Munchkin MUNCHKIN HIGH EFFICIENCY HEATER with the "925" Controller manual Test Mode

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START-UP PROCEDURES / SERVICING

G. TEST MODE

This function is intended to simplify the gas valve adjustment if needed. Listed below are the recommended limits on each Munchkin Heater and the Combustion Settings. Automatic modulation does not take place when the controller is in Test mode, only temperature limitation based on the Munchkin Central Heating set point. The user will be allowed to increase or decrease the fan speed by pressing in either the S1/- or S2/+ keys.

To activate the Test mode simply press the S2/+ and S3/Program key together for 1 second. Once activated, you will see in the display Ser and the actual fan speed. The measurement of the combustion levels should always be taken at the highest and lowest fan speed. After 10 minutes, the Test mode stops automatically. To exit Test Mode press S1/- and S2/+ key together for 1 second.

COMBUSTION SETTINGS

HIGH FIRING RATES and LOW FIRING RATES ON ALL MODELS

 

Natural Gas

Propane LP

 

low

high

low

high

Carbon CO ppm Monoxide

0–20 ppm

70 ppm–135 ppm

0–20 ppm

80–150 ppm

 

 

 

 

 

Carbon CO2% Monoxide

8-1/2% – 9-1/2%

8-1/2% – 9-1/2%

9-1/2% – 10-1/2%

9-1/2% – 10-1/2%

Fig. 6-1

H. TO TURN OFF GAS TO APPLIANCE

1.Set the thermostat to lowest setting.

2.Turn off all electric power to the appliance if service is to be performed.

3.Remove the front cover.

4.Turn gas shutoff valve to "off".

5.Install front cover.

DANGER

Water temperature over 125 degrees F. can cause severe burns

instantly, or death from scalds. Children, disabled, and elderly

are at highest risk of being scalded. See instruction manual before setting temperature at water heater. Feel water before bathing or showering! Temperature limiting valves are available.

Fig. 6-2

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Contents With the 925 Controller Munchkin High Efficiency HeaterSpecial Attention Boxes Using this ManualTable of Contents Part 1. General Information Munchkin Ratings and DimensionsHOW IT Operates Recommended Service Clearances Dimensions 80M 140M/199M General PRE-INSTALLATION RequirementPressure Relief Valve Part 2. ElectricalElectrical Connection Electrical Connection Wiring Directly to Central Heating Circulator GAS Connection Part 3. GAS ConnectionGAS Piping GAS TableDungs GAS Valve Approved Venting Materials Part 4. VentingVenting the Munchkin Direct vent terminal clearance Minimum clearance, C Vented Appliance Longer Vent RunsCondensate Removal Heater Removal from a Common Vent SystemDiagrams for Sidewall Venting Venting Diagrams for Vertical Venting Hydronic Piping with Circulators or Zone Valves Part 5. PipingMunchkin T50M Munchkin T80M/80M Munchkin 140M Munchkin 199M Circulator SizingFill and Purge Heating System Piping Illustrations Piping Symbol LegendOFF Zone valves Piping Zone valves Make-up water Piping Space heating zone circuit Zone Circulators Make-up water PB1 PB2 PB1 PB2 Sequence of Operation Part 6. START-UP ProceduresItems to be Checked Before Lighting the Munchkin Operating Instructions Lighting InstructionsStatus Menu Adjusting the Temperature on the Munchkin DisplayTo Turn OFF GAS to Appliance Test ModeMunchkin Error Code Part 7. Troubleshooting925 Control Board Error Codes Resistance Tables Maintenance Procedures Part 8. MaintenanceCondensate Cleaning Instructions Before Each Heating SeasonMaintenance Munchkin Controller Control Wiring LayoutMaintenance Maintenance Page Page Munchkin R1

MUNCHKIN HIGH EFFICIENCY HEATER with the "925" Controller specifications

The Munchkin High Efficiency Heater, equipped with the advanced "925" Controller, represents a significant advancement in heating technology for both residential and commercial applications. Known for its reliability and exceptional performance, this heater is designed to provide efficient heating while minimizing energy costs and environmental impact.

The Munchkin High Efficiency Heater operates on a condensing technology that extracts heat from exhaust gases. This process allows for higher efficiency rates, often exceeding 95%. By recovering heat that would otherwise be lost, the heater maximizes energy utilization, making it an eco-friendly choice for homeowners and businesses alike.

One of the standout features of the Munchkin 925 Controller is its user-friendly interface, which allows for effortless operation and monitoring of the heating system. The controller comes with advanced diagnostic capabilities that provide real-time feedback on system performance. Users can easily adjust settings, program schedules, and monitor energy consumption, ensuring optimal comfort and efficiency.

Furthermore, the Munchkin High Efficiency Heater is equipped with a variety of features that enhance its performance and user experience. The unit is designed with a durable heat exchanger made from stainless steel, which not only improves heat transfer but also ensures longevity and resistance to corrosion.

The heater operates quietly, making it suitable for installation in residential settings, including bedrooms and living spaces. Additionally, its compact design allows for flexible installation options, even in constrained spaces. The Munchkin unit is also compatible with multiple venting options, providing further versatility in installation configuration.

Safety features are a priority in the design of the Munchkin Heater. It includes built-in freeze protection, ensuring that the system operates effectively even in low temperatures. The unit also has an array of safety sensors that monitor for conditions such as flue blockage and overheating, triggering automatic shut-off mechanisms to prevent potential hazards.

In conclusion, the Munchkin High Efficiency Heater with the "925" Controller is a cutting-edge solution for efficient heating. With its superior performance, advanced controller system, durable construction, and comprehensive safety features, it remains a top choice for those looking to improve their heating efficiency while reducing energy consumption. Whether it's for residential or commercial use, the Munchkin heater promises reliability and comfort in any environment.
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