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Monitor Hydronic Boilers FAQ Page
Commonly asked questions about the MZ Boiler Return to Monitor Boiler Main Page |
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Please select the topic below or just page through this page to see all the topics.
Information referred to on this FAQ page can be found in more detail on specific
product pages. If you need anymore information - please hit the "contact us" button on the top of this page and ask our experts.
What are MZs and how are they used? What do I need to know about the MZ in order to design it into a job? What is the electrical connections system? What do I have to worry about with the MZ? What maintenance is Required? How often does the MZ fail? How easy is the MZ to fix? |
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MZ is the trade name for an ultra high efficiency, fully condensing hydronic heat
source. There are three models, the 25S, 25C and 40C. All MZs add tremendous value to
low-temperature systems such as radiant-panel and cast-iron radiators by delivering
fuel-use reductions that average 50% for small, low-temp systems while at the same
time simplifying design, installation and sizing. They are especially attractive to
customers who want to save fuel (savings of at least 30%, compared to conventional,
cast-iron boilers). They are silent, wall-hung, sealed-combustion, direct-vent with
concentric horizontal or vertical flue, and very compact. Entirely self-contained
with all of the specialty items needed for operation built-in, they are unusually
easy to place in structures where finding room for conventional heating equipment
is difficult. MZs are exactly what customers who want the ultimate in quality,
efficiency and environmental cleanliness are looking for.
The MZ25S supplies hydronic space heat (up to 90,000 BTU/hr, depending on return-water temperature) and sufficient domestic-hot-water to meet the needs of a home with no more than a 3gpm hot water drain (one shower at a time). Because the 25S does both space heat and DHW from a silent, wall-hung, 30" tall, 30" wide, 13" deep, sealed- combustion package, it is ideal for condo, apartment and electric-to-gas conversion work. The MZ25C is a 94,000 BTU/hr input unit in a 30" tall, 22" wide, 13" deep package. The MZ40C is a two-stage (72,500 and 142,000 BTU/hr input) unit in a 30" tall, 30" wide, 13" deep package. Because the 40C is used on larger systems, its built-in pump will usually have to be supplemented by external zone pumps. The 40C will also have to have an external expansion tank plumbed into the system to which it is connected. Both the MZ25C and MZ40C can be used to make large amounts of DHW very economically through the use of appropriately sized indirect storage tanks. Since the MZ is the most self-contained heat source that we know of, its installation is exceptionally easy. Installation location, venting, fuel type, freeze protection and the MZ's interface with the rest of the heating system are the main considerations. LOCATION The MZ is designed for wall mounting on properly constructed standard walls. Since the MZ is ordinarily delivered with a 39" horizontal vent kit, it installs least expensively on, or near, an outside wall, though it can be vented vertically or even retrofitted into locations requiring extended vent runs. The MZ is finished with a kitchen-grade exterior. It makes no more noise than the typical new refrigerator. When vented with its concentric-vent materials, it uses no room air for combustion. VENTING The MZ can be vented horizontally or vertically. We recommend concentric venting because it is more energy efficient and adds an extra layer of safety. If concentric venting is impractical, the MZ can be vented through parallel runs of schedule 40 PVC with a 10' load of CPVC. On vent runs longer than thirteen feet, the MZ's output will be diminished at a rate of approximately one percent per twenty feet of equivalent extension. When a concentric vent is used, a slight increase in efficiency is seen. Whenever an extended vent is used, the MZ's gas-air mixture will have to be set for clean combustion. Combustion air for the MZ must not be drawn from a contaminated source. FUEL TYPE The MZ is fired at the factory with natural gas orifices. LP orifices are shipped with each unit. The conversion procedure is quick and easy but must be checked for proper gas-air mixture with a CO or CO2 test kit. FREEZE PROTECTION The MZ should not ordinarily need freeze protection, but if it does, it is very important that only uninhibited glycol be used in the MZ. WARNING: THE CORROSION INHIBITORS USED IN COMMONLY- AVAILABLE GLYCOLS Wl.LJ: DAMAGE THE MZ DURING NORMAL OPERATION AND WILL VOID THE MZ'S WARRANTY IF USED. We ship a specially-formulated, fully-approved potable oxygen inhibitor with the MZ that permits the MZ to be used with non-barrier radiant tubing. If freeze protection is required, use only uninhibited glycol and add the appropriate amount of the corrosion inhibitor (INABAL) that ships in the carton with the MZ to the system. Since the MZ is the most self-contained heat source that we know of, its installation is exceptionally easy. Installation location, venting, fuel type, freeze protection and the MZ's interface with the rest of the heating system are the main considerations. SYSTEM CONNECTIONS ELECTRICAL The MZ uses standard 120V, 60 cycle, three-wire (load, neutral, and ground) current and draws about 100 watts in full operation, The MZ can be controlled by a standard wall stat, aquastat, indoor-outdoor relay or any other appropriate external control. Two-stage operation of the MZ40C is automatic. On a call for heat, both burners fire. When return-water temperature gets to within nine to fourteen degrees F pre set temp, the 2nd stage shuts off and the 1st stage runs until the heat call is satisfied or the load increases and the second stage comes back on. PIPING AND PUMPING The MZ25 is a complete heating system. The MZ40 does not have room in its cabinet for an expansion tank, so an expansion tank will have to be added outside the MZ. All MZ units have built-in Grundfos 1542 pumps. The MZ25's pump will be sufficient for most of the jobs for which the MZ will be used, but not for all. It is important to do a careful design of the piping system to which the MZ25 is to be connected if its pump is going to be relied on for the entire system. For some MZ25 applications and most MZ40 jobs, primary-secondary pumping will be required. Nothing Since the MZ is the most self-contained heat source that we know of, its installation is exceptionally easy. Installation location, venting, fuel type, freeze protection and the MZ's interface with the rest of the heating system are the main considerations. Follow the clear installation instructions carefully. Use good common sense, pipe a clean system, fill it with clean water, provide good combustion air and fire the MZ with standard natural or LP gas. Don't worry. We've done a superb job with everything else. The MZ has electrical and mechanical parts, just the same as other heating equipment. You can expect the rate of failure of those parts on the MZ to be exceedingly low for three reasons. First Quality is never compromised in the manufacture of the MZ. The very best components and manufacturing processes are used. You will recognize such industry-standard parts as the Honeywell positive-pressure gas valve, transformer and ignition module used on the MZ. You know how seldom they give trouble. All of the parts used on the MZ are of equal or better quality. Second The MZ's design is extremely conservative. It puts minimal stress on the MZ's parts in normal operation and leads to a very long parts-Iife expectancy. The MZ's design and construction is rugged, tolerant and flexible. Third The MZ is an ISO 9002 certified product. The ISO 9002 process uses external auditors to certify that quality control and quality improvement programs are in place to assure that every unit that leaves the factory has been manufactured to the highest standards. Any variance from those standards will be analyzed and responded to in a way that will prevent its recurrence. The ISO process drives continual quality improvement, which means that over time, the MZ, which already has a near-zero failure rate, will get more and more reliable. If you install the MZ correctly, you won't have to worry about it. It will give your and/or your customers years and years of reliable service. Because MZs are completely self-contained units that need only to be connected to properly designed return- and-supply water piping, a proper gas supply, a proper electrical supply and proper venting, they are the easiest units to install that we have ever seen. An annual clean and check of the MZ is recommended but not required. The procedure is not at all complicated, takes an average of fifteen minutes, uses no exotic tools, and eliminates all preventable no-heat calls in the following heating season. MZs that have not had the recommended service will begin to experience intermittent no-heat calls after an average of five to seven years of normal use in a climate such as that experienced in the Midwest states of the USA. The spark igniter or flame rod, which are bathed in flame, will require adjustment or replacement in time because flame, like running water, wears things away. No other operating parts are exposed to the MZ's flame that way. Some of the ash from the dust that is brought into the MZ with its combustion air will cling to the stainless-steel heat exchanger in the MZ and cause intermittent flame failure in time. A regular 15-minute clean-and- check prevents these failures. If an annual clean-and-check is run on the MZ, the likelihood that the MZ will need other service is very, very, very low. The MZ is designed in the same fail-safe way that a fine boat or airplane is, and has a virtually unlimited life expectancy if it is given proper care. The MZ's design incorporates many small, but important details that ease service. The combustion-air blower is can be removed in less than ten seconds! The burner is easily removed in about three minutes. Component wiring within the MZ is typically by snap- together AMP connectors that quickly and positively secure wiring in the correct position, so that miss wiring is very unlikely. Pump change out takes less than ten minutes. The extremely rare heat-exchanger replacement takes less than two hours. There are no sweat-fittings on the MZ. All waterside connections within and to the MZ are made with unions or bolt-and-gasket assemblies. Access to critical fasteners in the is never a problem. Easily removable plastic plugs in the MZ's cabinet have been provided so that tasks that otherwise would take extra manual dexterity are quick and easy. All of the concentric-vent connections for the MZ are slip-fit, making assembly and future changes, if called for, extremely simple and straightforward. The MZ is exceptionally easy to install and service, although very little service is ever required. |
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