Gasmaster GMI 2M - User Manual

Questions and Answers

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Jesse GomezAug 1, 2025
How to troubleshoot a Gasmaster GMI 2M when the blower does not start?
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  Vernon RobertsonAug 1, 2025
  If the blower on your Gasmaster Boiler doesn't start, first ensure the power switch is turned on. If it is on, check both fuses on the power and supply sides. If that doesn't resolve the issue, ensure that the Building Management System (BMS), if connected, is calling for heat. Also, verify that the high temperature limit switch and the maximum operating temperature switch are closed, and that the low gas pressure switch is closed. For further troubleshooting, consult page 20 of the Riello catalogue for burner controller troubleshooting.
K
Katie LutzAug 9, 2025
What to do if my Gasmaster GMI 2M Boiler unit does not start?
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  Michael BrownAug 9, 2025
  If your Gasmaster Boiler unit doesn't start, the issue could be due to several reasons. First, check if the blower is running. If not, refer to the troubleshooting steps for the blower. Another potential cause is an open air pressure switch on the housing, which can be resolved by adjusting the switch. Also, verify the gas pressure switch; if it's open, consider replacing it if defective. Similarly, if there's no ignition, try adjusting the switch. For further troubleshooting, consult page 20 of the Riello catalogue for burner trouble controller troubleshooting.
A
Ashley RiveraAug 23, 2025
What causes main flame failure in a Gasmaster GMI 2M?
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  Jessica BarkerAug 23, 2025
  If the main flame fails in your Gasmaster Boiler, check the electrical connections to the main gas valve to ensure they are securely connected. If the connections are good, inspect the two safety shut-off valves and replace them if they are defective.
M
Matthew StephensNov 15, 2025
Why is the pilot flame failing on my Gasmaster Boiler?
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  Paula SotoNov 15, 2025
  If you're experiencing pilot flame failure in your Gasmaster Boiler, start by checking the electrical connections to the pilot gas valve to ensure they are securely connected, referring to the schematic wiring diagram for terminal locations. If the connections are secure and there's still no ignition, inspect the two safety shut-off valves and replace them if they are defective. Also, inspect the flame rod to ensure it is clean and free of any sedimentation; clean it if necessary. Check the flame rod for cracks or defects and replace it if needed. Finally, measure the gas pressure in the pilot line at the exit test port of the second safety valve to ensure it's within the specified 2'-5' wc. If the pressure is not within range, check both safety shut-off valves and the pressure regulator, ...

Summary

Introduction to Gasmaster Boilers

Boiler and Water Heater Description

Detailed description of the Gasmaster GMI 2M (2ML) boiler and water heater's construction and heat exchange mechanism.

Control System Operation

Explains the boiler's control module, temperature sensing, and servomotor operation for regulating gas and air mixture.

Essential Safety Features

Lists and describes key safety features including low water cut-off, flame sensor, high temperature limit, air pressure, and relief valve.

Gas Line System Overview

Introduces the gas lines section, detailing pilot and main gas line configurations and safety measures.

Gas Manifold and Control Assembly Testing

Information on factory testing of gas manifold and control assembly according to ANSI standards.

Installation Code Compliance

Outlines installation requirements for Canada and the USA, including electrical and plumbing codes.

Freeze Protection Measures

Instructions on isolating and draining the boiler for freeze protection or using antifreeze for short-term storage.

Water Treatment Recommendations

Discusses the stainless steel construction, self-cleaning properties, and recommendations for soft water use.

Installation Guide

Boiler;Water Heater Package Contents

Lists the components included with each unit, such as burner, manifolds, safety switches, and gauges.

Site and Component Installation

Provides guidelines for boiler location, placement, clearances, and installation of the pressure relief valve.

System Connections (Water, Gas, Condensate)

Details water, condensate, and gas line connections, including required codes, pressure settings, and installation methods.

Vent Connection Requirements

Instructions for connecting the vent, compliance with codes, and notes on equivalent lengths and exhaust venting.

General Installation Instructions

General instructions regarding pressure testing, protecting ignition components, leak testing, grounding, and location considerations.

Operation and Commissioning

Sequence of Operation Overview

Details the sequence of operation, including safety loop components and events like pre-purge and pilot flame.

Pre-Commissioning Procedures

Covers pre-commissioning tasks for water, gas, vent, condensate connections, and power supply.

Commissioning Procedures and Test Points

Outlines the commissioning process, including purging, power connection, and critical test points for gas and air pressures.

General Operation Safety Instructions

Provides safety instructions for overheating, gas supply failure, and units submerged in water.

Maintenance and Troubleshooting

Annual Service Recommendations

Provides annual service hints including ensuring clear ducts, clean environment, proper wiring, and checking key components.

Troubleshooting Common Issues

Lists common faults like blower failure, no start, pilot/main flame issues, and provides causes and corrective actions.

Gasmaster GMI 2M Specifications

General

Gas Type	Natural Gas, LPG
Gas Detection Range	0-100% LEL
Operating Temperature	-20°C to +50°C
Power Supply	24 VDC
Output Signal	4-20 mA