Monitor MZ, MZ25S, MZ25C, MZ40C Maintance Manual

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TABLE OF CONTENTS - INTRODUCTION

I. Introduction .................................. 2

MZ 25C

Important Information ...................... 2

The Monitor MZ .............................. 3

Technical Specifications ................. 4

Getting Started ............................... 5

Receiving, Opening, Storage........... 5

II. Installation & Technical ............... 5

Location .......................................... 5

Mounting ......................................... 6

Using MZS to Produce DHW .......... 6

Condensate .................................... 7

Charging & Leak Testing ................. 7

Corrosion ........................................ 8

Freeze Protection ........................... 8

Gas Piping ..................................... 8

Propane Conversion ........................ 8

Venting ......................................... 10

Electrical . .................................... 15

Start Up ........................................ 16

Flow Verification ........................... 16

III. Accessories ................................. 17

BS Indirect Water Tank................. 17

Domestic Hot Water Kit ............... 18

MZ Mod Control ............................ 18

IV. Maintenance................................ 19

V. Troubleshooting ......................... 19

VI. Appendix A ................................. 22

Piping schematics ........................ 22

Wiring schematics........................ 26

VII. Appendix B ................................. 29

Parts and Assembly drawings ...... 29

VIII.Warranty ..................................... 40

! FOR YOUR SAFETY !

This product must be installed and serviced by a professional service technician, qualified in hydronic heating system installation and maintenance. Improper installation and/or operation could create carbon monoxide gas in flue gases which could cause serious injury, property damage, or death. Improper installation and/or operation will void the warranty.

! WARNING !

If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life. Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.

! WHAT TO DO IF YOU SMELL GAS !

• Do not try to light any appliance.

• Do not touch any electrical switch; do not use any phone in your building.

• Immediately call your gas supplier from a nearby phone. Follow the gas supplier’s instructions.

• If you cannot reach your gas supplier, call the fire department.

Products that have earned the Energy Star® are designed to protect the environment through superior energy efficiency.

ISO 9001 registered. Approved by AGA, CGA, CSA, IAS, CE and several state and municipal approvals.

I. INTRODUCTION - IMPORTANT INFORMATION

The purpose of this manual is to provide a useful reference for contractors, distributors, engineers, architects, building owners, and those considering the use of this heating system.

1. There is no low temperature return limit. This means that NO SYSTEM / THERMAL SHOCK PROTECTION IS REQUIRED. The MZ is a fully condensing heating system. The colder the return water, the more condensing action, the more efficient.

2. The heat exchanger is stainless steel.

• You will not shock, warp, corrode, or otherwise harm it

with temperature or rapid temperature changes.

• No primary/secondary piping arrangements are needed

to protect the heating system from low-temp. operation.

• You can size the heating system to the heat loss of

the structure. This is important when the structure has been improved over the years but the original radiation remains, permitting lower operating temps at high efficiency and comfort levels.

3. An adjustable control knob on the unit, from 65º to 176º F, controls the outgoing water temperature limit for the main

heat. No other controls or mixing valves are needed for low temp applications. The MZ’s design simplifies multi-temp, multi-zone applications.

4. When using the MZ for domestic hot water (DHW) or other priority application, use our MZ DHW kit, part # 9523. It makes combining different temps for heat and DHW or other applications quick and easy. Our 25, 40, 50 and 80 gallon BS tanks are perfectly matched to MZs.

5. MZ heating systems are completely self-contained. Circulator pump, air eliminator, low water cut off, pressure relief valve, condensate trap and drain, return water strainer, temperature/pressure gauge, fill/ drain valve, on/off & summer/winter switch, manual flow bypass, and, except for the MZ40C, an expansion tank big enough for a 25 gallon system.

6. Three vent systems available:

1.) Parallel CPVC - separated exhaust & inlet air

2.) Horizontal concentric

3.) Vertical concentric

For most new and retro-residential jobs, there are no other

MZ INSTALLATION & MAINTENANCE

INTRODUCTION

components to buy in order to supply heat to the distribution system. The MZ is a “mechanical room on the wall.” Labor savings are dramatic.

If a system is designed with a run temperature of 180°-200°F, extra radiation may be needed since the MZ is not designed for such high temperatures.

7. The MZ is wall hung, zero clearance, and direct vent (uses no room air). It can be mounted almost anywhere; above the washer / dryer in the laundry room, in a pantry, bathroom, closet, kitchen - you name it. Because it has no footprint, it is extremely valuable in condos and apartments.

THE MONITOR MZ 25C

Combustion air intake via

concentric flue housing.

Flue gas

outlet.

Extremely

reliable spark

8. MZ Heating System facts:

• Longest successful history of reliability of all high efficiency, fully condensing heating systems.

• ISO 9001 certified.

• Perfect for radiant heating.

• EPA Energy-star listed.

• CSA Listed for Canada & US.

The rest of this manual should give you all the information needed to properly plan, install, maintain and service this state of the art, ultra high efficiency heating system.

Pre-mixing stainless steel burner.

ignitor

Flame inspection port (visible from cabinet door).

Air flow proving switch.

Honeywell® gas valve.

Heat exchanger exhaust outlet.

Convenient tapping for

flue gas measurement.

System water

temperature/pressure indicator.

Adjustable system

water temperature control.

Gas inlet pipe.

On/Off switch.

Summer/Winter switch.

Expansion-tank NOTE: Easyoff

expansion tank connection.

(Typical of quick piping

connections and extremely easy

parts access throughout.)

Grommets for electrical wiring.

Condensate trap.

Heating system supply

water outlet from below

(connection in back).

27-watt nearly silent air inlet combustion turbine.

Cast aluminum water jacket.

Stainless steel finned-tubed heat exchanger.

Rubber gasket for cabinet seal

Pressure relief valve.

Water proving flow switch.

Electrical interface panel for thermostat & household power.

Grundfos®1542 3-speed circulator pump.

Air Eliminator- NOTE: Air vent on top is fully serviceable without need to drain system.

Stainless steel fill & drain ball valve.

System return water inlet with stainless steel strainer to prevent clogging.

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INTRODUCTION

T E C H N I C A L S P E C I F I C A T I O N S

MODEL

MZ25C

MZ40C

MZ25S

BTU input

AFUE Efficiency

Built-in Controls & Functions

Dimensions

Weight

Vent Length

Fuel (see pg. 12)

QUICK REFERENCE INFORMATION

Heating value H 60°F / 5.5°C

BTU/foot3 CO/ CO2

Inlet Pressure (IWC)

Gas flow (cf per hour) @60°F

Air Reducer in /mm

Gas Orifice in /mm

P 2 (outlet pressure, IWC)

Air Pressure Switch Differential

Heat Input (BT_U / _HR)

94,500 (Shown Above)

92 to 97%

(depending on return water temp.)

Priority pumped hi-temp circuit (for DHW or heat)

30" H x 22" W x 13" D

125 lbs.

Vent runs longer than 13.5 feet derate input by 1% per 30 feet. Contact MPI if run is to exceed 30 feet.

Each MZ is factory tuned for natural gas, but propane kit is included. Conversion takes about 15 minutes.

MODEL

MZ 25

MZ 40

BOTH

MZ 25

MZ 40

MZ 25

MZ 40

MZ 25

MZ 40

MZ 25

MZ 40

MZ 25

MZ 40

MZ 25

MZ 40

MZ 25

MZ 40

71,000 / 142,000

92 to 97%

(depending on return water temp.)

Priority pumped hi-temp circuit (for DHW or heat)

30" H x 22" W x 13" D

160 lbs.

NATURAL GAS

1075

30ppm / 9.5%

7.0"

87.9

132

1.14" / 29mm

None

0.228" / 5.8mm

None

2.8"

1.57" IWC

.79" IWC

94,500

Two Stage 71,000 / 71,000 Each

94,500

92 to 97%

(depending on return water temp.)

Intergal DHW tank with seperate aquastat

30" H x 22" W x 13" D

160 lbs.

LP GAS

2500

50 ppm / 10.7%

11.0"/13"

37.8

56.8

1.22"/31mm

None

0.138"/3.5mm

0.165"/4.2mm

5.50"

2.8"

1.57" IWC

.79" IWC

94,500

Two Stage 71,000 / 71,000 Each

MZ 25S Domestic Hot Water Flow Rate

Delta 54 °F (30°C) @ 2.91 GAL/MIN

Minimum System Water Flow Rate

MZ 25C and M25S: 3.5 GAL/MIN MZ 40C 4.25 GAL/MN

Water Pressure

Heating pressure: maximum 43.5 PSI (3 bars) minimum 14.5 PSI (1 bar) Hot water pressure: maximum 87 PSI (6 bars)

Maximum Operating Flow Temperature

Nominal 180° F (80° C).

Electrical Supply

120V -60Hz -15AMP

MZ INSTALLATION & MAINTENANCE

Combustion Products

MZ 25 SERIES: Max temperature: 176° F (80° C). Flow rate 32° F (0° C) 14.7 PSI (1013 mbar): 1201 foot3/h - 34 m3 h.

MZ 40 SERIES: Max temperature: 176° F (80° C). Flow rate 32° F (0° C) 14.7 PSI (1013 mbar): 2084 foot3/h - 59 m3 h.

Water capacity of expansion tank on MZ25C/S

26 gallon system capacity

Water capacity of:

MZ25C 1.5 gallons MZ25S 6.50 gallons MZ40C 2.25 gallons

INTRODUCTION - INSTALLATION AND TECHNICAL

GETTING STATED

RECEIVING:

Before the contractor accepts the MZ, care should be taken to verify that it has suffered no shipping damage. MPI cannot cover shipping damage. Trucking companies refuse to cover hidden damage if the damage is not claimed immediately.

The MZ is externally protected by foam inserts, a plastic bag and cardboard corner braces. Between the foam protector for the top of the MZ and the carton is a steel mounting rail that is formed to match the mounting rail on the back of the MZ.

OPENING THE MZ:

The front cover of the MZ is sealed against the back with a rubber gasket. With the cover on, the interior of the MZ becomes a plenum. The cover is held at the top by a mounting lip from which it hangs. The bottom of the cover is fitted with two clips that snap closed around the bottom of the back. These clips are secured with two screws that hold the clips in place. Remove the screws so the cover can be removed. Replace them when the installation is complete.

STORAGE:

If the MZ will not be installed right away it should be inspected and then stored in a secure, dry location.

INSIDE THE COVER OF THE MZ ARE:

• Installation instructions

• LP conversion kit and instructions

• A container of BIONIBAL corrosion inhibitor

• A set of union elbows and gaskets for connecting the MZ water and gas piping

• Two (2) service drivers.

auto fill valve if one is required or as the appropriate place to connect additional expansion tank, if needed. If not needed, cap it. If you are going to use it, check to make sure that the opening in the male port has been drilled out.

All of the parts inside the MZ’s cover are important and should be carefully guarded during the time between unpacking the MZ and installing it. The gaskets that are part of the connection kit are easy to misplace. Please put them in a safe place until ready for installation.

Combusion air in

Products of combustion out

Concentric flue illustrated here. Pipe must be extended to outside of structure.

You will notice that one of the heating systems “J” pipes has an extra 3/4" male port on it. This can be used for the return of the Domestic Hot Water or high temperature circuit, as well as an

II. INSTALLATION AND TECHNICAL

CHOOSING A LOCATION:

When choosing a location to mount the MZ, run length of the venting may be the primary factor, since it has the most limiting factors and, in the case of the concentric type, it can be expensive.

The other factors are proximity to existing or proposed piping and gas lines, as well as a condensate drain. It is usually easier to run longer piping and gas lines than it is to have a far reaching and multi-elbowed vent system. The MZ should never be mounted outdoors open to the weather. A sheltered outdoor location is OK, but freeze protection of the condensate trap and drain and of the circulating fluid will be necessary in cold climate zones.

The mounting wall should be sound and dry. Wall anchors can be used for masonry; screws for wood and carriage bolt for metal frames. If the wall is stone or very uneven, a pair of 2x4s from the floor to the ceiling joists works fine. Be sure to leave clearance for the vent if vent is exiting straight out the rear.

Clean combustion air is necessary for proper operation of MZ units. Some dust will be brought into the MZ and will burn in the flame. Some of the ash produced will cling to the fins of

Combustion chamber

Condensate collection

the MZ’s heat exchanger or be carried into the condensate trap. Some airborne substances that can be encountered in the residential and light commercial applications that the MZ is commonly used in can cause premature failure of components vital to the MZ’s function. The MZ’s combustion air must be free of chlorine, fluorine, bromine, acids, cleaning compounds, solvents, metal dusts, metal fumes and air contaminated with the gasses produced in animal confinement buildings.

Take special care to avoid chlorine fumes such as from muriatic acid commonly used for concrete cleaning. Special care should be given to MZ installations that are near swimming pools, laundries, beauty parlors, dry cleaners, metal working operations, metal treating operations, industrial plants, automobile or diesel operations, and animal confinement facilities.

The MZ is very quiet and is rated for zero clearance to combustibles. It requires no special utility room or fireproofing for its location. It can be put in living spaces, pantries, bathrooms or closets. Since it is sealed combustion, it does not need any indoor air source of any kind though indoor air

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INSTALLATION AND TECHNICAL

for combustion is approved if National Fuel Gas Code requirements are followed. Utilizing indoor air can cause a decrease in the overall system efficiency. The MZ should not be run where ambient temperatures exceed 125° F.

MOUNTING THE MZ:

The MZ comes from the factory with a wall mount bracket, gas and water pipes. With this method you must: Mount the bracket securely, hang the MZ, attach the included turn-down elbows and begin piping. Note that when the caps that cover the nipples on the heating system are removed, it is normal to find water left over from the test-run firing at the factory. Watch out for black-water staining if you are working in a clean area. Always flush the heating system with plenty of clean water before commissioning.

There are times when the rough piping for the heating system must be installed and pressure tested before the heating system is actually needed. The pre-plumbed wall bracket was designed for this scenario.

Note that the pre-plumbed brackets come with and domestic cold water shut-off valves on the 25S.

The pre-plumbed bracket (part #9511 for MZ25C pictured at right, #9512 - MZ40C and #9513 for MZ25S) allows completion of the heating and domestic water piping without the heating system present. NOTE: All MZ heating systems are shipped with an offset “Z” bracket for flush mounting. The #9515 Spacer Back Plate for MZ25C & the #9516 Spacer Back Plate for MZ25S and MZ40C allow piping to be run up behind the unit.

Pre-plumbed brackets can be a big help with radiant systems on new construction or major remodel jobs. Fit the bracket, pipe the gas and heat, use standard pipe plugs with the supplied fiber gaskets to pressure test the entire system.

When the time comes for the heating system, simply remove the plugs, hang the MZ, tighten the union nuts that connect the MZ to the piping and fill the unit. Preplumbing spares you the worry (and cash flow) of having the heating system sit on the job site out of your control while construction goes on. Thirty minutes should be all you need from delivery to light off.

USING MZS TO PRODUCE DOMESTIC HOT WATER:

SIZING:

As long as the BTU output of the MZ is greater than the design heat loss of the structure, the DHW draw on the MZ does not have to be taken into account because DHW run times are very short. The only time that DHW loads affect sizing is when they are unusually large.

INDIRECT:

Because of its very high efficiency and very quick response time, the MZ series is especially well suited for high-volume DHW water production through the use of water storage tanks using the heat produced by the MZ. Our 25, 40, 50 and 80 gallon stainless tanks are designed with the contractor, the end-user and the MZ in mind.

In mixed space-heat DHW applications, the DHW function is given priority over space heat through the use of a three-way valve or priority pump system controlled to direct 100% of the MZ’s output to the heat exchanger in the DHW system.

DIRECT DOMESTIC HOT WATER, THE MZ 25S:

The MZ 25S provides space-heat and DHW at extremely high levels of efficiency and low levels of pollution. It is especially well suited for structures in which floor space is at a premium. The MZ 25S will produce 2.9 GPM of domestic-hot-water at

a 54º F temperature rise. That is a constant draw of 174 gallons per hour. That setting maximizes efficiency and DHW production, and works fine for a one-shower application.

The tank on the right side of the MZ25S inside its cover holds system water. A copper fin-tub coil inside the tank transfers heat from system water to domestic water. The adjustable aquastat just above and to the left of the tank sets the limit for the DHW-water temperature. We recommend a setting of no more than 120°. If the DHW aquastat is set above 145º F the fixed, manual-reset high-Limit supply-water thermostat on the MZ may trip, causing nuisance callbacks.

The temperature of DHW is independently controlled and regulated by adjustable settings on the MZ25S. The MZ25S also includes an adjustable flow setting device for DHW.

When there is a low DHW flow through the MZ25S, the system water in the tank will give up heat to the DHW and its temperature will fall until the aqustat closes. The MZ will add heat to the tank at faster rate than it is being taken out, and the temperature in the tank and in the DHW will rise until the aquastat is satisfied. Then the temperature will start to fall again until the aquastat calls for heat again. This situation presents little or no problem for laundry, dishwashing, hand washing or other common DHW uses.

MZ INSTALLATION & MAINTENANCE

INSTALLATION AND TECHNICAL

For steady water temperatures, the DHW water flow rate through the MZ25S must be high enough to keep the MZ’s burner on. If the user complains of DHW temperature swings, especially in the shower, install a thermostatic mixing valve between the hot and cold legs of the system. Make sure it is a thermostatic, not a tempering valve. Also make sure that the temperature setting of the MZ25S is at least 15° above the desired mix temperature of the thermostatic valve (even if it means a higher than needed gpm valve is used), or there may be temperature fluctuations.

NOTE: The DHW performance of the MZ25S is not exactly like that of a regular hot water heater, so make sure that you or your customer understand its limitations. Filling a bathtub will take longer, since most wide open spigots will not yield hot enough water for a comfortable bath. The filling process will have to be slowed in order to keep the temperature up. Make sure your customer knows this! If space is not critical, it is almost always better to use an MZ 25C and one of our BS tanks. The cost of the tank and valves are little more than the difference between the 25S and 25C. It has been our experience that those people who choose the MZ25S do so for the exceptionally high efficiency for overall DHW as compared to conventional standing-pilot, gravity-vented gas water heaters, and easily adjust to the subtle differences.

Table 1 may be helpful in balancing MZ25S DHW systems.

Table 1

MZ25S Leaving water Temperatures, Degree F.

GPM

1.5

1.75

2.0

2.25

2.5

2.75

3.0

3.25

3.5

3.75

Temp

Rise

105

35 F.

Inlet Water Temp

140

125

114

105

40 F.

Inlet Water Temp

145

130

119

110

103

45 F.

Inlet Water Temp

135

124

115

108

102

50 F.

Inlet Water Temp

140

129

120

113

107

102

55 F.

Inlet Water Temp

145

134

125

123

112

107

103

100

60 F.

Inlet Water Temp

139

130

128

117

112

108

105

102

APPROXIMATE DHW PERFORMANCE OF MZ25S AT VARYING FLOW RATES AND INLET WATER TEMPERATURES. ALL TEMPERATURES ARE IN FAHRENHEIT.

First column gives flow in gallon per minutes.

At any steady gallons per minute (GPM) flow rate, the MZ will raise the temperature of the inlet water by a specific amount. That temperature rise is shown in the second column.

Third, and subsequent columns, gives inlet water temperature rising 5º F increments (top row) and the leaving domestic hot water (DHW) temperature (remaining rows.)

CONDENSATE:

Condensate removal can be accomplished by letting it drain into the building’s normal drain or septic system. The MZ’s condensate output depends on the return water temperature of the heating system. Colder return water means higher efficiency and more condensate. Over time condensate will eat concrete, iron and copper drains. Most drain water is alkaline which will neutralize condensate. Percolating condensate through crushed limestone will neutralize it. If no gravity drain available, an acid-proof condensate pump will do the job.

CHARGING & LEAK TESTING:

It is assumed that the system into which the MZ is being installed is a leak-free system. Leaks in the system will damage the heating system and void the warranty. If there are leaks in the system, fresh water will have to be added to the system to replace the lost water. The addition of fresh water, over time, will always bring air and dissolved minerals into the heating system and will dilute the corrosion inhibitor. All of which will cause a failure.

The proper concentration of BIONIBAL corrosion inhibitor (1% by volume for all metal pipe systems and systems with oxygen barrier tubing, 2% by volume for non-barrier systems) that is shipped with the MZ will completely protect the MZ and the system it is connected to from corrosion if kept at the right strength. BIONIBAL does not deteriorate over time or get used up over time. Additional Bionibal is available form MPI.

Once the system is properly charged with:

• Water

• BIONIBAL, or

• Water, glycol BIONIBAL mixture, it should remain stable indefinitely.

Before the MZ is connected, the piping system should be filled with clean, neutral P-h water to a pressure of 100 PSI. If there is no change in pressure after 24 hours, the system can be assumed to be leak-tight. The system should also be visually inspected as thoroughly as possible. If any leaks are found, they must be repaired.

The MZ has a brass, male-hose-thread, fill-and drain valve operated by a stainless-steel ball valve. We recommend that the MZ not be permanently piped to the structure’s potable water system, unless local code requires auto fill. If auto-fill is installed to the system, our recommendation is that it be turned off. The flow switch in the MZ prevents low-water firing. It is normal for heating systems to lose a very small amount of water over time through valve stems or similar fittings. This trivial amount of water can easily be replenished during normal maintenance. There is a clear plastic tube in the MZ that fits over the nozzle on the air vent and prevents the water that typically spits out of the nozzle from staining the inside of the MZ.

On start up, the MZ should be run in the heating mode until the entire system is brought up to operating temperatures.

Do not leave city water pressure on the auto-fill during normal heating system operation since any system leaks will cause the Bionibal corrosion inhibitor to be diluted and eventually

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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-oxygen-

barrier 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.

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:

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.

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.

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

ÍGas Inlet

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.

Pipe length

(feet)

100

150

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.

(FOR REFERENCE ONLY)

Capacity of pipe for pipe size (ft3/hr)

1/2"

132

3/4"

278

190

152

130

115

520

350

285

245

215

175

150

120

1 1/4"

1050

730

590

500

440

360

305

250

NATURAL GAS TO LP GAS CONVERSION AND HIGH ALTITUDE ADJUSTMENT:

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.

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.

MZ INSTALLATION & MAINTENANCE

INSTALLATION AND TECHNICAL

Important note about altitude: Since atmosphere thins

as altitude increases, there is less oxygen available to support combustion at high altitude. The combustion-air

blower used on the MZ was designed specifically for the MZ. Its normal operating speed is partly determined by the density of the air moving through it. As altitude increases, the MZ’s blower spins easier and faster in-

ALTITUDE

Combustion Chamber unit pressure

ADJUSTMENT DIAGRAM

Ionization probe

Air pressure switch

Outlet pressure

MZ25 Nat. 2.8

MZ25 LP 5.5

MZ 40 Nat or LP 2.8

Pressure

Tap P2

creasing the amount of air. The MZ can be used up to 6,000 feet dependinc on vent length of run, aAbove 6,000 feet, adjustment of the air-pressure switch is necessary.

Gas orifice is located in gas-line side of union. Spray union with penetrating oil and tap wrench to locate nut on union. Gas line may need to be reamed to accept LP orifice for MZ40.

Ignition electrode

Air orifice location

Air pressure switch test point

Gas

pressure

Inlet pressure

must stay within 5”

and 7” WC for

Natural Gas and

11” and 13” WC

for LP gas

regulator

Servo-

system

Pressure

Tap P1

Solenoid

Gas valve

To avoid pressure, remove cap, turn adjustment screw clockwise to increase, counter clockwise to decrease. Cap must be on to measure.

ALTITUDE ADJUSTMENT

1) Fire heating system. Let run for five minutes. Measure and set CO at 30 PPM for natural gas (50 PPM for LP gas ). There is a tapping in the vent elbow inside the MZ’s cabinet just to the left of the flue-gas exit from the MZ for flue gas measurement. Note that the cap that covers the gas valve’s adjustment screw must be in place when CO measurement is made.

2) Take cover off of air-pressure switch. With heating system running, jump contacts so that heating system continues to fire when switch opens.

3) Very, gradually block inlet air to blower with something light and stiff, such as a credit card, until CO reads between 500 and 750 PPM. (NOTE: Blocking half of the blower inlet may raise CO only slightly. As the critical point of

Ignition accelerator

Air fan

blockage is reached where CO does begin to ramp up, a very small increase in blockage makes a very large increase in CO. It is best to increase blockage VERY slowly.) Remove jumper wire from switch. Burner will go out and CO will begin to fall.

4) Adjust air pressure switch VERY, gradually counter clockwise to the point where the switch closes, which will then cause the burner to relight.

5) Unblock blower inlet air.

6) CO measurement should then return to 30 PPM for natural gas ( 50 PPM for LP.) Check to verify that CO is normal.

7) Replace terminal cover on air-pressure switch, replace plug in vent pipe, replace MZ cover. Cycle unit to verify normal operation.

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INSTALLATION AND TECHNICAL

VENT KITS FOR MZ HEATING SYSTEM:

MINIMAL STARTER KITS

MP# Description Page No.

#9501 Horizontal Flue Kit, 1 Meter ................ 12

#9531 Vertical Vent Kit.................................. 14

HORIZONTAL CONCENTRIC BUILT-UP VENT SYSTEMS

#9501 Horizontal Flue Kit, 1 Meter ................ 12

#9502 Horizontal Flue Kit, 2.5 Meter .................

#9503 Horizontal 90 ° Elbow ......................... 12

#9504 Horizontal 1 Meter Stick ..................... 12

#9520 Flue Adapter to Plastic Run................ 12

VERTICAL CONCENTRIC BUILT-UP VENT SYSTEMS

#9505 Vertical Flue Adapter .......................... 13

#2206 Vertical Through-Roof Terminal 52" long

........................................................... 13

#2203 Vertical 1-Meter Stick ......................... 13

#2202 Vertical 1/2 Meter Stick ...................... 13

#2204 Vertical 45° “L” ................................... 13

#9031 Vertical 25-45° Roof Cooler................ 13

#9032 Vertical 35-55° Collar, Black............... 13

1. Horizontal Concentric:

The most economical venting location for the MZ is on or near enough to an outside wall so that the vent box that fits the top left-hand side of the MZ is within 38" of the final termination point of the vent run. (see Fig. 1)

Use part number 9501 to provide all the necessary parts for the above venting option.

36”

Maximum

Minimum 6” clearance

MZ Heating System

The MZ’s horizontal vent system can run straight back from the MZ or right, left, or over the top of the MZ at 90º increments using the standard vent box mounting procedure. Vents must slope back to the heating system. A minimum drop of 5/8th inch per foot of horizontal run must be provided.

2. Vertical Concentric:

For vertical concentric venting, Monitor Products, Inc. kit number #9505 is required. (see fig. 2).

17.5” (.44 meter)

Fig. 1

Overhang is 2.5”

Intake pipe 1” overhang

Fig. 2

#9033 Pipe Support Ring .............................. 13

#9034 Vertical Black-Plastic Ceiling Trim ...... 13

#2205 Vertical 90° “L” ................................... 13

VENTING:

The MZ is designed for direct, concentric venting, although it can be properly vented in other ways. The MZ is vented in 3 basic ways.

1. Horizontal Concentric

2. Vertical Concentric

3. Separated Exhaust & Inlet Air in 3" PVC

Horizontal vs. Vertical: The final terminal point of the vent run determines which vent system should be used for the MZ.

THE SYSTEMS HAVE DIFFERENT DIMENSIONS AND CANNOT BE MIXED. The horizontal system is less expensive

than the vertical system, foot for foot and fitting for fitting. For vent runs in excess of 30 feet, contact MPI. All length of runs must be accessible for inspection.

Intake adapter

Adapter and gasket

MZ Heating System

Once the kit has been installed, the venting can be continued by way of utilizing different lengths of concentric pipe, 90º elbows, and 45º elbows. Part numbers & descriptions shown in Table 1. Vents must slope back to the heating system. A minimum drop of 5/8th inch per foot of horizontal run must be provided.

TABLE 1

PART NUMBER CONCENTIC PIPE LENGTHS

2202 1.65 Feet (. 5 Meter)

2203 3.3 Feet (1 Meter)

2204 Vertical 45°

2205 Vertical 90°

MZ INSTALLATION & MAINTENANCE

INSTALLATION AND TECHNICAL

After the area of termination has been selected use part number #2206 and install vent termination utilizing support bracket included with kit. (See Fig. 3)

Fig. 3

Support bracket (included with kit)

Termination of a vertical flue must

Fig. 4

30 cm - 12” Minimum

provide at least 12 inches (30 cm) above the roof jack to the combustion air

40 cm

16”

Minimum

intake collar. If there are two units in the installation with vertical flue systems, the termination of the systems must be separated by 16 inches (40 cm). (See

Fig.4)

s mmuusstt

3. Separated Exhaust & Inlet Air in 3" PVC

In a situation where it is desirable to route the venting in a nonconcentric fashion, use part #9530A as seen in Fig. 5. This kit will allow for the exhaust to be piped independently of the intake.

Fig. 5 9530A

3" Elbow, CPVC

2.5" X 9 Long pipe CPVC

Trim so that reducing bushing fits snug on top of box.

Bi-Directional box

Gasket

• BI-DIRECTIONAL VENT KITS: USE FOR TWO PIPE APPLICATIONS

• ALLOWS FOR 3" PVC VENTING

• THIS ARRANGEMENT CAN BE TERMINATED THROUGH WALL LEFT, RIGHT, OR REAR

3" Coupling CPVC

4’ of 3" CPVC pipe

3" X 2.5" Reducing bushing

Locking ring

3" Male threaded apapter CPVC

The venting then can be continued in 3" PVC for intake air, and 3" CPVC for exhaust air. Termination then can be piped in a conventional manner. Inlet and outlet should be in the same wind plane.

The flue/combustion air system piping should be installed observing the following criteria:

• For vent lengths in excess of 30 feet, contact MPI

• For each 90º elbow used in the flue system, subtract 3.3 feet from the total allowable length.

• For each 45º elbow used in the flue system, subtract 1.65 feet from the total allowable length.

• Horizontal runs of the flue system must pitch down 5/8" per foot of length towards the heating system to facilitate proper flue products condensate drainage.

• Termination of a horizontal flue system shall not be less than 6 feet above walkway. Take care to minimize the likelihood of flue/combustion air intake blockage. Vertical flues must intake and discharge above the snow line.

• Do not place the flue terminal less than 3.3 feet from a ventilation hole or opening in a building.

• Termination should be at least 2 feet above the snow line.

• All flue-piping components must be assembled to provide an airtight flue/combustion air system.

Drain slope towards inside 5/8” per foot

Dimensions

Inches

5.43

4.33

mini

6.00

2.95

2.76

2.64

138.0

110.0

152.4

75.0

70.0

67.0

Flue gas outlet 2.95”

(PP dia. 75)

Inspection hatch screw

Air inlet 4.33”

(PVC dia. 110)

9501 KIT FLUE

slope

back to

system.

5/8” per

foot of

run.

Intake pipe 1”

overhang

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INSTALLATION AND TECHNICAL

Polypropylene dia. 75

Dia. 2.95”

HORIZONTAL CONCENTRIC VENTING: SHORT VENT RUNS

9051 Horizontal Flue Kit

PVC dia. 110 Dia. 4.33”

Positioning slot

Intake pipe - slides over exhaust pipe

The MZ can be supplied with a standard length flue, which can be used to run through a wall up to three feet thick directly behind the MZ. For greater lengths, specify with your order.

This end is final wall termination

This arrangement recommended for vent runs shorter than 4 feet. This arrangement can be terminated through wall left, right, or rear.

HORIZONTAL CONCENTRIC VENTING: UP AND OVER LONG VENT RUNS

9503 Exhaust elbow inside intake elbow

9504 Exhaust pipe inside intake pipe (cut length as needed)

9520 Adapter and gasket

39.36”

1 meter

MZ Heating System

9501 Still needed for termination

End view

(assembled)

This arrangement recommended for vent runs longer than 4 feet. Order lengths of 9504 to complete desired vent lengths.

MZ Heating System

* Note: Direct connection of # 9503

MZ INSTALLATION & MAINTENANCE

DO NOT USE

INSTALLATION AND TECHNICAL

9530A KIT FOR 3” PVC VENTING

2.5” x CPVC Pipe. Trim so that Reducing Bushing Fits Snug on Top of Box

Gasket Between Box and Heating System

Flue gas out

Cap

Flue gas from MZ

3” CPVC Elbow

2.5” x CPVC Bushing

Connection Box

Combustion-air In

Existing chase used for flue and intake-air runs (for instance, chimney, after cleaning). Continuous 3" PVC run for intakeair is preferred, especially if very clean chase cannot be assured. DO NOT USE CHLORINATED CLEANERS FOR CHASE LEANING!!! Combustion air in. Flue gas out.

Combustion-air to MZ

Top of heating system to Top of Elbow,

11.75”, Minimum

3" X 4’

CPVC Stick

Retaining ring Fits Inside of

3" X 3" CPVC TO PVC Coupling. Remainder of Flue

can be 3" PVC

Box to secure Bushing.

Combustion Air Inlet Bushing. Box to 3" PVC. Combustion Air Inlet Run Can be 3" PVC.

Products of

Combustion Out

Combustion-air In

Foundation Wall

NOTE: Inlet and outlet must be in same wind plane. Otherwise they can be any distance above grade or from each other as long as flue gas cannot reach inlet and as long as the entire system meets the requirements of the National Fuel Gas Code.

All pipe 3" PVC. Connect to MPI’s accessory #9530 A, separated vent kit.

Soil or Snow Line

Exterior Wall

18” Minimum

Two Foot Minimum, no Maximum

CONCENTRIC FITTINGS FOR VERTICAL DISCHARGE VENTING

Polypropylene/PVC Concentric - Vertical Terminal - For Flat or Sloping Roof

Reference Color Length I.D. O.D.

2206 Black 42.5” 3.15” 4.9”

Useful length under sleeve tile - 16.9 inches (0.43 m)

Extention - Joint Fitting

Reference Length I.D. O.D.

2202 19.7” 3.15” 4.92”

2203 39.4” 3.15” 4.92”

Useful length after assy. - 17.7 inches (0.45 m) [2202]or 37.4 Inches (0.95 m) [2203]

(1080mm) (80mm) (125mm)

(500mm) (80mm) (125mm)

(1000mm) (80mm) (125mm)

Concentric Fittings

Reference Angle I.D. O.D.

2204 45 deg 3.15” 4.92”

(80mm) (125mm)

2205 90 deg 3.15” 4.92”

(80mm) (125mm)

Sleeve Tile with Adaptable Coupling

Reference Slope Covering Color

9031 25-45 deg Til Tile Red

type

9032 35-55 deg Slate- Black

Shingle

Polypropylene/PVC Concentric Elbow

-joint fitting

Fastening collar (each flue piece must be adequately supported.)

Reference Diameter

9033 4.92”

Collare are essential to bear the weight of the vertical extension.

(125mm)

Polypropylene Ceiling Plate to Cover Rough Opening

Reference Color

9034 Black

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INSTALLATION AND TECHNICAL

VERTICAL CONCENTRIC VENT

9505 Vertical Flue Adapter

9531 Vertical Vent Kit

This Pipe

replaces

this pipe

MZ HEATING SYSTEM

9505 (See above) and 9505 (See page 13)

These parts are needed to fit the vertical-vent system to the MZ. The internal flue pipe that ships with the MZ is sized for the horizontal flue system and side-by-side two-pipe vent systems. They are used with the MZ more often than the vertical, concentric vent system is. When the vertical-vent system is used, the MZ’s inner vent pipe must be replaced with one that matches the size used for the vertical vent system

Through-roof terminal

Pipe-support ring

MZ HEATING SYSTEM

Slope Venting Back to System a Minimum 6% Grade (5/8” per foot)

4.33” or (138mm)

Terminal must exit a minimum of 18” above the snow line mandated by local code or National Fuel Gas Code.

Intake Pipe 1” Overhang

6” Minimum

HEATING SYSTEM

MZ INSTALLATION & MAINTENANCE

INSTALLATION AND TECHNICAL

Part 9503,

Horizontal 90

Degree Elbow

Part 9504, Horizontal

I-meter Stick, Cut to Length if Necessary

Part 9520,

Flue Adaptor

to Plastic Run

MZ HEATING SYSTEM

Exterior Wall

Part 9501, Horizontal Flue Termination Kit, Cut to Length Products of Combustion Out

Combination Air In

Foundation Wall Above Grade

recommended that a lubricant such as soapy water be used to facilitate the slip-fit connection. The male end of each connection should be inserted into the corresponding female end until it bottoms out.

All flue components should drain back to the MZ.

The MZ an all of its flue parts are zero-clearance to combustibles.

If the terminal point of the MZ as shown in this drawing is below the local snow line, use appropriate numbers of parts 9503 and 9504 to raise the terminal point. Local codes determine flue distance above snow line. Always terminate with the terminal end of our 9051. Always terminate in the horizontal plane. The horizontal system will not work in a configuration in which the terminal end of part 9501 is in a vertical position.

ELECTRICAL:

• Electrical connections and control strategies, including the summer / winter switch.

The installation must conform to one or more of the following, as applicable:

A.) Local codes or, in the absence of local codes, the National

Fuel Gas Code, ANSI Z 223..

B.) Canada-CGA B149 installation code and/or local

installation codes.

C.) The National Electrical Code ANSI/NFPA No. 70.

D.) CSA Standard C22.1 and Canadian Electrical Code PZ.1.

ELECTRICAL CONNECTIONS FROM SITE

The heating system, when installed, must be grounded in accordance with local codes or, in the absence of local codes, with the National Electrical Code, ANSI/NFPA 70 and the CSA Standard Canadian Electrical Code C22.1.

The MZ is designed for 120 volt, 60 cycle, three-wire (load, neutral, and ground) current and draws about 112 watts in full operation. The electric supply should be from a dedicated 15 amp circuit.

The MZ is easy to wire. Trim the minimum amount of material from the pyramid-shaped grommets in the MZ’s cabinet so as to provide a snug fit for all wiring in and out of the MZ. Run low and high voltage wires through the strain reliever on the left side of the control panel, through the chase and into the control panel. Make sure polarity is correct or the unit will lock out right after lighting.

There are 2 black jumper wires going into 3 terminals to the left of the high voltage block. From left to right they are T3, T2, & T1.

Terminal Must Exit at the Depth Above snow Line Mandated by Local Codes of National Fuel Gas Code.

Notes: All flue parts are concentric. They exhaust the products of combustion through a nominal 2.7”

Snow Line

pipe that is enclosed and supported within a nominal 4” pipe. The 4” conveys combustion air back to the MZ.

All flue-pipe connection are gasketed slip-fit. It is

Caution: The 24 volt transformer supplied with the MZ is only intended to operate the

heating system components. If zone

valves are being used an auxiliary transformer of the proper VA rating must be installed separately. Please see zone valve manufacturers data sheets for proper transformer sizing and wiring recommendations. Attaching zone valves

to heating system transformer will cause damage and will void warranty.

Note: If both jumpers are left in place, the pump will run continuously and the MZ will maintain the aquastat setting controlled by the adjustable black knob on the MZ’s control panel.

Jumper position and the summer/winter switch have no effect on a priority zone, or a Domestic Hot Water call coming in to the MZ through the wiring harness that is part of the DHW kit.

If you desire constant circulation in the heating (winter) mode (water moving through the “B” side of the 3-way valve at all times if MPI’s DHW Kit is used for prioritizing or if the MZ 25S is used) and the thermostat or heating system control firing the burner as needed, then leave the jumper in T1, T2 and the heating system control in T2, T3. Constant circulation has multiple benefits. We recommend designing for constant circulation whenever practical.

T3 T2 T1

120V-60HZ

N L

T3 T2 T1

120V-60HZ

N L

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INSTALLATION AND TECHNICAL

To call for burner and pump at the same time, leave the jumper in T2, T3 and the heating system control in T1, T2.

120V-60HZ

T3 T2 T1

With the heating system’s summer/winter switch in the summer (sunshine symbol) position, the heating system will not respond to a call for heat from a space heat thermostat or other space-heat control.

N L

! AT T E N T I O N !

No attempt should be made to connect electrical wires to any other location except

1. The indirect hot water storage tank wiring kit, which plugs into the terminal socket on the right side of the control panel cluster; and which also includes strap-on aquastat to be installed inside the MZ and wired in series with the MZ’s builtin high limit flue and leaving water safety limits.

(See page 18).

2. Two-stage external control of MZ 20-40C.

NOTE: Two-stage operation of the Model MZ40C is automatic: On a call for heat, both burners fire. When return water temperature gets to between 9º F to 14º F of the setting on the adjustable aquastat on the face of the stage shuts off and the 1st stage runs until the heat call is satisfied. If return-water temp falls, the second stage comes back on.

PREPARATION FOR USE/INITIAL START-UP:

Should overheating occur or the gas supply fail to shut off, turn off the manual gas control.

Do not use this unit if any part has been under water. Immediately call a qualified service technician to inspect the unit and to replace any part of the control system or any gas control, which has been under water.

Before initial start up of the unit, the installer should:

• Check that the gas circuit is leak free.

• Carefully flush out the gas pipes. Where the installation is new, the purge serves to evacuate the air that is contained in the pipes so that the unit has sufficient fuel. The presence of air in the gas prevents the burner from lighting and results in the flame control unit safety device cutting in. This applies to a new installation running on either natural gas or LP. For the latter, the storage tank must also be properly flushed before initial start up.

ATTENTION! All necessary safety precautions should be taken when venting the gas.

heating system, the 2nd

Flushing the gas will also have the effect of removing any oxide particles from the pipes produced during brazing.

• Check that the flue outlet and air intake is leak free and unobstructed.

• Check for the appearance of the flame through the round observation window inside the hinged door just above the controls.

• Check that the installation is filled with water. The water pressure should equal 12 PSI.

The MZ heating system has two air purge valves, one on the heating outlet, the other on the domestic hot water heater (25 S model dual-functioning unit).

• Check that the electricity supply is connected correctly: 120 V-60 Hz, with correct polarity.

• Check that the siphon trap is filled with water. Check that the condensate outlet is connected.

• Make sure the circulator is running. If not, remove cap covering shaft and manually start. The adjustable domestic hot water thermostat is factory set on the MZ 25S. If it becomes necessary to adjust this position it’s recommended that for energy efficiency the setting be kept at the minimum water temperature consistent with the consumer’s needs. The maximum DHW temp is 145°. Keep in mind there is a hot water scald potential if the thermostat is set too high.

COMMISSIONING:

When operating the unit for the first time, the installer must verify:

• That the gas valve works properly;

• That the flame control works properly;

• The burner setting: CO, CO2, and gas valve settings

are correct.

1. Open the manual valve on the gas inlet.

2. Switch on the main heating switch, or circuit breaker.

3. Set the lighted on/off switch on the control unit to the “on” position.

4. Put the circulating pump switch to the “winter” position (snowflake). In the “summer” position (sun), the circulating pump only works when the domestic hot water tank requires heating (MZ 25S or C models with indirect hot water storage tank).

FLOW VERIFICATION:

In order for the MZ to function properly a minimum amount of water must flow through the MZ’s heat exchanger to remove the heat being produced. There is a flow switch inside the MZ that will not allow the MZ to fire unless there is minimum flow.

Approximate external feet of head available from the Grundfos UPS1542 in the MZ25 series heating system at flow rates shown.

GPM 3.5 4 6

Speed 3: FT of 12 10 5 Head Available

MZ INSTALLATION & MAINTENANCE

INSTALLATION AND TECHNICAL - ACCESSORIES

The pump in the MZ40C is generally not capable of pumping normal heating zones outside the heating system. Such applications normally will require additional series pumping or a primary-secondary layout. The pump WILL supply adequate flow for proper operation of one of our BS indirect tanks through our DHW kit.

When the MZ is properly connected to a primary-secondary pumping layout, the MZ’s pump will provide the necessary flow. When the MZ is directly connected to a system in which the pump inside the MZ is used to pump the entire system, the system must be checked for proper flow.

If the system is a single-zone system or a multi-zone system balanced with manually set circuit setters, there either will or will not be sufficient flow to close the flow switch. If the system is multi-zone with zone valves used to open and close zones on demand, the system can be checked for proper flow by running the system one zone at a time with all of the other zones off.

If any of the zones restrict flow so much that the flow switch will not close, adjustment to the system will have to be made, such as wiring the system so that the restricted zone can only operate when another zone is running or adding a pump to that zone, increasing the pipe diameter or zone valve selection for that zone, or installing a differential pressureoverflow valve.

LEAVING WATER LIMIT-SWITCH FUNCTION

There is a manual reset high temperature limit switch in the water jacket of the MZ. In systems with low flow or systems

with water-glycol mixes, it is possible for that manual reset switch to trip before the call for heat has been satisfied. In order to check for this possibility, the system should be run with the adjustable limit switch on the MZ’s panel turned full clockwise. The temperature - control devices in the system (thermostats, aquastats etc.) should be adjusted to deliver the highest temperature that this application will require until those temperature-control devices are satisfied.

NOTE: If the system has been designed to require high temperature (>176° F.) water at design conditions, care must be taken to prevent nuisance trips of the MZ’s manual-reset high-limit switch. The best ways to do that is to provide for constant circulation in the winter mode, or add more radiation.

In multi-zone applications, each zone should be run individually to assure that nuisance limit-switch trips will not occur during the heating season.

If the manual reset switch trips, pull the adjustable-limit switch knob and adjust the wire stops in the knob so that the adjustable limit shuts the MZ down before the over-limit switch opens. If the leaving-water temperature at that setting will satisfy the structure’s need for heat on a design day, the problem has been solved.

If the leaving-water temperature will not satisfy the need for heat at that setting. Changes to the distribution system, piping arrangement, pumping provision, control system, or the addition of radiation may be appropriate. Do not install MZ heating systems in jobs that require more than 176º F. water.

I I I . A C C E S S O R I E S

BS INDIRECT WATER TANK

Models

Nominal Storage Height Diameter All Pipe Connections Max DHW Pressure Aquastat Range Aquastat Differential Inspection Port Opening Nominal Exchanger Power (170ºF Av. system Water Temp) MZ25 Nominal Reheat Time from 50ºF to 140ºF Stored MZ25 Continuous Output at 110ºF MZ40 Nominal First Hour Draw at 70ºF Rise Dry Weight Ratings assume cold-water inlet at 50ºF, heating system circuit average temp of 170ºF and heating system output at least equal to the nominal heat exchanger power shown above. Tank output cannot exceed heating system output.

A. 316 L austenitic

stainless steel coil.

B. 316 L austenitic

stainless steel tank.

C. Molded, rigid

removable insulation.

D. Removable ABS

plastic casing.

Gal. IN. IN. MPT PSI F F IN. MBH MIN. GPM GAL. LBS.

E. DHW cold inlet. F. DHW hot outlet. G. Heating system

circuit inlet.

H. Heating system

circuit outlet.

I. Pressure-

temperature relief

BS 25

27.5"

23.6" 3/4" 100 68-176ºF

10.8ºF

3.9" 115 10

3.8 250 71

BS 40

36.4"

23.6" 3/4" 100 68-176ºF

10.8ºF

3.9" 115 15

3.8 260 86

tap and/or DHW recycling circuit tap.

J. Inspection opening

and anode access.

K. Thermometer. L. Aquastat.

BS50

45.3"

23.6" 3/4" 100 68-176ºF

10.8ºF

3.9" 200 12

6.5 430 121

BS 80

80 63"

23.6" 3/4" 100 68-176ºF

10.8ºF

3.9" 210 17

6.7 465 159

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ACCESSORIES

DHW KIT-MPI #9523

• Rapid way to offer two temperatures

• Priority to DHW Zone

MZ Heating System

built-in control feature that allows the non prioritized spaceheat side to be regulated by the main temperature knob and the high temp side controlled by a strap-on aquastat.

The kit contains a factory wiring harness, 3-way valve, motor, and strap on aquastat. The heating system output’s first connection is the “AB” port of the 3-way valve. All system water flow thru the “B” port will be controlled by the MZ’s main temp knob and the heating thermostats. The “A” port will be the primary hi temp circuit for DHW recovery. The “A” port is also a priority zone.

Wire the aquastat in series with the high limit on the MZ’s water jacket. Strap the bulb to the leaving water pipe just behind the combustion- air fan. Cover with foam insulation. Secure with nylon ties; not ultra tight. Adjust leaving water temp. at 170º to 175º F. Scratching the paint off the water pipe will give a more accurate temp reading.

From Factory To 3-way To Indirect tank or Harness valve motor High temp thermostat

Either black to Black

Either black to #2 on BS tank

Brown to #1 on BS tank

Orange to Brown

Heating System Ground

Monitor’s domestic hot water kit (part #

9523) allows for the zoning and control of any indirect tank, or any two or more temperature applications - one usually being DHW recovery - with the higher temp

Grey to Blue

Green Ground terminal

(connect to ground) on tank

Red - not used

being a priority. This system utilizes the

MPI #9110

MZ MOD CONTROL / MPI #9110

The MZ Mod Control comes with modulating control, 2 strap on sensors, instruction manual, outdoor sensor, & wiring harness.

MZ MOD CONTROL SPECIFICATIONS Control — Microprocessor PID Control. This is not a safety (limit) control Enclosure — Enclosure D, back Noryl Plastic Optional Devices — Universal Sensor Dimensions — 4-3/4" H x 2-7/8" W x 1-7/8 D (120 x 74 x 48 mm) Approvals — CSA C US, meets ICES & FCC regulations for EI/RFI Power Supply — 24 V 50/60 Hz 75 VA Pump / Stage 1 Relay — 120 V (ac) 5 A 1/6 hp, pilot duty 240 VA Stage 2 Relay — 120 V (ac) 3 A 1/6 hp Alarm Relay — 24 V (ac) 3 A 1/6 hp Ambient Conditions — Indoor use only, -40 to 140º F (40 to 60º C) <90% RH non-condensing Sensors Include — NTC thermistor, 10 kW @ 77º F (25º C 0.2º C) B = 3892 2 of Universal Sensor and 1 of Outdoor Sensor

Control Features:

• Versatile, easily adapts to all common piping methods.

• Heating system inlet and outlet sensors

• Optional primary loop sensor

• Optional DHW sensor.

• Smart control feature can adapt to the building.

• Exercising of heating system pump.

• Purging of heating system based on time.

MZ INSTALLATION & MAINTENANCE

• Display of temperatures & run times

• Error messages for sensor failure with alarm signal.

• Minimum on and off delays

• Adjustable differential.

• Smart control feature adapts to each heating system.

• Built-in test sequence.

• Building occupants can be locked out of installer’s settings.

MAINTENANCE - TROUBLESHOOTING

I V . MAINTENANCE

MAINTENANCE CONSIDERATIONS

The MZ is an extraordinarily durable and well-designed heat source. It is built in the same manner as a fine boat or airplane. While there are parts of the MZ that will eventually wear out, they are easily replaced. The heart of the MZ, the heat exchanger, is made of high-grade stainless steel and will last for many, many years of normal service. Premature failure of the MZ’s heat exchanger can be caused by the ingestion of contaminant’s in the combustion air, the use of very hard, very acidic or very basic water in the MZ, or continuous addition of water to the system.

In order to minimize no-heat calls other than those that are the unavoidable result of rare events such as a lightning strike or the failure of one of the mechanical or electrical components of the MZ, we recommend that the MZ be given an annual clean-andcheck. The few drops of water that will normally leak out of a system over time can easily be replenished during maintenance.

If the MZ is not cleaned and checked regularly, there will eventually be an interruption in the function of the MZ due to one of the following, easily remedied events:

1) The air-pressure switch will not open due to a reduction in airflow through the MZ due to an accumulation of dirt on the inlet side of the combustion-air fan, the accumulation of dirt in the burner, the accumulation of ash on the heatexchanger’s fin tube or the accumulation of ash in the condensate trap.

2) The interference with ignition due to flame erosion of the igniter rods.

Annual service will bring the chance of nuisance no-heat calls to near zero.

MAINTENANCE PROCEDURES

(Approximate time, 15 minutes.)

1) Disconnect plastic tube at top of fan. Grasp plastic nozzle that connects fan to the burner with right hand. Rest left hand on combustion chamber and pull fan to right. Fan will slip off of burner. Disconnect fan wiring connector and set fan aside.

2) Disconnect plastic hose, igniter wire, flame-proving wire and ground wire from burner top. Open union in gas line at burner top. Four bolts secure clips that hold burner to combustion chamber. Remove front clips. Loosen bolts and rear spin clips so that burner can be removed and remove burner.

3) Using plain water, wash heat exchanger fin-tubes. Water will run out through condensate trap. Unscrew bottom half of condensate trap. Check trap for accumulation of ash/ mud and clean if necessary. Fill the trap with water and replace it.

4) Inspect flame proving rod and igniters. Replace if worn. Regap igniter according to specifications in the Technical Instruction packed with heating system. (2.25 mm, 0.09 inches.) Brush or vacuum burner face. If vacuum is at hand, vacuum burner outlet. Check fan inlet for dirt on blades and clean if necessary. Re-connect burner, hoses, wiring, and fan.

5) Fire MZ, check safety limits and CO and/or CO2 according to values in installation instructions.

V . TROUBLESHOOTING

QUICK TROUBLE-SHOOTING GUIDE FOR MZ HEATING SYSTEMS:

!WARNING!

Only trained HVAC service people should do MZ troubleshooting. The MZ is fed by an electrical current source that could electrocute. Take care to avoid shock. Wear safety glasses!

Make sure that the MZ has power, gas, that there is water in the heating system and that there is a call for heat. Check all visible hoses and wiring inside the MZ for integrity and good connection.

Is pump running?

Toggle on-off switch. Water pressure will change when pump starts. If no change, remove cap from pump end. Rotate shaft with screwdriver. If shaft rotates freely, check power to pump (CAUTION, 110 VOL TS). If no power to pump, check pump relay and associated wiring.

Fan runs but MZ doesn’t try to fire?

Check for air-pressure-switch operation with voltmeter. If switch does not close, check for blocked flue, blocked condensate trap or drain. If MZ has been in service for a long

time, make sure that heat exchanger is not dirty. Inspect venting to insure compliance with installation instructions.

Is water-flow switch closing?

Disconnect flow-switch wiring-harness. Jump connections back to MZ. If fan runs with connections jumped, most likely cause is low system water flow. Check for stuck valve, obstruction in piping, strainer or pump vanes clogged, etc. Use ohmmeter to check for flow-switch operation. Switch closes at 3.52 GPM for the MZ25 and 4.4 GPM for the MZ20-40.

Does the MZ try to fire?

Gas valve and spark normally act simultaneously about 20 seconds after air pressure switch closes. If attempt to light occurs, but no flame results, (flame failure), the ignition module will lock out, the fan runs continuously, and power has to be interrupted before another attempt to light will occur.

Is combustion-air fan running?

If pump runs and flow switch closes, combustion air fan should run. If not, verify call for heat, check that operating limit is not satisfied and that manual reset fixed high-Iimit switches are not open. If fan does not run, check fan power (CAUTION, 110 V.). If no power, check fan relay and associated wiring.

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TROUBLESHOOTING

Is there flame failure?

Likely flame failure causes: bad gas-air mixture (too little or too much gas), no spark, reverse polarity or poor ground. Check spark by looking up into sight glass at sharp angle. Check for proper gas pressure with manometer. Check power for grounding and polarity with volt-amp meter. Check ignitor electrode gap.

Proper gas-air mixture plus spark equals ignition. If you don’t have ignition at this point, re-check everything.

When you realize that the MZ is a heating system that requires nothing more than certain occurrences in sequence to operate, troubleshooting becomes very straightforward. There are no circuit boards (other than what may be in the Honeywell flame control module), only a few relays that dictate exactly what the MZ is doing, and if it not working, what it needs to do.

PROBLEM

MZ not running. Power switch not lit.

Power on, nothing happening. No heat or hot water.

POSSIBLE CAUSE

1. Power turned off, breaker off.

1. Check for high limit trip on top of heat exchanger or where flue exits at bottom.

2. Check that adjustable operating limit is closed.

3. Make sure there is a call for heat or hot water.

4. Transformer failed.

5. Make sure pump is running (this can be done by feeling for vibration or turning switch off and on and watching for movement in the pressure gauge).

Here is the sequence of events that occur during normal operation:

1. Power on to the unit

2. Call for heat - both T1, T2, & T2, T3 circuits must be closed or there must be a DHW or other priority call.

3. Adjustable limit, leaving water and flue limit switches closed.

4. DHW aquastat closed if priority call.

5. Fan full speed.

6. Pressure differential switch must close.

7. Gas valve open, spark.

8. Flame module proves flame and keeps gas valve open until high limit is reached, DHW aquastat is satisfied or call for heat is over.

Other than those sequential steps, there is nothing else that affects the MZs operation. Here is a troubleshooting chart:

REMEDY

1. Restore power.

1. Push to reset. If this occurs regularly, see below.

2. Check thermostat, jump T1, T2 & T2, T3. Make sure switch is on winter (snowflake)

3. Check wires

4. Check for voltage on 24V side, replace if none.

5. Check for power to pump with tester and / or listen for second relay from left to engage when power is on. If there is power but no movement, remove the silver slotted screw from the pump body and turn the shaft manually. If the pump starts, replace the screw. If it turns easily, replace the pump.

Call for main heat or priority heat has been verified. All limits are closed. No fan.

Pump is running, fan is running, unit won’t fire.

1. No water flow through the unit. Not enough flow to satisfy switch. Air in the system, or return water strainer clogged.

2. Obstruction to flow outside MZ (such as stuck zone valve).

Check position and integrity of tubes at air pressure switch. Make sure that tubes are not cut anywhere. Long tube from fan should see greater than 1.9 inches of water column and should be connected to + (plus) port on switch. If p is less than 1.9, clean and check fan. If the pressure difference between the tube from the fan and the tube from the combustion chamber is greater than 1.6 inches of water column (IWC) for the MZ25 or greater than .9 IWC for the MZ40, the switch should close. If pressure switch is OK, after blower has reached full speed, switch should close. About 20 seconds later, gas valve should open (loud click) and spark should commence (spark visible through sight glass when viewed at sharp angle from below).

1. Jump red & orange wires to flow switch. If unit starts and runs normally, either flow switch is bad (unlikely) or there is no or low flow.

2. Find and clear flow obstruction. To clean strainer, remove large nut behind fill/slash drain valve and pull out strainer. Clean or replace.

Listen for click for gas valve relay after fan has reached full speed. Watch for spark thru glass in chamber. (If there is no click or spark, remove the short clear hose from the black pressure switch. If the unit fires, the venting is restricted. If no change, jump the switch. If unit doesn’t fire after 30 seconds of full speed fan operation, replace Honeywell control unit. If there is a click but no spark, test for 110 volts to spark transformer. If there is voltage, test for high voltage with spare igniter. No high voltage, replace transformer. If there is high voltage, replace igniter. If the gas valve clicks and the igniter sparks, remove P1 on the gas valve a make sure there is gas to the unit.

MZ INSTALLATION & MAINTENANCE

TROUBLESHOOTING

PROBLEM

Unit fires normally and shuts off intermittently, fan still running. Relays chatter intermittently.

Unit fires briefly then shuts off.

Heating System makes hot water, but no heat.

Unit noisy during start-up and operation rumbles and vibrates.

POSSIBLE CAUSE

Intermittent signal to T3-2 or T2-1. Possible loose connection / poor connection inside or outside of MZ. Transformer in MZ overloaded by being used to drive external devices such as zone valves. Honeywell control unit failing.

Polarity incorrect at terminal, air in system, gas pressure too low.

Summer / winter switch on summer, no call for heat, no flow or not enough flow in heat zone(s), air in heat zone(s). 3-way valve stuck.

Gas pressure too high, mixture too rich.

REMEDY

Correct wiring. Isolate zone controller from unit with relay, or change end switch location to 0 voltage dry contacts. Check wiring connections. Replace control.

Reverse line / neutral wiring. Cycle unit to remove air and / or add more water. Increase gas pressure - if using propane, make sure conversion done properly.

Switch to winter (snowflake), jump T1, T2 & T2, T3; jump flow switch as directed above, remove air. Check for movement of white tab on 3-way valve. For dhw, tab should be toward valve body, for heat it should move away. Remove valve motor by releasing pin at base and rotating 1/8 turn. Manually check for smooth movement of plunger. If it sticks, remove and clean or replace.

Check inlet (P1) and outlet (P2) gas pressures. “means IWC means inches of water column. For natural gas, MZ25, P1 5 to 7"; P2 2.8". For LP, P1 11 to 13", P2 5.5". For natural gas, MZ40, P1 5 to 7", P2 2.8". For LP, P1 11 to 13", P2 2.8". Pressures must stay within the above ranges when firing and when not.

Unit noisy and popping; locks out easily with fan running.

Unit trips heat exchanger high limit regularly.

Gas pressure too low, intermittent gas service, low on propane, improper propane conversion.

1. DHW setting too high, temperature knob too high, abrupt Shut-off of system at high temperature

2. Strainer and/or pump clogged

Same as above.

1. Lower settings, do constant circulation, increase heat distribution means.

2. Lower temperature settings in structure, add radiation, and / or increase pumping rate.

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APPENDIX A

V I. APPENDIX A

Domestic

System Supply

Hot Water

SHEET

MONITOR PRODUCTS, INC.

MZ Heating System

Radiant Heat

3 Way Valve

(Kit # 9523)

(recirc when used)

Relief Valve

BS Tank

Top view of BS Tank

System Return

THIS DRAWING IS FOR REFERENCE ONLY. IT

IS NOT INTENDED TO DESCRIBE A COMPLETE

SYSTEM. EACH SYSTEM SHOULD BE DE-

SIGNED BY A PROFESSIONAL.

SCALE

SIZE FSCM NO. DWG NO. REV

/DRAIN

VALVE

PURGE

BALL VALVE

SHEET

System

MZ Heating

MZ INSTALLATION & MAINTENANCE

Radiant HeatRadiant HeatRadiant Heat

MONITOR PRODUCTS, INC.

THIS DRAWING IS FOR REFERENCE ONLY. IT

IS NOT INTENDED TO DESCRIBE A COMPLETE

SYSTEM. EACH SYSTEM SHOULD BE DE-

SIGNED BY A PROFESSIONAL.

SCALE

SIZE FSCM NO. DWG NO. REV

/DRAIN

VALVE

PURGE

BALL VALVE

APPENDIX A

MZ Heating System

System Out Sensor

MZ Mod Control

System In Sensor

Outdoor Sensor

SHEET

MONITOR PRODUCTS, INC.

THIS DRAWING IS FOR REFERENCE ONLY. IT

IS NOT INTENDED TO DESCRIBE A COMPLETE

SYSTEM. EACH SYSTEM SHOULD BE DE-

SIGNED BY A PROFESSIONAL.

SCALE

SIZE FSCM NO. DWG NO. REV

/DRAIN

VALVE

PURGE

BALL VALVE

Radiant Heat

Baseboard

System

MZ Heating

System

Supply

(recirc when used)

Relief Valve

Domestic

Hot Water

System Return

Top view of BS Tank

SHEET

MONITOR PRODUCTS, INC.

THIS DRAWING IS FOR REFERENCE ONLY. IT

IS NOT INTENDED TO DESCRIBE A COMPLETE

SYSTEM. EACH SYSTEM SHOULD BE DE-

SIGNED BY A PROFESSIONAL.

SCALE

SIZE FSCM NO. DWG NO. REV

/DRAIN

VALVE

PURGE

BALL VALVE

3 Way Valve

(Kit # 9523)

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APPENDIX A

SHEET

Air Handler

System

MZ Heating

3 Way Valve

(Kit # 9523)

System Supply

(recirc when used)

Relief Valve

Domestic

Hot Water

System Return

Top view of BS Tank

BS Tank

MONITOR PRODUCTS, INC.

THIS DRAWING IS FOR REFERENCE ONLY. IT

IS NOT INTENDED TO DESCRIBE A COMPLETE

SYSTEM. EACH SYSTEM SHOULD BE DE-

SIGNED BY A PROFESSIONAL.

SCALE

SIZE FSCM NO. DWG NO. REV

/DRAIN

PURGE

VALVE

BALL VALVE

SHEET

Zone 1

Air Vent (TYP)

Zone 3

Relief Valve

(recirc when used)

System Return

System Supply

Domestic Hot Water

Top view of BS Tank

MZ INSTALLATION & MAINTENANCE

Zone 2

Zone Valve (TYP)

BS Tank

MZ Heating

System

Expansion Tank & Air Separator (May be Required due to System Capacity)

MONITOR PRODUCTS, INC.

THIS DRAWING IS FOR REFERENCE ONLY. IT

IS NOT INTENDED TO DESCRIBE A COMPLETE

SYSTEM. EACH SYSTEM SHOULD BE DE-

SIGNED BY A PROFESSIONAL.

SCALE

SIZE FSCM NO. DWG NO. REV

/DRAIN

VALVE

PURGE

BALL VALVE

APPENDIX A

3 Way Valve

Storage Tank

Chiller

Zone 2

Radiant Heat or other

Low Temp Heat

MZ Heating

System

BS Tank

Heating System Supply

Heat Exchanger for Pool Heat or Snow Melt

SHEET

MONITOR PRODUCTS, INC.

THIS DRAWING IS FOR REFERENCE ONLY. IT

IS NOT INTENDED TO DESCRIBE A COMPLETE

SYSTEM. EACH SYSTEM SHOULD BE DE-

SIGNED BY A PROFESSIONAL.

SCALE

SIZE FSCM NO. DWG NO. REV

/DRAIN

PURGE

VALVE

BALL VALVE

TWO-TEMP SYSTEM WITH SINGLE HIGH-TEMP CALL. FOR USE WHEN TOTAL, DESIGN SPACE-HEAT LOAD IS GREATER THAN 80% OF SYSTEM OUTPUT. MZ systens used in high-temp, low-temp system with high-temp being “piggybacked” through the priority function of MPI’s DHW kit. This arrangement uses an indirect DHW tank as a buffer.

A 3-way valve* B low-temp radiant C Anti-scald mix valve** on outlet of

DHW tank set at 120 F. max.

D DHW out E cold potable in

The high-temp zone’s thermostat is two stage. Stage 1 activates zone valve. The valve’s end switch brings on the pump, G. The second stage is wired in parallel with the aquastat in the tank and brings on the MZ’s burner if needed.

Control for the low-temp zones B can be whatever would otherwise be used, including outdoor reset. Constant circulation recommended.

When there is a high-temp zone call the pump will circulate water from the tank’s heat exchanger through the zone until the call is satisfied. The tank acts as a buffer. As the tank’s temp falls, the stat’s second stage brings heating system on.

This arrangement prevents tank overheating at times when no high-temp zone call is needed. The indirect tank aquastat should be set at whatever temp would be normal for that family’s use. 110 to 120 F. is normal. The thermostatic mix valve C MUST always be used to prevent scalding.

There is no conflict between simultaneous DHW and high-temp zone use because high-temp zone call is above the mix temp of C. Simultaneous use will lengthen the time the MZ will run to satisfy, but will not interfere with comfort.

If there is a large hot tub or multiple high-flow shower heads, additional DHW storage or more heating system BTUs would be needed in any case. High-temp design must be at 170 F. or less. If higher temps required, contact MPI. There is no flow conflict between the high-temp zone and the MZ when both priority (DHW / high-temp) circuits are calling at the same time. The flows are “coupled” only through the indirect tank’s heat exchanger. Flow rates will change depending on whether one or both are calling, but each circuit will be free to perform its function without interference.

* included in MPI’s DHW kit, part # 9523 ** MPI part # 9075

Note that this is not a design for a specific job. It is a schematic representation of fluid flow patterns suitable for some combined low / high temperature hydronic systems. It shows one way of solving one of the design challenges normal to combining low and high temperature requirements in hydroninc heating. This drawing is for reference only. It is not intended to describe a complete system. Each system should be designed by a professional.

F BS or other indirect tank G high-temp zone pump H zone valve for high-temp zone I monoflow tee ensures flow

cooperation between DHW and hightemp heat

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APPENDIX A

A 3-way valve, part of MPI’s DHW kit, part# 9523. When the aquastat in the DHW storage tank (B) calls for heat, the 3-way valve in the MZ will switch to the DHW position

and the MZ will fire and run until the aquastat is satisfied. When the DHW call is finished the 3-way valve moves to the space-heat position.

B DHW storage tank. (MPI BS tank. 25, 40, 50 or 80 gal.) C Balancing valve. D Thermostatic modulating zone valve. E Master zone containing thermostat. F Street or well water in. G Potable DHW out. H DHW re-circ pipe in BS tank for optional re-circ loop.

Note that there should be a properly-anticipated standard thermostat in zone M. (Call this the “master” or “reference” zone. It controls supply-water temperature automatically.) When the summer-winter switch on the MZ’s control panel is in the winter mode, the 85-watt pump in the MZ will circulate constantly, feeding either the space-heat zones or the DHW call. When the switch is in the summer mode, the MZ will only respond to a DHW call.

The thermostat automatically modulates the supply water temperature in the winter mode. The slave zone will always see system-water flow at the temperature determined by the stat in the master zone. The slave zone, controlled by D, can be set back cooler than the master zone. To increase temperature in the slave zone, use a balancing valve to reduce flow to the master zone gradually.

For maximum efficiency, reduce flow through the MZ as much as possible to the point where the flow switch in the MZ is no longer satisfied or where comfort in very cold weather is compromised because the MZ is trying to make heat, but is cycling on its adjustable high-limit control.

Note that reducing flow through the MZ means that the last foot of baseboard in a long run can be much cooler than the first foot when the burner is on for a long time. If baseboard runs through several rooms in secession, the baseboard should be sized carefully. The MZ can operate at a 50 deg. F. delta T. between return and supply. That’s great for efficiency, but does mean that baseboard sizing has to be done right.

Contact MPI for more information. There are many ways of getting great efficiency and comfort.

NOTE: This schematic is a generic example of a concept, not a system design. The person using this concept in any design must take full responsibility for the function of the system. Each system will be different. This drawing does not show numerous details required for good practice and local code compliance. Please contact MPI for more information if necessary.

25C

MZ VENTING USING

CHASE FOR INLET AIR.

Flue gas out.

MZ INSTALLATION & MAINTENANCE

Fresh air intake

Cap.

Existing chase (for instance,

chimney, after cleaning)used for

flue and intake-air runs.

Continuous 3" PVC run for

intake-air is preferred,

especially if very clean chase

cannot be assured. DO NOT

USE CHLORINATED

CLEANERS FOR CHASE

CLEANING!!!

All pipe 3" PVC. Connect to

MPI’s accessory #9530 A,

separated vent kit.

Combustion-air to MZ

Flue gas from MZ

APPENDIX A

heating system then supplies

Note: In the MZ 25S the wiring harness 27 and the aquastat 6 are installed in

the MZ factory. For an MZ25C using MPI’s DHW kit, part #9523, the additional

aquastat that ships with the wiring harness 27 and 3-way valve 7 must be field

installed inside the MZ and wired in series between 10 and 11.

Component Key [MPI Part Numbers]

1) Line (120 V.)

2) Ground

3) Neutral (common)

4) On-off switch

5) Summer (S) winter (W) switch

6) Field-supplied external close-on-fall switch for DHW or other priority call

7) Three-way value [Part of DHW kit 9523

8) Adjustable aquestat for system-water temperature control

9a) Thermostat location for control of pump and burner simultaneously.

9b) Thermostat location for control of burner. Pump runs continuously

10) Manual-reset flue-gas limit [9051]

11) Manual-reset supply-water limits [9023]

12) Air proving switch [9073]

13) DHW relay [9001]

14) Water pump [9006]

15) Combustion-air fan [9019]

16) Water-flow proving switch [9039]

17) Gas valve [9005]

18) Ignition transformer [9020]

19) Fan relay [9001]

20) Ignition module [9016]

25) Flame-proving rod [9003]

27) Wiring harness for priority control [Part of DHW kit: 9523]

Senior

(Burner) Ground

24 V. Ground

24 V. Valve (GND) Valve

gray

432

blbbl

MZ 25C - 25S Wiring Diagram

9B 9A

Water Flow

g w

Switch

g w

DHW

Relay

Pump

Relay

Fan

Relay

gray

123

brr

Air

Proving

Switch

n L

Pump

gray

Lead Gas

Valve

Fan

41) Water-pump relay [9001]

42) 120/24 V. Transformer [9043]

Sequence of Operation: Space-Heat Call

On-off switch 4: on. Summer-winter switch 5 (SWS): winter. 24v @ T1 through

SWS. 24v @ T2 brings on pump 14. 24 @ T3 goes through adjustable supply-

water aquastat 8, water limit 11, to flue limit 10 air-proving switch is closed, 24v

closes fan relay 19. At air-proving switch 12 close, 24v at ignition module 20

initiates combustion by powering gas valve 17 while powering spark through

ignition transformer 18. At four-seconds into ignition sequence, flame-proving

is checked through proving rod 25. If flame is proved,

heat until call for heat or DHW is satisfied. If leaving-water temperature exceeds

setting on aquastat 8 burner will shut off until supply-water temperature falls

below its setting until the call for heat has been satisfied.

gray

Summer

Transformer

120

Off

Winter

Switch

w g

gray

n L

120 V. 60 HZ

Sequence of Operation: Priority (DHW) Call

On-off switch on. Switch 6 closes on fall, brining 24v to relay 13 which calls for

pump through relay 41 and initiates ignition sequence, bypassing stage one of

aquastat 8. Call for heat is thus available through wiring harness 27 whether of

not unit is in between 10 and 11 to protect manual-reset supply-water limit 11

from nuisance trip.

Wire color-code: mote arrows signify return to ground green and neutral (white).

b = black bl = blue br = brown g = green gr = gray

L = line n = nueteral o = orange r = red w = white

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APPENDIX A

WIRING DIAGRAM FOR FULL OUTPUT CONTROL OF MZ2040C FOR PRIORITY CALL WHEN ADJUSTABLE-LIMIT SWITCH IS AT LOW-TEMP SETTING.

4 3 2 1

2 3

gray

1 2 3

WATER FLOW SWITCH

44 LAG VALVE RELAY

362

RELAY

VALVE

24 V.

VALVE (GND)

gray

ROUND

24 V. G

GROUND

(BURNER)

PUMP

n L

g w

1 2

PUMP RELAY

gray

TRANSFORMER

1 2 0 V

AIR PROVING SWITCH

LEAD GAS VALVE

DHW RELAY

br br

gray

2 4

FAN

223

3 1

g w

FAN RELAY

OFF SWITCH

w g

n L

120 V. 60 HZ

gray

ENIOR

gray

LAG GAS VALVE

gray

Summer

Winter

gray

362

4 3 2 1

Wire color-code: mote arrows signify return to ground green and neutral (white). b = black bl = blue br = brown g = green gr = gray L = line n = nueteral o = orange r = red w = white

Note that the additional relay to bring full output to a priority call is field installed. Note that the grey and black wires used to power the additional relay are also used to power the 3-way valve when MPI’s 3-way valve kit, part # 9523, is used for prioritizing. If prioritizing is done through a pump-control switching box, use MPI part # 9518, wiring harness, item #27 in this drawing, to connect the MZ to the additional relay and priority-controller end switch.

Note that the relay shown is available from MPI as our part # 9001. The use of the transformer in the MZ to power other relays or other controls is not recommended.

MZ INSTALLATION & MAINTENANCE

VI I. APPENDIX B

APPENDIX B

PARTS:

The MZ is an exceptionally well-built device. All of the components selected for the MZ are the most reliable available. No matter how well built and reliable a product is, parts are inevitably needed. We are committed to making parts readily available for the MZ through your distributor, even though they should seldom be needed.

REQUIRED PARTS LIST

PART# 9016 IGNITION MODULE PART# 9020 IGNITION TRANSFORMER PART# 9043 TRANSFORMER PART# 9019 FAN PART# 9015 FLOW SWITCH FOR 25 SERIES PART# 9039 FLOW SWITCH FOR 40 SERIES PART# 9007 ADJUSTABLE LIMIT SWITCH PART# 9011 RELIEF VALVE PART# 9005 GAS VALVE

The following parts are specific to the MZ25S: PART# 9008 DHW AQUASTAT PART# 9018 THREE-WAY VALVE OPERATOR

Full stock of the remainder of the parts for the MZ line is available from the source of your MZ.

CONTROL PANEL MZ25C/S

ITEM

1 Reference Only FRONT COVER & STICKER

2 9055 ON/OFF SWITCH

3 Reference Only SUMMER/WINTER SWITCH

4 9051F THERMOSTAT GAUGE FAHRENHEIT)

5 9053 KNOB

6 9007 SYSTEM THERMOSTAT 20-80º C

7 Reference Only ZINC DISC D 4XX10X0,8

8 Reference Only WIRE ROPE CLAMP

9 Reference Only FOLDED NECK FOR WIRES

10 Reference Only COVER FOR CONTROL BOX

PART

NUMBER

DESCRIPTION

ITEM

PART

NUMBER

11 9001 RELAY, 24V COIL

12 Reference Only RELAY CARRIER & STIRRUP

13 Reference Only FOLDED RELAY HOLDER

14 Reference Only WHITE CONTROL BOX

15 9061 CLIP

16 9043 TRANSFORMER 120 TO 24 VOLTS

17 9070 CONTROL BOX

* Reference Only SAFETY BOX WIRED

* 9017 CONTROL PANEL INCLUDING WIRING

*NOT SHOWN ON DRAWING

DESCRIPTION

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APPENDIX B

MZ25C

MZ INSTALLATION & MAINTENANCE

APPENDIX B

ITEM# PART

NUMBER

1 9065 DRAIN VALVE WITH CAP

2 9056 STRAINER

3 9078 RETURN-WATER MANIFOLD GASKET

4 9056 NEOPRENE STICKING SEALING

5 9093 RETURN/SUPPLY MANIFOLD, MZC

6 9042 O RING FOR DERATE ORIFICE

7 9006 CIRCULATING PUMP 15/42F 115V

8 9096 NEEDLE VALVE O-RING

9 9095 BYPASS NEEDLE VALVE

10 9094 BYPASS PLUG

11 9010 AUTOMATIC AIR VENT

12 9015 FLOW SWITCH

13 For Reference Only SPRING FOR SYSTEM COVER

14 Part of LP Kit 9085 UNION REDUCER D 3.5 (GP)

14 9130 UNION REDUCER 5.4 (GN)

15 For Reference Only SAFETY VALVE DISCHARGE PIPE

16 9098 RETURN TO HX PIPE

16 9090 WELDED INLET TO SUMP

17 For Reference Only EXTENSIBLE SEALING EXT. 40

18 9019 FAN (OR #W00. 17073)

19 9099 RETURN TO HX PIPE GASKET

20 For Reference Only SLEEVE BURNER/VALVE 2 PARTS

21 For Reference Only NITRILE O-RING D 38 3.70 SHORE

22 For Reference Only COLORLESS PLASTIC CAP

23 9097 FLOW SWITCH GASKET

24 9534 WALL BRACKET

25 9210 CABINET MZ25C

26 9020 IGNITION TRANSFORMER

27 For Reference Only BACK STOP PLATE FOR MZ

28 For Reference Only FIXING SYSTEM FOR FLUE PIPE

29 For Reference Only EXTENSIBLE SEALING;

30 For Reference Only REDUCED FLUE OUTLET PIPE,

31 9021 AIR PRESSURE SWITCH

DESCRIPTION

FLANGE

HEAT EXCHANGER

INTERNAL 25

TO CLIP

(3355X80 4X1.5)

EXT40-INTERN, 14

F75/M80 L360

ITEM# PART

NUMBER

32 9533 ELBOW D.80 45º

33 9003 FLAME PROBE

34 9022 BURNER HEAD

35 9004 IGNITOR

36 For Reference Only AIR REDUCER D.29 (GN)

36 Part of LP Kit 9085 AIR REDUCTION RING D.31 (GP)

37 For Reference Only REMOVABLE PROTECTION FOR

38 For Reference Only GLASS BRAID RING D 12 LG 685

39 9023 SYSTEM LIMIT

40 9532 90º ELBOW D 80 WITH SENSOR

41 9024 FLUE LIMIT 76º C

42 9060 SIGHT GLASS RETAINER

43 9059 SIGHT GLASS GASKET

44 9058 SIGHT GLASS

45 9014 SYSTEM HEAT EXCHANGER

47 9069 PRESSURE RELIEF VALVE

48 2365 FLEXIBLE PIPE/SIPHON OUTLET

49 9017 CONTROL PANEL INCLUDING WIRING

50 9066 NUT

51 For Reference Only FLANGE COCK & EXPANSION

52 For Reference Only STAINLESS STEEL FLEXIBLE PIPE

53 For Reference Only SIGHT GLASS D 33X3

54 9080 GAS MANIFOLD CONNECTION NUT 25S

55 For Reference Only SEALING

56 9012 EXPANSION VESSEL (8 LITERS)

57 For Reference Only GAS SUPPLY

58 9005 GAS VALVE

59 For Reference Only NITRILE O-RING D.23 52X1, 78

60 For Reference Only BURNER GAS PIPE

61 For Reference Only WHITE DOOR FOR MZC 525 NOT

52 For Reference Only WHITE ABS DOOR HANDLE 90, 22,

63 9206 DOOR MZ25C

64 9207 WHITE COVER MZC: WHITE DOOR

65 For Reference Only NITRILE O-RING D.8X2 80 SHORE

DESCRIPTION

BURNER (580 X 30 X 1.5)

D.32 LENGTH 1300

VESSEL FOR THR

MALE, 1/4 WITH ELBOW

EQUIPPED

90,79, O B

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APPENDIX B

MZ25S

MZ INSTALLATION & MAINTENANCE

APPENDIX B

ITEM# PART

NUMBER

1 For Reference Only SPRING FOR SYSTEM COVER

2 For Reference Only EXTENSIBLE SEALING;

2 BOTTOM PANEL, MZ25S 40

3 9065 FILL/DRAIN VALVE WITH CAP

4 9056 STRAINER

5 9068 WASHER

6 For Reference Only HEATING FLOW/RETURN UNIT

7 For Reference Only NEOPRENE STICKING SEALING/

8 9096 NEEDLE VALVE O-RING

9 9095 BYPASS NEEDLE VALVE

10 9094 BYPASS PLUG

11 9010 AUTOMATIC AIR VENT

12 For Reference Only SEAL, AFM34 D

13 9069 SAFETY VALVE MF 1/2"

14 9006 CIRCULATING PUMP 15/42F 115V

15 9099 RETURN TO HX PIPE GASKET

16 9082 DHW LEAVING-WATER ELBOW 25S

17 9081 DWH FLOW-SET ELBOW 255

18 For Reference Only MESSING MF REDUCTION

19 9080 GAS MANIFOLD RETAINER NUT

20 9013 FLASH DOMESTIC HOT WATER

21 For Reference Only BRASS NIPPLE MALE 1/2 -

22 9535 WALL BRACKET

23 9212 CABINET MZ 25S

24 9008 DOMESTIC HOT WATER

25 9020 IGNITION TRANSFORMER

26 For Reference Only BACK STOP LATE FOR MZ

27 For Reference Only FIXING SYSTEM FOR FLUE PIPE

28 9533 ELBOW D.80 45º

29 9097 FLOW SWITCH GASKET

31 9021 AIR PRESSURE SWITCH

32 9003 FLAME PROBE

33 9004 IGNITOR

34 9022 BURNER HEAD

35 9092 RETURN/SUPPLY HEAT EXCHANGE

36 For Reference Only AIR REDUCER D29

36 9129 AIR REDUCTION RING D.31

37 Part of LP Kit 9084 SLEEVE BURNER/VALVE 2 PARTS

DESCRIPTION

EXT40-INTERN 14

FLANGE

CYLINDER

MALE 3/4 LONG

THERMOSTAT

O-RING

TO CLIP

ITEM# PART

NUMBER

38 For Reference Only NITRILE O-RING

39 9019 FAN (OR #W00. 17073)

40 For Reference Only EXTENSIBLE SEALING EXT. .40

41 For Reference Only GALVANIZED CAST IRON BEND

42 9009 3 WAY SELECTOR VALVE SHELL

43 For Reference Only HEATING FLOW MZS

44 9015 FLOW SWITCH

45 For Reference Only WELDED INLET TO PUMP

46 9094 BYPASS PLUG

48 9018 SELECTOR VALVE MOTOR

49 2365 FLEXIBLE PIPE/SIPHON OUTLET

50 9057 CONDENSATE TRAP

51 For Reference Only GLASS BRAID RING D12 LG 685

52 9023 SYSTEM LIMIT

53 9014 HEAT EXCHANGER MZ25C / MZ25S

54 9024 ELMWOOD SAFETY THERMOSTAT

55 9532 90º ELBOW D80 WITH SENSOR

56 9060 SIGHT GLASS RETAINER

57 9059 SIGHT GLASS GASKET

58 9058 SIGHT GLASS

59 9017 CONTROL BOX

60 For Reference Only UNION REDUCER D 3.5

60 For Reference Only UNION REDUCER 5.4

61 For Reference Only NIRILE O-RING D 8X2 80 SHORE

62 For Reference Only BURNER GAS PIPE

63 For Reference Only NIRILE O-RING D 23.52 X 1.78

64 9005 GAS VALVE

65 For Reference Only GAS SUPPLY

66 9012 EXPANSION VESSEL (8 LITERS)

67 For Reference Only STAINLESS STEEL FLEXIBLE PIPE

68 For Reference Only SIGHT GLASS D 33X3

69 9066 NUT

70 For Reference Only FLANGE COCK & EXPANSION

71 For Reference Only COVER MZS: WHITE

72 For Reference Only WHITE DOOR MZS/THRS NOT

73 For Reference Only WHITE ABS DOOR HANDLE 50, 22,

74 9200 DOOR MZ40

DESCRIPTION

INTERN 25

D32 LENGTH 1300

85º W/ MANUAL RESET

MAL 1/4 WITH ELBOW

VESSEL FOR THR

EQUIPPED

90, 79, 0B

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APPENDIX B

MZ INSTALLATION & MAINTENANCE

MZ25S

APPENDIX B

ITEM# PART

NUMBER

1 For Reference Only BURNER GAS PIPE

2 For Reference Only FIXING BRACKET FOR IONIZATION

3 9005 GAS VALVE

4 For Reference Only FIXING BRACKET FOR BURNER

5 9024 FLUE LIMIT 76º C.

6 9058 CONDENSATE TRAP

7 9059 SIGHT GLASS

8 9060 SIGHT GLASS RETAINER

9 For Reference Only GAS SUPPLY

10 For Reference Only NON-RETURN VALVE

11 9011 SAFETY VALVE MF 1/2"

12 9012 EXPANSION TANK

13 For Reference Only FLEXIBLE PIPE/SIPHON

14 9057 STRAINER

15 For Reference Only DRAIN VALVE WITH

16 9025 CONNECTING TUBE

17 9068/9078 WASHER

18 9056 STRAINER

19 For Reference Only HEATING FLOW/RETURN UNIT

DESCRIPTION

PROBE

MZTHR

OUTLET D 32 LENGTH 1300

CAP M 1/2 - M 3/4

(EXPANSION TANK)

ITEM# PART

NUMBER

20 For Reference Only CIRCULATING PUMP 15/42F 115V

21 For Reference Only FIXING BRACKET/TURBINE

22 For Reference Only VERSILIC 6X10 LG 300 MM

23 For Reference Only JOINT BRIDGE CIRCULATOR UPS

24 For Reference Only FIXING U-PART FOR THE TURBINE

25 9084 LP CONVERSION KIT MZ40

26 9019 FAN (OR #W00. 17073)

27 For Reference Only SLEEVE BURN/VALVE 2

28 For Reference Only JOINT TORQUE NITRILE

29 For Reference Only SYSTEM SHELL

30 9098 RETURN TO HX PIPE

31 9099 RETURN TO HX PIPE GASKET

32 For Reference Only GLASS BRAID RING D 12 LG 685

33 9023 SYSTEM LIMIT

34 9022 BURNER HEAD

35 9004 IGNITOR

36 For Reference Only ADAPTER D. 4-D 6.35

37 9003 FLAME PROBE

38 For Reference Only HEATING FLOW BEND

DESCRIPTION

15-42 F D.55 EP.5

PARTS TO CLIP

REF: CABGEM02 (MZ USA)

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APPENDIX B

MZ INSTALLATION & MAINTENANCE

MZ40C

APPENDIX B

ITEM# PART

NUMBER

1 9091 FILTER FILL AND DRAIN A55Y

2 9065 DRAIN VALVE WITH CAP M1/2-,3/4"

3 For Reference Only MESSING REDUCER CB 1 1/2 -

4 9066 NUT

5 9056 STRAINER

6 9078 RETURN WATER MANIFOLD

7 For Reference Only NEOPRENE STICKING SEALING/

8 9096 NEEDLE VALVE O-RING

9 9095 BYPASS NEEDLE VALVE

10 9094 BYPASS PLUG

11 9010 AUTOMATIC AIR VENT

12 9015 FLOW SWITCH

13 For Reference Only INLET/OUTLET HEATING UNIT

14 9092 RETURN/SUPPLY HEAT

15 9006 CIRCULATING PUMP 15/42F 115V

16 For Reference Only SPRING FOR SYSTEM COVER

17 9090 SAFETY VALVE DISCHARGE PIPE

18 9098 RETURN TO HX PIPE

19 For Reference Only WHITE DOOR MSZ/THRS NOT

20 9099 RETURN TO HX PIPE GASKET

21 9019 FAN (OR #W00 17073)

22 For Reference Only COLORLESS PLASTIC CAP

23 For Reference Only WHITE ABS DOOR HANDLE 90, 72,

24 For Reference Only EXTENSIBLE SEALING EXT. 40

25 9535 WALL BRACKET

26 9205 CABINET, MZ40

27 9020 IGNITION TRANSFORMER

28 For Reference Only BACK STOP PLATE FOR MZ

29 For Reference Only FIXING SYSTEM FOR FLUE PIPE

30 9200 DOOR MZ40

31 For Reference Only REDUCED FLUE OUTLET PIPE

32 9073 AIR PRESSURE SWITCH 40C

33 For Reference Only ELBOW D. 80 45º

34 9003 FLAME PROBE

35 9004 IGNITOR

36 9023 SYSTEM LIMIT

37 For Reference Only NITRILE O-RING D.38X3.70 SHORE

38 For Reference Only NITRILE O-RING D 8X2 80 SHORE

39 For Reference Only UNION REDUCER D12 D 4.20 (GP)

40 9074 BURNER FOR MZ40C

41 For Reference Only SLEEVE BURNER/VALVE 2 PARTS

DESCRIPTION

FEMALE 1/2

GASKET

FLANGE

EXCHANGE O-RING

EQUIPPED

90, 79, OB

INTERN 25

TO CLIP

ITEM# PART

NUMBER

42 9093 RETURNS/SUPPLY MANIFOLD, MZC

43 For Reference Only TINNED GAS PIPE NOZ

44 For Reference Only MESSING M/F REDUCTION

45 For Reference Only 90 ELBOW D. 80 WITH SENSOR

46 For Reference Only GLASS BRAID RIND D. 12 LG 1070

47 For Reference Only ELMWOOD SAFETY THERMOSTAT

48 9005 GAS VALVE

49 For Reference Only NITRILE O-RING D. 23, 52X 1.78

50 For Reference Only HONEYWELL VALVE FLANGE

51 9097 FLOW SWITCH GASKET

52 For Reference Only SIGHT GLASS D. 33X3

53 9060 SIGHT GLASS RETAINER

54 9059 SIGHT GLASS GASKET

55 9058 SIGHT GLASS

56 9087 MZ40C HEAT EXCHANGE

57 9080 DWH CONNECTION NUT 255

58 For Reference Only GAS RAMP M40

59 9057 CONDENSATE TRAP

60 9104 CONTROL PANEL INCLUDED

61 9011 SAFETY VALVE MF 1/2"

62 For Reference Only FLEXIBLE PIPE/SIPHON OUTLET

63 For Reference Only COVER MZC 30/40 WHITE

* For Reference Only WIRE CARRIER

* 9002 O-RING (FLUE OUTLET)

* For Reference Only EPOM STICKING SEAL PIPE 6/9

* For Reference Only EXTENSIBLE SEALING, EXT. 40-

* 9101 GASKET FOR 70 MM HORIZONTAL

* For Reference Only FLUE TEMPERATURE ALU

* For Reference Only FIXING BRACKET FOR BURNER

* For Reference Only VERSILIC PIPE 6X10 LENGTH 800 MM

* For Reference Only GAS BEND

* For Reference Only HEATING FLOW BEND

* For Reference Only HEATING RETURN BEND

* 9087 LP CONVERSION KIT MZ40

* 9077 COMBINATION RESET SWITCH

* For Reference Only FIXING BRACKET FOR

* For Reference Only IGNITION ANGLE WITH SCREW

* *NOT SHOWN ON DRAWING

DESCRIPTION

85º W/ MR

WIRING

D. 32 LENGTH 1300

LENGTH 18

INTERN 14

FLUE PIPE

MEASURE SENSOR

MZ/THR

ASSEMBLY

IONIZATION PROBE

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APPENDIX B

ITEM# PAR T

NUMBER

1 For Reference Only FRONT COVER & STICKER 2 9055 ON/OFF SWITCH 3 9054 SUMMER/WINTER SWITCH 4 9051F THERMOSTAT GAUGE (FAHRENHEIT) 5 9053 KNOB 6 9052 ADJUSTABLE LIMIT 40 7 For Reference Only ZINC DISC D 4XX10X0.8 8 For Reference Only WIRE ROPE CLAMP 9 For Reference Only FOLDED NECK FOR WIRES 10 For Reference Only COVER FOR CONTROL BOX 11 9001 RELAY MY4-24V 12 For Reference Only RELAY CARRIER & STIRRUP 13 9040 120V RELAY 14 For Reference Only FOLDED HOLDER/RELAY 15 For Reference Only WHITE CONTROL BOX 16 9061 CLIP 17 9043 TRANSFORMER 120 TO 24VOLTS 18 9016 CONTROL BOX * For Reference Only WIRING * 9104 CONTROL PANEL INCLUDED WIRING

DESCRIPTION

MZ40C

BS 25/40/50/80

ITEM# PAR T

NUMBER 1 For Reference Only Grey Ps Cleaning Door 2 For Reference Only Anode & Cap & Sealing 3/4d.22.230 magnesium 3 For Reference Only Flange for cleaning door 4 For Reference Only Sealing AFM34 D.36x26x2 5 For Reference Only Sealing/Cleaning Door 6 For Reference Only Anode Cleaning Door 7 9400 Upper Bottom & Cable BS 8 For Reference Only Jaeger Tuaa5C112 Jaeger Thermostat 9 For Reference Only Black Cap for the Thermostat 10 For Reference Only Black Thermostat Knob 11 For Reference Only Thermostat Rect Horiz 69x14 LG Capil 1500 MM 12 For Reference Only Thermoformed 13 For Reference Only Stainless Steel Bend 90 Degree M3/4-F3/4 14 For Reference Only Domestic Cold Water Pipe Length 310 15 For Reference Only Plug Wieland 5 PT. Male 16 For Reference Only Plug Wieland 5 PT. Female 17 For Reference Only Fixing Piece 18 For Reference Only ABS Sheet; Ep:08 1935x440 BS100 18 For Reference Only ABS Sheet: EP: 081935x665 BS150 18 For Reference Only ABS Sheet; EP: 08 1935x890 BS200 18 9401 ABS Sheet; EP: 081935x1340 BS300 * For Reference Only NBS Superior Bottom Equipped * For Reference Only Wiring

DESCRIPTION

MZ INSTALLATION & MAINTENANCE

NOTES

MONITOR PRODUCTS, INC.

P.O. Box 3408 • Princeton, NJ 08543

www.monitorproducts.com

PHONE (732) 329-0900 • FAX (732) 329-0904

MPI offers technical support to qualified licensed heating contractors during normal business hours. (Monday-Friday 8:30

A.M. to 4:30 P.M. Eastern Time)

To help us serve you properly our technicians will require the following information:

Fuel Type (Natural/Propane)

Gas pressure in In. W.C. (Inlet and outlet with all appliances running)

CO reading in PPM O 2 reading in %

Flue Outlet Temperature °F

Water Outlet temperature °F Water Return temperature °F

System load: Radiant, high temperature, DHW. Total BTU requirement

Input Voltage

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WARRANTIES

VIII - MONITOR PRODUCTS, INC. (“MPI”) LIMITED WARRANTIES

First year-MPI warrants that each MZ Series Heating Systems sold by it to be free from defects in material and workmanship, under normal use and services, for a period of 1 year after date of purchase with an additional period of up to 3 months if unit is not installed at the time of purchase.

First through tenth year-MPI warrants that the primary heat exchanger assembly consisting of water-tube heat exchanger, water jacket and condensate collector is free from defects in material and workmanship for 10 years from the date of purchase.

MPI corrosion inhibitor must be used in every MZ series heating system. Failure to use this inhibitor will void this warranty.

NOTE: We will not accept any MZ heat exchangers for warranty consideration without an 8 ounce water sample from the system. This is required to test for the proper inhibitors. No credit will be issued

without a water sample.

STANDARD PROVISIONS, TERMS AND CONDITIONS THAT ARE COMMON TO ALL MPI INDIVIDUAL PRODUCT WARRANTIES:

These warranties are subject to the condition that the MPI product(s) must have been installed in accordance with manufacturer’s instructions. These warranties extend only to the first retail purchaser of the products and only to a product that has not been moved from its original installation site. These warranties do not apply to commercial applications.

In addition to each product warranty listed, MPI warranties do not cover:

1) Components that are part of the heating system but were not furnished by MPI as part of the heating system.

2) The workmanship of any installer of MPI’s product(s). In addition, this warranty does not assume any liability of any nature for unsatisfactory performance caused by improper installation.

3) Any costs for labor for removal and reinstallation of the alleged defective part, the cost of shipping or transportation to MPI and back to the consumer, if necessary, and any other materials necessary to perform the exchange.

4) Replacement parts beyond the balance of the original warranty period.

REMEDY: If within the applicable warranty period, any pro-

duct(s) or part(s) included in this warranty proves to be defective in material and/or workmanship, then MPI shall repair or replace, at its option, the defective product(s) or part(s) and return it to the consumer.

PROCEDURE FOR OBTAINING PERFORMANCE UNDER THIS WARRANTY: In order to obtain performance under this

warranty, the original purchaser must promptly (in no event later than thirty (30) days after discovery of the defect) see to the return of the product(s) or part(s) in question, accompanied by a properly filled out MPI warranty claim form (Available from MPI by mail or phone). Any claim made under this warranty must be accompanied by proof of original purchase date, sales invoice or cancelled check showing the serial number as satisfactory evidence. Any replacements are made subject to validation by MPI of in-warranty coverage. An item to be replaced must be made available in exchange for the replacement.

SOLE REMEDY: The remedy and liability for any breach of warranty, express or implied, set forth herein is the sole and exclusive remedy and the limit of liability for any such breach.

EXCLUSIONS AND IMPLIED WARRANTIES: This warranty does not extend to any defect due to the negligence of others. Failure to install, operate or maintain the product(s) in accordance with the installation, operation and maintenance instructions furnished with each new product, unreasonable use, accidents, acts of god, fire, snow, floods, lightning, alteration, ordinary wear and tear, or the use of unauthorized or non-standard parts.

ALL IMPLIED WARRANTIES, IF ANY, ARISING UNDER LAW IN CONNECTION WITH THE SALES BY MPI OF ANY PRODUCT(S) ARE LIMITED IN EXTENT AND DURATION TO THE DURATION OF THIS WRITTEN WARRANTY. THERE ARE NO WARRANTIES, EXPRESS OR IMPLIED, OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OTHER THAN AS EXPRESSLY STATED HEREIN. MPI SHALL NOT BE RESPONSIBLE FOR ANY INCIDENTAL, INDIRECT, PUNITIVE, OR CONSEQUENTIAL DAMAGES WHETHER AS A RESULT OF BREACH OF WARRANTY, NEGLIGENCE, STRICT LIABILITY IN TORT OR OTHERWISE.

Note: Some jurisdictions do not allow: (a) limitations on how long an implied warranty lasts; or (b) the exclusion or limitation of incidental, indirect, punitive or consequential damages, so the above limitations or exclusions may not apply to you.

NO VARIATION OF TERMS: the parties intend that this warranty be the exclusive and final expression of their agreement.

No person has the authority to orally, in writing or in any other

way vary the terms, conditions or exclusions of this warranty, or to make any express warranties other than those contained herein.

LEGAL RIGHTS: This warranty gives you specific legal rights and you may also have other rights which vary from jurisdiction to jurisdiction.

MZ INSTALLATION & MAINTENANCE

Monitor MZ, MZ25S, MZ25C, MZ40C Maintance Manual

Specifications and Main Features

Frequently Asked Questions

User Manual