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

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MAINTENANCE

DANGER

IT IS EXTREMELY IMPORTANT TO MAKE SURE THE EXHAUST VENT IS NO LONGER BLOCKED. FAILURE TO DO SO MAY RESULT IN PERSONAL INJURY OR DEATH.

D. COMBUSTION CHAMBER COIL CLEANING INSTRUCTIONS*

*Before beginning this procedure, you must have on hand the following items:

–a nylon, stainless or brass brush (not steel)

–“Rydlyme” (recommended for best results) (available on line www.rydlyme.com) or “CLR” (available at most hardware stores)

1.Shut down the Munchkin by using the following steps:

a.Close the gas valve, shut down the unit and wait for the unit to be cool to the touch

b.Disconnect the condensate hose from the outside connection, (not from the Munchkin side), so the flow can be observed.

c.Remove the (4) screws on the aluminum ½” NPT connector on the gas valve.

d.Disconnect the poly hose connected to the combustion blower motor. (This does not apply to T50/T80.)

e.Remove the (6) 10MM nuts from the burner plate assembly to access the coils.

f.Pull the entire burner plate assembly towards you, while removing or pushing aside any wiring to allow the removal of the assembly.

2.Using a spray bottle filled with the recommeded product “RYDLYME” or “CLR”, spray liberally on the coils, making sure the solution penetrates and funnels down through the condensate hose. If the con- densate hose is blocked, let the chemical penetrate for at least 15 minutes or until it drains.

3.Use the nylon, stainless or brass brush (do not use steel) and scrub coils to remove any buildup, then vacuum the debris from the coils.

4.Spray the coils with clear water, making sure to confine the spray to the area being cleaned (Try to avoid getting the back ceramic wall of the unit wet). Flush the combustion chamber with fresh water. At this point, the Munchkin should be ready to power back up.

Before powering up the Munchkin follow the steps below

a.Re-install the burner assembly

b.Replace the (6) 10MM nuts to the burner plate

c.Re-connect the wiring

d.Re-connect the poly hose to the combustion blower motor. (Does not apply to the T50 or T80.)

e.Replace the (4) screws on the aluminum ½” NPT connector on the gas valve. Turn the gas back on. (IMPORTANT: CHECK FOR GAS LEAKS)

f.Re-set thermostats (IMPORTANT: MAKE SURE EXHAUST VENT IS NO LONGER BLOCKED!)

g.Turn the Munchkin back on** and observe condensate flow.

h.Re-connect the condensate hose to the outside connection.

DANGER

IT IS EXTREMELY IMPORTANT THAT YOU CHECK FOR LEAKS WHEN RECONNECTING THE GAS VALVE AND MAKING SURE THE EXHAUST VENT IS NO LONGER BLOCKED. FAILURE TO DO SO MAY RESULT IN SEVERE PERSONAL INJURY OR DEATH.

**NOTE: When firing up the boiler for the first few times you may experience some flut- tering of the gas burner that may result in a flame lockout. This is normal and will require you to re-cycle the unit until this clears up. This is caused by water still present in the combustion chamber.

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Contents Munchkin High Efficiency Heater With the 925 ControllerUsing this Manual Special Attention BoxesTable of Contents Munchkin Ratings and Dimensions Part 1. General InformationHOW IT Operates Recommended Service Clearances Dimensions 80M 140M/199M PRE-INSTALLATION Requirement GeneralPart 2. Electrical Pressure Relief ValveElectrical 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 Part 6. START-UP Procedures Sequence of OperationItems 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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