PARTS LIST:
SEE BACK PAGE FOR PARTS ORDERING INFORMATION
REF #.
DESCRIPTION
1................. CIRCUIT BOARD .................................................... 60105 ......................1 ....................................S/A .......................1
2................. LIMIT SENSOR ....................................................... 60022 ......................1 ....................................60021 ...................2
3................. ELECTRODE IGNITER ............................................. 60139 ......................1 ....................................S/A .......................1
4................. ELECTRODE SENSOR ............................................. 60141 ......................1 ....................................S/A .......................1
5................. BURNER ................................................................ 60155 ......................3 ....................................60191 ...................5
6................. IGNITION LEAD ..................................................... 60045 ......................1 ....................................S/A .......................1
7................. SENSOR LEAD ....................................................... 60046 ......................1 ....................................S/A .......................1
8................. ORIFICE (NAT) ....................................................... 60049 ......................3 ....................................S/A .......................5
9................. ORIFICE (LP) .......................................................... 60156 ......................3 ....................................S/A .......................5
10............... GAS VALVE (NAT) ................................................. 60128 ......................1 ....................................S/A .......................1
11............... GAS VALVE (LP) .................................................... 60129 ......................1 ....................................S/A .......................1
12............... TRANSFORMER ..................................................... 60025 ......................1 ....................................S/A .......................1
13............... PRESSURE SWITCH ................................................ 60147 ......................1 ....................................60146 ...................1
14............... HI LIMIT SENSOR HEAT EXCH. .............................. 60015 ......................1 ....................................S/A .......................1
15............... PRESSURE SWITCH TUBE ....................................... 60031 ......................1 ....................................S/A .......................1
16............... INDUCED DRAFT MOTOR ...................................... 60020 ......................1 ....................................S/A .......................1
17............... VENT ADAPTER ..................................................... 60130 ......................1 ....................................60140 ...................1
18............... INDUCED DRAFT MOTOR GASKET ........................ 60157 ......................1 ....................................S/A .......................1
19............... BACK BRACKET .................................................... 60075 ......................1 ....................................S/A .......................1
20............... FRONT BRACKET .................................................. 60080 ......................1 ....................................S/A .......................1
21............... LOUVERS ............................................................. 60100 ......................5 ....................................S/A .......................7
22............... LOUVER SPRING ................................................... 60103 ......................5 ....................................S/A .......................7
23............... FLUE BOX .............................................................. 60189 ......................1 ....................................60190 ...................1
24............... FLUE BOX GASKET ................................................ 60090 ......................1 ....................................60092 ...................1
25............... HEAT EXCHANGER ................................................ 60065 ......................1 ....................................60068 ...................1
26............... ACCESS DOOR ..................................................... 60070 ......................1 ....................................60072 ...................1
27............... FRONT .................................................................. 60095 ......................1 ....................................60097 ...................1
28............... SIDE DOOR .......................................................... 60110 ......................1 ....................................60112 ...................1
29............... WRAPPER ............................................................. 60115 ......................3 ....................................60117 ...................3
30............... FAN MOTOR ......................................................... 60055 ......................1 ....................................60054 ...................1
31............... FAN GUARD ......................................................... 60120 ......................1 ....................................60122 ...................1
32............... FAN ASSEMBLY ..................................................... 60125 ......................1 ....................................60127 ...................1
33*............. CAPACITOR STARTER ....................................................................................................................28788 ...................1
34............... MANIFOLD ............................................................ 60062 ......................1 ....................................60064 ...................1
35............... INLET PIPE ............................................................. 60132 ......................1 ....................................S/A .......................1
36............... INLET FITTING ....................................................... 60131 ......................1 ....................................S/A .......................1
37............... BURNER SCREEN ................................................... 60142 ......................1 ....................................S/A .......................1
38............... THERMOSTAT TERMINAL ...................................... 60144 ......................1 ....................................S/A .......................1
39............... WIRING JUNCTION BOX ........................................ 60159 ......................1 ....................................S/A .......................1
40............... COVER, WIRING JUNCTION BOX ........................... 60160 ......................1 ....................................S/A .......................1
Not Shown . GAS VALVE BRACKET ............................................ 60158 ......................1 ....................................S/A .......................1
*Not Shown
Optional Installation Components
24V THERMOSTAT .................................................................................F210359
4" VERTICAL VENT KIT (80) ....................................................................F102848
3" VERTICAL VENT KIT (50) ....................................................................F102840
4" HORIZONTAL STAINLESS STEEL VENT KIT (50&80) ............................F102860
Gas Conversion Kits
Natural Gas to Liquid Propane
MHU 50/80
Liquid Propane to Natural Gas
MHU 50/80
50 ITEM #
50,000 and 80,000 BTU ....................................F260163
50,000 and 80,000 BTU ....................................F260164
Compact Unit / Utility Heater
QUANTITY
19
Operating Instructions and Owner's Manual
80 ITEM #
QUANTITY
Need help?
Do you have a question about the MHU 50 and is the answer not in the manual?
Questions and answers
I have a 50,000 btu unit but it doesn't seem to be putting out much heat at all. What could cause that problem?
A Mr. Heater MHU 50 unit may not produce much heat due to several possible reasons:
1. Gas Supply Issue – The gas valve may not be fully open, or there may be a problem with the gas supply, such as low pressure or an obstruction in the gas line.
2. Orifice Blockage – The gas orifice (part 8) could be clogged, restricting the fuel flow.
3. Ignition or Burner Problem – A faulty igniter electrode (part 3) or burner (part 5) could lead to incomplete combustion.
4. Sensor Malfunction – A defective electrode sensor (part 4) or limit sensor (part 2) may cause the unit to shut down or operate at reduced efficiency.
5. Gas Conversion Issue – If the unit was converted between natural gas and propane, an incorrect orifice or gas valve may have been installed.
6. Ventilation Problem – Poor venting can affect combustion, reducing heat output.
Checking and addressing these issues may restore proper heat output.
This answer is automatically generated