Monitor MZ Series - Quick Reference Information; Technical Specifications

4
MZ INSTALLATION & MAINTENANCE
T E C H N I C A L S P E C I F I C A T I O N S
MODEL
BTU input
AFUE Efficiency
Built-in Controls
& Functions
Dimensions
Weight
Vent Length
Fuel (see pg. 12)
MZ25C
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.
MZ40C
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.
MZ25S
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.
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)
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
NATURAL GAS
1075
30ppm / 9.5%
7.0"
87.9
132
1.14" / 29mm
None
0.228" / 5.8mm
None
2.8"
2.8"
1.57" IWC
.79" IWC
94,500
Two Stage
71,000 / 71,000 Each
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
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
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