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FLOWMAX Technologies FLOWMAX-120 - User Manual

FLOWMAX Technologies FLOWMAX-120
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Installation, operating, commissioning and maintenance instructions.
Water heaters for other than recreational vehicle installation
Instruction Manual
for model
FLOWMAX-120
Condensing water heater
116,000 BTU
WARNING
If the information in these instructions is not followed exactly, a fire or explosion may result, causing property damage, personal injury or death.
-Do not store or use gasoline or other flammable vapours and liquids in the vicinity of this or any other appliance.
-WHAT TO DO IF YOU SMELL GAS
●Do not try to light any appliance.
●Do not touch any electrical switch; do not use any phone in your building.
●Immediately call your gas supplier from a neighbour’s phone. Follow the gas supplier’s instructions.
●If you cannot reach your gas supplier, call the fire department.
-Installation and service must be performed by a qualified installer, service agency or the gas supplier.

Table of Contents

Questions and Answers

  • P
    Patrick HowardAug 16, 2025
    Why is there no flame in my FLOWMAX Technologies Water Heater?
    • C
      carolblackAug 16, 2025
      If there is no flame in your FLOWMAX Technologies Water Heater, it could be due to several reasons: there's no gas, so check the mains supply. The ignition electrode might be broken or grounded, the gas valve could be malfunctioning, or the ionization electrode is malfunctioning or the ionization electrode cable is disconnected, in which case replacement or connection of the part or wire is needed. The mechanical minimum adjustment on the gas valve or slow ignition adjustment might be set too low, requiring regulation. For propane water heaters, the gas valve inlet pressure might be too high, so check the maximum pressure setting. The power supply live and neutral wires could be inverted, requiring correct connection.
  • C
    Christopher WoodAug 19, 2025
    What to do if the safety thermostat tripped (203°F) / air pressure switch tripped in my FLOWMAX Technologies FLOWMAX-120?
    • L
      Leah SmithAug 19, 2025
      If the safety thermostat or air pressure switch tripped in your FLOWMAX Technologies Water Heater, the thermostat may be malfunctioning or out of calibration, the thermostat cable might be disconnected, or the switch is out of order, in which case replacement of the part is needed, or wiring should be checked. The inlet or outlet flue gas ducts may be obstructed, so check the flue gas ducts. The switch cable might not be stable, so check the cable.
  • S
    Sonya JohnsonAug 22, 2025
    What to do if there is a flame detection malfunction in my FLOWMAX Technologies FLOWMAX-120?
    • P
      Paul MedinaAug 22, 2025
      If you experience a flame detection malfunction in your FLOWMAX Technologies Water Heater, the ionization electrode or its cable might be malfunctioning, or the printed circuit board may be faulty. Try cleaning or replacing the ionization electrode, or replace the cable or the printed circuit board.
  • M
    Michelle RoseAug 26, 2025
    What to do if the flue safety thermostat tripped in my FLOWMAX Technologies FLOWMAX-120?
    • A
      Allison BairdAug 26, 2025
      If the flue safety thermostat tripped in your FLOWMAX Technologies Water Heater, the thermostat might be broken, the thermostat cable is disconnected, or the thermostat locked out due to high flue temperature. Replacement of the part is needed, or the electrical connection should be checked. Try restarting and checking the thermostat.
  • M
    Michaela LutzAug 28, 2025
    What to do if there is no water in the FLOWMAX Technologies FLOWMAX-120 system?
    • R
      Roberto RomeroAug 28, 2025
      If there is no water in your FLOWMAX Technologies Water Heater system, it may be due to insufficient water pressure (stopping at 0.3 bar), a disconnected water pressure switch cable, or a malfunctioning water pressure switch. Try filling the system or checking the wiring, or replacing the part.
  • A
    Alexandra SandersAug 31, 2025
    What to do if the heating sensor is not working in my FLOWMAX Technologies FLOWMAX-120 Water Heater?
    • J
      Jennifer FranklinAug 31, 2025
      If the heating sensor is not working in your FLOWMAX Technologies Water Heater, the sensor may be malfunctioning or out of calibration (resistance value 10 kOhms at 25 °C), or the sensor cable could be disconnected or wet. Replacement of the part is needed, or the electrical connection should be checked.
  • A
    angela60Sep 3, 2025
    What to do if the D.H.W storage cylinder sensor is not working in my FLOWMAX Technologies FLOWMAX-120?
    • D
      Dana JenningsSep 3, 2025
      If the D.H.W storage cylinder sensor is not working in your FLOWMAX Technologies Water Heater, the sensor may be malfunctioning or incorrect (resistance value 10 kOhms at 25 °C), or the sensor cable could be disconnected or wet. Replacement of the part is needed, or the electrical connection should be checked.
  • J
    Jacob PachecoSep 6, 2025
    What to do if my FLOWMAX Technologies Water Heater fan is not working?
    • X
      Xavier OneillSep 6, 2025
      If the fan in your FLOWMAX Technologies Water Heater is not working, it might be burnt out. Replacement of the part is needed.
  • J
    James MooreSep 9, 2025
    What to do if the fan printed circuit board is not working in my FLOWMAX Technologies FLOWMAX-120 Water Heater?
    • C
      Charlotte SpencerSep 9, 2025
      If the fan printed circuit board in your FLOWMAX Technologies Water Heater is not working, it might be malfunctioning. Replacement of the part is needed.
  • A
    adrianmcmahonSep 12, 2025
    How to fix a parameter programming request issue in FLOWMAX Technologies FLOWMAX-120?
    • M
      Matthew HamiltonSep 12, 2025
      If your FLOWMAX Technologies Water Heater is showing a parameter programming request, it could be due to a loss of microprocessor memory. Reprogram the parameters to resolve this issue.

Summary

General Safety Warnings

1. GENERAL INFORMATION

1.1 General warnings - Installation

Safety warnings for installation and operation of the water heater.

OPERATING INSTRUCTIONS

Operating Instructions

Step-by-step guide for operating the water heater.

TO TURN OFF GAS TO THE APPLIANCE

2. TECHNICAL CHARACTERISTICS

2.1 Technical data

2.2 Dimensions

Physical dimensions and clearance requirements for installation.

2.4 Water circuit

2.7 Control panel

3. INSTALLATION (authorized personnel)

3.3 Installing the water heater

Procedures and clearances for mounting the water heater on a wall.

3.4 Water connections

3.5 Domestic hot water circuit; Condensate Drain

3.6 Schematic of Piping Installation

3.7 Gas Connection

Guidelines and procedures for connecting the gas supply.

3.8 Electrical connections

Instructions for proper electrical wiring and grounding.

3.9 Venting

Guidelines for proper venting of exhaust gases to prevent CO hazards.

4. COMMISSIONING THE APPLIANCE (authorized personnel)

4.1 General warnings

General warnings for qualified personnel during commissioning.

4.2 Filling the system

4.5 Starting up the water heater

Step-by-step guide for initial start-up and burner ignition.

5. REGULATING THE APPLIANCE (authorized personnel)

5.1 Parameters table

5.2 Setting the parameters

6. MAINTENANCE (authorized personnel)

6.1 General Warnings

6.2 Maintenance

Gas valve

6.8 Wiring diagrams

6.10 Troubleshooting

6.11 Diagnostics

Error codes:

List of error codes displayed by the appliance.

FLOWMAX Technologies FLOWMAX-120 Specifications

General IconGeneral
BrandFLOWMAX Technologies
ModelFLOWMAX-120
CategoryWater Heater
LanguageEnglish

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