms (Ω) Temp °F (°C) Temp °F (°C) -22 (-30) 176,133 122 (50) 3,603 -4 (-20) 96,761 131 (55) 2,986 14 (-10) 55,218 140 (60) 2,488 32 (0) 32,650...

  • Page 82: Parts List

    │ Parts List Vmax I&O Manual 19.0 PARTS LIST For a list of parts that corresponds to the item numbers in the callouts, refer to Table 19-1. Note that some item numbers may appear more than once in the parts list depending on which model number is being referenced. Building Owners - Replacement parts are available from your stocking wholesaler.
  • Page 83 │Parts List Vmax I&O Manual Figure 19-1(b) Heat Exchanger, Water Piping & Sensors (VM110P)
  • Page 84 │ Parts List Vmax I&O Manual Figure 19-1(c) Heat Exchanger, Water Piping & Sensors (VM153)
  • Page 85 │Parts List Vmax I&O Manual Figure 19-1(d) Heat Exchanger, Water Piping & Sensors (VM153P)
  • Page 86 │ Parts List Vmax I&O Manual Figure 19-1(e) Cabinet & Controls (VM110P illustrated)
  • Page 87 │Parts List Vmax I&O Manual Figure 19-1(f) Gas Train (All VM153 & VM153P; VM110 & VM110P post s/n 101324)
  • Page 88 │ Parts List Vmax I&O Manual Figure 19-1(g) Gas Train (VM110 & VM110P pre s/n 95975) Figure 19-1(h) Installation Kit Box (All Vmax) VM110P VM110 VM110P & VM153P VM110P VM153P & VM153 Common VM110, VM110P, VM153 & VM153P...
  • Page 89 │Parts List Vmax I&O Manual Table 19-1 Parts List: Vmax Series Item Part # Model Description 84541 VM110, VM110P Premix Burner 85453 VM153, VM153P Premix Burner 84542 VM110, VM110P Premix Burner Gasket 84548 VM153, VM153P Premix Burner Gasket 84441 VM110(P), VM153(P) Blower Gasket 85206 VM110(P) (pre s/n 95975)
  • Page 90 │ Parts List Vmax I&O Manual Item Part # Model Description Elbow, Brass, Street 90, ¾” 84479 VM110(P), VM153(P) 84545 VM110, VM110P Burner Plate Gasket 84544 VM110, VM110P Burner Plate Ceramic Disc 85455 VM153, 153P Burner Plate Insulation & Gasket 84543 VM110, VM110P Burner Plate...
  • Page 91 │Parts List Vmax I&O Manual Item Part # Model Description VM110(P), VM153(P) Control Panel Cover VM110(P), VM153(P) Control Panel 85167 VM110 Circulator Inlet/Outlet Gasket, VM110 85113 VM110 Circulator Check Valve, VM110 84918 VM110(P), VM153(P) Fuse, LFT 3.15, 250V Bushing, Brass, 1 x ¾” NPT, VM110 82869 VM110 VM110(P), VM153(P)
  • Page 92 VM110(P) (post s/n 101324) 85446-1 NG to LP Conversion Kit VM153(P) (All) Cap, Brass ¾” FPT 83790 VM110P, VM153P Visit us online NTI Boilers Inc 30 Stonegate Drive, Saint John, NB E2H 0A4 Canada Technical Assistance: 1-800-688-2575 Fax: 1-506-432-1135 www.ntiboilers.com...

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