MrHeater MH50KR Assembly instructions

MH50KR, MH75KTR,
MH125KTR, MH175KTR,
MH210KTR
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.
KEROSENE FORCED-AIR HEATER
2017
READ INSTRUCTIONS CAREFULLY:
800-251-0001

2
Mr. Heater, Inc. | Kerosene Forced Air Heater
CONTENTS
2
4
6
7
8
9
10
10
LANGUAGES
1-10
1-10
1-10
WARNING:
GENERAL HAZARD WARNING: WARNING:
WARNING:
WARNING:
WARNING:
The State of California requires the following warning:
WARNING:
CARBON MONOXIDE CAN KILL YOU
MH50KR & MH75KTR WARNING:
Not suitable for use on wood floors or other
combustible materials. When used the heater
should rest on a suitable insulating material at
least 1 inch thick and extending 3 feet or more
beyond the heater in all directions.

Mr. Heater, Inc.| Kerosene Forced Air Heater 3
Model 50KR 75KTR 125KTR 175KTR 210KTR
Burn Rate: 50,000 Btu/hr (14.7 kW) 75,000 Btu/hr (22 kW) 125,000 Btu/hr (37 kW) 175,000 Btu/hr (51 kW) 210,000 Btu/hr (61.5 kW)
Fuel Rate: 0.37 gal/hr (1.4 L/hr) 0.55 gal/hr (2.1 L/hr) 0.96 gal./hr (3.5 L/hr) 1.3 gal/hr (5.0 L/hr) 1.6 gal/hr (6.0 L/hr)
Electrical Input: 115V, 60Hz, 3.5a 115V, 60Hz, 4a 115V, 60Hz, 5.5a 115V, 60Hz, 5.5a 115V, 60Hz, 5.5a
Line Protection: 10 amps 10 amps 20 amps 20 amps 20 amps
Min. Operating Voltage: 110V 110V 110V 110V 110V
Pressure Setting: 3.5 psig (24 kPa) 4.2 psig (29 kPa) 5.1 psig (38 kPa) 6.8 psig (40 kPa) 8.2 psig (58.6 kPa)
Max. Outlet Temperature: 1450oF (787oC) 1450oF (787oC) 1450oF (787oC) 1450oF (787oC) 1450oF (787oC)
Fuel Tank Capacity: 4 gallons (15.1 L) 6 gallons (22.7 L) 8.45 gallons (32 L) 13.5 gallons (51 L) 13.5 gallons (51 L)
Ignition: Direct Spark, Continuous Direct Spark, Continuous Direct Spark, Continuous Direct Spark, Continuous Direct Spark, Continuous
Spark Generator: Igniter 13 kV, 10ma Igniter 13 kV, 10ma Igniter 13 kV, 10ma Igniter 13 kV, 10ma Igniter 13 kV, 10ma
Primary Safety Control: Solid State Control Solid State Control Solid State Control Solid State Control Solid State Control
SPECIFICATIONS
OPERATING PRECAUTIONS
SAFETY PRECAUTIONS
OPERATING INSTRUCTIONS
UNPACKING
ASSEMBLY
CAUTION: CSA certified for use with only No. 1-K kerosene fuel.
Factory Tested: Kerosene, Diesel #1 and #2, Fuel Oil #1 and #2, JP8 (Jet A Fuel)

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Mr. Heater, Inc. | Kerosene Forced Air Heater
MH125KTR, MH175KTR & MH210KTR) See page 7
MAINTENANCE AND STORAGE
WARNING.
ADJUSTING PUMP PRESSURE
Problem:
Adjustment:
PREPARING FOR OPERATION
IMPORTANT: Before filling fuel tank the first time or after ex-
tended storage periods, drain the fuel tank of any moisture
or condensation.
HEATER START UP
MH50KR:
MH75KTR, MH125KTR, MH175KTR & MH210KTR:
For all models:
HEATER SHUT DOWN
MH50KR:
MH75KTR, MH125KTR, MH175KTR & MH210KTR:
RESTART AFTER SAFETY SHUTDOWN MH50KR, MH75KTR,

Mr. Heater, Inc.| Kerosene Forced Air Heater 5
Problem:
Adjustment:
DAILY SCHEDULE
500 HOUR SCHEDULE
ANNUAL SCHEDULE
STORAGE
SERVICING

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Mr. Heater, Inc. | Kerosene Forced Air Heater
MH125KTR, MH175KTR and MH210KTR
DIAGNOSTIC SAFETY SHUTDOWN AND TROUBLE SHOOTING
LED UNIT OPERATION TROUBLE SHOOTING
MH50KR and MH75KTR
SYMPTOM TROUBLE SHOOTING

Mr. Heater, Inc.| Kerosene Forced Air Heater 7
The parts lists and wiring diagram show the heater as it was
WIRING DIAGRAM
MH50KR/MH75KTR
MH125KTR/MH175KTR/MH210KTR
setting, have it checked.
ON/OFF SWITCH
AC OUTLET
18AWG GRN
18AWG ORG
18AWG ORG
2
3
1
IGNITION TRANSFORMER
MOTOR
HI-LIMIT
SWITCH
CORD SET
MOTOR CAPACITOR
CIRCUIT BOARD
18AWG YELL
18AWG YELL
18AWG RED
18AWG RED
18AWG WHT
18AWG BLK
18AWG GRN
18AWG PURPLE
18AWG PINK
18AWG PINK
123456
18AWG PURPLE
THERMOSTAT
18AWG BLUE
78
ELECTR0DE
18AWG GRN
17AWG BLK
910
RED LED
11 12
18AWG BLUE
17AWG BLK
24AWG BLK
24AWG RED
18AWG BLK
18AWG WHT
CAD CELL
18AWG BLUE THERMOSTAT
18AWG PURPLE
COM1
I2
I1M2
M1
L
N
18AWG PURPLE
18AWG GRN
18AWG BLK
18AWG WHT 18AWG YELL
18AWG YELL
FLAME CONTROL SCHEMATIC
(connections may not be in same
position on circuit board)
CORD SET
CAD CELL
HI-LIMIT
SWITCH
18AWG GRN
AC OUTLET
ON/OFF SWITCH
125KT,175KT,
210KT ONLY
75KT,125KT,175KT,210KT ONLY
18AWG PINK
18AWG PINK MOTOR CAPACITOR
MOTOR
18AWG ORG
18AWG ORG
18AWG RED
18AWG RED IGNITION TRANSFORMER
17AWG BLK
18AWG GRN
ELECTR0DE
17AWG BLK
18AWG BLK
18AWG WHT
H2
H1

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Mr. Heater, Inc. | Kerosene Forced Air Heater
Ref. Item # Item # Item # Description
MH125KTR MH175KTR MH210KTR
1 22169 22169 22169 Wheel Assembly, 10”
2 27127 27129 27129 Upper Handle w/Spring Clips
* 27121 27121 27121 Lower Handle, Right
3 22173 22173 22173 Lower Handle, Left
* 27105 27105 27105 Leg Support, Right
4 27105 27105 27105 Leg Support, Left
5 27104 27132 27133 Support Leg
6 27128 27130 27131 Front Handle
7 28749 28749 28749 Large Retainer Washer
8 28750 28750 28750 Cotter Pin
9 28751 28751 28751 Hub Cap
10 28754 28754 28754 Extension Cord Caddy
11 21897 21897 21897 Wheel Spacer
12 22168 22184 22184 Axel
* 28787 28787 28787 Hardware Package
PARTS LIST
PARTS LIST
Ref. Item # Item # Item # Item # Item # Description
MH50KR MH75KTR MH125KTR MH175KTR MH210KTR
Ref. Item # Item # Item # Item # Item # Description
MH50KR MH75KTR MH125KTR MH175KTR MH210KTR
1 21036 21036 21036 21036 21036 Power Cord
2 26958 26970 26974 27112 27112 Fuel Tank Assembly
3 **** 21883 21884 21885 21886 RadiationShield Ass’y
4 26960 26967 26975 26975 26975 Power Pac Ass’y
5 21686 24343 24346 24346 24346 Fuel Tube
6 21835 21836 21837 21837 21837 Grille Assembly
7 24011 24011 24011 24011 24011 Oil cad cell Bracket
8 28779 28779 28792 28793 28793 Fuel Filter
9 23449 23449 23449 23449 23449 Motor Cord Sleeve
10 26957 27144 26973 27111 27111 Bottom Shell
11 26956 27143 26972 27110 27110 Top Shell, Burner
12 26955 26966 26971 27109 27109 Top Shell, Insp. Cover
13 21864 21864 21865 21865 21865 Motor Mounting Brkt
14 **** 28788 28735 28735 28735 Start Capacitor
15 23725 23725 24345 24345 24345 Air Tube
16 26225 26225 26225 26225 26225 Snap Bushing
17 26962 21794 26901 22105 22105 High Limit Control
18 F226831 F226831 F226831 F226831 F226831 Kit, Rotor
- Air Pump Rotor w/Vanes
- Nylon Air Pump Insert
19 **** 26898 26898 26898 26898 Receptacle, 110V
20 **** 22104 22104 22104 22104 AC Receptacle Cover
21 26833 26833 26833 26833 26833 Air Pump Cylinder
22 21810 21810 21810 21810 21810 Outlet Housing
23 21812 21812 21812 21812 21812 Inlet Housing
24 **** **** 22257 22257 22257 Burner Head Ass’y
25 F221887 F221887 F221887 F221887 F221887 Kit, Filter
26 21814 21814 21814 21814 21814 Outlet Filter
27 21815 21815 21815 21815 21815 Inlet Filter
28 F266842 F266842 F266842 F266842 F266842 Kit, Pump Adjustment
- Nylon Pipe Plug
- Pump Adj. Screw Cap
- Ball,. Pressure adj.
- Spring, Pressure adj.
29 21866 21866 21867 21867 21867 Flame Control Ass’y
30 21816 21816 21816 21816 21816 Flame Control Bracket
31 F226865 F226865 F226865 F226865 F226865 cad cell Flame Sensor
32 21882 21868 21869 21870 21871 Comb.Chamber Cyl.Ass’y
33 26959 26959 26959 26959 26959 Fuel Cap
34 26910 26910 26910 26910 26910 Fuel Cap Gasket
35 27339 21817 21818 21818 21818 Motor
36 27790 27790 28739 28739 28739 Nozzle Adapter
37 27421 28740 26885 26866 26866 Fan
38 22142 22142 22142 22142 22142 Igniter Assembly
39
F227416 F221878 F221879 F221889 F221891
Fuel Air Aspir. Nozzle
40 26223 26223 26223 26223 26223 Strain Relief Bushing
41
F221857 F221857 F221857 F221857 F221857
Electrode Assembly
42 21820 21820 21820 21820 21820 Electrode Insulated Cover
43 21821 21821 21821 21821 21821 Hose Barb Adapter
44 **** 21822 21822 21822 21822 Thermostat Knob
45 **** 21734 21734 21734 21734 Thermostat Assembly
46 28785 28785 28785 28785 28785 ON/OFF Switch
47 **** 28791 28778 22185 22185 Fuel Gauge
48 26964 21888 27107 27116 27116 Control Panel
49 26965 26968 27108 27117 27117 Control Panel Back
50 28786 28786 28786 28786 28786 Pressure Gauge, Round
51 27925 27095 **** **** **** Handle
52 21813 21813 21813 21813 21813 Gasket, Outlet Filter
* 24171 24171 **** **** **** Nozzle mtg. plate
* 26227 26227 26227 Snap Bushing
* 27429 27429 27429 27429 27429 Nozzle Ext. Retaining Ring
* 28745 28745 **** **** **** Fuel Line Bushing
* **** 22146 22146 22146 22146 Bracket Thermostat Mtg.
* **** 26070 26070 26070 26070 Clamp Loop
* Not shown in the drawing
1
2
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6
5
9
7
8
10
11
12
27095
26956
26955

Mr. Heater, Inc.| Kerosene Forced Air Heater 9
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Kerosene Forced Air Heater • Model MH50KR, MH75KTR, MH125KTR, MH175KTR, MH210KTR
51
52

MH50KR, MH75KTR,
MH125KTR, MH175TR,
MH210KTR
OPERATING INSTRUCTIONS
AND OWNER’S MANUAL
WARNING:
PARTS ORDERING INFORMATION:
PURCHASING:
FOR INFORMATION REGARDING SERVICE
LIMITED WARRANTY
UL733, CSA B140.8, CSA B140.9.3