Transcript
INSTALLATION AND TECHNICAL eliminated. Oxygen and minerals in the water coming in to replace the water leaking out will damage the MZ.
CORROSION: The MZ should be filled with clean, clear, neutral ph water suitable for drinking. A cleaning solution such as a mixture of water and trisodium phosphate should be used in any systems with oily residues. Many chemicals have been used over the years in existing heating systems that could cause premature failure of MZ units. It is important that no additives be used in the system water for the MZ other than BIONIBAL, which is supplied with each unit. IMPORTANT: The use of a 2% by volume solution of BIONIBAL in a radiant-heating system using non-oxygenbarrier tubing will protect the MZ and the system to which it is connected, from oxygen corrosion. In a system using tubing with an effective, intact, oxygen barrier or in a hard-piped system, a 1% solution of BIONIBAL is sufficient. BIONIBAL doesn’t deteriorate or weaken over time, but should be renewed if system is drained.
in an easily accessible place. The pipe supplying gas to the heating system must not cause a pressure loss great enough to decrease inlet gas pressure below the specified minimum gas pressure values. (5" of water column for natural gas, 11" for LP.) After initial start up, check that the pressure tapping points are properly closed and check the general leak tightness of the gas circuit. Always purge through the gas pipe work before initial firing of the unit (in order to get rid of any particles produced by welding or threaded joints). The unit and its individual shut-off valve must be disconnected from the gas supply piping system during any pressure testing of that system. EXAMPLE PIPE SIZING TABLE For gas flow through various pipe lengths and diameters. (FOR REFERENCE ONLY) Capacity of pipe for pipe size (ft3/hr) Pipe length (feet) 1/2" 3/4" 1" 1 1/4" 10 132 278 520 1050 20 92 190 350 730 30 73 152 285 590 40 63 130 245 500 50 56 115 215 440 75 45 93 175 360 100 38 79 150 305 150 31 64 120 250
Under no circumstances should standard commercial antifreeze solutions be used in the MZ. Most of them contain corrosion inhibitors that are not approved for use in the MZ. They will cause heat exchanger failures that are not covered by warranty. No other additives for lubrication, leak stoppage or any other purpose can be used in the MZ. To do so will void all warranty.
FREEZE PROTECTION:
Note: Table above is for natural gas with specific gravity 0.60 with a pressure drop through the gas piping of 0.30" w.c. Refer to ANSI Z223.1 for additional pipe sizing.
In situations where freeze protection is a necessity. MPI ships 5 gallon quantities of BIONIBAGEL anti-freeze which is formulated with Bionibal at a concentration that will bring a 50/50 mix of BIONIBAL and water to a 1% concentration of BIONIBAGEL. If the application does not require a 50/50 mix, the addition of sufficient BIONIBAL to bring the resulting solution to a 1% concentration is important, otherwise bacterial growth and corrosion may take place. In non-barrier systems, which we discourage, a 2% concentration of BIONIBAL must be assured. One quart (part # 9526) and 2.6 gallon (part #9519) quantities of BIONIBAL are available from MPI.
NATURAL GAS TO LP GAS CONVERSION AND HIGH ALTITUDE ADJUSTMENT:
Note that the addition of glycols to the water passing through the MZ changes the rate at which the mix absorbs and releases heat, decreasing its effectiveness as a heat transfer fluid. Glycols also increase the viscosity of the water, making it more difficult to pump. These factors can significantly influence the overall performance of the heating system and should be taken into account in the system’s design.
2. Reconnect nut and tighten. 3. For MZ25C/S models only: Remove the combustion air fan by pulling it to the right. Disconnect the rubber air hose and the wiring. Set the fan aside. Note: The split-ring LP orifice slips into the burner, as shown below. If it fits loosely, use the appropriate tool to open the split-ring LP orifice so that it holds in place. 4. Inlet gas pressure for LP gas must be between 11" and 13" water column with the heating system running. The MZ40C requires no gas valve change. The MZ25C/S requires a gas pressure adjustment from the factory 2.8" water column setting to 5.5". The adjuster is under the slotted cap on the gas valve. Turn the adjustment screw underneath the cap full clockwise and then back off one turn counter-clockwise. Replace cap. The heating system should then fire, permitting outlet pressure measurement. Repeat adjustments until the correct outlet pressure of 5.5" is reached. The final pressure reading at tap P2 must be taken with the unit running and the cap reinstalled on the gas valve.
NOTE: Many commonly used, unapproved corrosion inhibitors CAN DAMAGE THE MZ AND VOID THE WARRANTY.
MZ Heating System
GAS PIPING: The supply line is 3/4" NPT, and enters at the lower left side of the unit as shown. The gas supply pipe must be fitted with a 1/ 4 turn stop valve located MZ INSTALLATION & MAINTENANCE
ÍGas Inlet
Each MZ is supplied with a LP conversion kit. Follow steps for conversion from Natural gas to LP:
1. Loosen the nut from the gas line/burner junction as shown on next page (there are 2 on the MZ40C). Insert orifice into gas line. Note that since there is no natural gas orifice in the MZ40C, the tightening of the union between the gas line and the elbow sometimes narrows the opening in the gas line for the orifice. If that occurs, ream the opening. For MZ40C LP heating systems, insert orifices before mounting heating system.
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