Munchkin MUNCHKIN HIGH EFFICIENCY HEATER with the "925" Controller manual Electrical

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ELECTRICAL

CAUTION

Electrical wiring on the Incoming Power and Central Heating Circulator shall be connected directly to the intended connection source and not be connected together inside the electric box provided. An Electrical Short will result and the Control board will have to be replaced! If Electrical Requirements of the Central Heating Circulator exceeds 4 amps (or 3 amps on HA models only) please follow the wiring diagrams on Figures 2-1, 2-2 and 2-3 (this section).

The electrical requirements are for standard 120 volts, 60 Hz 15 Amp service. This unit is wired with #18 awg and fused for no more than 15 Amps.

DANGER

IT IS EXTREMELY IMPORTANT THAT THIS UNIT BE PROPERLY GROUNDED!

DANGER

IT IS VERY IMPORTANT THAT THE BUILDING GROUND IS INSPECTED BY A QUALIFIED ELECTRICIAN PRIOR TO MAKING THIS CONNECTION!

There are two ground points in the electrical compartment that must be connected to the building ground system. Connect the building ground to the green ground screw and the green ground wire inside electrical box provided.

The Incoming Power Supply is connected to the Black (Hot) and the White (Neutral).The Munchkin Control board is polarity sensitive. If the polarity is reversed, the Munchkin control will not sense a flame and lock out the system. The Orange and Brown wire are provided to the supply of 120 volts to the Central Heating Circulator. Connect the Orange (Hot) and the Brown (Neutral) directly to the Central Heating Circulator.

DANGER

The Orange wire for the Central Heating Circulator is Switched Hot and must have a wire nut if not connected to the Central Heating Circulator. Failure to follow this instruction will result in a short, and the Control Board will have to be replaced.

Connect the gray wires to your heating thermostat (TT) connection. Your thermostat heat anticipator setting is .056 amp.

CAUTION

Do not power zone valves directly from the heater transformer. Doing so will greatly reduce the life of the transformer. Use a separate transformer sized to handle the total electric load of all zone valves.

It is important that the electrical power is not turned on at this time. Double check all connections and then turn the power on. The display that is provided with the Munchkin should now be reading the outlet temperature. Note: see Part 6/Startup Procedure section in the manual to change the temperature setting or run the heater.

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Contents Munchkin High Efficiency Heater With the 925 ControllerUsing this Manual Special Attention BoxesTable of Contents Part 1. General Information Munchkin Ratings and DimensionsHOW IT Operates Recommended Service Clearances Dimensions 80M 140M/199M PRE-INSTALLATION Requirement GeneralPressure Relief Valve Part 2. ElectricalElectrical Connection Electrical Connection Wiring Directly to Central Heating Circulator GAS Piping Part 3. GAS ConnectionGAS Connection GAS TableDungs GAS Valve Part 4. Venting Approved Venting MaterialsVenting the Munchkin Direct vent terminal clearance Minimum clearance, C Longer Vent Runs Vented ApplianceHeater Removal from a Common Vent System Condensate RemovalDiagrams for Sidewall Venting Venting Diagrams for Vertical Venting Part 5. Piping Hydronic Piping with Circulators or Zone ValvesCirculator Sizing Munchkin T50M Munchkin T80M/80M Munchkin 140M Munchkin 199MFill and Purge Heating System Piping Symbol Legend Piping IllustrationsOFF 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 Lighting Instructions Operating InstructionsAdjusting the Temperature on the Munchkin Display Status MenuTest Mode To Turn OFF GAS to AppliancePart 7. Troubleshooting Munchkin Error Code925 Control Board Error Codes Resistance Tables Condensate Cleaning Instructions Part 8. MaintenanceMaintenance Procedures Before Each Heating SeasonMaintenance Control Wiring Layout Munchkin ControllerMaintenance 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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